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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 #include "SDL_sysvideo.h" |
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27 #include "SDL_endian.h" |
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28 |
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29 /* Functions to blit from 8-bit surfaces to other surfaces */ |
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30 |
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31 static void Blit1to1(SDL_BlitInfo *info) |
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32 { |
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33 #ifndef USE_DUFFS_LOOP |
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34 int c; |
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35 #endif |
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36 int width, height; |
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37 Uint8 *src, *map, *dst; |
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38 int srcskip, dstskip; |
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39 |
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40 /* Set up some basic variables */ |
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41 width = info->d_width; |
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42 height = info->d_height; |
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43 src = info->s_pixels; |
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44 srcskip = info->s_skip; |
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45 dst = info->d_pixels; |
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46 dstskip = info->d_skip; |
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47 map = info->table; |
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48 |
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49 while ( height-- ) { |
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50 #ifdef USE_DUFFS_LOOP |
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51 DUFFS_LOOP( |
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52 { |
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53 *dst = map[*src]; |
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54 } |
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55 dst++; |
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56 src++; |
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57 , width); |
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58 #else |
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59 for ( c=width; c; --c ) { |
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60 *dst = map[*src]; |
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61 dst++; |
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62 src++; |
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63 } |
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64 #endif |
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65 src += srcskip; |
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66 dst += dstskip; |
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67 } |
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68 } |
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69 /* This is now endian dependent */ |
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70 #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) |
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71 #define HI 1 |
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72 #define LO 0 |
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73 #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */ |
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74 #define HI 0 |
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75 #define LO 1 |
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76 #endif |
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77 static void Blit1to2(SDL_BlitInfo *info) |
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78 { |
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79 #ifndef USE_DUFFS_LOOP |
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80 int c; |
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81 #endif |
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82 int width, height; |
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83 Uint8 *src, *dst; |
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84 Uint16 *map; |
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85 int srcskip, dstskip; |
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86 |
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87 /* Set up some basic variables */ |
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88 width = info->d_width; |
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89 height = info->d_height; |
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90 src = info->s_pixels; |
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91 srcskip = info->s_skip; |
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92 dst = info->d_pixels; |
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93 dstskip = info->d_skip; |
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94 map = (Uint16 *)info->table; |
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95 |
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96 #ifdef USE_DUFFS_LOOP |
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97 while ( height-- ) { |
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98 DUFFS_LOOP( |
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99 { |
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100 *(Uint16 *)dst = map[*src++]; |
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101 dst += 2; |
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102 }, |
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103 width); |
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104 src += srcskip; |
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105 dst += dstskip; |
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106 } |
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107 #else |
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108 /* Memory align at 4-byte boundary, if necessary */ |
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109 if ( (long)dst & 0x03 ) { |
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110 /* Don't do anything if width is 0 */ |
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111 if ( width == 0 ) { |
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112 return; |
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113 } |
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114 --width; |
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115 |
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116 while ( height-- ) { |
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117 /* Perform copy alignment */ |
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118 *(Uint16 *)dst = map[*src++]; |
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119 dst += 2; |
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120 |
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121 /* Copy in 4 pixel chunks */ |
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122 for ( c=width/4; c; --c ) { |
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123 *(Uint32 *)dst = |
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124 (map[src[HI]]<<16)|(map[src[LO]]); |
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125 src += 2; |
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126 dst += 4; |
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127 *(Uint32 *)dst = |
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128 (map[src[HI]]<<16)|(map[src[LO]]); |
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129 src += 2; |
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130 dst += 4; |
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131 } |
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132 /* Get any leftovers */ |
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133 switch (width & 3) { |
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134 case 3: |
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135 *(Uint16 *)dst = map[*src++]; |
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136 dst += 2; |
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137 case 2: |
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138 *(Uint32 *)dst = |
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139 (map[src[HI]]<<16)|(map[src[LO]]); |
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140 src += 2; |
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141 dst += 4; |
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142 break; |
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143 case 1: |
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144 *(Uint16 *)dst = map[*src++]; |
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145 dst += 2; |
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146 break; |
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147 } |
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148 src += srcskip; |
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149 dst += dstskip; |
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150 } |
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151 } else { |
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152 while ( height-- ) { |
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153 /* Copy in 4 pixel chunks */ |
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154 for ( c=width/4; c; --c ) { |
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155 *(Uint32 *)dst = |
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156 (map[src[HI]]<<16)|(map[src[LO]]); |
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157 src += 2; |
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158 dst += 4; |
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159 *(Uint32 *)dst = |
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160 (map[src[HI]]<<16)|(map[src[LO]]); |
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161 src += 2; |
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162 dst += 4; |
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163 } |
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164 /* Get any leftovers */ |
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165 switch (width & 3) { |
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166 case 3: |
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167 *(Uint16 *)dst = map[*src++]; |
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168 dst += 2; |
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169 case 2: |
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170 *(Uint32 *)dst = |
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171 (map[src[HI]]<<16)|(map[src[LO]]); |
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172 src += 2; |
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173 dst += 4; |
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174 break; |
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175 case 1: |
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176 *(Uint16 *)dst = map[*src++]; |
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177 dst += 2; |
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178 break; |
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179 } |
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180 src += srcskip; |
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181 dst += dstskip; |
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182 } |
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183 } |
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184 #endif /* USE_DUFFS_LOOP */ |
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185 } |
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186 static void Blit1to3(SDL_BlitInfo *info) |
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187 { |
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188 #ifndef USE_DUFFS_LOOP |
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189 int c; |
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190 #endif |
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191 int o; |
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192 int width, height; |
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193 Uint8 *src, *map, *dst; |
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194 int srcskip, dstskip; |
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195 |
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196 /* Set up some basic variables */ |
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197 width = info->d_width; |
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198 height = info->d_height; |
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199 src = info->s_pixels; |
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200 srcskip = info->s_skip; |
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201 dst = info->d_pixels; |
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202 dstskip = info->d_skip; |
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203 map = info->table; |
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204 |
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205 while ( height-- ) { |
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206 #ifdef USE_DUFFS_LOOP |
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207 DUFFS_LOOP( |
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208 { |
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209 o = *src * 4; |
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210 dst[0] = map[o++]; |
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211 dst[1] = map[o++]; |
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212 dst[2] = map[o++]; |
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213 } |
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214 src++; |
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215 dst += 3; |
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216 , width); |
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217 #else |
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218 for ( c=width; c; --c ) { |
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219 o = *src * 4; |
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220 dst[0] = map[o++]; |
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221 dst[1] = map[o++]; |
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222 dst[2] = map[o++]; |
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223 src++; |
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224 dst += 3; |
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225 } |
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226 #endif /* USE_DUFFS_LOOP */ |
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227 src += srcskip; |
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228 dst += dstskip; |
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229 } |
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230 } |
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231 static void Blit1to4(SDL_BlitInfo *info) |
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232 { |
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233 #ifndef USE_DUFFS_LOOP |
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234 int c; |
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235 #endif |
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236 int width, height; |
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237 Uint8 *src; |
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238 Uint32 *map, *dst; |
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239 int srcskip, dstskip; |
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240 |
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241 /* Set up some basic variables */ |
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242 width = info->d_width; |
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243 height = info->d_height; |
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244 src = info->s_pixels; |
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245 srcskip = info->s_skip; |
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246 dst = (Uint32 *)info->d_pixels; |
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247 dstskip = info->d_skip/4; |
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248 map = (Uint32 *)info->table; |
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249 |
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250 while ( height-- ) { |
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251 #ifdef USE_DUFFS_LOOP |
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252 DUFFS_LOOP( |
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253 *dst++ = map[*src++]; |
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254 , width); |
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255 #else |
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256 for ( c=width/4; c; --c ) { |
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257 *dst++ = map[*src++]; |
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258 *dst++ = map[*src++]; |
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259 *dst++ = map[*src++]; |
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260 *dst++ = map[*src++]; |
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261 } |
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262 switch ( width & 3 ) { |
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263 case 3: |
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264 *dst++ = map[*src++]; |
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265 case 2: |
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266 *dst++ = map[*src++]; |
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267 case 1: |
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268 *dst++ = map[*src++]; |
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269 } |
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270 #endif /* USE_DUFFS_LOOP */ |
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271 src += srcskip; |
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272 dst += dstskip; |
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273 } |
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274 } |
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275 |
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276 static void Blit1to1Key(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 int srcskip = info->s_skip; |
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282 Uint8 *dst = info->d_pixels; |
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283 int dstskip = info->d_skip; |
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284 Uint8 *palmap = info->table; |
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285 Uint32 ckey = info->src->colorkey; |
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286 |
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287 if ( palmap ) { |
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288 while ( height-- ) { |
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289 DUFFS_LOOP( |
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290 { |
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291 if ( *src != ckey ) { |
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292 *dst = palmap[*src]; |
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293 } |
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294 dst++; |
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295 src++; |
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296 }, |
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297 width); |
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298 src += srcskip; |
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299 dst += dstskip; |
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300 } |
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301 } else { |
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302 while ( height-- ) { |
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303 DUFFS_LOOP( |
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304 { |
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305 if ( *src != ckey ) { |
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306 *dst = *src; |
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307 } |
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308 dst++; |
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309 src++; |
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310 }, |
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311 width); |
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312 src += srcskip; |
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313 dst += dstskip; |
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314 } |
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315 } |
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316 } |
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317 |
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318 static void Blit1to2Key(SDL_BlitInfo *info) |
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319 { |
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320 int width = info->d_width; |
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321 int height = info->d_height; |
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322 Uint8 *src = info->s_pixels; |
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323 int srcskip = info->s_skip; |
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324 Uint16 *dstp = (Uint16 *)info->d_pixels; |
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325 int dstskip = info->d_skip; |
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326 Uint16 *palmap = (Uint16 *)info->table; |
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327 Uint32 ckey = info->src->colorkey; |
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328 |
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329 /* Set up some basic variables */ |
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330 dstskip /= 2; |
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331 |
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332 while ( height-- ) { |
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333 DUFFS_LOOP( |
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334 { |
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335 if ( *src != ckey ) { |
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336 *dstp=palmap[*src]; |
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337 } |
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338 src++; |
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339 dstp++; |
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340 }, |
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341 width); |
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342 src += srcskip; |
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343 dstp += dstskip; |
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344 } |
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345 } |
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346 |
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347 static void Blit1to3Key(SDL_BlitInfo *info) |
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348 { |
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349 int width = info->d_width; |
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350 int height = info->d_height; |
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351 Uint8 *src = info->s_pixels; |
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352 int srcskip = info->s_skip; |
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353 Uint8 *dst = info->d_pixels; |
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354 int dstskip = info->d_skip; |
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355 Uint8 *palmap = info->table; |
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356 Uint32 ckey = info->src->colorkey; |
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357 int o; |
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358 |
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359 while ( height-- ) { |
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360 DUFFS_LOOP( |
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361 { |
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362 if ( *src != ckey ) { |
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363 o = *src * 4; |
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364 dst[0] = palmap[o++]; |
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365 dst[1] = palmap[o++]; |
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366 dst[2] = palmap[o++]; |
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367 } |
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368 src++; |
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369 dst += 3; |
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370 }, |
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371 width); |
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372 src += srcskip; |
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373 dst += dstskip; |
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374 } |
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375 } |
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376 |
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377 static void Blit1to4Key(SDL_BlitInfo *info) |
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378 { |
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379 int width = info->d_width; |
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380 int height = info->d_height; |
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381 Uint8 *src = info->s_pixels; |
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382 int srcskip = info->s_skip; |
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383 Uint32 *dstp = (Uint32 *)info->d_pixels; |
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384 int dstskip = info->d_skip; |
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385 Uint32 *palmap = (Uint32 *)info->table; |
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386 Uint32 ckey = info->src->colorkey; |
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387 |
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388 /* Set up some basic variables */ |
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389 dstskip /= 4; |
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390 |
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391 while ( height-- ) { |
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392 DUFFS_LOOP( |
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393 { |
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394 if ( *src != ckey ) { |
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395 *dstp = palmap[*src]; |
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396 } |
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397 src++; |
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398 dstp++; |
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399 }, |
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400 width); |
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401 src += srcskip; |
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402 dstp += dstskip; |
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403 } |
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404 } |
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405 |
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406 static void Blit1toNAlpha(SDL_BlitInfo *info) |
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407 { |
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408 int width = info->d_width; |
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409 int height = info->d_height; |
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410 Uint8 *src = info->s_pixels; |
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411 int srcskip = info->s_skip; |
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412 Uint8 *dst = info->d_pixels; |
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413 int dstskip = info->d_skip; |
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414 SDL_PixelFormat *dstfmt = info->dst; |
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415 const SDL_Color *srcpal = info->src->palette->colors; |
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416 int dstbpp; |
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417 const int A = info->src->alpha; |
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418 |
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419 /* Set up some basic variables */ |
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420 dstbpp = dstfmt->BytesPerPixel; |
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421 |
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422 while ( height-- ) { |
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423 int sR, sG, sB; |
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424 int dR, dG, dB; |
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425 DUFFS_LOOP4( |
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426 { |
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427 Uint32 pixel; |
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428 sR = srcpal[*src].r; |
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429 sG = srcpal[*src].g; |
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430 sB = srcpal[*src].b; |
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431 DISEMBLE_RGB(dst, dstbpp, dstfmt, |
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432 pixel, dR, dG, dB); |
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433 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
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434 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
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435 src++; |
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436 dst += dstbpp; |
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437 }, |
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438 width); |
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439 src += srcskip; |
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440 dst += dstskip; |
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441 } |
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442 } |
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443 |
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444 static void Blit1toNAlphaKey(SDL_BlitInfo *info) |
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445 { |
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446 int width = info->d_width; |
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447 int height = info->d_height; |
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448 Uint8 *src = info->s_pixels; |
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449 int srcskip = info->s_skip; |
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450 Uint8 *dst = info->d_pixels; |
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451 int dstskip = info->d_skip; |
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452 SDL_PixelFormat *srcfmt = info->src; |
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453 SDL_PixelFormat *dstfmt = info->dst; |
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454 const SDL_Color *srcpal = info->src->palette->colors; |
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455 Uint32 ckey = srcfmt->colorkey; |
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456 int dstbpp; |
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457 const int A = srcfmt->alpha; |
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458 |
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459 /* Set up some basic variables */ |
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460 dstbpp = dstfmt->BytesPerPixel; |
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461 |
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462 while ( height-- ) { |
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463 int sR, sG, sB; |
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464 int dR, dG, dB; |
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465 DUFFS_LOOP( |
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466 { |
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467 if ( *src != ckey ) { |
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468 Uint32 pixel; |
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469 sR = srcpal[*src].r; |
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470 sG = srcpal[*src].g; |
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471 sB = srcpal[*src].b; |
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472 DISEMBLE_RGB(dst, dstbpp, dstfmt, |
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473 pixel, dR, dG, dB); |
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474 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
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475 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
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476 } |
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477 src++; |
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478 dst += dstbpp; |
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479 }, |
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480 width); |
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481 src += srcskip; |
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482 dst += dstskip; |
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483 } |
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484 } |
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485 |
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486 static SDL_loblit one_blit[] = { |
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487 NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4 |
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488 }; |
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489 |
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490 static SDL_loblit one_blitkey[] = { |
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491 NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key |
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492 }; |
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493 |
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494 SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index) |
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495 { |
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496 int which; |
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497 SDL_PixelFormat *dstfmt; |
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498 |
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499 dstfmt = surface->map->dst->format; |
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500 if ( dstfmt->BitsPerPixel < 8 ) { |
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501 which = 0; |
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502 } else { |
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503 which = dstfmt->BytesPerPixel; |
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504 } |
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505 switch(blit_index) { |
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506 case 0: /* copy */ |
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507 return one_blit[which]; |
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508 |
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509 case 1: /* colorkey */ |
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510 return one_blitkey[which]; |
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511 |
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512 case 2: /* alpha */ |
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513 /* Supporting 8bpp->8bpp alpha is doable but requires lots of |
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514 tables which consume space and takes time to precompute, |
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515 so is better left to the user */ |
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516 return which >= 2 ? Blit1toNAlpha : NULL; |
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517 |
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518 case 3: /* alpha + colorkey */ |
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519 return which >= 2 ? Blit1toNAlphaKey : NULL; |
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520 |
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521 } |
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522 return NULL; |
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523 } |