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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 #include "SDL_video.h" |
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25 #include "SDL_blit.h" |
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26 |
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27 /* Functions to blit from bitmaps to other surfaces */ |
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28 |
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29 static void BlitBto1(SDL_BlitInfo *info) |
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30 { |
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31 int c; |
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32 int width, height; |
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33 Uint8 *src, *map, *dst; |
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34 int srcskip, dstskip; |
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35 |
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36 /* Set up some basic variables */ |
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37 width = info->d_width; |
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38 height = info->d_height; |
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39 src = info->s_pixels; |
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40 srcskip = info->s_skip; |
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41 dst = info->d_pixels; |
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42 dstskip = info->d_skip; |
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43 map = info->table; |
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44 srcskip += width-(width+7)/8; |
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45 |
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46 if ( map ) { |
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47 while ( height-- ) { |
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48 Uint8 byte = 0, bit; |
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49 for ( c=0; c<width; ++c ) { |
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50 if ( (c&7) == 0 ) { |
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51 byte = *src++; |
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52 } |
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53 bit = (byte&0x80)>>7; |
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54 if ( 1 ) { |
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55 *dst = map[bit]; |
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56 } |
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57 dst++; |
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58 byte <<= 1; |
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59 } |
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60 src += srcskip; |
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61 dst += dstskip; |
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62 } |
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63 } else { |
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64 while ( height-- ) { |
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65 Uint8 byte = 0, bit; |
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66 for ( c=0; c<width; ++c ) { |
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67 if ( (c&7) == 0 ) { |
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68 byte = *src++; |
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69 } |
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70 bit = (byte&0x80)>>7; |
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71 if ( 1 ) { |
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72 *dst = bit; |
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73 } |
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74 dst++; |
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75 byte <<= 1; |
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76 } |
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77 src += srcskip; |
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78 dst += dstskip; |
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79 } |
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80 } |
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81 } |
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82 static void BlitBto2(SDL_BlitInfo *info) |
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83 { |
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84 int c; |
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85 int width, height; |
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86 Uint8 *src; |
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87 Uint16 *map, *dst; |
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88 int srcskip, dstskip; |
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89 |
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90 /* Set up some basic variables */ |
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91 width = info->d_width; |
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92 height = info->d_height; |
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93 src = info->s_pixels; |
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94 srcskip = info->s_skip; |
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95 dst = (Uint16 *)info->d_pixels; |
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96 dstskip = info->d_skip/2; |
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97 map = (Uint16 *)info->table; |
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98 srcskip += width-(width+7)/8; |
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99 |
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100 while ( height-- ) { |
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101 Uint8 byte = 0, bit; |
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102 for ( c=0; c<width; ++c ) { |
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103 if ( (c&7) == 0 ) { |
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104 byte = *src++; |
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105 } |
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106 bit = (byte&0x80)>>7; |
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107 if ( 1 ) { |
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108 *dst = map[bit]; |
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109 } |
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110 byte <<= 1; |
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111 dst++; |
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112 } |
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113 src += srcskip; |
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114 dst += dstskip; |
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115 } |
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116 } |
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117 static void BlitBto3(SDL_BlitInfo *info) |
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118 { |
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119 int c, o; |
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120 int width, height; |
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121 Uint8 *src, *map, *dst; |
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122 int srcskip, dstskip; |
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123 |
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124 /* Set up some basic variables */ |
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125 width = info->d_width; |
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126 height = info->d_height; |
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127 src = info->s_pixels; |
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128 srcskip = info->s_skip; |
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129 dst = info->d_pixels; |
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130 dstskip = info->d_skip; |
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131 map = info->table; |
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132 srcskip += width-(width+7)/8; |
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133 |
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134 while ( height-- ) { |
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135 Uint8 byte = 0, bit; |
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136 for ( c=0; c<width; ++c ) { |
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137 if ( (c&7) == 0 ) { |
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138 byte = *src++; |
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139 } |
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140 bit = (byte&0x80)>>7; |
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141 if ( 1 ) { |
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142 o = bit * 4; |
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143 dst[0] = map[o++]; |
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144 dst[1] = map[o++]; |
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145 dst[2] = map[o++]; |
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146 } |
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147 byte <<= 1; |
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148 dst += 3; |
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149 } |
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150 src += srcskip; |
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151 dst += dstskip; |
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152 } |
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153 } |
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154 static void BlitBto4(SDL_BlitInfo *info) |
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155 { |
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156 int width, height; |
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157 Uint8 *src; |
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158 Uint32 *map, *dst; |
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159 int srcskip, dstskip; |
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160 int c; |
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161 |
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162 /* Set up some basic variables */ |
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163 width = info->d_width; |
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164 height = info->d_height; |
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165 src = info->s_pixels; |
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166 srcskip = info->s_skip; |
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167 dst = (Uint32 *)info->d_pixels; |
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168 dstskip = info->d_skip/4; |
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169 map = (Uint32 *)info->table; |
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170 srcskip += width-(width+7)/8; |
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171 |
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172 while ( height-- ) { |
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173 Uint8 byte = 0, bit; |
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174 for ( c=0; c<width; ++c ) { |
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175 if ( (c&7) == 0 ) { |
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176 byte = *src++; |
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177 } |
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178 bit = (byte&0x80)>>7; |
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179 if ( 1 ) { |
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180 *dst = map[bit]; |
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181 } |
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182 byte <<= 1; |
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183 dst++; |
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184 } |
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185 src += srcskip; |
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186 dst += dstskip; |
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187 } |
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188 } |
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189 |
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190 static void BlitBto1Key(SDL_BlitInfo *info) |
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191 { |
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192 int width = info->d_width; |
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193 int height = info->d_height; |
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194 Uint8 *src = info->s_pixels; |
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195 Uint8 *dst = info->d_pixels; |
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196 int srcskip = info->s_skip; |
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197 int dstskip = info->d_skip; |
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198 Uint32 ckey = info->src->colorkey; |
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199 Uint8 *palmap = info->table; |
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200 int c; |
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201 |
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202 /* Set up some basic variables */ |
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203 srcskip += width-(width+7)/8; |
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204 |
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205 if ( palmap ) { |
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206 while ( height-- ) { |
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207 Uint8 byte = 0, bit; |
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208 for ( c=0; c<width; ++c ) { |
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209 if ( (c&7) == 0 ) { |
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210 byte = *src++; |
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211 } |
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212 bit = (byte&0x80)>>7; |
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213 if ( bit != ckey ) { |
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214 *dst = palmap[bit]; |
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215 } |
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216 dst++; |
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217 byte <<= 1; |
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218 } |
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219 src += srcskip; |
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220 dst += dstskip; |
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221 } |
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222 } else { |
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223 while ( height-- ) { |
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224 Uint8 byte = 0, bit; |
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225 for ( c=0; c<width; ++c ) { |
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226 if ( (c&7) == 0 ) { |
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227 byte = *src++; |
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228 } |
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229 bit = (byte&0x80)>>7; |
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230 if ( bit != ckey ) { |
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231 *dst = bit; |
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232 } |
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233 dst++; |
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234 byte <<= 1; |
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235 } |
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236 src += srcskip; |
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237 dst += dstskip; |
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238 } |
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239 } |
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240 } |
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241 |
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242 static void BlitBto2Key(SDL_BlitInfo *info) |
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243 { |
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244 int width = info->d_width; |
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245 int height = info->d_height; |
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246 Uint8 *src = info->s_pixels; |
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247 Uint16 *dstp = (Uint16 *)info->d_pixels; |
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248 int srcskip = info->s_skip; |
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249 int dstskip = info->d_skip; |
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250 Uint32 ckey = info->src->colorkey; |
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251 Uint8 *palmap = info->table; |
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252 int c; |
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253 |
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254 /* Set up some basic variables */ |
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255 srcskip += width-(width+7)/8; |
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256 dstskip /= 2; |
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257 |
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258 while ( height-- ) { |
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259 Uint8 byte = 0, bit; |
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260 for ( c=0; c<width; ++c ) { |
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261 if ( (c&7) == 0 ) { |
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262 byte = *src++; |
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263 } |
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264 bit = (byte&0x80)>>7; |
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265 if ( bit != ckey ) { |
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266 *dstp=((Uint16 *)palmap)[bit]; |
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267 } |
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268 byte <<= 1; |
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269 dstp++; |
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270 } |
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271 src += srcskip; |
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272 dstp += dstskip; |
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273 } |
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274 } |
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275 |
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276 static void BlitBto3Key(SDL_BlitInfo *info) |
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277 { |
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278 int width = info->d_width; |
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279 int height = info->d_height; |
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280 Uint8 *src = info->s_pixels; |
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281 Uint8 *dst = info->d_pixels; |
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282 int srcskip = info->s_skip; |
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283 int dstskip = info->d_skip; |
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284 Uint32 ckey = info->src->colorkey; |
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285 Uint8 *palmap = info->table; |
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286 int c; |
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287 |
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288 /* Set up some basic variables */ |
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289 srcskip += width-(width+7)/8; |
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290 |
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291 while ( height-- ) { |
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292 Uint8 byte = 0, bit; |
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293 for ( c=0; c<width; ++c ) { |
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294 if ( (c&7) == 0 ) { |
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295 byte = *src++; |
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296 } |
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297 bit = (byte&0x80)>>7; |
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298 if ( bit != ckey ) { |
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299 SDL_memcpy(dst, &palmap[bit*4], 3); |
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300 } |
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301 byte <<= 1; |
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302 dst += 3; |
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303 } |
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304 src += srcskip; |
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305 dst += dstskip; |
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306 } |
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307 } |
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308 |
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309 static void BlitBto4Key(SDL_BlitInfo *info) |
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310 { |
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311 int width = info->d_width; |
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312 int height = info->d_height; |
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313 Uint8 *src = info->s_pixels; |
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314 Uint32 *dstp = (Uint32 *)info->d_pixels; |
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315 int srcskip = info->s_skip; |
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316 int dstskip = info->d_skip; |
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317 Uint32 ckey = info->src->colorkey; |
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318 Uint8 *palmap = info->table; |
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319 int c; |
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320 |
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321 /* Set up some basic variables */ |
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322 srcskip += width-(width+7)/8; |
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323 dstskip /= 4; |
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324 |
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325 while ( height-- ) { |
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326 Uint8 byte = 0, bit; |
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327 for ( c=0; c<width; ++c ) { |
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328 if ( (c&7) == 0 ) { |
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329 byte = *src++; |
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330 } |
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331 bit = (byte&0x80)>>7; |
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332 if ( bit != ckey ) { |
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333 *dstp=((Uint32 *)palmap)[bit]; |
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334 } |
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335 byte <<= 1; |
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336 dstp++; |
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337 } |
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338 src += srcskip; |
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339 dstp += dstskip; |
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340 } |
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341 } |
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342 |
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343 static void BlitBtoNAlpha(SDL_BlitInfo *info) |
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344 { |
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345 int width = info->d_width; |
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346 int height = info->d_height; |
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347 Uint8 *src = info->s_pixels; |
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348 Uint8 *dst = info->d_pixels; |
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349 int srcskip = info->s_skip; |
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350 int dstskip = info->d_skip; |
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351 const SDL_Color *srcpal = info->src->palette->colors; |
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352 SDL_PixelFormat *dstfmt = info->dst; |
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353 int dstbpp; |
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354 int c; |
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355 const int A = info->src->alpha; |
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356 |
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357 /* Set up some basic variables */ |
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358 dstbpp = dstfmt->BytesPerPixel; |
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359 srcskip += width-(width+7)/8; |
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360 |
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361 while ( height-- ) { |
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362 Uint8 byte = 0, bit; |
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363 for ( c=0; c<width; ++c ) { |
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364 if ( (c&7) == 0 ) { |
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365 byte = *src++; |
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366 } |
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367 bit = (byte&0x80)>>7; |
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368 if ( 1 ) { |
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369 Uint32 pixel; |
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370 unsigned sR, sG, sB; |
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371 unsigned dR, dG, dB; |
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372 sR = srcpal[bit].r; |
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373 sG = srcpal[bit].g; |
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374 sB = srcpal[bit].b; |
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375 DISEMBLE_RGB(dst, dstbpp, dstfmt, |
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376 pixel, dR, dG, dB); |
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377 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
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378 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
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379 } |
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380 byte <<= 1; |
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381 dst += dstbpp; |
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382 } |
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383 src += srcskip; |
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384 dst += dstskip; |
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385 } |
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386 } |
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387 |
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388 static void BlitBtoNAlphaKey(SDL_BlitInfo *info) |
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389 { |
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390 int width = info->d_width; |
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391 int height = info->d_height; |
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392 Uint8 *src = info->s_pixels; |
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393 Uint8 *dst = info->d_pixels; |
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394 int srcskip = info->s_skip; |
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395 int dstskip = info->d_skip; |
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396 SDL_PixelFormat *srcfmt = info->src; |
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397 SDL_PixelFormat *dstfmt = info->dst; |
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398 const SDL_Color *srcpal = srcfmt->palette->colors; |
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399 int dstbpp; |
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400 int c; |
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401 const int A = srcfmt->alpha; |
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402 Uint32 ckey = srcfmt->colorkey; |
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403 |
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404 /* Set up some basic variables */ |
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405 dstbpp = dstfmt->BytesPerPixel; |
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406 srcskip += width-(width+7)/8; |
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407 |
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408 while ( height-- ) { |
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409 Uint8 byte = 0, bit; |
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410 for ( c=0; c<width; ++c ) { |
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411 if ( (c&7) == 0 ) { |
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412 byte = *src++; |
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413 } |
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414 bit = (byte&0x80)>>7; |
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415 if ( bit != ckey ) { |
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416 int sR, sG, sB; |
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417 int dR, dG, dB; |
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418 Uint32 pixel; |
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419 sR = srcpal[bit].r; |
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420 sG = srcpal[bit].g; |
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421 sB = srcpal[bit].b; |
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422 DISEMBLE_RGB(dst, dstbpp, dstfmt, |
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423 pixel, dR, dG, dB); |
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424 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
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425 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
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426 } |
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427 byte <<= 1; |
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428 dst += dstbpp; |
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429 } |
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430 src += srcskip; |
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431 dst += dstskip; |
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432 } |
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433 } |
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434 |
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435 static SDL_loblit bitmap_blit[] = { |
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436 NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4 |
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437 }; |
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438 |
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439 static SDL_loblit colorkey_blit[] = { |
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440 NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key |
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441 }; |
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442 |
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443 SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index) |
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444 { |
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445 int which; |
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446 |
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447 if ( surface->format->BitsPerPixel != 1 ) { |
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448 /* We don't support sub 8-bit packed pixel modes */ |
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449 return NULL; |
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450 } |
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451 if ( surface->map->dst->format->BitsPerPixel < 8 ) { |
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452 which = 0; |
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453 } else { |
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454 which = surface->map->dst->format->BytesPerPixel; |
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455 } |
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456 switch(blit_index) { |
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457 case 0: /* copy */ |
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458 return bitmap_blit[which]; |
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459 |
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460 case 1: /* colorkey */ |
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461 return colorkey_blit[which]; |
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462 |
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463 case 2: /* alpha */ |
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464 return which >= 2 ? BlitBtoNAlpha : NULL; |
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465 |
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466 case 4: /* alpha + colorkey */ |
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467 return which >= 2 ? BlitBtoNAlphaKey : NULL; |
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468 } |
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469 return NULL; |
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470 } |
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471 |