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1 |
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2 /* pngget.c - retrieval of values from info struct |
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3 * |
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4 * Last changed in libpng 1.2.37 [June 4, 2009] |
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5 * Copyright (c) 1998-2009 Glenn Randers-Pehrson |
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6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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8 * |
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9 * This code is released under the libpng license. |
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10 * For conditions of distribution and use, see the disclaimer |
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11 * and license in png.h |
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12 * |
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13 */ |
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14 |
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15 #define PNG_INTERNAL |
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16 #include "png.h" |
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17 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
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18 |
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19 png_uint_32 PNGAPI |
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20 png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag) |
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21 { |
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22 if (png_ptr != NULL && info_ptr != NULL) |
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23 return(info_ptr->valid & flag); |
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24 |
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25 else |
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26 return(0); |
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27 } |
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28 |
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29 png_uint_32 PNGAPI |
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30 png_get_rowbytes(png_structp png_ptr, png_infop info_ptr) |
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31 { |
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32 if (png_ptr != NULL && info_ptr != NULL) |
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33 return(info_ptr->rowbytes); |
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34 |
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35 else |
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36 return(0); |
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37 } |
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38 |
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39 #if defined(PNG_INFO_IMAGE_SUPPORTED) |
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40 png_bytepp PNGAPI |
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41 png_get_rows(png_structp png_ptr, png_infop info_ptr) |
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42 { |
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43 if (png_ptr != NULL && info_ptr != NULL) |
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44 return(info_ptr->row_pointers); |
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45 |
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46 else |
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47 return(0); |
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48 } |
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49 #endif |
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50 |
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51 #ifdef PNG_EASY_ACCESS_SUPPORTED |
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52 /* Easy access to info, added in libpng-0.99 */ |
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53 png_uint_32 PNGAPI |
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54 png_get_image_width(png_structp png_ptr, png_infop info_ptr) |
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55 { |
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56 if (png_ptr != NULL && info_ptr != NULL) |
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57 return info_ptr->width; |
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58 |
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59 return (0); |
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60 } |
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61 |
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62 png_uint_32 PNGAPI |
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63 png_get_image_height(png_structp png_ptr, png_infop info_ptr) |
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64 { |
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65 if (png_ptr != NULL && info_ptr != NULL) |
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66 return info_ptr->height; |
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67 |
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68 return (0); |
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69 } |
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70 |
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71 png_byte PNGAPI |
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72 png_get_bit_depth(png_structp png_ptr, png_infop info_ptr) |
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73 { |
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74 if (png_ptr != NULL && info_ptr != NULL) |
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75 return info_ptr->bit_depth; |
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76 |
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77 return (0); |
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78 } |
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79 |
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80 png_byte PNGAPI |
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81 png_get_color_type(png_structp png_ptr, png_infop info_ptr) |
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82 { |
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83 if (png_ptr != NULL && info_ptr != NULL) |
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84 return info_ptr->color_type; |
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85 |
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86 return (0); |
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87 } |
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88 |
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89 png_byte PNGAPI |
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90 png_get_filter_type(png_structp png_ptr, png_infop info_ptr) |
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91 { |
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92 if (png_ptr != NULL && info_ptr != NULL) |
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93 return info_ptr->filter_type; |
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94 |
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95 return (0); |
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96 } |
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97 |
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98 png_byte PNGAPI |
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99 png_get_interlace_type(png_structp png_ptr, png_infop info_ptr) |
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100 { |
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101 if (png_ptr != NULL && info_ptr != NULL) |
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102 return info_ptr->interlace_type; |
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103 |
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104 return (0); |
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105 } |
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106 |
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107 png_byte PNGAPI |
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108 png_get_compression_type(png_structp png_ptr, png_infop info_ptr) |
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109 { |
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110 if (png_ptr != NULL && info_ptr != NULL) |
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111 return info_ptr->compression_type; |
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112 |
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113 return (0); |
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114 } |
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115 |
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116 png_uint_32 PNGAPI |
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117 png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
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118 { |
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119 if (png_ptr != NULL && info_ptr != NULL) |
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120 #if defined(PNG_pHYs_SUPPORTED) |
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121 if (info_ptr->valid & PNG_INFO_pHYs) |
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122 { |
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123 png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter"); |
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124 |
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125 if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER) |
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126 return (0); |
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127 |
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128 else |
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129 return (info_ptr->x_pixels_per_unit); |
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130 } |
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131 #else |
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132 return (0); |
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133 #endif |
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134 return (0); |
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135 } |
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136 |
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137 png_uint_32 PNGAPI |
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138 png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
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139 { |
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140 if (png_ptr != NULL && info_ptr != NULL) |
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141 #if defined(PNG_pHYs_SUPPORTED) |
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142 if (info_ptr->valid & PNG_INFO_pHYs) |
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143 { |
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144 png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter"); |
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145 |
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146 if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER) |
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147 return (0); |
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148 |
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149 else |
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150 return (info_ptr->y_pixels_per_unit); |
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151 } |
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152 #else |
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153 return (0); |
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154 #endif |
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155 return (0); |
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156 } |
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157 |
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158 png_uint_32 PNGAPI |
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159 png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
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160 { |
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161 if (png_ptr != NULL && info_ptr != NULL) |
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162 #if defined(PNG_pHYs_SUPPORTED) |
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163 if (info_ptr->valid & PNG_INFO_pHYs) |
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164 { |
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165 png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter"); |
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166 |
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167 if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER || |
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168 info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit) |
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169 return (0); |
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170 |
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171 else |
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172 return (info_ptr->x_pixels_per_unit); |
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173 } |
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174 #else |
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175 return (0); |
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176 #endif |
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177 return (0); |
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178 } |
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179 |
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180 #ifdef PNG_FLOATING_POINT_SUPPORTED |
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181 float PNGAPI |
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182 png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr) |
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183 { |
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184 if (png_ptr != NULL && info_ptr != NULL) |
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185 #if defined(PNG_pHYs_SUPPORTED) |
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186 |
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187 if (info_ptr->valid & PNG_INFO_pHYs) |
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188 { |
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189 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio"); |
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190 if (info_ptr->x_pixels_per_unit == 0) |
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191 return ((float)0.0); |
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192 else |
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193 return ((float)((float)info_ptr->y_pixels_per_unit |
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194 /(float)info_ptr->x_pixels_per_unit)); |
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195 } |
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196 #else |
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197 return (0.0); |
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198 #endif |
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199 return ((float)0.0); |
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200 } |
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201 #endif |
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202 |
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203 png_int_32 PNGAPI |
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204 png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr) |
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205 { |
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206 if (png_ptr != NULL && info_ptr != NULL) |
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207 #if defined(PNG_oFFs_SUPPORTED) |
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208 |
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209 if (info_ptr->valid & PNG_INFO_oFFs) |
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210 { |
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211 png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); |
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212 |
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213 if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) |
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214 return (0); |
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215 |
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216 else |
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217 return (info_ptr->x_offset); |
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218 } |
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219 #else |
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220 return (0); |
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221 #endif |
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222 return (0); |
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223 } |
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224 |
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225 png_int_32 PNGAPI |
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226 png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr) |
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227 { |
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228 if (png_ptr != NULL && info_ptr != NULL) |
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229 |
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230 #if defined(PNG_oFFs_SUPPORTED) |
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231 if (info_ptr->valid & PNG_INFO_oFFs) |
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232 { |
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233 png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); |
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234 |
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235 if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) |
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236 return (0); |
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237 |
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238 else |
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239 return (info_ptr->y_offset); |
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240 } |
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241 #else |
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242 return (0); |
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243 #endif |
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244 return (0); |
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245 } |
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246 |
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247 png_int_32 PNGAPI |
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248 png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr) |
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249 { |
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250 if (png_ptr != NULL && info_ptr != NULL) |
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251 |
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252 #if defined(PNG_oFFs_SUPPORTED) |
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253 if (info_ptr->valid & PNG_INFO_oFFs) |
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254 { |
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255 png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); |
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256 |
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257 if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) |
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258 return (0); |
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259 |
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260 else |
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261 return (info_ptr->x_offset); |
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262 } |
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263 #else |
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264 return (0); |
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265 #endif |
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266 return (0); |
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267 } |
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268 |
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269 png_int_32 PNGAPI |
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270 png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr) |
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271 { |
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272 if (png_ptr != NULL && info_ptr != NULL) |
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273 |
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274 #if defined(PNG_oFFs_SUPPORTED) |
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275 if (info_ptr->valid & PNG_INFO_oFFs) |
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276 { |
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277 png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); |
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278 |
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279 if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) |
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280 return (0); |
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281 |
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282 else |
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283 return (info_ptr->y_offset); |
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284 } |
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285 #else |
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286 return (0); |
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287 #endif |
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288 return (0); |
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289 } |
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290 |
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291 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) |
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292 png_uint_32 PNGAPI |
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293 png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
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294 { |
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295 return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr) |
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296 *.0254 +.5)); |
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297 } |
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298 |
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299 png_uint_32 PNGAPI |
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300 png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
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301 { |
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302 return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr) |
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303 *.0254 +.5)); |
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304 } |
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305 |
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306 png_uint_32 PNGAPI |
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307 png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
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308 { |
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309 return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr) |
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310 *.0254 +.5)); |
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311 } |
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312 |
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313 float PNGAPI |
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314 png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr) |
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315 { |
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316 return ((float)png_get_x_offset_microns(png_ptr, info_ptr) |
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317 *.00003937); |
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318 } |
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319 |
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320 float PNGAPI |
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321 png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr) |
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322 { |
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323 return ((float)png_get_y_offset_microns(png_ptr, info_ptr) |
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324 *.00003937); |
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325 } |
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326 |
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327 #if defined(PNG_pHYs_SUPPORTED) |
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328 png_uint_32 PNGAPI |
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329 png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr, |
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330 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) |
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331 { |
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332 png_uint_32 retval = 0; |
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333 |
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334 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
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335 { |
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336 png_debug1(1, "in %s retrieval function", "pHYs"); |
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337 if (res_x != NULL) |
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338 { |
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339 *res_x = info_ptr->x_pixels_per_unit; |
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340 retval |= PNG_INFO_pHYs; |
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341 } |
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342 if (res_y != NULL) |
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343 { |
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344 *res_y = info_ptr->y_pixels_per_unit; |
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345 retval |= PNG_INFO_pHYs; |
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346 } |
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347 if (unit_type != NULL) |
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348 { |
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349 *unit_type = (int)info_ptr->phys_unit_type; |
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350 retval |= PNG_INFO_pHYs; |
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351 if (*unit_type == 1) |
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352 { |
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353 if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50); |
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354 if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50); |
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355 } |
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356 } |
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357 } |
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358 return (retval); |
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359 } |
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360 #endif /* PNG_pHYs_SUPPORTED */ |
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361 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ |
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362 |
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363 /* png_get_channels really belongs in here, too, but it's been around longer */ |
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364 |
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365 #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
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366 |
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367 png_byte PNGAPI |
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368 png_get_channels(png_structp png_ptr, png_infop info_ptr) |
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369 { |
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370 if (png_ptr != NULL && info_ptr != NULL) |
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371 return(info_ptr->channels); |
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372 else |
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373 return (0); |
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374 } |
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375 |
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376 png_bytep PNGAPI |
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377 png_get_signature(png_structp png_ptr, png_infop info_ptr) |
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378 { |
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379 if (png_ptr != NULL && info_ptr != NULL) |
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380 return(info_ptr->signature); |
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381 else |
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382 return (NULL); |
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383 } |
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384 |
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385 #if defined(PNG_bKGD_SUPPORTED) |
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386 png_uint_32 PNGAPI |
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387 png_get_bKGD(png_structp png_ptr, png_infop info_ptr, |
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388 png_color_16p *background) |
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389 { |
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390 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) |
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391 && background != NULL) |
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392 { |
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393 png_debug1(1, "in %s retrieval function", "bKGD"); |
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394 *background = &(info_ptr->background); |
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395 return (PNG_INFO_bKGD); |
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396 } |
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397 return (0); |
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398 } |
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399 #endif |
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400 |
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401 #if defined(PNG_cHRM_SUPPORTED) |
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402 #ifdef PNG_FLOATING_POINT_SUPPORTED |
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403 png_uint_32 PNGAPI |
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404 png_get_cHRM(png_structp png_ptr, png_infop info_ptr, |
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405 double *white_x, double *white_y, double *red_x, double *red_y, |
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406 double *green_x, double *green_y, double *blue_x, double *blue_y) |
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407 { |
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408 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) |
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409 { |
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410 png_debug1(1, "in %s retrieval function", "cHRM"); |
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411 if (white_x != NULL) |
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412 *white_x = (double)info_ptr->x_white; |
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413 if (white_y != NULL) |
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414 *white_y = (double)info_ptr->y_white; |
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415 if (red_x != NULL) |
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416 *red_x = (double)info_ptr->x_red; |
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417 if (red_y != NULL) |
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418 *red_y = (double)info_ptr->y_red; |
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419 if (green_x != NULL) |
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420 *green_x = (double)info_ptr->x_green; |
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421 if (green_y != NULL) |
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422 *green_y = (double)info_ptr->y_green; |
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423 if (blue_x != NULL) |
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424 *blue_x = (double)info_ptr->x_blue; |
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425 if (blue_y != NULL) |
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426 *blue_y = (double)info_ptr->y_blue; |
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427 return (PNG_INFO_cHRM); |
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428 } |
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429 return (0); |
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430 } |
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431 #endif |
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432 #ifdef PNG_FIXED_POINT_SUPPORTED |
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433 png_uint_32 PNGAPI |
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434 png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr, |
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435 png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, |
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436 png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, |
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437 png_fixed_point *blue_x, png_fixed_point *blue_y) |
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438 { |
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439 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) |
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440 { |
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441 png_debug1(1, "in %s retrieval function", "cHRM"); |
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442 if (white_x != NULL) |
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443 *white_x = info_ptr->int_x_white; |
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444 if (white_y != NULL) |
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445 *white_y = info_ptr->int_y_white; |
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446 if (red_x != NULL) |
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447 *red_x = info_ptr->int_x_red; |
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448 if (red_y != NULL) |
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449 *red_y = info_ptr->int_y_red; |
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450 if (green_x != NULL) |
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451 *green_x = info_ptr->int_x_green; |
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452 if (green_y != NULL) |
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453 *green_y = info_ptr->int_y_green; |
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454 if (blue_x != NULL) |
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455 *blue_x = info_ptr->int_x_blue; |
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456 if (blue_y != NULL) |
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457 *blue_y = info_ptr->int_y_blue; |
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458 return (PNG_INFO_cHRM); |
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459 } |
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460 return (0); |
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461 } |
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462 #endif |
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463 #endif |
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464 |
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465 #if defined(PNG_gAMA_SUPPORTED) |
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466 #ifdef PNG_FLOATING_POINT_SUPPORTED |
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467 png_uint_32 PNGAPI |
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468 png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma) |
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469 { |
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470 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
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471 && file_gamma != NULL) |
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472 { |
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473 png_debug1(1, "in %s retrieval function", "gAMA"); |
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474 *file_gamma = (double)info_ptr->gamma; |
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475 return (PNG_INFO_gAMA); |
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476 } |
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477 return (0); |
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478 } |
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479 #endif |
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480 #ifdef PNG_FIXED_POINT_SUPPORTED |
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481 png_uint_32 PNGAPI |
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482 png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, |
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483 png_fixed_point *int_file_gamma) |
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484 { |
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485 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
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486 && int_file_gamma != NULL) |
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487 { |
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488 png_debug1(1, "in %s retrieval function", "gAMA"); |
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489 *int_file_gamma = info_ptr->int_gamma; |
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490 return (PNG_INFO_gAMA); |
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491 } |
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492 return (0); |
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493 } |
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494 #endif |
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495 #endif |
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496 |
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497 #if defined(PNG_sRGB_SUPPORTED) |
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498 png_uint_32 PNGAPI |
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499 png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent) |
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500 { |
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501 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB) |
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502 && file_srgb_intent != NULL) |
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503 { |
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504 png_debug1(1, "in %s retrieval function", "sRGB"); |
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505 *file_srgb_intent = (int)info_ptr->srgb_intent; |
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506 return (PNG_INFO_sRGB); |
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507 } |
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508 return (0); |
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509 } |
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510 #endif |
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511 |
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512 #if defined(PNG_iCCP_SUPPORTED) |
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513 png_uint_32 PNGAPI |
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514 png_get_iCCP(png_structp png_ptr, png_infop info_ptr, |
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515 png_charpp name, int *compression_type, |
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516 png_charpp profile, png_uint_32 *proflen) |
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517 { |
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518 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP) |
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519 && name != NULL && profile != NULL && proflen != NULL) |
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520 { |
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521 png_debug1(1, "in %s retrieval function", "iCCP"); |
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522 *name = info_ptr->iccp_name; |
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523 *profile = info_ptr->iccp_profile; |
|
524 /* Compression_type is a dummy so the API won't have to change |
|
525 * if we introduce multiple compression types later. |
|
526 */ |
|
527 *proflen = (int)info_ptr->iccp_proflen; |
|
528 *compression_type = (int)info_ptr->iccp_compression; |
|
529 return (PNG_INFO_iCCP); |
|
530 } |
|
531 return (0); |
|
532 } |
|
533 #endif |
|
534 |
|
535 #if defined(PNG_sPLT_SUPPORTED) |
|
536 png_uint_32 PNGAPI |
|
537 png_get_sPLT(png_structp png_ptr, png_infop info_ptr, |
|
538 png_sPLT_tpp spalettes) |
|
539 { |
|
540 if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL) |
|
541 { |
|
542 *spalettes = info_ptr->splt_palettes; |
|
543 return ((png_uint_32)info_ptr->splt_palettes_num); |
|
544 } |
|
545 return (0); |
|
546 } |
|
547 #endif |
|
548 |
|
549 #if defined(PNG_hIST_SUPPORTED) |
|
550 png_uint_32 PNGAPI |
|
551 png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist) |
|
552 { |
|
553 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) |
|
554 && hist != NULL) |
|
555 { |
|
556 png_debug1(1, "in %s retrieval function", "hIST"); |
|
557 *hist = info_ptr->hist; |
|
558 return (PNG_INFO_hIST); |
|
559 } |
|
560 return (0); |
|
561 } |
|
562 #endif |
|
563 |
|
564 png_uint_32 PNGAPI |
|
565 png_get_IHDR(png_structp png_ptr, png_infop info_ptr, |
|
566 png_uint_32 *width, png_uint_32 *height, int *bit_depth, |
|
567 int *color_type, int *interlace_type, int *compression_type, |
|
568 int *filter_type) |
|
569 |
|
570 { |
|
571 if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL && |
|
572 bit_depth != NULL && color_type != NULL) |
|
573 { |
|
574 png_debug1(1, "in %s retrieval function", "IHDR"); |
|
575 *width = info_ptr->width; |
|
576 *height = info_ptr->height; |
|
577 *bit_depth = info_ptr->bit_depth; |
|
578 if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16) |
|
579 png_error(png_ptr, "Invalid bit depth"); |
|
580 |
|
581 *color_type = info_ptr->color_type; |
|
582 |
|
583 if (info_ptr->color_type > 6) |
|
584 png_error(png_ptr, "Invalid color type"); |
|
585 |
|
586 if (compression_type != NULL) |
|
587 *compression_type = info_ptr->compression_type; |
|
588 |
|
589 if (filter_type != NULL) |
|
590 *filter_type = info_ptr->filter_type; |
|
591 |
|
592 if (interlace_type != NULL) |
|
593 *interlace_type = info_ptr->interlace_type; |
|
594 |
|
595 /* Check for potential overflow of rowbytes */ |
|
596 if (*width == 0 || *width > PNG_UINT_31_MAX) |
|
597 png_error(png_ptr, "Invalid image width"); |
|
598 |
|
599 if (*height == 0 || *height > PNG_UINT_31_MAX) |
|
600 png_error(png_ptr, "Invalid image height"); |
|
601 |
|
602 if (info_ptr->width > (PNG_UINT_32_MAX |
|
603 >> 3) /* 8-byte RGBA pixels */ |
|
604 - 64 /* bigrowbuf hack */ |
|
605 - 1 /* filter byte */ |
|
606 - 7*8 /* rounding of width to multiple of 8 pixels */ |
|
607 - 8) /* extra max_pixel_depth pad */ |
|
608 { |
|
609 png_warning(png_ptr, |
|
610 "Width too large for libpng to process image data."); |
|
611 } |
|
612 |
|
613 return (1); |
|
614 } |
|
615 return (0); |
|
616 } |
|
617 |
|
618 #if defined(PNG_oFFs_SUPPORTED) |
|
619 png_uint_32 PNGAPI |
|
620 png_get_oFFs(png_structp png_ptr, png_infop info_ptr, |
|
621 png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type) |
|
622 { |
|
623 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs) |
|
624 && offset_x != NULL && offset_y != NULL && unit_type != NULL) |
|
625 { |
|
626 png_debug1(1, "in %s retrieval function", "oFFs"); |
|
627 *offset_x = info_ptr->x_offset; |
|
628 *offset_y = info_ptr->y_offset; |
|
629 *unit_type = (int)info_ptr->offset_unit_type; |
|
630 return (PNG_INFO_oFFs); |
|
631 } |
|
632 return (0); |
|
633 } |
|
634 #endif |
|
635 |
|
636 #if defined(PNG_pCAL_SUPPORTED) |
|
637 png_uint_32 PNGAPI |
|
638 png_get_pCAL(png_structp png_ptr, png_infop info_ptr, |
|
639 png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, |
|
640 png_charp *units, png_charpp *params) |
|
641 { |
|
642 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL) |
|
643 && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL && |
|
644 nparams != NULL && units != NULL && params != NULL) |
|
645 { |
|
646 png_debug1(1, "in %s retrieval function", "pCAL"); |
|
647 *purpose = info_ptr->pcal_purpose; |
|
648 *X0 = info_ptr->pcal_X0; |
|
649 *X1 = info_ptr->pcal_X1; |
|
650 *type = (int)info_ptr->pcal_type; |
|
651 *nparams = (int)info_ptr->pcal_nparams; |
|
652 *units = info_ptr->pcal_units; |
|
653 *params = info_ptr->pcal_params; |
|
654 return (PNG_INFO_pCAL); |
|
655 } |
|
656 return (0); |
|
657 } |
|
658 #endif |
|
659 |
|
660 #if defined(PNG_sCAL_SUPPORTED) |
|
661 #ifdef PNG_FLOATING_POINT_SUPPORTED |
|
662 png_uint_32 PNGAPI |
|
663 png_get_sCAL(png_structp png_ptr, png_infop info_ptr, |
|
664 int *unit, double *width, double *height) |
|
665 { |
|
666 if (png_ptr != NULL && info_ptr != NULL && |
|
667 (info_ptr->valid & PNG_INFO_sCAL)) |
|
668 { |
|
669 *unit = info_ptr->scal_unit; |
|
670 *width = info_ptr->scal_pixel_width; |
|
671 *height = info_ptr->scal_pixel_height; |
|
672 return (PNG_INFO_sCAL); |
|
673 } |
|
674 return(0); |
|
675 } |
|
676 #else |
|
677 #ifdef PNG_FIXED_POINT_SUPPORTED |
|
678 png_uint_32 PNGAPI |
|
679 png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr, |
|
680 int *unit, png_charpp width, png_charpp height) |
|
681 { |
|
682 if (png_ptr != NULL && info_ptr != NULL && |
|
683 (info_ptr->valid & PNG_INFO_sCAL)) |
|
684 { |
|
685 *unit = info_ptr->scal_unit; |
|
686 *width = info_ptr->scal_s_width; |
|
687 *height = info_ptr->scal_s_height; |
|
688 return (PNG_INFO_sCAL); |
|
689 } |
|
690 return(0); |
|
691 } |
|
692 #endif |
|
693 #endif |
|
694 #endif |
|
695 |
|
696 #if defined(PNG_pHYs_SUPPORTED) |
|
697 png_uint_32 PNGAPI |
|
698 png_get_pHYs(png_structp png_ptr, png_infop info_ptr, |
|
699 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) |
|
700 { |
|
701 png_uint_32 retval = 0; |
|
702 |
|
703 if (png_ptr != NULL && info_ptr != NULL && |
|
704 (info_ptr->valid & PNG_INFO_pHYs)) |
|
705 { |
|
706 png_debug1(1, "in %s retrieval function", "pHYs"); |
|
707 |
|
708 if (res_x != NULL) |
|
709 { |
|
710 *res_x = info_ptr->x_pixels_per_unit; |
|
711 retval |= PNG_INFO_pHYs; |
|
712 } |
|
713 |
|
714 if (res_y != NULL) |
|
715 { |
|
716 *res_y = info_ptr->y_pixels_per_unit; |
|
717 retval |= PNG_INFO_pHYs; |
|
718 } |
|
719 |
|
720 if (unit_type != NULL) |
|
721 { |
|
722 *unit_type = (int)info_ptr->phys_unit_type; |
|
723 retval |= PNG_INFO_pHYs; |
|
724 } |
|
725 } |
|
726 return (retval); |
|
727 } |
|
728 #endif |
|
729 |
|
730 png_uint_32 PNGAPI |
|
731 png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette, |
|
732 int *num_palette) |
|
733 { |
|
734 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE) |
|
735 && palette != NULL) |
|
736 { |
|
737 png_debug1(1, "in %s retrieval function", "PLTE"); |
|
738 *palette = info_ptr->palette; |
|
739 *num_palette = info_ptr->num_palette; |
|
740 png_debug1(3, "num_palette = %d", *num_palette); |
|
741 return (PNG_INFO_PLTE); |
|
742 } |
|
743 return (0); |
|
744 } |
|
745 |
|
746 #if defined(PNG_sBIT_SUPPORTED) |
|
747 png_uint_32 PNGAPI |
|
748 png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit) |
|
749 { |
|
750 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT) |
|
751 && sig_bit != NULL) |
|
752 { |
|
753 png_debug1(1, "in %s retrieval function", "sBIT"); |
|
754 *sig_bit = &(info_ptr->sig_bit); |
|
755 return (PNG_INFO_sBIT); |
|
756 } |
|
757 return (0); |
|
758 } |
|
759 #endif |
|
760 |
|
761 #if defined(PNG_TEXT_SUPPORTED) |
|
762 png_uint_32 PNGAPI |
|
763 png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr, |
|
764 int *num_text) |
|
765 { |
|
766 if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) |
|
767 { |
|
768 png_debug1(1, "in %s retrieval function", |
|
769 (png_ptr->chunk_name[0] == '\0' ? "text" |
|
770 : (png_const_charp)png_ptr->chunk_name)); |
|
771 |
|
772 if (text_ptr != NULL) |
|
773 *text_ptr = info_ptr->text; |
|
774 |
|
775 if (num_text != NULL) |
|
776 *num_text = info_ptr->num_text; |
|
777 |
|
778 return ((png_uint_32)info_ptr->num_text); |
|
779 } |
|
780 if (num_text != NULL) |
|
781 *num_text = 0; |
|
782 return(0); |
|
783 } |
|
784 #endif |
|
785 |
|
786 #if defined(PNG_tIME_SUPPORTED) |
|
787 png_uint_32 PNGAPI |
|
788 png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time) |
|
789 { |
|
790 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME) |
|
791 && mod_time != NULL) |
|
792 { |
|
793 png_debug1(1, "in %s retrieval function", "tIME"); |
|
794 *mod_time = &(info_ptr->mod_time); |
|
795 return (PNG_INFO_tIME); |
|
796 } |
|
797 return (0); |
|
798 } |
|
799 #endif |
|
800 |
|
801 #if defined(PNG_tRNS_SUPPORTED) |
|
802 png_uint_32 PNGAPI |
|
803 png_get_tRNS(png_structp png_ptr, png_infop info_ptr, |
|
804 png_bytep *trans, int *num_trans, png_color_16p *trans_values) |
|
805 { |
|
806 png_uint_32 retval = 0; |
|
807 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) |
|
808 { |
|
809 png_debug1(1, "in %s retrieval function", "tRNS"); |
|
810 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
|
811 { |
|
812 if (trans != NULL) |
|
813 { |
|
814 *trans = info_ptr->trans; |
|
815 retval |= PNG_INFO_tRNS; |
|
816 } |
|
817 |
|
818 if (trans_values != NULL) |
|
819 *trans_values = &(info_ptr->trans_values); |
|
820 } |
|
821 else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */ |
|
822 { |
|
823 if (trans_values != NULL) |
|
824 { |
|
825 *trans_values = &(info_ptr->trans_values); |
|
826 retval |= PNG_INFO_tRNS; |
|
827 } |
|
828 |
|
829 if (trans != NULL) |
|
830 *trans = NULL; |
|
831 } |
|
832 if (num_trans != NULL) |
|
833 { |
|
834 *num_trans = info_ptr->num_trans; |
|
835 retval |= PNG_INFO_tRNS; |
|
836 } |
|
837 } |
|
838 return (retval); |
|
839 } |
|
840 #endif |
|
841 |
|
842 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
|
843 png_uint_32 PNGAPI |
|
844 png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr, |
|
845 png_unknown_chunkpp unknowns) |
|
846 { |
|
847 if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL) |
|
848 { |
|
849 *unknowns = info_ptr->unknown_chunks; |
|
850 return ((png_uint_32)info_ptr->unknown_chunks_num); |
|
851 } |
|
852 return (0); |
|
853 } |
|
854 #endif |
|
855 |
|
856 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
|
857 png_byte PNGAPI |
|
858 png_get_rgb_to_gray_status (png_structp png_ptr) |
|
859 { |
|
860 return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0); |
|
861 } |
|
862 #endif |
|
863 |
|
864 #if defined(PNG_USER_CHUNKS_SUPPORTED) |
|
865 png_voidp PNGAPI |
|
866 png_get_user_chunk_ptr(png_structp png_ptr) |
|
867 { |
|
868 return (png_ptr? png_ptr->user_chunk_ptr : NULL); |
|
869 } |
|
870 #endif |
|
871 |
|
872 #ifdef PNG_WRITE_SUPPORTED |
|
873 png_uint_32 PNGAPI |
|
874 png_get_compression_buffer_size(png_structp png_ptr) |
|
875 { |
|
876 return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L); |
|
877 } |
|
878 #endif |
|
879 |
|
880 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED |
|
881 #ifndef PNG_1_0_X |
|
882 /* This function was added to libpng 1.2.0 and should exist by default */ |
|
883 png_uint_32 PNGAPI |
|
884 png_get_asm_flags (png_structp png_ptr) |
|
885 { |
|
886 /* Obsolete, to be removed from libpng-1.4.0 */ |
|
887 return (png_ptr? 0L: 0L); |
|
888 } |
|
889 |
|
890 /* This function was added to libpng 1.2.0 and should exist by default */ |
|
891 png_uint_32 PNGAPI |
|
892 png_get_asm_flagmask (int flag_select) |
|
893 { |
|
894 /* Obsolete, to be removed from libpng-1.4.0 */ |
|
895 flag_select=flag_select; |
|
896 return 0L; |
|
897 } |
|
898 |
|
899 /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */ |
|
900 /* This function was added to libpng 1.2.0 */ |
|
901 png_uint_32 PNGAPI |
|
902 png_get_mmx_flagmask (int flag_select, int *compilerID) |
|
903 { |
|
904 /* Obsolete, to be removed from libpng-1.4.0 */ |
|
905 flag_select=flag_select; |
|
906 *compilerID = -1; /* unknown (i.e., no asm/MMX code compiled) */ |
|
907 return 0L; |
|
908 } |
|
909 |
|
910 /* This function was added to libpng 1.2.0 */ |
|
911 png_byte PNGAPI |
|
912 png_get_mmx_bitdepth_threshold (png_structp png_ptr) |
|
913 { |
|
914 /* Obsolete, to be removed from libpng-1.4.0 */ |
|
915 return (png_ptr? 0: 0); |
|
916 } |
|
917 |
|
918 /* This function was added to libpng 1.2.0 */ |
|
919 png_uint_32 PNGAPI |
|
920 png_get_mmx_rowbytes_threshold (png_structp png_ptr) |
|
921 { |
|
922 /* Obsolete, to be removed from libpng-1.4.0 */ |
|
923 return (png_ptr? 0L: 0L); |
|
924 } |
|
925 #endif /* ?PNG_1_0_X */ |
|
926 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */ |
|
927 |
|
928 #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
|
929 /* These functions were added to libpng 1.2.6 */ |
|
930 png_uint_32 PNGAPI |
|
931 png_get_user_width_max (png_structp png_ptr) |
|
932 { |
|
933 return (png_ptr? png_ptr->user_width_max : 0); |
|
934 } |
|
935 png_uint_32 PNGAPI |
|
936 png_get_user_height_max (png_structp png_ptr) |
|
937 { |
|
938 return (png_ptr? png_ptr->user_height_max : 0); |
|
939 } |
|
940 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ |
|
941 |
|
942 |
|
943 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |