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1 /* png.h - header file for PNG reference library |
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2 * |
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3 * libpng version 1.2.32 - September 18, 2008 |
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4 * Copyright (c) 1998-2008 Glenn Randers-Pehrson |
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5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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7 * |
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8 * Authors and maintainers: |
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9 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat |
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10 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger |
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11 * libpng versions 0.97, January 1998, through 1.2.32 - September 18, 2008: Glenn |
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12 * See also "Contributing Authors", below. |
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13 * |
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14 * Note about libpng version numbers: |
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15 * |
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16 * Due to various miscommunications, unforeseen code incompatibilities |
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17 * and occasional factors outside the authors' control, version numbering |
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18 * on the library has not always been consistent and straightforward. |
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19 * The following table summarizes matters since version 0.89c, which was |
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20 * the first widely used release: |
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21 * |
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22 * source png.h png.h shared-lib |
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23 * version string int version |
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24 * ------- ------ ----- ---------- |
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25 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 |
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26 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] |
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27 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] |
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28 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] |
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29 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] |
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30 * 0.97c 0.97 97 2.0.97 |
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31 * 0.98 0.98 98 2.0.98 |
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32 * 0.99 0.99 98 2.0.99 |
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33 * 0.99a-m 0.99 99 2.0.99 |
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34 * 1.00 1.00 100 2.1.0 [100 should be 10000] |
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35 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] |
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36 * 1.0.1 png.h string is 10001 2.1.0 |
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37 * 1.0.1a-e identical to the 10002 from here on, the shared library |
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38 * 1.0.2 source version) 10002 is 2.V where V is the source code |
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39 * 1.0.2a-b 10003 version, except as noted. |
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40 * 1.0.3 10003 |
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41 * 1.0.3a-d 10004 |
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42 * 1.0.4 10004 |
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43 * 1.0.4a-f 10005 |
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44 * 1.0.5 (+ 2 patches) 10005 |
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45 * 1.0.5a-d 10006 |
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46 * 1.0.5e-r 10100 (not source compatible) |
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47 * 1.0.5s-v 10006 (not binary compatible) |
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48 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) |
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49 * 1.0.6d-f 10007 (still binary incompatible) |
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50 * 1.0.6g 10007 |
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51 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) |
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52 * 1.0.6i 10007 10.6i |
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53 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) |
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54 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) |
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55 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) |
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56 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) |
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57 * 1.0.7 1 10007 (still compatible) |
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58 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 |
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59 * 1.0.8rc1 1 10008 2.1.0.8rc1 |
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60 * 1.0.8 1 10008 2.1.0.8 |
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61 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 |
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62 * 1.0.9rc1 1 10009 2.1.0.9rc1 |
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63 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 |
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64 * 1.0.9rc2 1 10009 2.1.0.9rc2 |
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65 * 1.0.9 1 10009 2.1.0.9 |
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66 * 1.0.10beta1 1 10010 2.1.0.10beta1 |
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67 * 1.0.10rc1 1 10010 2.1.0.10rc1 |
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68 * 1.0.10 1 10010 2.1.0.10 |
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69 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 |
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70 * 1.0.11rc1 1 10011 2.1.0.11rc1 |
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71 * 1.0.11 1 10011 2.1.0.11 |
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72 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 |
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73 * 1.0.12rc1 2 10012 2.1.0.12rc1 |
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74 * 1.0.12 2 10012 2.1.0.12 |
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75 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) |
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76 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 |
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77 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 |
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78 * 1.2.0rc1 3 10200 3.1.2.0rc1 |
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79 * 1.2.0 3 10200 3.1.2.0 |
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80 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 |
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81 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 |
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82 * 1.2.1 3 10201 3.1.2.1 |
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83 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 |
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84 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 |
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85 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 |
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86 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 |
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87 * 1.0.13 10 10013 10.so.0.1.0.13 |
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88 * 1.2.2 12 10202 12.so.0.1.2.2 |
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89 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 |
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90 * 1.2.3 12 10203 12.so.0.1.2.3 |
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91 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 |
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92 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 |
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93 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 |
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94 * 1.0.14 10 10014 10.so.0.1.0.14 |
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95 * 1.2.4 13 10204 12.so.0.1.2.4 |
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96 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 |
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97 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 |
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98 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 |
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99 * 1.0.15 10 10015 10.so.0.1.0.15 |
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100 * 1.2.5 13 10205 12.so.0.1.2.5 |
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101 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 |
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102 * 1.0.16 10 10016 10.so.0.1.0.16 |
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103 * 1.2.6 13 10206 12.so.0.1.2.6 |
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104 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 |
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105 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1 |
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106 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 |
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107 * 1.0.17 10 10017 10.so.0.1.0.17 |
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108 * 1.2.7 13 10207 12.so.0.1.2.7 |
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109 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 |
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110 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5 |
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111 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 |
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112 * 1.0.18 10 10018 10.so.0.1.0.18 |
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113 * 1.2.8 13 10208 12.so.0.1.2.8 |
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114 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 |
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115 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] |
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116 * 1.2.9rc1 13 10209 12.so.0.9[.0] |
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117 * 1.2.9 13 10209 12.so.0.9[.0] |
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118 * 1.2.10beta1-8 13 10210 12.so.0.10[.0] |
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119 * 1.2.10rc1-3 13 10210 12.so.0.10[.0] |
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120 * 1.2.10 13 10210 12.so.0.10[.0] |
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121 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] |
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122 * 1.0.19rc1-5 10 10019 10.so.0.19[.0] |
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123 * 1.2.11rc1-5 13 10211 12.so.0.11[.0] |
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124 * 1.0.19 10 10019 10.so.0.19[.0] |
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125 * 1.2.11 13 10211 12.so.0.11[.0] |
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126 * 1.0.20 10 10020 10.so.0.20[.0] |
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127 * 1.2.12 13 10212 12.so.0.12[.0] |
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128 * 1.2.13beta1 13 10213 12.so.0.13[.0] |
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129 * 1.0.21 10 10021 10.so.0.21[.0] |
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130 * 1.2.13 13 10213 12.so.0.13[.0] |
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131 * 1.2.14beta1-2 13 10214 12.so.0.14[.0] |
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132 * 1.0.22rc1 10 10022 10.so.0.22[.0] |
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133 * 1.2.14rc1 13 10214 12.so.0.14[.0] |
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134 * 1.0.22 10 10022 10.so.0.22[.0] |
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135 * 1.2.14 13 10214 12.so.0.14[.0] |
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136 * 1.2.15beta1-6 13 10215 12.so.0.15[.0] |
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137 * 1.0.23rc1-5 10 10023 10.so.0.23[.0] |
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138 * 1.2.15rc1-5 13 10215 12.so.0.15[.0] |
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139 * 1.0.23 10 10023 10.so.0.23[.0] |
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140 * 1.2.15 13 10215 12.so.0.15[.0] |
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141 * 1.2.16beta1-2 13 10216 12.so.0.16[.0] |
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142 * 1.2.16rc1 13 10216 12.so.0.16[.0] |
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143 * 1.0.24 10 10024 10.so.0.24[.0] |
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144 * 1.2.16 13 10216 12.so.0.16[.0] |
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145 * 1.2.17beta1-2 13 10217 12.so.0.17[.0] |
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146 * 1.0.25rc1 10 10025 10.so.0.25[.0] |
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147 * 1.2.17rc1-3 13 10217 12.so.0.17[.0] |
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148 * 1.0.25 10 10025 10.so.0.25[.0] |
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149 * 1.2.17 13 10217 12.so.0.17[.0] |
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150 * 1.0.26 10 10026 10.so.0.26[.0] |
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151 * 1.2.18 13 10218 12.so.0.18[.0] |
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152 * 1.2.19beta1-31 13 10219 12.so.0.19[.0] |
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153 * 1.0.27rc1-6 10 10027 10.so.0.27[.0] |
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154 * 1.2.19rc1-6 13 10219 12.so.0.19[.0] |
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155 * 1.0.27 10 10027 10.so.0.27[.0] |
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156 * 1.2.19 13 10219 12.so.0.19[.0] |
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157 * 1.2.20beta01-04 13 10220 12.so.0.20[.0] |
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158 * 1.0.28rc1-6 10 10028 10.so.0.28[.0] |
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159 * 1.2.20rc1-6 13 10220 12.so.0.20[.0] |
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160 * 1.0.28 10 10028 10.so.0.28[.0] |
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161 * 1.2.20 13 10220 12.so.0.20[.0] |
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162 * 1.2.21beta1-2 13 10221 12.so.0.21[.0] |
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163 * 1.2.21rc1-3 13 10221 12.so.0.21[.0] |
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164 * 1.0.29 10 10029 10.so.0.29[.0] |
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165 * 1.2.21 13 10221 12.so.0.21[.0] |
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166 * 1.2.22beta1-4 13 10222 12.so.0.22[.0] |
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167 * 1.0.30rc1 10 10030 10.so.0.30[.0] |
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168 * 1.2.22rc1 13 10222 12.so.0.22[.0] |
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169 * 1.0.30 10 10030 10.so.0.30[.0] |
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170 * 1.2.22 13 10222 12.so.0.22[.0] |
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171 * 1.2.23beta01-05 13 10223 12.so.0.23[.0] |
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172 * 1.2.23rc01 13 10223 12.so.0.23[.0] |
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173 * 1.2.23 13 10223 12.so.0.23[.0] |
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174 * 1.2.24beta01-02 13 10224 12.so.0.24[.0] |
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175 * 1.2.24rc01 13 10224 12.so.0.24[.0] |
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176 * 1.2.24 13 10224 12.so.0.24[.0] |
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177 * 1.2.25beta01-06 13 10225 12.so.0.25[.0] |
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178 * 1.2.25rc01-02 13 10225 12.so.0.25[.0] |
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179 * 1.0.31 10 10031 10.so.0.31[.0] |
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180 * 1.2.25 13 10225 12.so.0.25[.0] |
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181 * 1.2.26beta01-06 13 10226 12.so.0.26[.0] |
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182 * 1.2.26rc01 13 10226 12.so.0.26[.0] |
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183 * 1.2.26 13 10226 12.so.0.26[.0] |
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184 * 1.0.32 10 10032 10.so.0.32[.0] |
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185 * 1.2.27beta01-06 13 10227 12.so.0.27[.0] |
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186 * 1.2.27rc01 13 10227 12.so.0.27[.0] |
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187 * 1.0.33 10 10033 10.so.0.33[.0] |
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188 * 1.2.27 13 10227 12.so.0.27[.0] |
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189 * 1.0.34 10 10034 10.so.0.34[.0] |
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190 * 1.2.28 13 10228 12.so.0.28[.0] |
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191 * 1.2.29beta01-03 13 10229 12.so.0.29[.0] |
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192 * 1.2.29rc01 13 10229 12.so.0.29[.0] |
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193 * 1.0.35 10 10035 10.so.0.35[.0] |
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194 * 1.2.29 13 10229 12.so.0.29[.0] |
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195 * 1.0.37 10 10037 10.so.0.37[.0] |
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196 * 1.2.30beta01-04 13 10230 12.so.0.30[.0] |
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197 * 1.0.38rc01-08 10 10038 10.so.0.38[.0] |
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198 * 1.2.30rc01-08 13 10230 12.so.0.30[.0] |
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199 * 1.0.38 10 10038 10.so.0.38[.0] |
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200 * 1.2.30 13 10230 12.so.0.30[.0] |
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201 * 1.0.39rc01-03 10 10039 10.so.0.39[.0] |
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202 * 1.2.31rc01-03 13 10231 12.so.0.31[.0] |
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203 * 1.0.39 10 10039 10.so.0.39[.0] |
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204 * 1.2.31 13 10231 12.so.0.31[.0] |
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205 * 1.2.32beta01-02 13 10232 12.so.0.32[.0] |
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206 * 1.0.40rc01 10 10040 10.so.0.40[.0] |
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207 * 1.2.32rc01 13 10232 12.so.0.32[.0] |
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208 * 1.0.40 10 10040 10.so.0.40[.0] |
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209 * 1.2.32 13 10232 12.so.0.32[.0] |
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210 * |
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211 * Henceforth the source version will match the shared-library major |
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212 * and minor numbers; the shared-library major version number will be |
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213 * used for changes in backward compatibility, as it is intended. The |
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214 * PNG_LIBPNG_VER macro, which is not used within libpng but is available |
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215 * for applications, is an unsigned integer of the form xyyzz corresponding |
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216 * to the source version x.y.z (leading zeros in y and z). Beta versions |
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217 * were given the previous public release number plus a letter, until |
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218 * version 1.0.6j; from then on they were given the upcoming public |
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219 * release number plus "betaNN" or "rcNN". |
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220 * |
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221 * Binary incompatibility exists only when applications make direct access |
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222 * to the info_ptr or png_ptr members through png.h, and the compiled |
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223 * application is loaded with a different version of the library. |
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224 * |
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225 * DLLNUM will change each time there are forward or backward changes |
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226 * in binary compatibility (e.g., when a new feature is added). |
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227 * |
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228 * See libpng.txt or libpng.3 for more information. The PNG specification |
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229 * is available as a W3C Recommendation and as an ISO Specification, |
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230 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ |
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231 */ |
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232 |
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233 /* |
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234 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: |
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235 * |
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236 * If you modify libpng you may insert additional notices immediately following |
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237 * this sentence. |
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238 * |
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239 * libpng versions 1.2.6, August 15, 2004, through 1.2.32, September 18, 2008, are |
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240 * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are |
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241 * distributed according to the same disclaimer and license as libpng-1.2.5 |
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242 * with the following individual added to the list of Contributing Authors: |
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243 * |
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244 * Cosmin Truta |
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245 * |
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246 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are |
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247 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are |
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248 * distributed according to the same disclaimer and license as libpng-1.0.6 |
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249 * with the following individuals added to the list of Contributing Authors: |
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250 * |
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251 * Simon-Pierre Cadieux |
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252 * Eric S. Raymond |
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253 * Gilles Vollant |
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254 * |
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255 * and with the following additions to the disclaimer: |
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256 * |
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257 * There is no warranty against interference with your enjoyment of the |
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258 * library or against infringement. There is no warranty that our |
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259 * efforts or the library will fulfill any of your particular purposes |
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260 * or needs. This library is provided with all faults, and the entire |
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261 * risk of satisfactory quality, performance, accuracy, and effort is with |
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262 * the user. |
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263 * |
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264 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are |
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265 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are |
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266 * distributed according to the same disclaimer and license as libpng-0.96, |
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267 * with the following individuals added to the list of Contributing Authors: |
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268 * |
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269 * Tom Lane |
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270 * Glenn Randers-Pehrson |
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271 * Willem van Schaik |
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272 * |
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273 * libpng versions 0.89, June 1996, through 0.96, May 1997, are |
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274 * Copyright (c) 1996, 1997 Andreas Dilger |
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275 * Distributed according to the same disclaimer and license as libpng-0.88, |
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276 * with the following individuals added to the list of Contributing Authors: |
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277 * |
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278 * John Bowler |
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279 * Kevin Bracey |
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280 * Sam Bushell |
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281 * Magnus Holmgren |
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282 * Greg Roelofs |
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283 * Tom Tanner |
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284 * |
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285 * libpng versions 0.5, May 1995, through 0.88, January 1996, are |
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286 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
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287 * |
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288 * For the purposes of this copyright and license, "Contributing Authors" |
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289 * is defined as the following set of individuals: |
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290 * |
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291 * Andreas Dilger |
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292 * Dave Martindale |
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293 * Guy Eric Schalnat |
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294 * Paul Schmidt |
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295 * Tim Wegner |
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296 * |
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297 * The PNG Reference Library is supplied "AS IS". The Contributing Authors |
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298 * and Group 42, Inc. disclaim all warranties, expressed or implied, |
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299 * including, without limitation, the warranties of merchantability and of |
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300 * fitness for any purpose. The Contributing Authors and Group 42, Inc. |
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301 * assume no liability for direct, indirect, incidental, special, exemplary, |
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302 * or consequential damages, which may result from the use of the PNG |
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303 * Reference Library, even if advised of the possibility of such damage. |
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304 * |
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305 * Permission is hereby granted to use, copy, modify, and distribute this |
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306 * source code, or portions hereof, for any purpose, without fee, subject |
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307 * to the following restrictions: |
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308 * |
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309 * 1. The origin of this source code must not be misrepresented. |
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310 * |
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311 * 2. Altered versions must be plainly marked as such and |
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312 * must not be misrepresented as being the original source. |
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313 * |
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314 * 3. This Copyright notice may not be removed or altered from |
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315 * any source or altered source distribution. |
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316 * |
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317 * The Contributing Authors and Group 42, Inc. specifically permit, without |
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318 * fee, and encourage the use of this source code as a component to |
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319 * supporting the PNG file format in commercial products. If you use this |
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320 * source code in a product, acknowledgment is not required but would be |
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321 * appreciated. |
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322 */ |
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323 |
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324 /* |
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325 * A "png_get_copyright" function is available, for convenient use in "about" |
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326 * boxes and the like: |
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327 * |
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328 * printf("%s",png_get_copyright(NULL)); |
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329 * |
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330 * Also, the PNG logo (in PNG format, of course) is supplied in the |
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331 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). |
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332 */ |
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333 |
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334 /* |
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335 * Libpng is OSI Certified Open Source Software. OSI Certified is a |
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336 * certification mark of the Open Source Initiative. |
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337 */ |
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338 |
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339 /* |
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340 * The contributing authors would like to thank all those who helped |
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341 * with testing, bug fixes, and patience. This wouldn't have been |
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342 * possible without all of you. |
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343 * |
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344 * Thanks to Frank J. T. Wojcik for helping with the documentation. |
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345 */ |
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346 |
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347 /* |
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348 * Y2K compliance in libpng: |
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349 * ========================= |
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350 * |
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351 * September 18, 2008 |
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352 * |
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353 * Since the PNG Development group is an ad-hoc body, we can't make |
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354 * an official declaration. |
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355 * |
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356 * This is your unofficial assurance that libpng from version 0.71 and |
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357 * upward through 1.2.32 are Y2K compliant. It is my belief that earlier |
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358 * versions were also Y2K compliant. |
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359 * |
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360 * Libpng only has three year fields. One is a 2-byte unsigned integer |
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361 * that will hold years up to 65535. The other two hold the date in text |
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362 * format, and will hold years up to 9999. |
|
363 * |
|
364 * The integer is |
|
365 * "png_uint_16 year" in png_time_struct. |
|
366 * |
|
367 * The strings are |
|
368 * "png_charp time_buffer" in png_struct and |
|
369 * "near_time_buffer", which is a local character string in png.c. |
|
370 * |
|
371 * There are seven time-related functions: |
|
372 * png.c: png_convert_to_rfc_1123() in png.c |
|
373 * (formerly png_convert_to_rfc_1152() in error) |
|
374 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
|
375 * png_convert_from_time_t() in pngwrite.c |
|
376 * png_get_tIME() in pngget.c |
|
377 * png_handle_tIME() in pngrutil.c, called in pngread.c |
|
378 * png_set_tIME() in pngset.c |
|
379 * png_write_tIME() in pngwutil.c, called in pngwrite.c |
|
380 * |
|
381 * All handle dates properly in a Y2K environment. The |
|
382 * png_convert_from_time_t() function calls gmtime() to convert from system |
|
383 * clock time, which returns (year - 1900), which we properly convert to |
|
384 * the full 4-digit year. There is a possibility that applications using |
|
385 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() |
|
386 * function, or that they are incorrectly passing only a 2-digit year |
|
387 * instead of "year - 1900" into the png_convert_from_struct_tm() function, |
|
388 * but this is not under our control. The libpng documentation has always |
|
389 * stated that it works with 4-digit years, and the APIs have been |
|
390 * documented as such. |
|
391 * |
|
392 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
|
393 * integer to hold the year, and can hold years as large as 65535. |
|
394 * |
|
395 * zlib, upon which libpng depends, is also Y2K compliant. It contains |
|
396 * no date-related code. |
|
397 * |
|
398 * Glenn Randers-Pehrson |
|
399 * libpng maintainer |
|
400 * PNG Development Group |
|
401 */ |
|
402 |
|
403 #ifndef PNG_H |
|
404 #define PNG_H |
|
405 |
|
406 /* This is not the place to learn how to use libpng. The file libpng.txt |
|
407 * describes how to use libpng, and the file example.c summarizes it |
|
408 * with some code on which to build. This file is useful for looking |
|
409 * at the actual function definitions and structure components. |
|
410 */ |
|
411 |
|
412 /* Version information for png.h - this should match the version in png.c */ |
|
413 #define PNG_LIBPNG_VER_STRING "1.2.32" |
|
414 #define PNG_HEADER_VERSION_STRING \ |
|
415 " libpng version 1.2.32 - September 18, 2008\n" |
|
416 |
|
417 #define PNG_LIBPNG_VER_SONUM 0 |
|
418 #define PNG_LIBPNG_VER_DLLNUM 13 |
|
419 |
|
420 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
|
421 #define PNG_LIBPNG_VER_MAJOR 1 |
|
422 #define PNG_LIBPNG_VER_MINOR 2 |
|
423 #define PNG_LIBPNG_VER_RELEASE 32 |
|
424 /* This should match the numeric part of the final component of |
|
425 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ |
|
426 |
|
427 #define PNG_LIBPNG_VER_BUILD 0 |
|
428 |
|
429 /* Release Status */ |
|
430 #define PNG_LIBPNG_BUILD_ALPHA 1 |
|
431 #define PNG_LIBPNG_BUILD_BETA 2 |
|
432 #define PNG_LIBPNG_BUILD_RC 3 |
|
433 #define PNG_LIBPNG_BUILD_STABLE 4 |
|
434 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 |
|
435 |
|
436 /* Release-Specific Flags */ |
|
437 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with |
|
438 PNG_LIBPNG_BUILD_STABLE only */ |
|
439 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with |
|
440 PNG_LIBPNG_BUILD_SPECIAL */ |
|
441 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with |
|
442 PNG_LIBPNG_BUILD_PRIVATE */ |
|
443 |
|
444 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE |
|
445 |
|
446 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
|
447 * We must not include leading zeros. |
|
448 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
|
449 * version 1.0.0 was mis-numbered 100 instead of 10000). From |
|
450 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ |
|
451 #define PNG_LIBPNG_VER 10232 /* 1.2.32 */ |
|
452 |
|
453 #ifndef PNG_VERSION_INFO_ONLY |
|
454 /* include the compression library's header */ |
|
455 #include "zlib.h" |
|
456 #endif |
|
457 |
|
458 /* include all user configurable info, including optional assembler routines */ |
|
459 #include "pngconf.h" |
|
460 |
|
461 /* |
|
462 * Added at libpng-1.2.8 */ |
|
463 /* Ref MSDN: Private as priority over Special |
|
464 * VS_FF_PRIVATEBUILD File *was not* built using standard release |
|
465 * procedures. If this value is given, the StringFileInfo block must |
|
466 * contain a PrivateBuild string. |
|
467 * |
|
468 * VS_FF_SPECIALBUILD File *was* built by the original company using |
|
469 * standard release procedures but is a variation of the standard |
|
470 * file of the same version number. If this value is given, the |
|
471 * StringFileInfo block must contain a SpecialBuild string. |
|
472 */ |
|
473 |
|
474 #if defined(PNG_USER_PRIVATEBUILD) |
|
475 # define PNG_LIBPNG_BUILD_TYPE \ |
|
476 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) |
|
477 #else |
|
478 # if defined(PNG_LIBPNG_SPECIALBUILD) |
|
479 # define PNG_LIBPNG_BUILD_TYPE \ |
|
480 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) |
|
481 # else |
|
482 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) |
|
483 # endif |
|
484 #endif |
|
485 |
|
486 #ifndef PNG_VERSION_INFO_ONLY |
|
487 |
|
488 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
|
489 #ifdef __cplusplus |
|
490 extern "C" { |
|
491 #endif /* __cplusplus */ |
|
492 |
|
493 /* This file is arranged in several sections. The first section contains |
|
494 * structure and type definitions. The second section contains the external |
|
495 * library functions, while the third has the internal library functions, |
|
496 * which applications aren't expected to use directly. |
|
497 */ |
|
498 |
|
499 #ifndef PNG_NO_TYPECAST_NULL |
|
500 #define int_p_NULL (int *)NULL |
|
501 #define png_bytep_NULL (png_bytep)NULL |
|
502 #define png_bytepp_NULL (png_bytepp)NULL |
|
503 #define png_doublep_NULL (png_doublep)NULL |
|
504 #define png_error_ptr_NULL (png_error_ptr)NULL |
|
505 #define png_flush_ptr_NULL (png_flush_ptr)NULL |
|
506 #define png_free_ptr_NULL (png_free_ptr)NULL |
|
507 #define png_infopp_NULL (png_infopp)NULL |
|
508 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL |
|
509 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL |
|
510 #define png_rw_ptr_NULL (png_rw_ptr)NULL |
|
511 #define png_structp_NULL (png_structp)NULL |
|
512 #define png_uint_16p_NULL (png_uint_16p)NULL |
|
513 #define png_voidp_NULL (png_voidp)NULL |
|
514 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL |
|
515 #else |
|
516 #define int_p_NULL NULL |
|
517 #define png_bytep_NULL NULL |
|
518 #define png_bytepp_NULL NULL |
|
519 #define png_doublep_NULL NULL |
|
520 #define png_error_ptr_NULL NULL |
|
521 #define png_flush_ptr_NULL NULL |
|
522 #define png_free_ptr_NULL NULL |
|
523 #define png_infopp_NULL NULL |
|
524 #define png_malloc_ptr_NULL NULL |
|
525 #define png_read_status_ptr_NULL NULL |
|
526 #define png_rw_ptr_NULL NULL |
|
527 #define png_structp_NULL NULL |
|
528 #define png_uint_16p_NULL NULL |
|
529 #define png_voidp_NULL NULL |
|
530 #define png_write_status_ptr_NULL NULL |
|
531 #endif |
|
532 |
|
533 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
|
534 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
|
535 /* Version information for C files, stored in png.c. This had better match |
|
536 * the version above. |
|
537 */ |
|
538 #ifdef PNG_USE_GLOBAL_ARRAYS |
|
539 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; |
|
540 /* need room for 99.99.99beta99z */ |
|
541 #else |
|
542 #define png_libpng_ver png_get_header_ver(NULL) |
|
543 #endif |
|
544 |
|
545 #ifdef PNG_USE_GLOBAL_ARRAYS |
|
546 /* This was removed in version 1.0.5c */ |
|
547 /* Structures to facilitate easy interlacing. See png.c for more details */ |
|
548 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; |
|
549 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; |
|
550 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; |
|
551 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; |
|
552 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; |
|
553 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; |
|
554 /* This isn't currently used. If you need it, see png.c for more details. |
|
555 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; |
|
556 */ |
|
557 #endif |
|
558 |
|
559 #endif /* PNG_NO_EXTERN */ |
|
560 |
|
561 /* Three color definitions. The order of the red, green, and blue, (and the |
|
562 * exact size) is not important, although the size of the fields need to |
|
563 * be png_byte or png_uint_16 (as defined below). |
|
564 */ |
|
565 typedef struct png_color_struct |
|
566 { |
|
567 png_byte red; |
|
568 png_byte green; |
|
569 png_byte blue; |
|
570 } png_color; |
|
571 typedef png_color FAR * png_colorp; |
|
572 typedef png_color FAR * FAR * png_colorpp; |
|
573 |
|
574 typedef struct png_color_16_struct |
|
575 { |
|
576 png_byte index; /* used for palette files */ |
|
577 png_uint_16 red; /* for use in red green blue files */ |
|
578 png_uint_16 green; |
|
579 png_uint_16 blue; |
|
580 png_uint_16 gray; /* for use in grayscale files */ |
|
581 } png_color_16; |
|
582 typedef png_color_16 FAR * png_color_16p; |
|
583 typedef png_color_16 FAR * FAR * png_color_16pp; |
|
584 |
|
585 typedef struct png_color_8_struct |
|
586 { |
|
587 png_byte red; /* for use in red green blue files */ |
|
588 png_byte green; |
|
589 png_byte blue; |
|
590 png_byte gray; /* for use in grayscale files */ |
|
591 png_byte alpha; /* for alpha channel files */ |
|
592 } png_color_8; |
|
593 typedef png_color_8 FAR * png_color_8p; |
|
594 typedef png_color_8 FAR * FAR * png_color_8pp; |
|
595 |
|
596 /* |
|
597 * The following two structures are used for the in-core representation |
|
598 * of sPLT chunks. |
|
599 */ |
|
600 typedef struct png_sPLT_entry_struct |
|
601 { |
|
602 png_uint_16 red; |
|
603 png_uint_16 green; |
|
604 png_uint_16 blue; |
|
605 png_uint_16 alpha; |
|
606 png_uint_16 frequency; |
|
607 } png_sPLT_entry; |
|
608 typedef png_sPLT_entry FAR * png_sPLT_entryp; |
|
609 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; |
|
610 |
|
611 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
|
612 * occupy the LSB of their respective members, and the MSB of each member |
|
613 * is zero-filled. The frequency member always occupies the full 16 bits. |
|
614 */ |
|
615 |
|
616 typedef struct png_sPLT_struct |
|
617 { |
|
618 png_charp name; /* palette name */ |
|
619 png_byte depth; /* depth of palette samples */ |
|
620 png_sPLT_entryp entries; /* palette entries */ |
|
621 png_int_32 nentries; /* number of palette entries */ |
|
622 } png_sPLT_t; |
|
623 typedef png_sPLT_t FAR * png_sPLT_tp; |
|
624 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; |
|
625 |
|
626 #ifdef PNG_TEXT_SUPPORTED |
|
627 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, |
|
628 * and whether that contents is compressed or not. The "key" field |
|
629 * points to a regular zero-terminated C string. The "text", "lang", and |
|
630 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. |
|
631 * However, the * structure returned by png_get_text() will always contain |
|
632 * regular zero-terminated C strings (possibly empty), never NULL pointers, |
|
633 * so they can be safely used in printf() and other string-handling functions. |
|
634 */ |
|
635 typedef struct png_text_struct |
|
636 { |
|
637 int compression; /* compression value: |
|
638 -1: tEXt, none |
|
639 0: zTXt, deflate |
|
640 1: iTXt, none |
|
641 2: iTXt, deflate */ |
|
642 png_charp key; /* keyword, 1-79 character description of "text" */ |
|
643 png_charp text; /* comment, may be an empty string (ie "") |
|
644 or a NULL pointer */ |
|
645 png_size_t text_length; /* length of the text string */ |
|
646 #ifdef PNG_iTXt_SUPPORTED |
|
647 png_size_t itxt_length; /* length of the itxt string */ |
|
648 png_charp lang; /* language code, 0-79 characters |
|
649 or a NULL pointer */ |
|
650 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more |
|
651 chars or a NULL pointer */ |
|
652 #endif |
|
653 } png_text; |
|
654 typedef png_text FAR * png_textp; |
|
655 typedef png_text FAR * FAR * png_textpp; |
|
656 #endif |
|
657 |
|
658 /* Supported compression types for text in PNG files (tEXt, and zTXt). |
|
659 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
|
660 #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
|
661 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
|
662 #define PNG_TEXT_COMPRESSION_NONE -1 |
|
663 #define PNG_TEXT_COMPRESSION_zTXt 0 |
|
664 #define PNG_ITXT_COMPRESSION_NONE 1 |
|
665 #define PNG_ITXT_COMPRESSION_zTXt 2 |
|
666 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
|
667 |
|
668 /* png_time is a way to hold the time in an machine independent way. |
|
669 * Two conversions are provided, both from time_t and struct tm. There |
|
670 * is no portable way to convert to either of these structures, as far |
|
671 * as I know. If you know of a portable way, send it to me. As a side |
|
672 * note - PNG has always been Year 2000 compliant! |
|
673 */ |
|
674 typedef struct png_time_struct |
|
675 { |
|
676 png_uint_16 year; /* full year, as in, 1995 */ |
|
677 png_byte month; /* month of year, 1 - 12 */ |
|
678 png_byte day; /* day of month, 1 - 31 */ |
|
679 png_byte hour; /* hour of day, 0 - 23 */ |
|
680 png_byte minute; /* minute of hour, 0 - 59 */ |
|
681 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
|
682 } png_time; |
|
683 typedef png_time FAR * png_timep; |
|
684 typedef png_time FAR * FAR * png_timepp; |
|
685 |
|
686 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
|
687 /* png_unknown_chunk is a structure to hold queued chunks for which there is |
|
688 * no specific support. The idea is that we can use this to queue |
|
689 * up private chunks for output even though the library doesn't actually |
|
690 * know about their semantics. |
|
691 */ |
|
692 #define PNG_CHUNK_NAME_LENGTH 5 |
|
693 typedef struct png_unknown_chunk_t |
|
694 { |
|
695 png_byte name[PNG_CHUNK_NAME_LENGTH]; |
|
696 png_byte *data; |
|
697 png_size_t size; |
|
698 |
|
699 /* libpng-using applications should NOT directly modify this byte. */ |
|
700 png_byte location; /* mode of operation at read time */ |
|
701 } |
|
702 png_unknown_chunk; |
|
703 typedef png_unknown_chunk FAR * png_unknown_chunkp; |
|
704 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; |
|
705 #endif |
|
706 |
|
707 /* png_info is a structure that holds the information in a PNG file so |
|
708 * that the application can find out the characteristics of the image. |
|
709 * If you are reading the file, this structure will tell you what is |
|
710 * in the PNG file. If you are writing the file, fill in the information |
|
711 * you want to put into the PNG file, then call png_write_info(). |
|
712 * The names chosen should be very close to the PNG specification, so |
|
713 * consult that document for information about the meaning of each field. |
|
714 * |
|
715 * With libpng < 0.95, it was only possible to directly set and read the |
|
716 * the values in the png_info_struct, which meant that the contents and |
|
717 * order of the values had to remain fixed. With libpng 0.95 and later, |
|
718 * however, there are now functions that abstract the contents of |
|
719 * png_info_struct from the application, so this makes it easier to use |
|
720 * libpng with dynamic libraries, and even makes it possible to use |
|
721 * libraries that don't have all of the libpng ancillary chunk-handing |
|
722 * functionality. |
|
723 * |
|
724 * In any case, the order of the parameters in png_info_struct should NOT |
|
725 * be changed for as long as possible to keep compatibility with applications |
|
726 * that use the old direct-access method with png_info_struct. |
|
727 * |
|
728 * The following members may have allocated storage attached that should be |
|
729 * cleaned up before the structure is discarded: palette, trans, text, |
|
730 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, |
|
731 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these |
|
732 * are automatically freed when the info structure is deallocated, if they were |
|
733 * allocated internally by libpng. This behavior can be changed by means |
|
734 * of the png_data_freer() function. |
|
735 * |
|
736 * More allocation details: all the chunk-reading functions that |
|
737 * change these members go through the corresponding png_set_* |
|
738 * functions. A function to clear these members is available: see |
|
739 * png_free_data(). The png_set_* functions do not depend on being |
|
740 * able to point info structure members to any of the storage they are |
|
741 * passed (they make their own copies), EXCEPT that the png_set_text |
|
742 * functions use the same storage passed to them in the text_ptr or |
|
743 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns |
|
744 * functions do not make their own copies. |
|
745 */ |
|
746 typedef struct png_info_struct |
|
747 { |
|
748 /* the following are necessary for every PNG file */ |
|
749 png_uint_32 width; /* width of image in pixels (from IHDR) */ |
|
750 png_uint_32 height; /* height of image in pixels (from IHDR) */ |
|
751 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ |
|
752 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ |
|
753 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ |
|
754 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ |
|
755 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ |
|
756 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ |
|
757 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ |
|
758 /* The following three should have been named *_method not *_type */ |
|
759 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ |
|
760 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ |
|
761 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
|
762 |
|
763 /* The following is informational only on read, and not used on writes. */ |
|
764 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ |
|
765 png_byte pixel_depth; /* number of bits per pixel */ |
|
766 png_byte spare_byte; /* to align the data, and for future use */ |
|
767 png_byte signature[8]; /* magic bytes read by libpng from start of file */ |
|
768 |
|
769 /* The rest of the data is optional. If you are reading, check the |
|
770 * valid field to see if the information in these are valid. If you |
|
771 * are writing, set the valid field to those chunks you want written, |
|
772 * and initialize the appropriate fields below. |
|
773 */ |
|
774 |
|
775 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) |
|
776 /* The gAMA chunk describes the gamma characteristics of the system |
|
777 * on which the image was created, normally in the range [1.0, 2.5]. |
|
778 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. |
|
779 */ |
|
780 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ |
|
781 #endif |
|
782 |
|
783 #if defined(PNG_sRGB_SUPPORTED) |
|
784 /* GR-P, 0.96a */ |
|
785 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ |
|
786 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ |
|
787 #endif |
|
788 |
|
789 #if defined(PNG_TEXT_SUPPORTED) |
|
790 /* The tEXt, and zTXt chunks contain human-readable textual data in |
|
791 * uncompressed, compressed, and optionally compressed forms, respectively. |
|
792 * The data in "text" is an array of pointers to uncompressed, |
|
793 * null-terminated C strings. Each chunk has a keyword that describes the |
|
794 * textual data contained in that chunk. Keywords are not required to be |
|
795 * unique, and the text string may be empty. Any number of text chunks may |
|
796 * be in an image. |
|
797 */ |
|
798 int num_text; /* number of comments read/to write */ |
|
799 int max_text; /* current size of text array */ |
|
800 png_textp text; /* array of comments read/to write */ |
|
801 #endif /* PNG_TEXT_SUPPORTED */ |
|
802 |
|
803 #if defined(PNG_tIME_SUPPORTED) |
|
804 /* The tIME chunk holds the last time the displayed image data was |
|
805 * modified. See the png_time struct for the contents of this struct. |
|
806 */ |
|
807 png_time mod_time; |
|
808 #endif |
|
809 |
|
810 #if defined(PNG_sBIT_SUPPORTED) |
|
811 /* The sBIT chunk specifies the number of significant high-order bits |
|
812 * in the pixel data. Values are in the range [1, bit_depth], and are |
|
813 * only specified for the channels in the pixel data. The contents of |
|
814 * the low-order bits is not specified. Data is valid if |
|
815 * (valid & PNG_INFO_sBIT) is non-zero. |
|
816 */ |
|
817 png_color_8 sig_bit; /* significant bits in color channels */ |
|
818 #endif |
|
819 |
|
820 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ |
|
821 defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
822 /* The tRNS chunk supplies transparency data for paletted images and |
|
823 * other image types that don't need a full alpha channel. There are |
|
824 * "num_trans" transparency values for a paletted image, stored in the |
|
825 * same order as the palette colors, starting from index 0. Values |
|
826 * for the data are in the range [0, 255], ranging from fully transparent |
|
827 * to fully opaque, respectively. For non-paletted images, there is a |
|
828 * single color specified that should be treated as fully transparent. |
|
829 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. |
|
830 */ |
|
831 png_bytep trans; /* transparent values for paletted image */ |
|
832 png_color_16 trans_values; /* transparent color for non-palette image */ |
|
833 #endif |
|
834 |
|
835 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
836 /* The bKGD chunk gives the suggested image background color if the |
|
837 * display program does not have its own background color and the image |
|
838 * is needs to composited onto a background before display. The colors |
|
839 * in "background" are normally in the same color space/depth as the |
|
840 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. |
|
841 */ |
|
842 png_color_16 background; |
|
843 #endif |
|
844 |
|
845 #if defined(PNG_oFFs_SUPPORTED) |
|
846 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards |
|
847 * and downwards from the top-left corner of the display, page, or other |
|
848 * application-specific co-ordinate space. See the PNG_OFFSET_ defines |
|
849 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. |
|
850 */ |
|
851 png_int_32 x_offset; /* x offset on page */ |
|
852 png_int_32 y_offset; /* y offset on page */ |
|
853 png_byte offset_unit_type; /* offset units type */ |
|
854 #endif |
|
855 |
|
856 #if defined(PNG_pHYs_SUPPORTED) |
|
857 /* The pHYs chunk gives the physical pixel density of the image for |
|
858 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ |
|
859 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. |
|
860 */ |
|
861 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ |
|
862 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ |
|
863 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ |
|
864 #endif |
|
865 |
|
866 #if defined(PNG_hIST_SUPPORTED) |
|
867 /* The hIST chunk contains the relative frequency or importance of the |
|
868 * various palette entries, so that a viewer can intelligently select a |
|
869 * reduced-color palette, if required. Data is an array of "num_palette" |
|
870 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) |
|
871 * is non-zero. |
|
872 */ |
|
873 png_uint_16p hist; |
|
874 #endif |
|
875 |
|
876 #ifdef PNG_cHRM_SUPPORTED |
|
877 /* The cHRM chunk describes the CIE color characteristics of the monitor |
|
878 * on which the PNG was created. This data allows the viewer to do gamut |
|
879 * mapping of the input image to ensure that the viewer sees the same |
|
880 * colors in the image as the creator. Values are in the range |
|
881 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. |
|
882 */ |
|
883 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
884 float x_white; |
|
885 float y_white; |
|
886 float x_red; |
|
887 float y_red; |
|
888 float x_green; |
|
889 float y_green; |
|
890 float x_blue; |
|
891 float y_blue; |
|
892 #endif |
|
893 #endif |
|
894 |
|
895 #if defined(PNG_pCAL_SUPPORTED) |
|
896 /* The pCAL chunk describes a transformation between the stored pixel |
|
897 * values and original physical data values used to create the image. |
|
898 * The integer range [0, 2^bit_depth - 1] maps to the floating-point |
|
899 * range given by [pcal_X0, pcal_X1], and are further transformed by a |
|
900 * (possibly non-linear) transformation function given by "pcal_type" |
|
901 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ |
|
902 * defines below, and the PNG-Group's PNG extensions document for a |
|
903 * complete description of the transformations and how they should be |
|
904 * implemented, and for a description of the ASCII parameter strings. |
|
905 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. |
|
906 */ |
|
907 png_charp pcal_purpose; /* pCAL chunk description string */ |
|
908 png_int_32 pcal_X0; /* minimum value */ |
|
909 png_int_32 pcal_X1; /* maximum value */ |
|
910 png_charp pcal_units; /* Latin-1 string giving physical units */ |
|
911 png_charpp pcal_params; /* ASCII strings containing parameter values */ |
|
912 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ |
|
913 png_byte pcal_nparams; /* number of parameters given in pcal_params */ |
|
914 #endif |
|
915 |
|
916 /* New members added in libpng-1.0.6 */ |
|
917 #ifdef PNG_FREE_ME_SUPPORTED |
|
918 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
|
919 #endif |
|
920 |
|
921 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
|
922 /* storage for unknown chunks that the library doesn't recognize. */ |
|
923 png_unknown_chunkp unknown_chunks; |
|
924 png_size_t unknown_chunks_num; |
|
925 #endif |
|
926 |
|
927 #if defined(PNG_iCCP_SUPPORTED) |
|
928 /* iCCP chunk data. */ |
|
929 png_charp iccp_name; /* profile name */ |
|
930 png_charp iccp_profile; /* International Color Consortium profile data */ |
|
931 /* Note to maintainer: should be png_bytep */ |
|
932 png_uint_32 iccp_proflen; /* ICC profile data length */ |
|
933 png_byte iccp_compression; /* Always zero */ |
|
934 #endif |
|
935 |
|
936 #if defined(PNG_sPLT_SUPPORTED) |
|
937 /* data on sPLT chunks (there may be more than one). */ |
|
938 png_sPLT_tp splt_palettes; |
|
939 png_uint_32 splt_palettes_num; |
|
940 #endif |
|
941 |
|
942 #if defined(PNG_sCAL_SUPPORTED) |
|
943 /* The sCAL chunk describes the actual physical dimensions of the |
|
944 * subject matter of the graphic. The chunk contains a unit specification |
|
945 * a byte value, and two ASCII strings representing floating-point |
|
946 * values. The values are width and height corresponsing to one pixel |
|
947 * in the image. This external representation is converted to double |
|
948 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. |
|
949 */ |
|
950 png_byte scal_unit; /* unit of physical scale */ |
|
951 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
952 double scal_pixel_width; /* width of one pixel */ |
|
953 double scal_pixel_height; /* height of one pixel */ |
|
954 #endif |
|
955 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
956 png_charp scal_s_width; /* string containing height */ |
|
957 png_charp scal_s_height; /* string containing width */ |
|
958 #endif |
|
959 #endif |
|
960 |
|
961 #if defined(PNG_INFO_IMAGE_SUPPORTED) |
|
962 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ |
|
963 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ |
|
964 png_bytepp row_pointers; /* the image bits */ |
|
965 #endif |
|
966 |
|
967 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) |
|
968 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ |
|
969 #endif |
|
970 |
|
971 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) |
|
972 png_fixed_point int_x_white; |
|
973 png_fixed_point int_y_white; |
|
974 png_fixed_point int_x_red; |
|
975 png_fixed_point int_y_red; |
|
976 png_fixed_point int_x_green; |
|
977 png_fixed_point int_y_green; |
|
978 png_fixed_point int_x_blue; |
|
979 png_fixed_point int_y_blue; |
|
980 #endif |
|
981 |
|
982 } png_info; |
|
983 |
|
984 typedef png_info FAR * png_infop; |
|
985 typedef png_info FAR * FAR * png_infopp; |
|
986 |
|
987 /* Maximum positive integer used in PNG is (2^31)-1 */ |
|
988 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) |
|
989 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) |
|
990 #define PNG_SIZE_MAX ((png_size_t)(-1)) |
|
991 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
|
992 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ |
|
993 #define PNG_MAX_UINT PNG_UINT_31_MAX |
|
994 #endif |
|
995 |
|
996 /* These describe the color_type field in png_info. */ |
|
997 /* color type masks */ |
|
998 #define PNG_COLOR_MASK_PALETTE 1 |
|
999 #define PNG_COLOR_MASK_COLOR 2 |
|
1000 #define PNG_COLOR_MASK_ALPHA 4 |
|
1001 |
|
1002 /* color types. Note that not all combinations are legal */ |
|
1003 #define PNG_COLOR_TYPE_GRAY 0 |
|
1004 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
|
1005 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
|
1006 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
|
1007 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
|
1008 /* aliases */ |
|
1009 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
|
1010 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
|
1011 |
|
1012 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ |
|
1013 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
|
1014 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
|
1015 |
|
1016 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ |
|
1017 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
|
1018 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
|
1019 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
|
1020 |
|
1021 /* These are for the interlacing type. These values should NOT be changed. */ |
|
1022 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
|
1023 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
|
1024 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
|
1025 |
|
1026 /* These are for the oFFs chunk. These values should NOT be changed. */ |
|
1027 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
|
1028 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
|
1029 #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
|
1030 |
|
1031 /* These are for the pCAL chunk. These values should NOT be changed. */ |
|
1032 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
|
1033 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
|
1034 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
|
1035 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
|
1036 #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
|
1037 |
|
1038 /* These are for the sCAL chunk. These values should NOT be changed. */ |
|
1039 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
|
1040 #define PNG_SCALE_METER 1 /* meters per pixel */ |
|
1041 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
|
1042 #define PNG_SCALE_LAST 3 /* Not a valid value */ |
|
1043 |
|
1044 /* These are for the pHYs chunk. These values should NOT be changed. */ |
|
1045 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
|
1046 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
|
1047 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
|
1048 |
|
1049 /* These are for the sRGB chunk. These values should NOT be changed. */ |
|
1050 #define PNG_sRGB_INTENT_PERCEPTUAL 0 |
|
1051 #define PNG_sRGB_INTENT_RELATIVE 1 |
|
1052 #define PNG_sRGB_INTENT_SATURATION 2 |
|
1053 #define PNG_sRGB_INTENT_ABSOLUTE 3 |
|
1054 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
|
1055 |
|
1056 /* This is for text chunks */ |
|
1057 #define PNG_KEYWORD_MAX_LENGTH 79 |
|
1058 |
|
1059 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
|
1060 #define PNG_MAX_PALETTE_LENGTH 256 |
|
1061 |
|
1062 /* These determine if an ancillary chunk's data has been successfully read |
|
1063 * from the PNG header, or if the application has filled in the corresponding |
|
1064 * data in the info_struct to be written into the output file. The values |
|
1065 * of the PNG_INFO_<chunk> defines should NOT be changed. |
|
1066 */ |
|
1067 #define PNG_INFO_gAMA 0x0001 |
|
1068 #define PNG_INFO_sBIT 0x0002 |
|
1069 #define PNG_INFO_cHRM 0x0004 |
|
1070 #define PNG_INFO_PLTE 0x0008 |
|
1071 #define PNG_INFO_tRNS 0x0010 |
|
1072 #define PNG_INFO_bKGD 0x0020 |
|
1073 #define PNG_INFO_hIST 0x0040 |
|
1074 #define PNG_INFO_pHYs 0x0080 |
|
1075 #define PNG_INFO_oFFs 0x0100 |
|
1076 #define PNG_INFO_tIME 0x0200 |
|
1077 #define PNG_INFO_pCAL 0x0400 |
|
1078 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
|
1079 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ |
|
1080 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ |
|
1081 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ |
|
1082 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ |
|
1083 |
|
1084 /* This is used for the transformation routines, as some of them |
|
1085 * change these values for the row. It also should enable using |
|
1086 * the routines for other purposes. |
|
1087 */ |
|
1088 typedef struct png_row_info_struct |
|
1089 { |
|
1090 png_uint_32 width; /* width of row */ |
|
1091 png_uint_32 rowbytes; /* number of bytes in row */ |
|
1092 png_byte color_type; /* color type of row */ |
|
1093 png_byte bit_depth; /* bit depth of row */ |
|
1094 png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
|
1095 png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
|
1096 } png_row_info; |
|
1097 |
|
1098 typedef png_row_info FAR * png_row_infop; |
|
1099 typedef png_row_info FAR * FAR * png_row_infopp; |
|
1100 |
|
1101 /* These are the function types for the I/O functions and for the functions |
|
1102 * that allow the user to override the default I/O functions with his or her |
|
1103 * own. The png_error_ptr type should match that of user-supplied warning |
|
1104 * and error functions, while the png_rw_ptr type should match that of the |
|
1105 * user read/write data functions. |
|
1106 */ |
|
1107 typedef struct png_struct_def png_struct; |
|
1108 typedef png_struct FAR * png_structp; |
|
1109 |
|
1110 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); |
|
1111 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); |
|
1112 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); |
|
1113 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, |
|
1114 int)); |
|
1115 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, |
|
1116 int)); |
|
1117 |
|
1118 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
1119 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); |
|
1120 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); |
|
1121 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, |
|
1122 png_uint_32, int)); |
|
1123 #endif |
|
1124 |
|
1125 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
|
1126 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
|
1127 defined(PNG_LEGACY_SUPPORTED) |
|
1128 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, |
|
1129 png_row_infop, png_bytep)); |
|
1130 #endif |
|
1131 |
|
1132 #if defined(PNG_USER_CHUNKS_SUPPORTED) |
|
1133 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); |
|
1134 #endif |
|
1135 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
|
1136 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); |
|
1137 #endif |
|
1138 |
|
1139 /* Transform masks for the high-level interface */ |
|
1140 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
|
1141 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
|
1142 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
|
1143 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
|
1144 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
|
1145 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
|
1146 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
|
1147 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
|
1148 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
|
1149 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
|
1150 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
|
1151 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
|
1152 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */ |
|
1153 |
|
1154 /* Flags for MNG supported features */ |
|
1155 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
|
1156 #define PNG_FLAG_MNG_FILTER_64 0x04 |
|
1157 #define PNG_ALL_MNG_FEATURES 0x05 |
|
1158 |
|
1159 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); |
|
1160 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); |
|
1161 |
|
1162 /* The structure that holds the information to read and write PNG files. |
|
1163 * The only people who need to care about what is inside of this are the |
|
1164 * people who will be modifying the library for their own special needs. |
|
1165 * It should NOT be accessed directly by an application, except to store |
|
1166 * the jmp_buf. |
|
1167 */ |
|
1168 |
|
1169 struct png_struct_def |
|
1170 { |
|
1171 #ifdef PNG_SETJMP_SUPPORTED |
|
1172 jmp_buf jmpbuf; /* used in png_error */ |
|
1173 #endif |
|
1174 png_error_ptr error_fn; /* function for printing errors and aborting */ |
|
1175 png_error_ptr warning_fn; /* function for printing warnings */ |
|
1176 png_voidp error_ptr; /* user supplied struct for error functions */ |
|
1177 png_rw_ptr write_data_fn; /* function for writing output data */ |
|
1178 png_rw_ptr read_data_fn; /* function for reading input data */ |
|
1179 png_voidp io_ptr; /* ptr to application struct for I/O functions */ |
|
1180 |
|
1181 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) |
|
1182 png_user_transform_ptr read_user_transform_fn; /* user read transform */ |
|
1183 #endif |
|
1184 |
|
1185 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
|
1186 png_user_transform_ptr write_user_transform_fn; /* user write transform */ |
|
1187 #endif |
|
1188 |
|
1189 /* These were added in libpng-1.0.2 */ |
|
1190 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
|
1191 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
|
1192 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
|
1193 png_voidp user_transform_ptr; /* user supplied struct for user transform */ |
|
1194 png_byte user_transform_depth; /* bit depth of user transformed pixels */ |
|
1195 png_byte user_transform_channels; /* channels in user transformed pixels */ |
|
1196 #endif |
|
1197 #endif |
|
1198 |
|
1199 png_uint_32 mode; /* tells us where we are in the PNG file */ |
|
1200 png_uint_32 flags; /* flags indicating various things to libpng */ |
|
1201 png_uint_32 transformations; /* which transformations to perform */ |
|
1202 |
|
1203 z_stream zstream; /* pointer to decompression structure (below) */ |
|
1204 png_bytep zbuf; /* buffer for zlib */ |
|
1205 png_size_t zbuf_size; /* size of zbuf */ |
|
1206 int zlib_level; /* holds zlib compression level */ |
|
1207 int zlib_method; /* holds zlib compression method */ |
|
1208 int zlib_window_bits; /* holds zlib compression window bits */ |
|
1209 int zlib_mem_level; /* holds zlib compression memory level */ |
|
1210 int zlib_strategy; /* holds zlib compression strategy */ |
|
1211 |
|
1212 png_uint_32 width; /* width of image in pixels */ |
|
1213 png_uint_32 height; /* height of image in pixels */ |
|
1214 png_uint_32 num_rows; /* number of rows in current pass */ |
|
1215 png_uint_32 usr_width; /* width of row at start of write */ |
|
1216 png_uint_32 rowbytes; /* size of row in bytes */ |
|
1217 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ |
|
1218 png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
|
1219 png_uint_32 row_number; /* current row in interlace pass */ |
|
1220 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ |
|
1221 png_bytep row_buf; /* buffer to save current (unfiltered) row */ |
|
1222 #ifndef PNG_NO_WRITE_FILTER |
|
1223 png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
|
1224 png_bytep up_row; /* buffer to save "up" row when filtering */ |
|
1225 png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
|
1226 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
|
1227 #endif |
|
1228 png_row_info row_info; /* used for transformation routines */ |
|
1229 |
|
1230 png_uint_32 idat_size; /* current IDAT size for read */ |
|
1231 png_uint_32 crc; /* current chunk CRC value */ |
|
1232 png_colorp palette; /* palette from the input file */ |
|
1233 png_uint_16 num_palette; /* number of color entries in palette */ |
|
1234 png_uint_16 num_trans; /* number of transparency values */ |
|
1235 png_byte chunk_name[5]; /* null-terminated name of current chunk */ |
|
1236 png_byte compression; /* file compression type (always 0) */ |
|
1237 png_byte filter; /* file filter type (always 0) */ |
|
1238 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
|
1239 png_byte pass; /* current interlace pass (0 - 6) */ |
|
1240 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
|
1241 png_byte color_type; /* color type of file */ |
|
1242 png_byte bit_depth; /* bit depth of file */ |
|
1243 png_byte usr_bit_depth; /* bit depth of users row */ |
|
1244 png_byte pixel_depth; /* number of bits per pixel */ |
|
1245 png_byte channels; /* number of channels in file */ |
|
1246 png_byte usr_channels; /* channels at start of write */ |
|
1247 png_byte sig_bytes; /* magic bytes read/written from start of file */ |
|
1248 |
|
1249 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
|
1250 #ifdef PNG_LEGACY_SUPPORTED |
|
1251 png_byte filler; /* filler byte for pixel expansion */ |
|
1252 #else |
|
1253 png_uint_16 filler; /* filler bytes for pixel expansion */ |
|
1254 #endif |
|
1255 #endif |
|
1256 |
|
1257 #if defined(PNG_bKGD_SUPPORTED) |
|
1258 png_byte background_gamma_type; |
|
1259 # ifdef PNG_FLOATING_POINT_SUPPORTED |
|
1260 float background_gamma; |
|
1261 # endif |
|
1262 png_color_16 background; /* background color in screen gamma space */ |
|
1263 #if defined(PNG_READ_GAMMA_SUPPORTED) |
|
1264 png_color_16 background_1; /* background normalized to gamma 1.0 */ |
|
1265 #endif |
|
1266 #endif /* PNG_bKGD_SUPPORTED */ |
|
1267 |
|
1268 #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
|
1269 png_flush_ptr output_flush_fn;/* Function for flushing output */ |
|
1270 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
|
1271 png_uint_32 flush_rows; /* number of rows written since last flush */ |
|
1272 #endif |
|
1273 |
|
1274 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
1275 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ |
|
1276 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
1277 float gamma; /* file gamma value */ |
|
1278 float screen_gamma; /* screen gamma value (display_exponent) */ |
|
1279 #endif |
|
1280 #endif |
|
1281 |
|
1282 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
1283 png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
|
1284 png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
|
1285 png_bytep gamma_to_1; /* converts from file to 1.0 */ |
|
1286 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
|
1287 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
|
1288 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
|
1289 #endif |
|
1290 |
|
1291 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
|
1292 png_color_8 sig_bit; /* significant bits in each available channel */ |
|
1293 #endif |
|
1294 |
|
1295 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
|
1296 png_color_8 shift; /* shift for significant bit tranformation */ |
|
1297 #endif |
|
1298 |
|
1299 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ |
|
1300 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
1301 png_bytep trans; /* transparency values for paletted files */ |
|
1302 png_color_16 trans_values; /* transparency values for non-paletted files */ |
|
1303 #endif |
|
1304 |
|
1305 png_read_status_ptr read_row_fn; /* called after each row is decoded */ |
|
1306 png_write_status_ptr write_row_fn; /* called after each row is encoded */ |
|
1307 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
1308 png_progressive_info_ptr info_fn; /* called after header data fully read */ |
|
1309 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ |
|
1310 png_progressive_end_ptr end_fn; /* called after image is complete */ |
|
1311 png_bytep save_buffer_ptr; /* current location in save_buffer */ |
|
1312 png_bytep save_buffer; /* buffer for previously read data */ |
|
1313 png_bytep current_buffer_ptr; /* current location in current_buffer */ |
|
1314 png_bytep current_buffer; /* buffer for recently used data */ |
|
1315 png_uint_32 push_length; /* size of current input chunk */ |
|
1316 png_uint_32 skip_length; /* bytes to skip in input data */ |
|
1317 png_size_t save_buffer_size; /* amount of data now in save_buffer */ |
|
1318 png_size_t save_buffer_max; /* total size of save_buffer */ |
|
1319 png_size_t buffer_size; /* total amount of available input data */ |
|
1320 png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
|
1321 int process_mode; /* what push library is currently doing */ |
|
1322 int cur_palette; /* current push library palette index */ |
|
1323 |
|
1324 # if defined(PNG_TEXT_SUPPORTED) |
|
1325 png_size_t current_text_size; /* current size of text input data */ |
|
1326 png_size_t current_text_left; /* how much text left to read in input */ |
|
1327 png_charp current_text; /* current text chunk buffer */ |
|
1328 png_charp current_text_ptr; /* current location in current_text */ |
|
1329 # endif /* PNG_TEXT_SUPPORTED */ |
|
1330 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
1331 |
|
1332 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
|
1333 /* for the Borland special 64K segment handler */ |
|
1334 png_bytepp offset_table_ptr; |
|
1335 png_bytep offset_table; |
|
1336 png_uint_16 offset_table_number; |
|
1337 png_uint_16 offset_table_count; |
|
1338 png_uint_16 offset_table_count_free; |
|
1339 #endif |
|
1340 |
|
1341 #if defined(PNG_READ_DITHER_SUPPORTED) |
|
1342 png_bytep palette_lookup; /* lookup table for dithering */ |
|
1343 png_bytep dither_index; /* index translation for palette files */ |
|
1344 #endif |
|
1345 |
|
1346 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) |
|
1347 png_uint_16p hist; /* histogram */ |
|
1348 #endif |
|
1349 |
|
1350 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
|
1351 png_byte heuristic_method; /* heuristic for row filter selection */ |
|
1352 png_byte num_prev_filters; /* number of weights for previous rows */ |
|
1353 png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
|
1354 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
|
1355 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
|
1356 png_uint_16p filter_costs; /* relative filter calculation cost */ |
|
1357 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
|
1358 #endif |
|
1359 |
|
1360 #if defined(PNG_TIME_RFC1123_SUPPORTED) |
|
1361 png_charp time_buffer; /* String to hold RFC 1123 time text */ |
|
1362 #endif |
|
1363 |
|
1364 /* New members added in libpng-1.0.6 */ |
|
1365 |
|
1366 #ifdef PNG_FREE_ME_SUPPORTED |
|
1367 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
|
1368 #endif |
|
1369 |
|
1370 #if defined(PNG_USER_CHUNKS_SUPPORTED) |
|
1371 png_voidp user_chunk_ptr; |
|
1372 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
|
1373 #endif |
|
1374 |
|
1375 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
|
1376 int num_chunk_list; |
|
1377 png_bytep chunk_list; |
|
1378 #endif |
|
1379 |
|
1380 /* New members added in libpng-1.0.3 */ |
|
1381 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
|
1382 png_byte rgb_to_gray_status; |
|
1383 /* These were changed from png_byte in libpng-1.0.6 */ |
|
1384 png_uint_16 rgb_to_gray_red_coeff; |
|
1385 png_uint_16 rgb_to_gray_green_coeff; |
|
1386 png_uint_16 rgb_to_gray_blue_coeff; |
|
1387 #endif |
|
1388 |
|
1389 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ |
|
1390 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ |
|
1391 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
|
1392 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
|
1393 /* changed from png_byte to png_uint_32 at version 1.2.0 */ |
|
1394 #ifdef PNG_1_0_X |
|
1395 png_byte mng_features_permitted; |
|
1396 #else |
|
1397 png_uint_32 mng_features_permitted; |
|
1398 #endif /* PNG_1_0_X */ |
|
1399 #endif |
|
1400 |
|
1401 /* New member added in libpng-1.0.7 */ |
|
1402 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
1403 png_fixed_point int_gamma; |
|
1404 #endif |
|
1405 |
|
1406 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ |
|
1407 #if defined(PNG_MNG_FEATURES_SUPPORTED) |
|
1408 png_byte filter_type; |
|
1409 #endif |
|
1410 |
|
1411 #if defined(PNG_1_0_X) |
|
1412 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ |
|
1413 png_uint_32 row_buf_size; |
|
1414 #endif |
|
1415 |
|
1416 /* New members added in libpng-1.2.0 */ |
|
1417 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
|
1418 # if !defined(PNG_1_0_X) |
|
1419 # if defined(PNG_MMX_CODE_SUPPORTED) |
|
1420 png_byte mmx_bitdepth_threshold; |
|
1421 png_uint_32 mmx_rowbytes_threshold; |
|
1422 # endif |
|
1423 png_uint_32 asm_flags; |
|
1424 # endif |
|
1425 #endif |
|
1426 |
|
1427 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ |
|
1428 #ifdef PNG_USER_MEM_SUPPORTED |
|
1429 png_voidp mem_ptr; /* user supplied struct for mem functions */ |
|
1430 png_malloc_ptr malloc_fn; /* function for allocating memory */ |
|
1431 png_free_ptr free_fn; /* function for freeing memory */ |
|
1432 #endif |
|
1433 |
|
1434 /* New member added in libpng-1.0.13 and 1.2.0 */ |
|
1435 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ |
|
1436 |
|
1437 #if defined(PNG_READ_DITHER_SUPPORTED) |
|
1438 /* The following three members were added at version 1.0.14 and 1.2.4 */ |
|
1439 png_bytep dither_sort; /* working sort array */ |
|
1440 png_bytep index_to_palette; /* where the original index currently is */ |
|
1441 /* in the palette */ |
|
1442 png_bytep palette_to_index; /* which original index points to this */ |
|
1443 /* palette color */ |
|
1444 #endif |
|
1445 |
|
1446 /* New members added in libpng-1.0.16 and 1.2.6 */ |
|
1447 png_byte compression_type; |
|
1448 |
|
1449 #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
|
1450 png_uint_32 user_width_max; |
|
1451 png_uint_32 user_height_max; |
|
1452 #endif |
|
1453 |
|
1454 /* New member added in libpng-1.0.25 and 1.2.17 */ |
|
1455 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
|
1456 /* storage for unknown chunk that the library doesn't recognize. */ |
|
1457 png_unknown_chunk unknown_chunk; |
|
1458 #endif |
|
1459 |
|
1460 /* New members added in libpng-1.2.26 */ |
|
1461 png_uint_32 old_big_row_buf_size, old_prev_row_size; |
|
1462 |
|
1463 /* New member added in libpng-1.2.30 */ |
|
1464 png_charp chunkdata; /* buffer for reading chunk data */ |
|
1465 |
|
1466 }; |
|
1467 |
|
1468 |
|
1469 /* This triggers a compiler error in png.c, if png.c and png.h |
|
1470 * do not agree upon the version number. |
|
1471 */ |
|
1472 typedef png_structp version_1_2_32; |
|
1473 |
|
1474 typedef png_struct FAR * FAR * png_structpp; |
|
1475 |
|
1476 /* Here are the function definitions most commonly used. This is not |
|
1477 * the place to find out how to use libpng. See libpng.txt for the |
|
1478 * full explanation, see example.c for the summary. This just provides |
|
1479 * a simple one line description of the use of each function. |
|
1480 */ |
|
1481 |
|
1482 /* Returns the version number of the library */ |
|
1483 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); |
|
1484 |
|
1485 /* Tell lib we have already handled the first <num_bytes> magic bytes. |
|
1486 * Handling more than 8 bytes from the beginning of the file is an error. |
|
1487 */ |
|
1488 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, |
|
1489 int num_bytes)); |
|
1490 |
|
1491 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
|
1492 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
|
1493 * signature, and non-zero otherwise. Having num_to_check == 0 or |
|
1494 * start > 7 will always fail (ie return non-zero). |
|
1495 */ |
|
1496 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, |
|
1497 png_size_t num_to_check)); |
|
1498 |
|
1499 /* Simple signature checking function. This is the same as calling |
|
1500 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
|
1501 */ |
|
1502 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); |
|
1503 |
|
1504 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
|
1505 extern PNG_EXPORT(png_structp,png_create_read_struct) |
|
1506 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
|
1507 png_error_ptr error_fn, png_error_ptr warn_fn)); |
|
1508 |
|
1509 /* Allocate and initialize png_ptr struct for writing, and any other memory */ |
|
1510 extern PNG_EXPORT(png_structp,png_create_write_struct) |
|
1511 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
|
1512 png_error_ptr error_fn, png_error_ptr warn_fn)); |
|
1513 |
|
1514 #ifdef PNG_WRITE_SUPPORTED |
|
1515 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) |
|
1516 PNGARG((png_structp png_ptr)); |
|
1517 #endif |
|
1518 |
|
1519 #ifdef PNG_WRITE_SUPPORTED |
|
1520 extern PNG_EXPORT(void,png_set_compression_buffer_size) |
|
1521 PNGARG((png_structp png_ptr, png_uint_32 size)); |
|
1522 #endif |
|
1523 |
|
1524 /* Reset the compression stream */ |
|
1525 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); |
|
1526 |
|
1527 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ |
|
1528 #ifdef PNG_USER_MEM_SUPPORTED |
|
1529 extern PNG_EXPORT(png_structp,png_create_read_struct_2) |
|
1530 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
|
1531 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
|
1532 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
|
1533 extern PNG_EXPORT(png_structp,png_create_write_struct_2) |
|
1534 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
|
1535 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
|
1536 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
|
1537 #endif |
|
1538 |
|
1539 /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
|
1540 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, |
|
1541 png_bytep chunk_name, png_bytep data, png_size_t length)); |
|
1542 |
|
1543 /* Write the start of a PNG chunk - length and chunk name. */ |
|
1544 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, |
|
1545 png_bytep chunk_name, png_uint_32 length)); |
|
1546 |
|
1547 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
|
1548 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, |
|
1549 png_bytep data, png_size_t length)); |
|
1550 |
|
1551 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
|
1552 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); |
|
1553 |
|
1554 /* Allocate and initialize the info structure */ |
|
1555 extern PNG_EXPORT(png_infop,png_create_info_struct) |
|
1556 PNGARG((png_structp png_ptr)); |
|
1557 |
|
1558 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
|
1559 /* Initialize the info structure (old interface - DEPRECATED) */ |
|
1560 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); |
|
1561 #undef png_info_init |
|
1562 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ |
|
1563 png_sizeof(png_info)); |
|
1564 #endif |
|
1565 |
|
1566 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, |
|
1567 png_size_t png_info_struct_size)); |
|
1568 |
|
1569 /* Writes all the PNG information before the image. */ |
|
1570 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, |
|
1571 png_infop info_ptr)); |
|
1572 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, |
|
1573 png_infop info_ptr)); |
|
1574 |
|
1575 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
|
1576 /* read the information before the actual image data. */ |
|
1577 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, |
|
1578 png_infop info_ptr)); |
|
1579 #endif |
|
1580 |
|
1581 #if defined(PNG_TIME_RFC1123_SUPPORTED) |
|
1582 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) |
|
1583 PNGARG((png_structp png_ptr, png_timep ptime)); |
|
1584 #endif |
|
1585 |
|
1586 #if !defined(_WIN32_WCE) |
|
1587 /* "time.h" functions are not supported on WindowsCE */ |
|
1588 #if defined(PNG_WRITE_tIME_SUPPORTED) |
|
1589 /* convert from a struct tm to png_time */ |
|
1590 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, |
|
1591 struct tm FAR * ttime)); |
|
1592 |
|
1593 /* convert from time_t to png_time. Uses gmtime() */ |
|
1594 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, |
|
1595 time_t ttime)); |
|
1596 #endif /* PNG_WRITE_tIME_SUPPORTED */ |
|
1597 #endif /* _WIN32_WCE */ |
|
1598 |
|
1599 #if defined(PNG_READ_EXPAND_SUPPORTED) |
|
1600 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
|
1601 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); |
|
1602 #if !defined(PNG_1_0_X) |
|
1603 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp |
|
1604 png_ptr)); |
|
1605 #endif |
|
1606 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); |
|
1607 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); |
|
1608 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
|
1609 /* Deprecated */ |
|
1610 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); |
|
1611 #endif |
|
1612 #endif |
|
1613 |
|
1614 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
|
1615 /* Use blue, green, red order for pixels. */ |
|
1616 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); |
|
1617 #endif |
|
1618 |
|
1619 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
|
1620 /* Expand the grayscale to 24-bit RGB if necessary. */ |
|
1621 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); |
|
1622 #endif |
|
1623 |
|
1624 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
|
1625 /* Reduce RGB to grayscale. */ |
|
1626 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
1627 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, |
|
1628 int error_action, double red, double green )); |
|
1629 #endif |
|
1630 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, |
|
1631 int error_action, png_fixed_point red, png_fixed_point green )); |
|
1632 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp |
|
1633 png_ptr)); |
|
1634 #endif |
|
1635 |
|
1636 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, |
|
1637 png_colorp palette)); |
|
1638 |
|
1639 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
|
1640 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); |
|
1641 #endif |
|
1642 |
|
1643 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
|
1644 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
|
1645 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); |
|
1646 #endif |
|
1647 |
|
1648 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
|
1649 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
|
1650 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); |
|
1651 #endif |
|
1652 |
|
1653 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
|
1654 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ |
|
1655 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, |
|
1656 png_uint_32 filler, int flags)); |
|
1657 /* The values of the PNG_FILLER_ defines should NOT be changed */ |
|
1658 #define PNG_FILLER_BEFORE 0 |
|
1659 #define PNG_FILLER_AFTER 1 |
|
1660 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ |
|
1661 #if !defined(PNG_1_0_X) |
|
1662 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, |
|
1663 png_uint_32 filler, int flags)); |
|
1664 #endif |
|
1665 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
|
1666 |
|
1667 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
|
1668 /* Swap bytes in 16-bit depth files. */ |
|
1669 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); |
|
1670 #endif |
|
1671 |
|
1672 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
|
1673 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
|
1674 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); |
|
1675 #endif |
|
1676 |
|
1677 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
|
1678 /* Swap packing order of pixels in bytes. */ |
|
1679 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); |
|
1680 #endif |
|
1681 |
|
1682 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
|
1683 /* Converts files to legal bit depths. */ |
|
1684 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, |
|
1685 png_color_8p true_bits)); |
|
1686 #endif |
|
1687 |
|
1688 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
|
1689 defined(PNG_WRITE_INTERLACING_SUPPORTED) |
|
1690 /* Have the code handle the interlacing. Returns the number of passes. */ |
|
1691 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); |
|
1692 #endif |
|
1693 |
|
1694 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
|
1695 /* Invert monochrome files */ |
|
1696 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); |
|
1697 #endif |
|
1698 |
|
1699 #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
1700 /* Handle alpha and tRNS by replacing with a background color. */ |
|
1701 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
1702 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, |
|
1703 png_color_16p background_color, int background_gamma_code, |
|
1704 int need_expand, double background_gamma)); |
|
1705 #endif |
|
1706 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
|
1707 #define PNG_BACKGROUND_GAMMA_SCREEN 1 |
|
1708 #define PNG_BACKGROUND_GAMMA_FILE 2 |
|
1709 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
|
1710 #endif |
|
1711 |
|
1712 #if defined(PNG_READ_16_TO_8_SUPPORTED) |
|
1713 /* strip the second byte of information from a 16-bit depth file. */ |
|
1714 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); |
|
1715 #endif |
|
1716 |
|
1717 #if defined(PNG_READ_DITHER_SUPPORTED) |
|
1718 /* Turn on dithering, and reduce the palette to the number of colors available. */ |
|
1719 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, |
|
1720 png_colorp palette, int num_palette, int maximum_colors, |
|
1721 png_uint_16p histogram, int full_dither)); |
|
1722 #endif |
|
1723 |
|
1724 #if defined(PNG_READ_GAMMA_SUPPORTED) |
|
1725 /* Handle gamma correction. Screen_gamma=(display_exponent) */ |
|
1726 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
1727 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, |
|
1728 double screen_gamma, double default_file_gamma)); |
|
1729 #endif |
|
1730 #endif |
|
1731 |
|
1732 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
|
1733 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
|
1734 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
|
1735 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ |
|
1736 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ |
|
1737 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, |
|
1738 int empty_plte_permitted)); |
|
1739 #endif |
|
1740 #endif |
|
1741 |
|
1742 #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
|
1743 /* Set how many lines between output flushes - 0 for no flushing */ |
|
1744 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); |
|
1745 /* Flush the current PNG output buffer */ |
|
1746 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); |
|
1747 #endif |
|
1748 |
|
1749 /* optional update palette with requested transformations */ |
|
1750 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); |
|
1751 |
|
1752 /* optional call to update the users info structure */ |
|
1753 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, |
|
1754 png_infop info_ptr)); |
|
1755 |
|
1756 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
|
1757 /* read one or more rows of image data. */ |
|
1758 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, |
|
1759 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); |
|
1760 #endif |
|
1761 |
|
1762 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
|
1763 /* read a row of data. */ |
|
1764 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, |
|
1765 png_bytep row, |
|
1766 png_bytep display_row)); |
|
1767 #endif |
|
1768 |
|
1769 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
|
1770 /* read the whole image into memory at once. */ |
|
1771 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, |
|
1772 png_bytepp image)); |
|
1773 #endif |
|
1774 |
|
1775 /* write a row of image data */ |
|
1776 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, |
|
1777 png_bytep row)); |
|
1778 |
|
1779 /* write a few rows of image data */ |
|
1780 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, |
|
1781 png_bytepp row, png_uint_32 num_rows)); |
|
1782 |
|
1783 /* write the image data */ |
|
1784 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, |
|
1785 png_bytepp image)); |
|
1786 |
|
1787 /* writes the end of the PNG file. */ |
|
1788 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, |
|
1789 png_infop info_ptr)); |
|
1790 |
|
1791 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
|
1792 /* read the end of the PNG file. */ |
|
1793 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, |
|
1794 png_infop info_ptr)); |
|
1795 #endif |
|
1796 |
|
1797 /* free any memory associated with the png_info_struct */ |
|
1798 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, |
|
1799 png_infopp info_ptr_ptr)); |
|
1800 |
|
1801 /* free any memory associated with the png_struct and the png_info_structs */ |
|
1802 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp |
|
1803 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
|
1804 |
|
1805 /* free all memory used by the read (old method - NOT DLL EXPORTED) */ |
|
1806 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
1807 png_infop end_info_ptr)); |
|
1808 |
|
1809 /* free any memory associated with the png_struct and the png_info_structs */ |
|
1810 extern PNG_EXPORT(void,png_destroy_write_struct) |
|
1811 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); |
|
1812 |
|
1813 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
|
1814 extern void png_write_destroy PNGARG((png_structp png_ptr)); |
|
1815 |
|
1816 /* set the libpng method of handling chunk CRC errors */ |
|
1817 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, |
|
1818 int crit_action, int ancil_action)); |
|
1819 |
|
1820 /* Values for png_set_crc_action() to say how to handle CRC errors in |
|
1821 * ancillary and critical chunks, and whether to use the data contained |
|
1822 * therein. Note that it is impossible to "discard" data in a critical |
|
1823 * chunk. For versions prior to 0.90, the action was always error/quit, |
|
1824 * whereas in version 0.90 and later, the action for CRC errors in ancillary |
|
1825 * chunks is warn/discard. These values should NOT be changed. |
|
1826 * |
|
1827 * value action:critical action:ancillary |
|
1828 */ |
|
1829 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
|
1830 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
|
1831 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
|
1832 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
|
1833 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
|
1834 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
|
1835 |
|
1836 /* These functions give the user control over the scan-line filtering in |
|
1837 * libpng and the compression methods used by zlib. These functions are |
|
1838 * mainly useful for testing, as the defaults should work with most users. |
|
1839 * Those users who are tight on memory or want faster performance at the |
|
1840 * expense of compression can modify them. See the compression library |
|
1841 * header file (zlib.h) for an explination of the compression functions. |
|
1842 */ |
|
1843 |
|
1844 /* set the filtering method(s) used by libpng. Currently, the only valid |
|
1845 * value for "method" is 0. |
|
1846 */ |
|
1847 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, |
|
1848 int filters)); |
|
1849 |
|
1850 /* Flags for png_set_filter() to say which filters to use. The flags |
|
1851 * are chosen so that they don't conflict with real filter types |
|
1852 * below, in case they are supplied instead of the #defined constants. |
|
1853 * These values should NOT be changed. |
|
1854 */ |
|
1855 #define PNG_NO_FILTERS 0x00 |
|
1856 #define PNG_FILTER_NONE 0x08 |
|
1857 #define PNG_FILTER_SUB 0x10 |
|
1858 #define PNG_FILTER_UP 0x20 |
|
1859 #define PNG_FILTER_AVG 0x40 |
|
1860 #define PNG_FILTER_PAETH 0x80 |
|
1861 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
|
1862 PNG_FILTER_AVG | PNG_FILTER_PAETH) |
|
1863 |
|
1864 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
|
1865 * These defines should NOT be changed. |
|
1866 */ |
|
1867 #define PNG_FILTER_VALUE_NONE 0 |
|
1868 #define PNG_FILTER_VALUE_SUB 1 |
|
1869 #define PNG_FILTER_VALUE_UP 2 |
|
1870 #define PNG_FILTER_VALUE_AVG 3 |
|
1871 #define PNG_FILTER_VALUE_PAETH 4 |
|
1872 #define PNG_FILTER_VALUE_LAST 5 |
|
1873 |
|
1874 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ |
|
1875 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
|
1876 * defines, either the default (minimum-sum-of-absolute-differences), or |
|
1877 * the experimental method (weighted-minimum-sum-of-absolute-differences). |
|
1878 * |
|
1879 * Weights are factors >= 1.0, indicating how important it is to keep the |
|
1880 * filter type consistent between rows. Larger numbers mean the current |
|
1881 * filter is that many times as likely to be the same as the "num_weights" |
|
1882 * previous filters. This is cumulative for each previous row with a weight. |
|
1883 * There needs to be "num_weights" values in "filter_weights", or it can be |
|
1884 * NULL if the weights aren't being specified. Weights have no influence on |
|
1885 * the selection of the first row filter. Well chosen weights can (in theory) |
|
1886 * improve the compression for a given image. |
|
1887 * |
|
1888 * Costs are factors >= 1.0 indicating the relative decoding costs of a |
|
1889 * filter type. Higher costs indicate more decoding expense, and are |
|
1890 * therefore less likely to be selected over a filter with lower computational |
|
1891 * costs. There needs to be a value in "filter_costs" for each valid filter |
|
1892 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
|
1893 * setting the costs. Costs try to improve the speed of decompression without |
|
1894 * unduly increasing the compressed image size. |
|
1895 * |
|
1896 * A negative weight or cost indicates the default value is to be used, and |
|
1897 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
|
1898 * The default values for both weights and costs are currently 1.0, but may |
|
1899 * change if good general weighting/cost heuristics can be found. If both |
|
1900 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
|
1901 * to the UNWEIGHTED method, but with added encoding time/computation. |
|
1902 */ |
|
1903 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
1904 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, |
|
1905 int heuristic_method, int num_weights, png_doublep filter_weights, |
|
1906 png_doublep filter_costs)); |
|
1907 #endif |
|
1908 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
|
1909 |
|
1910 /* Heuristic used for row filter selection. These defines should NOT be |
|
1911 * changed. |
|
1912 */ |
|
1913 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
|
1914 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
|
1915 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
|
1916 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
|
1917 |
|
1918 /* Set the library compression level. Currently, valid values range from |
|
1919 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
|
1920 * (0 - no compression, 9 - "maximal" compression). Note that tests have |
|
1921 * shown that zlib compression levels 3-6 usually perform as well as level 9 |
|
1922 * for PNG images, and do considerably fewer caclulations. In the future, |
|
1923 * these values may not correspond directly to the zlib compression levels. |
|
1924 */ |
|
1925 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, |
|
1926 int level)); |
|
1927 |
|
1928 extern PNG_EXPORT(void,png_set_compression_mem_level) |
|
1929 PNGARG((png_structp png_ptr, int mem_level)); |
|
1930 |
|
1931 extern PNG_EXPORT(void,png_set_compression_strategy) |
|
1932 PNGARG((png_structp png_ptr, int strategy)); |
|
1933 |
|
1934 extern PNG_EXPORT(void,png_set_compression_window_bits) |
|
1935 PNGARG((png_structp png_ptr, int window_bits)); |
|
1936 |
|
1937 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, |
|
1938 int method)); |
|
1939 |
|
1940 /* These next functions are called for input/output, memory, and error |
|
1941 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
|
1942 * and call standard C I/O routines such as fread(), fwrite(), and |
|
1943 * fprintf(). These functions can be made to use other I/O routines |
|
1944 * at run time for those applications that need to handle I/O in a |
|
1945 * different manner by calling png_set_???_fn(). See libpng.txt for |
|
1946 * more information. |
|
1947 */ |
|
1948 |
|
1949 #if !defined(PNG_NO_STDIO) |
|
1950 /* Initialize the input/output for the PNG file to the default functions. */ |
|
1951 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); |
|
1952 #endif |
|
1953 |
|
1954 /* Replace the (error and abort), and warning functions with user |
|
1955 * supplied functions. If no messages are to be printed you must still |
|
1956 * write and use replacement functions. The replacement error_fn should |
|
1957 * still do a longjmp to the last setjmp location if you are using this |
|
1958 * method of error handling. If error_fn or warning_fn is NULL, the |
|
1959 * default function will be used. |
|
1960 */ |
|
1961 |
|
1962 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, |
|
1963 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
|
1964 |
|
1965 /* Return the user pointer associated with the error functions */ |
|
1966 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); |
|
1967 |
|
1968 /* Replace the default data output functions with a user supplied one(s). |
|
1969 * If buffered output is not used, then output_flush_fn can be set to NULL. |
|
1970 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
|
1971 * output_flush_fn will be ignored (and thus can be NULL). |
|
1972 */ |
|
1973 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, |
|
1974 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
|
1975 |
|
1976 /* Replace the default data input function with a user supplied one. */ |
|
1977 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, |
|
1978 png_voidp io_ptr, png_rw_ptr read_data_fn)); |
|
1979 |
|
1980 /* Return the user pointer associated with the I/O functions */ |
|
1981 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); |
|
1982 |
|
1983 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, |
|
1984 png_read_status_ptr read_row_fn)); |
|
1985 |
|
1986 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, |
|
1987 png_write_status_ptr write_row_fn)); |
|
1988 |
|
1989 #ifdef PNG_USER_MEM_SUPPORTED |
|
1990 /* Replace the default memory allocation functions with user supplied one(s). */ |
|
1991 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, |
|
1992 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
|
1993 /* Return the user pointer associated with the memory functions */ |
|
1994 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); |
|
1995 #endif |
|
1996 |
|
1997 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
|
1998 defined(PNG_LEGACY_SUPPORTED) |
|
1999 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp |
|
2000 png_ptr, png_user_transform_ptr read_user_transform_fn)); |
|
2001 #endif |
|
2002 |
|
2003 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
|
2004 defined(PNG_LEGACY_SUPPORTED) |
|
2005 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp |
|
2006 png_ptr, png_user_transform_ptr write_user_transform_fn)); |
|
2007 #endif |
|
2008 |
|
2009 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
|
2010 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
|
2011 defined(PNG_LEGACY_SUPPORTED) |
|
2012 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp |
|
2013 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, |
|
2014 int user_transform_channels)); |
|
2015 /* Return the user pointer associated with the user transform functions */ |
|
2016 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) |
|
2017 PNGARG((png_structp png_ptr)); |
|
2018 #endif |
|
2019 |
|
2020 #ifdef PNG_USER_CHUNKS_SUPPORTED |
|
2021 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, |
|
2022 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
|
2023 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp |
|
2024 png_ptr)); |
|
2025 #endif |
|
2026 |
|
2027 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
2028 /* Sets the function callbacks for the push reader, and a pointer to a |
|
2029 * user-defined structure available to the callback functions. |
|
2030 */ |
|
2031 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, |
|
2032 png_voidp progressive_ptr, |
|
2033 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
|
2034 png_progressive_end_ptr end_fn)); |
|
2035 |
|
2036 /* returns the user pointer associated with the push read functions */ |
|
2037 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) |
|
2038 PNGARG((png_structp png_ptr)); |
|
2039 |
|
2040 /* function to be called when data becomes available */ |
|
2041 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, |
|
2042 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); |
|
2043 |
|
2044 /* function that combines rows. Not very much different than the |
|
2045 * png_combine_row() call. Is this even used????? |
|
2046 */ |
|
2047 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, |
|
2048 png_bytep old_row, png_bytep new_row)); |
|
2049 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
2050 |
|
2051 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, |
|
2052 png_uint_32 size)); |
|
2053 |
|
2054 #if defined(PNG_1_0_X) |
|
2055 # define png_malloc_warn png_malloc |
|
2056 #else |
|
2057 /* Added at libpng version 1.2.4 */ |
|
2058 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, |
|
2059 png_uint_32 size)); |
|
2060 #endif |
|
2061 |
|
2062 /* frees a pointer allocated by png_malloc() */ |
|
2063 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); |
|
2064 |
|
2065 #if defined(PNG_1_0_X) |
|
2066 /* Function to allocate memory for zlib. */ |
|
2067 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, |
|
2068 uInt size)); |
|
2069 |
|
2070 /* Function to free memory for zlib */ |
|
2071 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); |
|
2072 #endif |
|
2073 |
|
2074 /* Free data that was allocated internally */ |
|
2075 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, |
|
2076 png_infop info_ptr, png_uint_32 free_me, int num)); |
|
2077 #ifdef PNG_FREE_ME_SUPPORTED |
|
2078 /* Reassign responsibility for freeing existing data, whether allocated |
|
2079 * by libpng or by the application */ |
|
2080 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, |
|
2081 png_infop info_ptr, int freer, png_uint_32 mask)); |
|
2082 #endif |
|
2083 /* assignments for png_data_freer */ |
|
2084 #define PNG_DESTROY_WILL_FREE_DATA 1 |
|
2085 #define PNG_SET_WILL_FREE_DATA 1 |
|
2086 #define PNG_USER_WILL_FREE_DATA 2 |
|
2087 /* Flags for png_ptr->free_me and info_ptr->free_me */ |
|
2088 #define PNG_FREE_HIST 0x0008 |
|
2089 #define PNG_FREE_ICCP 0x0010 |
|
2090 #define PNG_FREE_SPLT 0x0020 |
|
2091 #define PNG_FREE_ROWS 0x0040 |
|
2092 #define PNG_FREE_PCAL 0x0080 |
|
2093 #define PNG_FREE_SCAL 0x0100 |
|
2094 #define PNG_FREE_UNKN 0x0200 |
|
2095 #define PNG_FREE_LIST 0x0400 |
|
2096 #define PNG_FREE_PLTE 0x1000 |
|
2097 #define PNG_FREE_TRNS 0x2000 |
|
2098 #define PNG_FREE_TEXT 0x4000 |
|
2099 #define PNG_FREE_ALL 0x7fff |
|
2100 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ |
|
2101 |
|
2102 #ifdef PNG_USER_MEM_SUPPORTED |
|
2103 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, |
|
2104 png_uint_32 size)); |
|
2105 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, |
|
2106 png_voidp ptr)); |
|
2107 #endif |
|
2108 |
|
2109 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, |
|
2110 png_voidp s1, png_voidp s2, png_uint_32 size)); |
|
2111 |
|
2112 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, |
|
2113 png_voidp s1, int value, png_uint_32 size)); |
|
2114 |
|
2115 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ |
|
2116 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, |
|
2117 int check)); |
|
2118 #endif /* USE_FAR_KEYWORD */ |
|
2119 |
|
2120 #ifndef PNG_NO_ERROR_TEXT |
|
2121 /* Fatal error in PNG image of libpng - can't continue */ |
|
2122 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, |
|
2123 png_const_charp error_message)); |
|
2124 |
|
2125 /* The same, but the chunk name is prepended to the error string. */ |
|
2126 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, |
|
2127 png_const_charp error_message)); |
|
2128 #else |
|
2129 /* Fatal error in PNG image of libpng - can't continue */ |
|
2130 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)); |
|
2131 #endif |
|
2132 |
|
2133 #ifndef PNG_NO_WARNINGS |
|
2134 /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
|
2135 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, |
|
2136 png_const_charp warning_message)); |
|
2137 |
|
2138 #ifdef PNG_READ_SUPPORTED |
|
2139 /* Non-fatal error in libpng, chunk name is prepended to message. */ |
|
2140 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, |
|
2141 png_const_charp warning_message)); |
|
2142 #endif /* PNG_READ_SUPPORTED */ |
|
2143 #endif /* PNG_NO_WARNINGS */ |
|
2144 |
|
2145 /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
|
2146 * Similarly, the png_get_<chunk> calls are used to read values from the |
|
2147 * png_info_struct, either storing the parameters in the passed variables, or |
|
2148 * setting pointers into the png_info_struct where the data is stored. The |
|
2149 * png_get_<chunk> functions return a non-zero value if the data was available |
|
2150 * in info_ptr, or return zero and do not change any of the parameters if the |
|
2151 * data was not available. |
|
2152 * |
|
2153 * These functions should be used instead of directly accessing png_info |
|
2154 * to avoid problems with future changes in the size and internal layout of |
|
2155 * png_info_struct. |
|
2156 */ |
|
2157 /* Returns "flag" if chunk data is valid in info_ptr. */ |
|
2158 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, |
|
2159 png_infop info_ptr, png_uint_32 flag)); |
|
2160 |
|
2161 /* Returns number of bytes needed to hold a transformed row. */ |
|
2162 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, |
|
2163 png_infop info_ptr)); |
|
2164 |
|
2165 #if defined(PNG_INFO_IMAGE_SUPPORTED) |
|
2166 /* Returns row_pointers, which is an array of pointers to scanlines that was |
|
2167 returned from png_read_png(). */ |
|
2168 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, |
|
2169 png_infop info_ptr)); |
|
2170 /* Set row_pointers, which is an array of pointers to scanlines for use |
|
2171 by png_write_png(). */ |
|
2172 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, |
|
2173 png_infop info_ptr, png_bytepp row_pointers)); |
|
2174 #endif |
|
2175 |
|
2176 /* Returns number of color channels in image. */ |
|
2177 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, |
|
2178 png_infop info_ptr)); |
|
2179 |
|
2180 #ifdef PNG_EASY_ACCESS_SUPPORTED |
|
2181 /* Returns image width in pixels. */ |
|
2182 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp |
|
2183 png_ptr, png_infop info_ptr)); |
|
2184 |
|
2185 /* Returns image height in pixels. */ |
|
2186 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp |
|
2187 png_ptr, png_infop info_ptr)); |
|
2188 |
|
2189 /* Returns image bit_depth. */ |
|
2190 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp |
|
2191 png_ptr, png_infop info_ptr)); |
|
2192 |
|
2193 /* Returns image color_type. */ |
|
2194 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp |
|
2195 png_ptr, png_infop info_ptr)); |
|
2196 |
|
2197 /* Returns image filter_type. */ |
|
2198 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp |
|
2199 png_ptr, png_infop info_ptr)); |
|
2200 |
|
2201 /* Returns image interlace_type. */ |
|
2202 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp |
|
2203 png_ptr, png_infop info_ptr)); |
|
2204 |
|
2205 /* Returns image compression_type. */ |
|
2206 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp |
|
2207 png_ptr, png_infop info_ptr)); |
|
2208 |
|
2209 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
|
2210 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp |
|
2211 png_ptr, png_infop info_ptr)); |
|
2212 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp |
|
2213 png_ptr, png_infop info_ptr)); |
|
2214 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp |
|
2215 png_ptr, png_infop info_ptr)); |
|
2216 |
|
2217 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
|
2218 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
2219 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp |
|
2220 png_ptr, png_infop info_ptr)); |
|
2221 #endif |
|
2222 |
|
2223 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
|
2224 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp |
|
2225 png_ptr, png_infop info_ptr)); |
|
2226 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp |
|
2227 png_ptr, png_infop info_ptr)); |
|
2228 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp |
|
2229 png_ptr, png_infop info_ptr)); |
|
2230 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp |
|
2231 png_ptr, png_infop info_ptr)); |
|
2232 |
|
2233 #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
|
2234 |
|
2235 /* Returns pointer to signature string read from PNG header */ |
|
2236 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, |
|
2237 png_infop info_ptr)); |
|
2238 |
|
2239 #if defined(PNG_bKGD_SUPPORTED) |
|
2240 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, |
|
2241 png_infop info_ptr, png_color_16p *background)); |
|
2242 #endif |
|
2243 |
|
2244 #if defined(PNG_bKGD_SUPPORTED) |
|
2245 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, |
|
2246 png_infop info_ptr, png_color_16p background)); |
|
2247 #endif |
|
2248 |
|
2249 #if defined(PNG_cHRM_SUPPORTED) |
|
2250 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
2251 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, |
|
2252 png_infop info_ptr, double *white_x, double *white_y, double *red_x, |
|
2253 double *red_y, double *green_x, double *green_y, double *blue_x, |
|
2254 double *blue_y)); |
|
2255 #endif |
|
2256 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
2257 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, |
|
2258 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point |
|
2259 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, |
|
2260 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point |
|
2261 *int_blue_x, png_fixed_point *int_blue_y)); |
|
2262 #endif |
|
2263 #endif |
|
2264 |
|
2265 #if defined(PNG_cHRM_SUPPORTED) |
|
2266 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
2267 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, |
|
2268 png_infop info_ptr, double white_x, double white_y, double red_x, |
|
2269 double red_y, double green_x, double green_y, double blue_x, double blue_y)); |
|
2270 #endif |
|
2271 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
2272 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, |
|
2273 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, |
|
2274 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
|
2275 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
|
2276 png_fixed_point int_blue_y)); |
|
2277 #endif |
|
2278 #endif |
|
2279 |
|
2280 #if defined(PNG_gAMA_SUPPORTED) |
|
2281 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
2282 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, |
|
2283 png_infop info_ptr, double *file_gamma)); |
|
2284 #endif |
|
2285 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, |
|
2286 png_infop info_ptr, png_fixed_point *int_file_gamma)); |
|
2287 #endif |
|
2288 |
|
2289 #if defined(PNG_gAMA_SUPPORTED) |
|
2290 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
2291 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, |
|
2292 png_infop info_ptr, double file_gamma)); |
|
2293 #endif |
|
2294 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, |
|
2295 png_infop info_ptr, png_fixed_point int_file_gamma)); |
|
2296 #endif |
|
2297 |
|
2298 #if defined(PNG_hIST_SUPPORTED) |
|
2299 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, |
|
2300 png_infop info_ptr, png_uint_16p *hist)); |
|
2301 #endif |
|
2302 |
|
2303 #if defined(PNG_hIST_SUPPORTED) |
|
2304 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, |
|
2305 png_infop info_ptr, png_uint_16p hist)); |
|
2306 #endif |
|
2307 |
|
2308 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, |
|
2309 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, |
|
2310 int *bit_depth, int *color_type, int *interlace_method, |
|
2311 int *compression_method, int *filter_method)); |
|
2312 |
|
2313 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, |
|
2314 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
|
2315 int color_type, int interlace_method, int compression_method, |
|
2316 int filter_method)); |
|
2317 |
|
2318 #if defined(PNG_oFFs_SUPPORTED) |
|
2319 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, |
|
2320 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
|
2321 int *unit_type)); |
|
2322 #endif |
|
2323 |
|
2324 #if defined(PNG_oFFs_SUPPORTED) |
|
2325 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, |
|
2326 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
|
2327 int unit_type)); |
|
2328 #endif |
|
2329 |
|
2330 #if defined(PNG_pCAL_SUPPORTED) |
|
2331 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, |
|
2332 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, |
|
2333 int *type, int *nparams, png_charp *units, png_charpp *params)); |
|
2334 #endif |
|
2335 |
|
2336 #if defined(PNG_pCAL_SUPPORTED) |
|
2337 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, |
|
2338 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, |
|
2339 int type, int nparams, png_charp units, png_charpp params)); |
|
2340 #endif |
|
2341 |
|
2342 #if defined(PNG_pHYs_SUPPORTED) |
|
2343 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, |
|
2344 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
|
2345 #endif |
|
2346 |
|
2347 #if defined(PNG_pHYs_SUPPORTED) |
|
2348 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, |
|
2349 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
|
2350 #endif |
|
2351 |
|
2352 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, |
|
2353 png_infop info_ptr, png_colorp *palette, int *num_palette)); |
|
2354 |
|
2355 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, |
|
2356 png_infop info_ptr, png_colorp palette, int num_palette)); |
|
2357 |
|
2358 #if defined(PNG_sBIT_SUPPORTED) |
|
2359 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, |
|
2360 png_infop info_ptr, png_color_8p *sig_bit)); |
|
2361 #endif |
|
2362 |
|
2363 #if defined(PNG_sBIT_SUPPORTED) |
|
2364 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, |
|
2365 png_infop info_ptr, png_color_8p sig_bit)); |
|
2366 #endif |
|
2367 |
|
2368 #if defined(PNG_sRGB_SUPPORTED) |
|
2369 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, |
|
2370 png_infop info_ptr, int *intent)); |
|
2371 #endif |
|
2372 |
|
2373 #if defined(PNG_sRGB_SUPPORTED) |
|
2374 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, |
|
2375 png_infop info_ptr, int intent)); |
|
2376 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, |
|
2377 png_infop info_ptr, int intent)); |
|
2378 #endif |
|
2379 |
|
2380 #if defined(PNG_iCCP_SUPPORTED) |
|
2381 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, |
|
2382 png_infop info_ptr, png_charpp name, int *compression_type, |
|
2383 png_charpp profile, png_uint_32 *proflen)); |
|
2384 /* Note to maintainer: profile should be png_bytepp */ |
|
2385 #endif |
|
2386 |
|
2387 #if defined(PNG_iCCP_SUPPORTED) |
|
2388 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, |
|
2389 png_infop info_ptr, png_charp name, int compression_type, |
|
2390 png_charp profile, png_uint_32 proflen)); |
|
2391 /* Note to maintainer: profile should be png_bytep */ |
|
2392 #endif |
|
2393 |
|
2394 #if defined(PNG_sPLT_SUPPORTED) |
|
2395 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, |
|
2396 png_infop info_ptr, png_sPLT_tpp entries)); |
|
2397 #endif |
|
2398 |
|
2399 #if defined(PNG_sPLT_SUPPORTED) |
|
2400 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, |
|
2401 png_infop info_ptr, png_sPLT_tp entries, int nentries)); |
|
2402 #endif |
|
2403 |
|
2404 #if defined(PNG_TEXT_SUPPORTED) |
|
2405 /* png_get_text also returns the number of text chunks in *num_text */ |
|
2406 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, |
|
2407 png_infop info_ptr, png_textp *text_ptr, int *num_text)); |
|
2408 #endif |
|
2409 |
|
2410 /* |
|
2411 * Note while png_set_text() will accept a structure whose text, |
|
2412 * language, and translated keywords are NULL pointers, the structure |
|
2413 * returned by png_get_text will always contain regular |
|
2414 * zero-terminated C strings. They might be empty strings but |
|
2415 * they will never be NULL pointers. |
|
2416 */ |
|
2417 |
|
2418 #if defined(PNG_TEXT_SUPPORTED) |
|
2419 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, |
|
2420 png_infop info_ptr, png_textp text_ptr, int num_text)); |
|
2421 #endif |
|
2422 |
|
2423 #if defined(PNG_tIME_SUPPORTED) |
|
2424 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, |
|
2425 png_infop info_ptr, png_timep *mod_time)); |
|
2426 #endif |
|
2427 |
|
2428 #if defined(PNG_tIME_SUPPORTED) |
|
2429 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, |
|
2430 png_infop info_ptr, png_timep mod_time)); |
|
2431 #endif |
|
2432 |
|
2433 #if defined(PNG_tRNS_SUPPORTED) |
|
2434 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, |
|
2435 png_infop info_ptr, png_bytep *trans, int *num_trans, |
|
2436 png_color_16p *trans_values)); |
|
2437 #endif |
|
2438 |
|
2439 #if defined(PNG_tRNS_SUPPORTED) |
|
2440 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, |
|
2441 png_infop info_ptr, png_bytep trans, int num_trans, |
|
2442 png_color_16p trans_values)); |
|
2443 #endif |
|
2444 |
|
2445 #if defined(PNG_tRNS_SUPPORTED) |
|
2446 #endif |
|
2447 |
|
2448 #if defined(PNG_sCAL_SUPPORTED) |
|
2449 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
2450 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, |
|
2451 png_infop info_ptr, int *unit, double *width, double *height)); |
|
2452 #else |
|
2453 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
2454 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, |
|
2455 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); |
|
2456 #endif |
|
2457 #endif |
|
2458 #endif /* PNG_sCAL_SUPPORTED */ |
|
2459 |
|
2460 #if defined(PNG_sCAL_SUPPORTED) |
|
2461 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
2462 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, |
|
2463 png_infop info_ptr, int unit, double width, double height)); |
|
2464 #else |
|
2465 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
2466 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, |
|
2467 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); |
|
2468 #endif |
|
2469 #endif |
|
2470 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ |
|
2471 |
|
2472 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
|
2473 /* provide a list of chunks and how they are to be handled, if the built-in |
|
2474 handling or default unknown chunk handling is not desired. Any chunks not |
|
2475 listed will be handled in the default manner. The IHDR and IEND chunks |
|
2476 must not be listed. |
|
2477 keep = 0: follow default behaviour |
|
2478 = 1: do not keep |
|
2479 = 2: keep only if safe-to-copy |
|
2480 = 3: keep even if unsafe-to-copy |
|
2481 */ |
|
2482 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp |
|
2483 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); |
|
2484 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, |
|
2485 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); |
|
2486 extern PNG_EXPORT(void, png_set_unknown_chunk_location) |
|
2487 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); |
|
2488 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp |
|
2489 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); |
|
2490 #endif |
|
2491 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
|
2492 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep |
|
2493 chunk_name)); |
|
2494 #endif |
|
2495 |
|
2496 /* Png_free_data() will turn off the "valid" flag for anything it frees. |
|
2497 If you need to turn it off for a chunk that your application has freed, |
|
2498 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ |
|
2499 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, |
|
2500 png_infop info_ptr, int mask)); |
|
2501 |
|
2502 #if defined(PNG_INFO_IMAGE_SUPPORTED) |
|
2503 /* The "params" pointer is currently not used and is for future expansion. */ |
|
2504 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, |
|
2505 png_infop info_ptr, |
|
2506 int transforms, |
|
2507 png_voidp params)); |
|
2508 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, |
|
2509 png_infop info_ptr, |
|
2510 int transforms, |
|
2511 png_voidp params)); |
|
2512 #endif |
|
2513 |
|
2514 /* Define PNG_DEBUG at compile time for debugging information. Higher |
|
2515 * numbers for PNG_DEBUG mean more debugging information. This has |
|
2516 * only been added since version 0.95 so it is not implemented throughout |
|
2517 * libpng yet, but more support will be added as needed. |
|
2518 */ |
|
2519 #ifdef PNG_DEBUG |
|
2520 #if (PNG_DEBUG > 0) |
|
2521 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) |
|
2522 #include <crtdbg.h> |
|
2523 #if (PNG_DEBUG > 1) |
|
2524 #define png_debug(l,m) _RPT0(_CRT_WARN,m) |
|
2525 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) |
|
2526 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) |
|
2527 #endif |
|
2528 #else /* PNG_DEBUG_FILE || !_MSC_VER */ |
|
2529 #ifndef PNG_DEBUG_FILE |
|
2530 #define PNG_DEBUG_FILE stderr |
|
2531 #endif /* PNG_DEBUG_FILE */ |
|
2532 #if (PNG_DEBUG > 1) |
|
2533 #define png_debug(l,m) \ |
|
2534 { \ |
|
2535 int num_tabs=l; \ |
|
2536 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
|
2537 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ |
|
2538 } |
|
2539 #define png_debug1(l,m,p1) \ |
|
2540 { \ |
|
2541 int num_tabs=l; \ |
|
2542 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
|
2543 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ |
|
2544 } |
|
2545 #define png_debug2(l,m,p1,p2) \ |
|
2546 { \ |
|
2547 int num_tabs=l; \ |
|
2548 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
|
2549 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ |
|
2550 } |
|
2551 #endif /* (PNG_DEBUG > 1) */ |
|
2552 #endif /* _MSC_VER */ |
|
2553 #endif /* (PNG_DEBUG > 0) */ |
|
2554 #endif /* PNG_DEBUG */ |
|
2555 #ifndef png_debug |
|
2556 #define png_debug(l, m) |
|
2557 #endif |
|
2558 #ifndef png_debug1 |
|
2559 #define png_debug1(l, m, p1) |
|
2560 #endif |
|
2561 #ifndef png_debug2 |
|
2562 #define png_debug2(l, m, p1, p2) |
|
2563 #endif |
|
2564 |
|
2565 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); |
|
2566 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); |
|
2567 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); |
|
2568 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); |
|
2569 |
|
2570 #ifdef PNG_MNG_FEATURES_SUPPORTED |
|
2571 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp |
|
2572 png_ptr, png_uint_32 mng_features_permitted)); |
|
2573 #endif |
|
2574 |
|
2575 /* For use in png_set_keep_unknown, added to version 1.2.6 */ |
|
2576 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 |
|
2577 #define PNG_HANDLE_CHUNK_NEVER 1 |
|
2578 #define PNG_HANDLE_CHUNK_IF_SAFE 2 |
|
2579 #define PNG_HANDLE_CHUNK_ALWAYS 3 |
|
2580 |
|
2581 /* Added to version 1.2.0 */ |
|
2582 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
|
2583 #if defined(PNG_MMX_CODE_SUPPORTED) |
|
2584 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ |
|
2585 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ |
|
2586 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 |
|
2587 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 |
|
2588 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 |
|
2589 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 |
|
2590 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 |
|
2591 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 |
|
2592 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ |
|
2593 |
|
2594 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ |
|
2595 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ |
|
2596 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ |
|
2597 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ |
|
2598 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ |
|
2599 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) |
|
2600 #define PNG_MMX_WRITE_FLAGS ( 0 ) |
|
2601 |
|
2602 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ |
|
2603 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ |
|
2604 | PNG_MMX_READ_FLAGS \ |
|
2605 | PNG_MMX_WRITE_FLAGS ) |
|
2606 |
|
2607 #define PNG_SELECT_READ 1 |
|
2608 #define PNG_SELECT_WRITE 2 |
|
2609 #endif /* PNG_MMX_CODE_SUPPORTED */ |
|
2610 |
|
2611 #if !defined(PNG_1_0_X) |
|
2612 /* pngget.c */ |
|
2613 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) |
|
2614 PNGARG((int flag_select, int *compilerID)); |
|
2615 |
|
2616 /* pngget.c */ |
|
2617 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) |
|
2618 PNGARG((int flag_select)); |
|
2619 |
|
2620 /* pngget.c */ |
|
2621 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) |
|
2622 PNGARG((png_structp png_ptr)); |
|
2623 |
|
2624 /* pngget.c */ |
|
2625 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) |
|
2626 PNGARG((png_structp png_ptr)); |
|
2627 |
|
2628 /* pngget.c */ |
|
2629 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) |
|
2630 PNGARG((png_structp png_ptr)); |
|
2631 |
|
2632 /* pngset.c */ |
|
2633 extern PNG_EXPORT(void,png_set_asm_flags) |
|
2634 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); |
|
2635 |
|
2636 /* pngset.c */ |
|
2637 extern PNG_EXPORT(void,png_set_mmx_thresholds) |
|
2638 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, |
|
2639 png_uint_32 mmx_rowbytes_threshold)); |
|
2640 |
|
2641 #endif /* PNG_1_0_X */ |
|
2642 |
|
2643 #if !defined(PNG_1_0_X) |
|
2644 /* png.c, pnggccrd.c, or pngvcrd.c */ |
|
2645 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); |
|
2646 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ |
|
2647 |
|
2648 /* Strip the prepended error numbers ("#nnn ") from error and warning |
|
2649 * messages before passing them to the error or warning handler. */ |
|
2650 #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
|
2651 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp |
|
2652 png_ptr, png_uint_32 strip_mode)); |
|
2653 #endif |
|
2654 |
|
2655 #endif /* PNG_1_0_X */ |
|
2656 |
|
2657 /* Added at libpng-1.2.6 */ |
|
2658 #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
|
2659 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp |
|
2660 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); |
|
2661 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp |
|
2662 png_ptr)); |
|
2663 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp |
|
2664 png_ptr)); |
|
2665 #endif |
|
2666 |
|
2667 |
|
2668 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ |
|
2669 |
|
2670 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
|
2671 /* With these routines we avoid an integer divide, which will be slower on |
|
2672 * most machines. However, it does take more operations than the corresponding |
|
2673 * divide method, so it may be slower on a few RISC systems. There are two |
|
2674 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
|
2675 * |
|
2676 * Note that the rounding factors are NOT supposed to be the same! 128 and |
|
2677 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
|
2678 * standard method. |
|
2679 * |
|
2680 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
|
2681 */ |
|
2682 |
|
2683 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
|
2684 |
|
2685 # define png_composite(composite, fg, alpha, bg) \ |
|
2686 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ |
|
2687 + (png_uint_16)(bg)*(png_uint_16)(255 - \ |
|
2688 (png_uint_16)(alpha)) + (png_uint_16)128); \ |
|
2689 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
|
2690 |
|
2691 # define png_composite_16(composite, fg, alpha, bg) \ |
|
2692 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ |
|
2693 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ |
|
2694 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ |
|
2695 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
|
2696 |
|
2697 #else /* standard method using integer division */ |
|
2698 |
|
2699 # define png_composite(composite, fg, alpha, bg) \ |
|
2700 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
|
2701 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
|
2702 (png_uint_16)127) / 255) |
|
2703 |
|
2704 # define png_composite_16(composite, fg, alpha, bg) \ |
|
2705 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
|
2706 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ |
|
2707 (png_uint_32)32767) / (png_uint_32)65535L) |
|
2708 |
|
2709 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
|
2710 |
|
2711 /* Inline macros to do direct reads of bytes from the input buffer. These |
|
2712 * require that you are using an architecture that uses PNG byte ordering |
|
2713 * (MSB first) and supports unaligned data storage. I think that PowerPC |
|
2714 * in big-endian mode and 680x0 are the only ones that will support this. |
|
2715 * The x86 line of processors definitely do not. The png_get_int_32() |
|
2716 * routine also assumes we are using two's complement format for negative |
|
2717 * values, which is almost certainly true. |
|
2718 */ |
|
2719 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) |
|
2720 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) |
|
2721 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) |
|
2722 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) |
|
2723 #else |
|
2724 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); |
|
2725 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); |
|
2726 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); |
|
2727 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ |
|
2728 extern PNG_EXPORT(png_uint_32,png_get_uint_31) |
|
2729 PNGARG((png_structp png_ptr, png_bytep buf)); |
|
2730 /* No png_get_int_16 -- may be added if there's a real need for it. */ |
|
2731 |
|
2732 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). |
|
2733 */ |
|
2734 extern PNG_EXPORT(void,png_save_uint_32) |
|
2735 PNGARG((png_bytep buf, png_uint_32 i)); |
|
2736 extern PNG_EXPORT(void,png_save_int_32) |
|
2737 PNGARG((png_bytep buf, png_int_32 i)); |
|
2738 |
|
2739 /* Place a 16-bit number into a buffer in PNG byte order. |
|
2740 * The parameter is declared unsigned int, not png_uint_16, |
|
2741 * just to avoid potential problems on pre-ANSI C compilers. |
|
2742 */ |
|
2743 extern PNG_EXPORT(void,png_save_uint_16) |
|
2744 PNGARG((png_bytep buf, unsigned int i)); |
|
2745 /* No png_save_int_16 -- may be added if there's a real need for it. */ |
|
2746 |
|
2747 /* ************************************************************************* */ |
|
2748 |
|
2749 /* These next functions are used internally in the code. They generally |
|
2750 * shouldn't be used unless you are writing code to add or replace some |
|
2751 * functionality in libpng. More information about most functions can |
|
2752 * be found in the files where the functions are located. |
|
2753 */ |
|
2754 |
|
2755 |
|
2756 /* Various modes of operation, that are visible to applications because |
|
2757 * they are used for unknown chunk location. |
|
2758 */ |
|
2759 #define PNG_HAVE_IHDR 0x01 |
|
2760 #define PNG_HAVE_PLTE 0x02 |
|
2761 #define PNG_HAVE_IDAT 0x04 |
|
2762 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ |
|
2763 #define PNG_HAVE_IEND 0x10 |
|
2764 |
|
2765 #if defined(PNG_INTERNAL) |
|
2766 |
|
2767 /* More modes of operation. Note that after an init, mode is set to |
|
2768 * zero automatically when the structure is created. |
|
2769 */ |
|
2770 #define PNG_HAVE_gAMA 0x20 |
|
2771 #define PNG_HAVE_cHRM 0x40 |
|
2772 #define PNG_HAVE_sRGB 0x80 |
|
2773 #define PNG_HAVE_CHUNK_HEADER 0x100 |
|
2774 #define PNG_WROTE_tIME 0x200 |
|
2775 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
|
2776 #define PNG_BACKGROUND_IS_GRAY 0x800 |
|
2777 #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
|
2778 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
|
2779 |
|
2780 /* flags for the transformations the PNG library does on the image data */ |
|
2781 #define PNG_BGR 0x0001 |
|
2782 #define PNG_INTERLACE 0x0002 |
|
2783 #define PNG_PACK 0x0004 |
|
2784 #define PNG_SHIFT 0x0008 |
|
2785 #define PNG_SWAP_BYTES 0x0010 |
|
2786 #define PNG_INVERT_MONO 0x0020 |
|
2787 #define PNG_DITHER 0x0040 |
|
2788 #define PNG_BACKGROUND 0x0080 |
|
2789 #define PNG_BACKGROUND_EXPAND 0x0100 |
|
2790 /* 0x0200 unused */ |
|
2791 #define PNG_16_TO_8 0x0400 |
|
2792 #define PNG_RGBA 0x0800 |
|
2793 #define PNG_EXPAND 0x1000 |
|
2794 #define PNG_GAMMA 0x2000 |
|
2795 #define PNG_GRAY_TO_RGB 0x4000 |
|
2796 #define PNG_FILLER 0x8000L |
|
2797 #define PNG_PACKSWAP 0x10000L |
|
2798 #define PNG_SWAP_ALPHA 0x20000L |
|
2799 #define PNG_STRIP_ALPHA 0x40000L |
|
2800 #define PNG_INVERT_ALPHA 0x80000L |
|
2801 #define PNG_USER_TRANSFORM 0x100000L |
|
2802 #define PNG_RGB_TO_GRAY_ERR 0x200000L |
|
2803 #define PNG_RGB_TO_GRAY_WARN 0x400000L |
|
2804 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ |
|
2805 /* 0x800000L Unused */ |
|
2806 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ |
|
2807 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ |
|
2808 /* 0x4000000L unused */ |
|
2809 /* 0x8000000L unused */ |
|
2810 /* 0x10000000L unused */ |
|
2811 /* 0x20000000L unused */ |
|
2812 /* 0x40000000L unused */ |
|
2813 |
|
2814 /* flags for png_create_struct */ |
|
2815 #define PNG_STRUCT_PNG 0x0001 |
|
2816 #define PNG_STRUCT_INFO 0x0002 |
|
2817 |
|
2818 /* Scaling factor for filter heuristic weighting calculations */ |
|
2819 #define PNG_WEIGHT_SHIFT 8 |
|
2820 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
|
2821 #define PNG_COST_SHIFT 3 |
|
2822 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
|
2823 |
|
2824 /* flags for the png_ptr->flags rather than declaring a byte for each one */ |
|
2825 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
|
2826 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
|
2827 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
|
2828 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
|
2829 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
|
2830 #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
|
2831 #define PNG_FLAG_ROW_INIT 0x0040 |
|
2832 #define PNG_FLAG_FILLER_AFTER 0x0080 |
|
2833 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
|
2834 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
|
2835 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
|
2836 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
|
2837 #define PNG_FLAG_FREE_PLTE 0x1000 |
|
2838 #define PNG_FLAG_FREE_TRNS 0x2000 |
|
2839 #define PNG_FLAG_FREE_HIST 0x4000 |
|
2840 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L |
|
2841 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L |
|
2842 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L |
|
2843 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L |
|
2844 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L |
|
2845 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L |
|
2846 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ |
|
2847 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ |
|
2848 /* 0x800000L unused */ |
|
2849 /* 0x1000000L unused */ |
|
2850 /* 0x2000000L unused */ |
|
2851 /* 0x4000000L unused */ |
|
2852 /* 0x8000000L unused */ |
|
2853 /* 0x10000000L unused */ |
|
2854 /* 0x20000000L unused */ |
|
2855 /* 0x40000000L unused */ |
|
2856 |
|
2857 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
|
2858 PNG_FLAG_CRC_ANCILLARY_NOWARN) |
|
2859 |
|
2860 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
|
2861 PNG_FLAG_CRC_CRITICAL_IGNORE) |
|
2862 |
|
2863 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
|
2864 PNG_FLAG_CRC_CRITICAL_MASK) |
|
2865 |
|
2866 /* save typing and make code easier to understand */ |
|
2867 |
|
2868 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
|
2869 abs((int)((c1).green) - (int)((c2).green)) + \ |
|
2870 abs((int)((c1).blue) - (int)((c2).blue))) |
|
2871 |
|
2872 /* Added to libpng-1.2.6 JB */ |
|
2873 #define PNG_ROWBYTES(pixel_bits, width) \ |
|
2874 ((pixel_bits) >= 8 ? \ |
|
2875 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ |
|
2876 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) |
|
2877 |
|
2878 /* PNG_OUT_OF_RANGE returns true if value is outside the range |
|
2879 ideal-delta..ideal+delta. Each argument is evaluated twice. |
|
2880 "ideal" and "delta" should be constants, normally simple |
|
2881 integers, "value" a variable. Added to libpng-1.2.6 JB */ |
|
2882 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
|
2883 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
|
2884 |
|
2885 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
|
2886 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
|
2887 /* place to hold the signature string for a PNG file. */ |
|
2888 #ifdef PNG_USE_GLOBAL_ARRAYS |
|
2889 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; |
|
2890 #else |
|
2891 #endif |
|
2892 #endif /* PNG_NO_EXTERN */ |
|
2893 |
|
2894 /* Constant strings for known chunk types. If you need to add a chunk, |
|
2895 * define the name here, and add an invocation of the macro in png.c and |
|
2896 * wherever it's needed. |
|
2897 */ |
|
2898 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} |
|
2899 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} |
|
2900 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} |
|
2901 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} |
|
2902 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} |
|
2903 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} |
|
2904 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} |
|
2905 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} |
|
2906 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} |
|
2907 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} |
|
2908 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} |
|
2909 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} |
|
2910 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} |
|
2911 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} |
|
2912 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} |
|
2913 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} |
|
2914 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} |
|
2915 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} |
|
2916 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} |
|
2917 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} |
|
2918 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} |
|
2919 |
|
2920 #ifdef PNG_USE_GLOBAL_ARRAYS |
|
2921 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; |
|
2922 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; |
|
2923 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; |
|
2924 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; |
|
2925 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; |
|
2926 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; |
|
2927 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; |
|
2928 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; |
|
2929 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; |
|
2930 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; |
|
2931 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; |
|
2932 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; |
|
2933 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; |
|
2934 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; |
|
2935 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; |
|
2936 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; |
|
2937 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; |
|
2938 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; |
|
2939 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; |
|
2940 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; |
|
2941 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; |
|
2942 #endif /* PNG_USE_GLOBAL_ARRAYS */ |
|
2943 |
|
2944 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
|
2945 /* Initialize png_ptr struct for reading, and allocate any other memory. |
|
2946 * (old interface - DEPRECATED - use png_create_read_struct instead). |
|
2947 */ |
|
2948 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); |
|
2949 #undef png_read_init |
|
2950 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ |
|
2951 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); |
|
2952 #endif |
|
2953 |
|
2954 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, |
|
2955 png_const_charp user_png_ver, png_size_t png_struct_size)); |
|
2956 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
|
2957 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, |
|
2958 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
|
2959 png_info_size)); |
|
2960 #endif |
|
2961 |
|
2962 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
|
2963 /* Initialize png_ptr struct for writing, and allocate any other memory. |
|
2964 * (old interface - DEPRECATED - use png_create_write_struct instead). |
|
2965 */ |
|
2966 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); |
|
2967 #undef png_write_init |
|
2968 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ |
|
2969 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); |
|
2970 #endif |
|
2971 |
|
2972 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, |
|
2973 png_const_charp user_png_ver, png_size_t png_struct_size)); |
|
2974 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, |
|
2975 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
|
2976 png_info_size)); |
|
2977 |
|
2978 /* Allocate memory for an internal libpng struct */ |
|
2979 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); |
|
2980 |
|
2981 /* Free memory from internal libpng struct */ |
|
2982 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
|
2983 |
|
2984 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr |
|
2985 malloc_fn, png_voidp mem_ptr)); |
|
2986 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
|
2987 png_free_ptr free_fn, png_voidp mem_ptr)); |
|
2988 |
|
2989 /* Free any memory that info_ptr points to and reset struct. */ |
|
2990 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
|
2991 png_infop info_ptr)); |
|
2992 |
|
2993 #ifndef PNG_1_0_X |
|
2994 /* Function to allocate memory for zlib. */ |
|
2995 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); |
|
2996 |
|
2997 /* Function to free memory for zlib */ |
|
2998 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
|
2999 |
|
3000 #ifdef PNG_SIZE_T |
|
3001 /* Function to convert a sizeof an item to png_sizeof item */ |
|
3002 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); |
|
3003 #endif |
|
3004 |
|
3005 /* Next four functions are used internally as callbacks. PNGAPI is required |
|
3006 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ |
|
3007 |
|
3008 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, |
|
3009 png_bytep data, png_size_t length)); |
|
3010 |
|
3011 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
3012 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, |
|
3013 png_bytep buffer, png_size_t length)); |
|
3014 #endif |
|
3015 |
|
3016 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, |
|
3017 png_bytep data, png_size_t length)); |
|
3018 |
|
3019 #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
|
3020 #if !defined(PNG_NO_STDIO) |
|
3021 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); |
|
3022 #endif |
|
3023 #endif |
|
3024 #else /* PNG_1_0_X */ |
|
3025 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
3026 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, |
|
3027 png_bytep buffer, png_size_t length)); |
|
3028 #endif |
|
3029 #endif /* PNG_1_0_X */ |
|
3030 |
|
3031 /* Reset the CRC variable */ |
|
3032 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
|
3033 |
|
3034 /* Write the "data" buffer to whatever output you are using. */ |
|
3035 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, |
|
3036 png_size_t length)); |
|
3037 |
|
3038 /* Read data from whatever input you are using into the "data" buffer */ |
|
3039 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
|
3040 png_size_t length)); |
|
3041 |
|
3042 /* Read bytes into buf, and update png_ptr->crc */ |
|
3043 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
|
3044 png_size_t length)); |
|
3045 |
|
3046 /* Decompress data in a chunk that uses compression */ |
|
3047 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ |
|
3048 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) |
|
3049 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, |
|
3050 int comp_type, png_size_t chunklength, |
|
3051 png_size_t prefix_length, png_size_t *data_length)); |
|
3052 #endif |
|
3053 |
|
3054 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
|
3055 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
|
3056 |
|
3057 /* Read the CRC from the file and compare it to the libpng calculated CRC */ |
|
3058 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
|
3059 |
|
3060 /* Calculate the CRC over a section of data. Note that we are only |
|
3061 * passing a maximum of 64K on systems that have this as a memory limit, |
|
3062 * since this is the maximum buffer size we can specify. |
|
3063 */ |
|
3064 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, |
|
3065 png_size_t length)); |
|
3066 |
|
3067 #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
|
3068 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
|
3069 #endif |
|
3070 |
|
3071 /* simple function to write the signature */ |
|
3072 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); |
|
3073 |
|
3074 /* write various chunks */ |
|
3075 |
|
3076 /* Write the IHDR chunk, and update the png_struct with the necessary |
|
3077 * information. |
|
3078 */ |
|
3079 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
|
3080 png_uint_32 height, |
|
3081 int bit_depth, int color_type, int compression_method, int filter_method, |
|
3082 int interlace_method)); |
|
3083 |
|
3084 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, |
|
3085 png_uint_32 num_pal)); |
|
3086 |
|
3087 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
|
3088 png_size_t length)); |
|
3089 |
|
3090 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
|
3091 |
|
3092 #if defined(PNG_WRITE_gAMA_SUPPORTED) |
|
3093 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
3094 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
|
3095 #endif |
|
3096 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
3097 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point |
|
3098 file_gamma)); |
|
3099 #endif |
|
3100 #endif |
|
3101 |
|
3102 #if defined(PNG_WRITE_sBIT_SUPPORTED) |
|
3103 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, |
|
3104 int color_type)); |
|
3105 #endif |
|
3106 |
|
3107 #if defined(PNG_WRITE_cHRM_SUPPORTED) |
|
3108 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
3109 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
|
3110 double white_x, double white_y, |
|
3111 double red_x, double red_y, double green_x, double green_y, |
|
3112 double blue_x, double blue_y)); |
|
3113 #endif |
|
3114 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
3115 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
|
3116 png_fixed_point int_white_x, png_fixed_point int_white_y, |
|
3117 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
|
3118 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
|
3119 png_fixed_point int_blue_y)); |
|
3120 #endif |
|
3121 #endif |
|
3122 |
|
3123 #if defined(PNG_WRITE_sRGB_SUPPORTED) |
|
3124 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
|
3125 int intent)); |
|
3126 #endif |
|
3127 |
|
3128 #if defined(PNG_WRITE_iCCP_SUPPORTED) |
|
3129 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
|
3130 png_charp name, int compression_type, |
|
3131 png_charp profile, int proflen)); |
|
3132 /* Note to maintainer: profile should be png_bytep */ |
|
3133 #endif |
|
3134 |
|
3135 #if defined(PNG_WRITE_sPLT_SUPPORTED) |
|
3136 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
|
3137 png_sPLT_tp palette)); |
|
3138 #endif |
|
3139 |
|
3140 #if defined(PNG_WRITE_tRNS_SUPPORTED) |
|
3141 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, |
|
3142 png_color_16p values, int number, int color_type)); |
|
3143 #endif |
|
3144 |
|
3145 #if defined(PNG_WRITE_bKGD_SUPPORTED) |
|
3146 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
|
3147 png_color_16p values, int color_type)); |
|
3148 #endif |
|
3149 |
|
3150 #if defined(PNG_WRITE_hIST_SUPPORTED) |
|
3151 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, |
|
3152 int num_hist)); |
|
3153 #endif |
|
3154 |
|
3155 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
|
3156 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
|
3157 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
|
3158 png_charp key, png_charpp new_key)); |
|
3159 #endif |
|
3160 |
|
3161 #if defined(PNG_WRITE_tEXt_SUPPORTED) |
|
3162 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, |
|
3163 png_charp text, png_size_t text_len)); |
|
3164 #endif |
|
3165 |
|
3166 #if defined(PNG_WRITE_zTXt_SUPPORTED) |
|
3167 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, |
|
3168 png_charp text, png_size_t text_len, int compression)); |
|
3169 #endif |
|
3170 |
|
3171 #if defined(PNG_WRITE_iTXt_SUPPORTED) |
|
3172 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
|
3173 int compression, png_charp key, png_charp lang, png_charp lang_key, |
|
3174 png_charp text)); |
|
3175 #endif |
|
3176 |
|
3177 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ |
|
3178 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, |
|
3179 png_infop info_ptr, png_textp text_ptr, int num_text)); |
|
3180 #endif |
|
3181 |
|
3182 #if defined(PNG_WRITE_oFFs_SUPPORTED) |
|
3183 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
|
3184 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
|
3185 #endif |
|
3186 |
|
3187 #if defined(PNG_WRITE_pCAL_SUPPORTED) |
|
3188 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
|
3189 png_int_32 X0, png_int_32 X1, int type, int nparams, |
|
3190 png_charp units, png_charpp params)); |
|
3191 #endif |
|
3192 |
|
3193 #if defined(PNG_WRITE_pHYs_SUPPORTED) |
|
3194 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
|
3195 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
|
3196 int unit_type)); |
|
3197 #endif |
|
3198 |
|
3199 #if defined(PNG_WRITE_tIME_SUPPORTED) |
|
3200 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
|
3201 png_timep mod_time)); |
|
3202 #endif |
|
3203 |
|
3204 #if defined(PNG_WRITE_sCAL_SUPPORTED) |
|
3205 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) |
|
3206 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, |
|
3207 int unit, double width, double height)); |
|
3208 #else |
|
3209 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
3210 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
|
3211 int unit, png_charp width, png_charp height)); |
|
3212 #endif |
|
3213 #endif |
|
3214 #endif |
|
3215 |
|
3216 /* Called when finished processing a row of data */ |
|
3217 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
|
3218 |
|
3219 /* Internal use only. Called before first row of data */ |
|
3220 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
|
3221 |
|
3222 #if defined(PNG_READ_GAMMA_SUPPORTED) |
|
3223 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); |
|
3224 #endif |
|
3225 |
|
3226 /* combine a row of data, dealing with alpha, etc. if requested */ |
|
3227 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
|
3228 int mask)); |
|
3229 |
|
3230 #if defined(PNG_READ_INTERLACING_SUPPORTED) |
|
3231 /* expand an interlaced row */ |
|
3232 /* OLD pre-1.0.9 interface: |
|
3233 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
|
3234 png_bytep row, int pass, png_uint_32 transformations)); |
|
3235 */ |
|
3236 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); |
|
3237 #endif |
|
3238 |
|
3239 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
|
3240 |
|
3241 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
|
3242 /* grab pixels out of a row for an interlaced pass */ |
|
3243 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
|
3244 png_bytep row, int pass)); |
|
3245 #endif |
|
3246 |
|
3247 /* unfilter a row */ |
|
3248 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
|
3249 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); |
|
3250 |
|
3251 /* Choose the best filter to use and filter the row data */ |
|
3252 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
|
3253 png_row_infop row_info)); |
|
3254 |
|
3255 /* Write out the filtered row. */ |
|
3256 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
|
3257 png_bytep filtered_row)); |
|
3258 /* finish a row while reading, dealing with interlacing passes, etc. */ |
|
3259 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
|
3260 |
|
3261 /* initialize the row buffers, etc. */ |
|
3262 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
|
3263 /* optional call to update the users info structure */ |
|
3264 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
|
3265 png_infop info_ptr)); |
|
3266 |
|
3267 /* these are the functions that do the transformations */ |
|
3268 #if defined(PNG_READ_FILLER_SUPPORTED) |
|
3269 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
|
3270 png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
|
3271 #endif |
|
3272 |
|
3273 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
|
3274 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
|
3275 png_bytep row)); |
|
3276 #endif |
|
3277 |
|
3278 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
|
3279 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
|
3280 png_bytep row)); |
|
3281 #endif |
|
3282 |
|
3283 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
|
3284 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
|
3285 png_bytep row)); |
|
3286 #endif |
|
3287 |
|
3288 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
|
3289 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
|
3290 png_bytep row)); |
|
3291 #endif |
|
3292 |
|
3293 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
|
3294 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
|
3295 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
|
3296 png_bytep row, png_uint_32 flags)); |
|
3297 #endif |
|
3298 |
|
3299 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
|
3300 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); |
|
3301 #endif |
|
3302 |
|
3303 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
|
3304 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); |
|
3305 #endif |
|
3306 |
|
3307 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
|
3308 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop |
|
3309 row_info, png_bytep row)); |
|
3310 #endif |
|
3311 |
|
3312 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
|
3313 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
|
3314 png_bytep row)); |
|
3315 #endif |
|
3316 |
|
3317 #if defined(PNG_READ_PACK_SUPPORTED) |
|
3318 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); |
|
3319 #endif |
|
3320 |
|
3321 #if defined(PNG_READ_SHIFT_SUPPORTED) |
|
3322 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, |
|
3323 png_color_8p sig_bits)); |
|
3324 #endif |
|
3325 |
|
3326 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
|
3327 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); |
|
3328 #endif |
|
3329 |
|
3330 #if defined(PNG_READ_16_TO_8_SUPPORTED) |
|
3331 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); |
|
3332 #endif |
|
3333 |
|
3334 #if defined(PNG_READ_DITHER_SUPPORTED) |
|
3335 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, |
|
3336 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); |
|
3337 |
|
3338 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) |
|
3339 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
|
3340 png_colorp palette, int num_palette)); |
|
3341 # endif |
|
3342 #endif |
|
3343 |
|
3344 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
|
3345 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); |
|
3346 #endif |
|
3347 |
|
3348 #if defined(PNG_WRITE_PACK_SUPPORTED) |
|
3349 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
|
3350 png_bytep row, png_uint_32 bit_depth)); |
|
3351 #endif |
|
3352 |
|
3353 #if defined(PNG_WRITE_SHIFT_SUPPORTED) |
|
3354 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, |
|
3355 png_color_8p bit_depth)); |
|
3356 #endif |
|
3357 |
|
3358 #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
|
3359 #if defined(PNG_READ_GAMMA_SUPPORTED) |
|
3360 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
|
3361 png_color_16p trans_values, png_color_16p background, |
|
3362 png_color_16p background_1, |
|
3363 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, |
|
3364 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, |
|
3365 png_uint_16pp gamma_16_to_1, int gamma_shift)); |
|
3366 #else |
|
3367 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
|
3368 png_color_16p trans_values, png_color_16p background)); |
|
3369 #endif |
|
3370 #endif |
|
3371 |
|
3372 #if defined(PNG_READ_GAMMA_SUPPORTED) |
|
3373 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, |
|
3374 png_bytep gamma_table, png_uint_16pp gamma_16_table, |
|
3375 int gamma_shift)); |
|
3376 #endif |
|
3377 |
|
3378 #if defined(PNG_READ_EXPAND_SUPPORTED) |
|
3379 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
|
3380 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); |
|
3381 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
|
3382 png_bytep row, png_color_16p trans_value)); |
|
3383 #endif |
|
3384 |
|
3385 /* The following decodes the appropriate chunks, and does error correction, |
|
3386 * then calls the appropriate callback for the chunk if it is valid. |
|
3387 */ |
|
3388 |
|
3389 /* decode the IHDR chunk */ |
|
3390 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3391 png_uint_32 length)); |
|
3392 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3393 png_uint_32 length)); |
|
3394 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3395 png_uint_32 length)); |
|
3396 |
|
3397 #if defined(PNG_READ_bKGD_SUPPORTED) |
|
3398 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3399 png_uint_32 length)); |
|
3400 #endif |
|
3401 |
|
3402 #if defined(PNG_READ_cHRM_SUPPORTED) |
|
3403 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3404 png_uint_32 length)); |
|
3405 #endif |
|
3406 |
|
3407 #if defined(PNG_READ_gAMA_SUPPORTED) |
|
3408 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3409 png_uint_32 length)); |
|
3410 #endif |
|
3411 |
|
3412 #if defined(PNG_READ_hIST_SUPPORTED) |
|
3413 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3414 png_uint_32 length)); |
|
3415 #endif |
|
3416 |
|
3417 #if defined(PNG_READ_iCCP_SUPPORTED) |
|
3418 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3419 png_uint_32 length)); |
|
3420 #endif /* PNG_READ_iCCP_SUPPORTED */ |
|
3421 |
|
3422 #if defined(PNG_READ_iTXt_SUPPORTED) |
|
3423 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3424 png_uint_32 length)); |
|
3425 #endif |
|
3426 |
|
3427 #if defined(PNG_READ_oFFs_SUPPORTED) |
|
3428 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3429 png_uint_32 length)); |
|
3430 #endif |
|
3431 |
|
3432 #if defined(PNG_READ_pCAL_SUPPORTED) |
|
3433 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3434 png_uint_32 length)); |
|
3435 #endif |
|
3436 |
|
3437 #if defined(PNG_READ_pHYs_SUPPORTED) |
|
3438 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3439 png_uint_32 length)); |
|
3440 #endif |
|
3441 |
|
3442 #if defined(PNG_READ_sBIT_SUPPORTED) |
|
3443 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3444 png_uint_32 length)); |
|
3445 #endif |
|
3446 |
|
3447 #if defined(PNG_READ_sCAL_SUPPORTED) |
|
3448 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3449 png_uint_32 length)); |
|
3450 #endif |
|
3451 |
|
3452 #if defined(PNG_READ_sPLT_SUPPORTED) |
|
3453 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3454 png_uint_32 length)); |
|
3455 #endif /* PNG_READ_sPLT_SUPPORTED */ |
|
3456 |
|
3457 #if defined(PNG_READ_sRGB_SUPPORTED) |
|
3458 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3459 png_uint_32 length)); |
|
3460 #endif |
|
3461 |
|
3462 #if defined(PNG_READ_tEXt_SUPPORTED) |
|
3463 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3464 png_uint_32 length)); |
|
3465 #endif |
|
3466 |
|
3467 #if defined(PNG_READ_tIME_SUPPORTED) |
|
3468 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3469 png_uint_32 length)); |
|
3470 #endif |
|
3471 |
|
3472 #if defined(PNG_READ_tRNS_SUPPORTED) |
|
3473 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3474 png_uint_32 length)); |
|
3475 #endif |
|
3476 |
|
3477 #if defined(PNG_READ_zTXt_SUPPORTED) |
|
3478 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
3479 png_uint_32 length)); |
|
3480 #endif |
|
3481 |
|
3482 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
|
3483 png_infop info_ptr, png_uint_32 length)); |
|
3484 |
|
3485 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
|
3486 png_bytep chunk_name)); |
|
3487 |
|
3488 /* handle the transformations for reading and writing */ |
|
3489 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
|
3490 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
|
3491 |
|
3492 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
|
3493 |
|
3494 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
3495 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
|
3496 png_infop info_ptr)); |
|
3497 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
|
3498 png_infop info_ptr)); |
|
3499 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
|
3500 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
|
3501 png_uint_32 length)); |
|
3502 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
|
3503 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
|
3504 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
|
3505 png_bytep buffer, png_size_t buffer_length)); |
|
3506 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
|
3507 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
|
3508 png_bytep buffer, png_size_t buffer_length)); |
|
3509 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
|
3510 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
|
3511 png_infop info_ptr, png_uint_32 length)); |
|
3512 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
|
3513 png_infop info_ptr)); |
|
3514 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
|
3515 png_infop info_ptr)); |
|
3516 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
|
3517 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
|
3518 png_infop info_ptr)); |
|
3519 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
|
3520 png_infop info_ptr)); |
|
3521 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
|
3522 #if defined(PNG_READ_tEXt_SUPPORTED) |
|
3523 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
|
3524 png_infop info_ptr, png_uint_32 length)); |
|
3525 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
|
3526 png_infop info_ptr)); |
|
3527 #endif |
|
3528 #if defined(PNG_READ_zTXt_SUPPORTED) |
|
3529 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
|
3530 png_infop info_ptr, png_uint_32 length)); |
|
3531 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
|
3532 png_infop info_ptr)); |
|
3533 #endif |
|
3534 #if defined(PNG_READ_iTXt_SUPPORTED) |
|
3535 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
|
3536 png_infop info_ptr, png_uint_32 length)); |
|
3537 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
|
3538 png_infop info_ptr)); |
|
3539 #endif |
|
3540 |
|
3541 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
3542 |
|
3543 #ifdef PNG_MNG_FEATURES_SUPPORTED |
|
3544 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
|
3545 png_bytep row)); |
|
3546 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
|
3547 png_bytep row)); |
|
3548 #endif |
|
3549 |
|
3550 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
|
3551 #if defined(PNG_MMX_CODE_SUPPORTED) |
|
3552 /* png.c */ /* PRIVATE */ |
|
3553 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); |
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3554 #endif |
|
3555 #endif |
|
3556 |
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3557 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) |
|
3558 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, |
|
3559 png_infop info_ptr)); |
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3560 |
|
3561 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, |
|
3562 png_infop info_ptr)); |
|
3563 |
|
3564 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, |
|
3565 png_infop info_ptr)); |
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3566 |
|
3567 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, |
|
3568 png_infop info_ptr)); |
|
3569 |
|
3570 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, |
|
3571 png_infop info_ptr)); |
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3572 |
|
3573 #if defined(PNG_pHYs_SUPPORTED) |
|
3574 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, |
|
3575 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
|
3576 #endif /* PNG_pHYs_SUPPORTED */ |
|
3577 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ |
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3578 |
|
3579 /* Read the chunk header (length + type name) */ |
|
3580 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); |
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3581 |
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3582 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
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3583 |
|
3584 #endif /* PNG_INTERNAL */ |
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3585 |
|
3586 #ifdef __cplusplus |
|
3587 } |
|
3588 #endif |
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3589 |
|
3590 #endif /* PNG_VERSION_INFO_ONLY */ |
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3591 /* do not put anything past this line */ |
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3592 #endif /* PNG_H */ |