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5131 | clevermous | 1 | /* |
2 | SDL - Simple DirectMedia Layer |
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3 | Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga |
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4 | |||
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 Library General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2 of the License, or (at your option) any later version. |
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9 | |||
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 | Library General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU Library General Public |
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16 | License along with this library; if not, write to the Free |
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17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 | |||
19 | Sam Lantinga |
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20 | slouken@devolution.com |
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21 | */ |
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22 | |||
23 | |||
24 | #include |
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25 | |||
26 | #include "SDL_types.h" |
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27 | #include "SDL_video.h" |
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28 | #include "SDL_blit.h" |
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29 | #include "SDL_sysvideo.h" |
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30 | #include "SDL_endian.h" |
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31 | |||
32 | /* Functions to blit from 8-bit surfaces to other surfaces */ |
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33 | |||
34 | static void Blit1to1(SDL_BlitInfo *info) |
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35 | { |
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36 | #ifndef USE_DUFFS_LOOP |
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37 | int c; |
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38 | #endif |
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39 | int width, height; |
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40 | Uint8 *src, *map, *dst; |
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41 | int srcskip, dstskip; |
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42 | |||
43 | /* Set up some basic variables */ |
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44 | width = info->d_width; |
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45 | height = info->d_height; |
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46 | src = info->s_pixels; |
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47 | srcskip = info->s_skip; |
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48 | dst = info->d_pixels; |
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49 | dstskip = info->d_skip; |
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50 | map = info->table; |
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51 | |||
52 | while ( height-- ) { |
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53 | #ifdef USE_DUFFS_LOOP |
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54 | DUFFS_LOOP( |
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55 | { |
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56 | *dst = map[*src]; |
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57 | } |
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58 | dst++; |
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59 | src++; |
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60 | , width); |
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61 | #else |
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62 | for ( c=width; c; --c ) { |
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63 | *dst = map[*src]; |
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64 | dst++; |
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65 | src++; |
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66 | } |
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67 | #endif |
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68 | src += srcskip; |
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69 | dst += dstskip; |
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70 | } |
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71 | } |
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72 | /* This is now endian dependent */ |
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73 | #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) |
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74 | #define HI 1 |
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75 | #define LO 0 |
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76 | #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */ |
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77 | #define HI 0 |
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78 | #define LO 1 |
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79 | #endif |
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80 | static void Blit1to2(SDL_BlitInfo *info) |
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81 | { |
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82 | #ifndef USE_DUFFS_LOOP |
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83 | int c; |
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84 | #endif |
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85 | int width, height; |
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86 | Uint8 *src, *dst; |
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87 | Uint16 *map; |
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88 | int srcskip, dstskip; |
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89 | |||
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 = info->d_pixels; |
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96 | dstskip = info->d_skip; |
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97 | map = (Uint16 *)info->table; |
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98 | |||
99 | #ifdef USE_DUFFS_LOOP |
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100 | while ( height-- ) { |
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101 | DUFFS_LOOP( |
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102 | { |
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103 | *(Uint16 *)dst = map[*src++]; |
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104 | dst += 2; |
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105 | }, |
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106 | width); |
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107 | src += srcskip; |
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108 | dst += dstskip; |
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109 | } |
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110 | #else |
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111 | /* Memory align at 4-byte boundary, if necessary */ |
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112 | if ( (long)dst & 0x03 ) { |
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113 | /* Don't do anything if width is 0 */ |
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114 | if ( width == 0 ) { |
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115 | return; |
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116 | } |
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117 | --width; |
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118 | |||
119 | while ( height-- ) { |
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120 | /* Perform copy alignment */ |
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121 | *(Uint16 *)dst = map[*src++]; |
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122 | dst += 2; |
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123 | |||
124 | /* Copy in 4 pixel chunks */ |
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125 | for ( c=width/4; c; --c ) { |
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126 | *(Uint32 *)dst = |
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127 | (map[src[HI]]<<16)|(map[src[LO]]); |
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128 | src += 2; |
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129 | dst += 4; |
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130 | *(Uint32 *)dst = |
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131 | (map[src[HI]]<<16)|(map[src[LO]]); |
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132 | src += 2; |
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133 | dst += 4; |
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134 | } |
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135 | /* Get any leftovers */ |
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136 | switch (width & 3) { |
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137 | case 3: |
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138 | *(Uint16 *)dst = map[*src++]; |
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139 | dst += 2; |
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140 | case 2: |
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141 | *(Uint32 *)dst = |
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142 | (map[src[HI]]<<16)|(map[src[LO]]); |
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143 | src += 2; |
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144 | dst += 4; |
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145 | break; |
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146 | case 1: |
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147 | *(Uint16 *)dst = map[*src++]; |
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148 | dst += 2; |
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149 | break; |
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150 | } |
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151 | src += srcskip; |
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152 | dst += dstskip; |
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153 | } |
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154 | } else { |
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155 | while ( height-- ) { |
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156 | /* Copy in 4 pixel chunks */ |
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157 | for ( c=width/4; c; --c ) { |
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158 | *(Uint32 *)dst = |
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159 | (map[src[HI]]<<16)|(map[src[LO]]); |
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160 | src += 2; |
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161 | dst += 4; |
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162 | *(Uint32 *)dst = |
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163 | (map[src[HI]]<<16)|(map[src[LO]]); |
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164 | src += 2; |
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165 | dst += 4; |
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166 | } |
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167 | /* Get any leftovers */ |
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168 | switch (width & 3) { |
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169 | case 3: |
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170 | *(Uint16 *)dst = map[*src++]; |
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171 | dst += 2; |
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172 | case 2: |
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173 | *(Uint32 *)dst = |
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174 | (map[src[HI]]<<16)|(map[src[LO]]); |
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175 | src += 2; |
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176 | dst += 4; |
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177 | break; |
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178 | case 1: |
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179 | *(Uint16 *)dst = map[*src++]; |
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180 | dst += 2; |
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181 | break; |
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182 | } |
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183 | src += srcskip; |
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184 | dst += dstskip; |
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185 | } |
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186 | } |
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187 | #endif /* USE_DUFFS_LOOP */ |
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188 | } |
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189 | static void Blit1to3(SDL_BlitInfo *info) |
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190 | { |
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191 | #ifndef USE_DUFFS_LOOP |
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192 | int c; |
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193 | #endif |
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194 | int o; |
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195 | int width, height; |
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196 | Uint8 *src, *map, *dst; |
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197 | int srcskip, dstskip; |
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198 | |||
199 | /* Set up some basic variables */ |
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200 | width = info->d_width; |
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201 | height = info->d_height; |
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202 | src = info->s_pixels; |
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203 | srcskip = info->s_skip; |
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204 | dst = info->d_pixels; |
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205 | dstskip = info->d_skip; |
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206 | map = info->table; |
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207 | |||
208 | while ( height-- ) { |
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209 | #ifdef USE_DUFFS_LOOP |
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210 | DUFFS_LOOP( |
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211 | { |
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212 | o = *src * 4; |
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213 | dst[0] = map[o++]; |
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214 | dst[1] = map[o++]; |
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215 | dst[2] = map[o++]; |
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216 | } |
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217 | src++; |
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218 | dst += 3; |
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219 | , width); |
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220 | #else |
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221 | for ( c=width; c; --c ) { |
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222 | o = *src * 4; |
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223 | dst[0] = map[o++]; |
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224 | dst[1] = map[o++]; |
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225 | dst[2] = map[o++]; |
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226 | src++; |
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227 | dst += 3; |
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228 | } |
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229 | #endif /* USE_DUFFS_LOOP */ |
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230 | src += srcskip; |
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231 | dst += dstskip; |
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232 | } |
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233 | } |
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234 | static void Blit1to4(SDL_BlitInfo *info) |
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235 | { |
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236 | #ifndef USE_DUFFS_LOOP |
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237 | int c; |
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238 | #endif |
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239 | int width, height; |
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240 | Uint8 *src; |
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241 | Uint32 *map, *dst; |
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242 | int srcskip, dstskip; |
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243 | |||
244 | /* Set up some basic variables */ |
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245 | width = info->d_width; |
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246 | height = info->d_height; |
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247 | src = info->s_pixels; |
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248 | srcskip = info->s_skip; |
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249 | dst = (Uint32 *)info->d_pixels; |
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250 | dstskip = info->d_skip/4; |
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251 | map = (Uint32 *)info->table; |
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252 | |||
253 | while ( height-- ) { |
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254 | #ifdef USE_DUFFS_LOOP |
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255 | DUFFS_LOOP( |
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256 | *dst++ = map[*src++]; |
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257 | , width); |
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258 | #else |
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259 | for ( c=width/4; c; --c ) { |
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260 | *dst++ = map[*src++]; |
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261 | *dst++ = map[*src++]; |
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262 | *dst++ = map[*src++]; |
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263 | *dst++ = map[*src++]; |
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264 | } |
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265 | switch ( width & 3 ) { |
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266 | case 3: |
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267 | *dst++ = map[*src++]; |
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268 | case 2: |
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269 | *dst++ = map[*src++]; |
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270 | case 1: |
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271 | *dst++ = map[*src++]; |
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272 | } |
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273 | #endif /* USE_DUFFS_LOOP */ |
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274 | src += srcskip; |
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275 | dst += dstskip; |
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276 | } |
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277 | } |
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278 | |||
279 | static void Blit1to1Key(SDL_BlitInfo *info) |
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280 | { |
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281 | int width = info->d_width; |
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282 | int height = info->d_height; |
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283 | Uint8 *src = info->s_pixels; |
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284 | int srcskip = info->s_skip; |
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285 | Uint8 *dst = info->d_pixels; |
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286 | int dstskip = info->d_skip; |
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287 | Uint8 *palmap = info->table; |
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288 | Uint32 ckey = info->src->colorkey; |
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289 | |||
290 | if ( palmap ) { |
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291 | while ( height-- ) { |
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292 | DUFFS_LOOP( |
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293 | { |
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294 | if ( *src != ckey ) { |
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295 | *dst = palmap[*src]; |
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296 | } |
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297 | dst++; |
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298 | src++; |
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299 | }, |
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300 | width); |
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301 | src += srcskip; |
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302 | dst += dstskip; |
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303 | } |
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304 | } else { |
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305 | while ( height-- ) { |
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306 | DUFFS_LOOP( |
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307 | { |
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308 | if ( *src != ckey ) { |
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309 | *dst = *src; |
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310 | } |
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311 | dst++; |
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312 | src++; |
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313 | }, |
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314 | width); |
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315 | src += srcskip; |
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316 | dst += dstskip; |
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317 | } |
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318 | } |
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319 | } |
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320 | |||
321 | static void Blit1to2Key(SDL_BlitInfo *info) |
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322 | { |
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323 | int width = info->d_width; |
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324 | int height = info->d_height; |
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325 | Uint8 *src = info->s_pixels; |
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326 | int srcskip = info->s_skip; |
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327 | Uint16 *dstp = (Uint16 *)info->d_pixels; |
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328 | int dstskip = info->d_skip; |
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329 | Uint16 *palmap = (Uint16 *)info->table; |
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330 | Uint32 ckey = info->src->colorkey; |
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331 | |||
332 | /* Set up some basic variables */ |
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333 | dstskip /= 2; |
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334 | |||
335 | while ( height-- ) { |
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336 | DUFFS_LOOP( |
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337 | { |
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338 | if ( *src != ckey ) { |
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339 | *dstp=palmap[*src]; |
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340 | } |
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341 | src++; |
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342 | dstp++; |
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343 | }, |
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344 | width); |
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345 | src += srcskip; |
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346 | dstp += dstskip; |
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347 | } |
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348 | } |
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349 | |||
350 | static void Blit1to3Key(SDL_BlitInfo *info) |
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351 | { |
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352 | int width = info->d_width; |
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353 | int height = info->d_height; |
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354 | Uint8 *src = info->s_pixels; |
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355 | int srcskip = info->s_skip; |
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356 | Uint8 *dst = info->d_pixels; |
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357 | int dstskip = info->d_skip; |
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358 | Uint8 *palmap = info->table; |
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359 | Uint32 ckey = info->src->colorkey; |
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360 | int o; |
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361 | |||
362 | while ( height-- ) { |
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363 | DUFFS_LOOP( |
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364 | { |
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365 | if ( *src != ckey ) { |
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366 | o = *src * 4; |
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367 | dst[0] = palmap[o++]; |
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368 | dst[1] = palmap[o++]; |
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369 | dst[2] = palmap[o++]; |
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370 | } |
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371 | src++; |
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372 | dst += 3; |
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373 | }, |
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374 | width); |
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375 | src += srcskip; |
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376 | dst += dstskip; |
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377 | } |
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378 | } |
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379 | |||
380 | static void Blit1to4Key(SDL_BlitInfo *info) |
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381 | { |
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382 | int width = info->d_width; |
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383 | int height = info->d_height; |
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384 | Uint8 *src = info->s_pixels; |
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385 | int srcskip = info->s_skip; |
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386 | Uint32 *dstp = (Uint32 *)info->d_pixels; |
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387 | int dstskip = info->d_skip; |
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388 | Uint32 *palmap = (Uint32 *)info->table; |
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389 | Uint32 ckey = info->src->colorkey; |
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390 | |||
391 | /* Set up some basic variables */ |
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392 | dstskip /= 4; |
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393 | |||
394 | while ( height-- ) { |
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395 | DUFFS_LOOP( |
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396 | { |
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397 | if ( *src != ckey ) { |
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398 | *dstp = palmap[*src]; |
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399 | } |
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400 | src++; |
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401 | dstp++; |
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402 | }, |
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403 | width); |
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404 | src += srcskip; |
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405 | dstp += dstskip; |
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406 | } |
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407 | } |
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408 | |||
409 | static void Blit1toNAlpha(SDL_BlitInfo *info) |
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410 | { |
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411 | int width = info->d_width; |
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412 | int height = info->d_height; |
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413 | Uint8 *src = info->s_pixels; |
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414 | int srcskip = info->s_skip; |
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415 | Uint8 *dst = info->d_pixels; |
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416 | int dstskip = info->d_skip; |
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417 | SDL_PixelFormat *dstfmt = info->dst; |
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418 | const SDL_Color *srcpal = info->src->palette->colors; |
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419 | int dstbpp; |
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420 | const int A = info->src->alpha; |
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421 | |||
422 | /* Set up some basic variables */ |
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423 | dstbpp = dstfmt->BytesPerPixel; |
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424 | |||
425 | while ( height-- ) { |
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426 | int sR, sG, sB; |
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427 | int dR, dG, dB; |
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428 | DUFFS_LOOP4( |
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429 | { |
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430 | Uint32 pixel; |
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431 | sR = srcpal[*src].r; |
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432 | sG = srcpal[*src].g; |
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433 | sB = srcpal[*src].b; |
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434 | DISEMBLE_RGB(dst, dstbpp, dstfmt, |
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435 | pixel, dR, dG, dB); |
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436 | ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
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437 | ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
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438 | src++; |
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439 | dst += dstbpp; |
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440 | }, |
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441 | width); |
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442 | src += srcskip; |
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443 | dst += dstskip; |
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444 | } |
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445 | } |
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446 | |||
447 | static void Blit1toNAlphaKey(SDL_BlitInfo *info) |
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448 | { |
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449 | int width = info->d_width; |
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450 | int height = info->d_height; |
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451 | Uint8 *src = info->s_pixels; |
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452 | int srcskip = info->s_skip; |
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453 | Uint8 *dst = info->d_pixels; |
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454 | int dstskip = info->d_skip; |
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455 | SDL_PixelFormat *srcfmt = info->src; |
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456 | SDL_PixelFormat *dstfmt = info->dst; |
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457 | const SDL_Color *srcpal = info->src->palette->colors; |
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458 | Uint32 ckey = srcfmt->colorkey; |
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459 | int dstbpp; |
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460 | const int A = srcfmt->alpha; |
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461 | |||
462 | /* Set up some basic variables */ |
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463 | dstbpp = dstfmt->BytesPerPixel; |
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464 | |||
465 | while ( height-- ) { |
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466 | int sR, sG, sB; |
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467 | int dR, dG, dB; |
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468 | DUFFS_LOOP( |
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469 | { |
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470 | if ( *src != ckey ) { |
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471 | Uint32 pixel; |
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472 | sR = srcpal[*src].r; |
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473 | sG = srcpal[*src].g; |
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474 | sB = srcpal[*src].b; |
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475 | DISEMBLE_RGB(dst, dstbpp, dstfmt, |
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476 | pixel, dR, dG, dB); |
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477 | ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
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478 | ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
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479 | } |
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480 | src++; |
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481 | dst += dstbpp; |
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482 | }, |
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483 | width); |
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484 | src += srcskip; |
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485 | dst += dstskip; |
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486 | } |
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487 | } |
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488 | |||
489 | static SDL_loblit one_blit[] = { |
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490 | NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4 |
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491 | }; |
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492 | |||
493 | static SDL_loblit one_blitkey[] = { |
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494 | NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key |
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495 | }; |
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496 | |||
497 | SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index) |
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498 | { |
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499 | int which; |
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500 | SDL_PixelFormat *dstfmt; |
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501 | |||
502 | dstfmt = surface->map->dst->format; |
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503 | if ( dstfmt->BitsPerPixel < 8 ) { |
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504 | which = 0; |
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505 | } else { |
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506 | which = dstfmt->BytesPerPixel; |
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507 | } |
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508 | switch(blit_index) { |
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509 | case 0: /* copy */ |
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510 | return one_blit[which]; |
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511 | |||
512 | case 1: /* colorkey */ |
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513 | return one_blitkey[which]; |
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514 | |||
515 | case 2: /* alpha */ |
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516 | /* Supporting 8bpp->8bpp alpha is doable but requires lots of |
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517 | tables which consume space and takes time to precompute, |
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518 | so is better left to the user */ |
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519 | return which >= 2 ? Blit1toNAlpha : NULL; |
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520 | |||
521 | case 3: /* alpha + colorkey */ |
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522 | return which >= 2 ? Blit1toNAlphaKey : NULL; |
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523 | |||
524 | } |
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525 | return NULL; |
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526 | }>16)|(map[src[LO]]); |