Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 4266:62849663f20a SDL-1.2
Removed duplicate memset() calls.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 29 Sep 2009 13:40:34 +0000 |
| parents | 34068be6aa0b |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 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 Lesser General Public |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* General (mostly internal) pixel/color manipulation routines for SDL */ | |
| 25 | |
| 26 #include "SDL_endian.h" | |
| 27 #include "SDL_video.h" | |
| 28 #include "SDL_sysvideo.h" | |
| 29 #include "SDL_blit.h" | |
| 30 #include "SDL_pixels_c.h" | |
| 31 #include "SDL_RLEaccel_c.h" | |
| 32 | |
| 33 /* Helper functions */ | |
| 34 /* | |
| 35 * Allocate a pixel format structure and fill it according to the given info. | |
| 36 */ | |
| 37 SDL_PixelFormat *SDL_AllocFormat(int bpp, | |
| 38 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 39 { | |
| 40 SDL_PixelFormat *format; | |
| 41 Uint32 mask; | |
| 42 | |
| 43 /* Allocate an empty pixel format structure */ | |
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44 format = SDL_malloc(sizeof(*format)); |
| 0 | 45 if ( format == NULL ) { |
| 46 SDL_OutOfMemory(); | |
| 47 return(NULL); | |
| 48 } | |
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49 SDL_memset(format, 0, sizeof(*format)); |
| 0 | 50 format->alpha = SDL_ALPHA_OPAQUE; |
| 51 | |
| 52 /* Set up the format */ | |
| 53 format->BitsPerPixel = bpp; | |
| 54 format->BytesPerPixel = (bpp+7)/8; | |
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55 if ( Rmask || Bmask || Gmask ) { /* Packed pixels with custom mask */ |
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56 format->palette = NULL; |
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57 format->Rshift = 0; |
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58 format->Rloss = 8; |
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59 if ( Rmask ) { |
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60 for ( mask = Rmask; !(mask&0x01); mask >>= 1 ) |
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61 ++format->Rshift; |
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62 for ( ; (mask&0x01); mask >>= 1 ) |
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63 --format->Rloss; |
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64 } |
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65 format->Gshift = 0; |
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66 format->Gloss = 8; |
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67 if ( Gmask ) { |
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68 for ( mask = Gmask; !(mask&0x01); mask >>= 1 ) |
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69 ++format->Gshift; |
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70 for ( ; (mask&0x01); mask >>= 1 ) |
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71 --format->Gloss; |
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72 } |
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73 format->Bshift = 0; |
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74 format->Bloss = 8; |
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75 if ( Bmask ) { |
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76 for ( mask = Bmask; !(mask&0x01); mask >>= 1 ) |
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77 ++format->Bshift; |
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78 for ( ; (mask&0x01); mask >>= 1 ) |
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79 --format->Bloss; |
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80 } |
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81 format->Ashift = 0; |
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82 format->Aloss = 8; |
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83 if ( Amask ) { |
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84 for ( mask = Amask; !(mask&0x01); mask >>= 1 ) |
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85 ++format->Ashift; |
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86 for ( ; (mask&0x01); mask >>= 1 ) |
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87 --format->Aloss; |
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88 } |
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89 format->Rmask = Rmask; |
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90 format->Gmask = Gmask; |
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91 format->Bmask = Bmask; |
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92 format->Amask = Amask; |
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93 } else if ( bpp > 8 ) { /* Packed pixels with standard mask */ |
| 0 | 94 /* R-G-B */ |
| 95 if ( bpp > 24 ) | |
| 96 bpp = 24; | |
| 97 format->Rloss = 8-(bpp/3); | |
| 98 format->Gloss = 8-(bpp/3)-(bpp%3); | |
| 99 format->Bloss = 8-(bpp/3); | |
| 100 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3); | |
| 101 format->Gshift = (bpp/3); | |
| 102 format->Bshift = 0; | |
| 103 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift); | |
| 104 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift); | |
| 105 format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift); | |
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106 } else { |
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107 /* Palettized formats have no mask info */ |
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108 format->Rloss = 8; |
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109 format->Gloss = 8; |
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110 format->Bloss = 8; |
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111 format->Aloss = 8; |
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112 format->Rshift = 0; |
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113 format->Gshift = 0; |
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114 format->Bshift = 0; |
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115 format->Ashift = 0; |
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116 format->Rmask = 0; |
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117 format->Gmask = 0; |
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118 format->Bmask = 0; |
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119 format->Amask = 0; |
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120 } |
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121 if ( bpp <= 8 ) { /* Palettized mode */ |
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122 int ncolors = 1<<bpp; |
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123 #ifdef DEBUG_PALETTE |
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124 fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors); |
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125 #endif |
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126 format->palette = (SDL_Palette *)SDL_malloc(sizeof(SDL_Palette)); |
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127 if ( format->palette == NULL ) { |
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128 SDL_FreeFormat(format); |
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129 SDL_OutOfMemory(); |
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130 return(NULL); |
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131 } |
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132 (format->palette)->ncolors = ncolors; |
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133 (format->palette)->colors = (SDL_Color *)SDL_malloc( |
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134 (format->palette)->ncolors*sizeof(SDL_Color)); |
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135 if ( (format->palette)->colors == NULL ) { |
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136 SDL_FreeFormat(format); |
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137 SDL_OutOfMemory(); |
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138 return(NULL); |
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139 } |
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140 if ( Rmask || Bmask || Gmask ) { |
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141 /* create palette according to masks */ |
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142 int i; |
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143 int Rm=0,Gm=0,Bm=0; |
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144 int Rw=0,Gw=0,Bw=0; |
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145 #ifdef ENABLE_PALETTE_ALPHA |
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146 int Am=0,Aw=0; |
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147 #endif |
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148 if(Rmask) |
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149 { |
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150 Rw=8-format->Rloss; |
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151 for(i=format->Rloss;i>0;i-=Rw) |
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152 Rm|=1<<i; |
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153 } |
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154 #ifdef DEBUG_PALETTE |
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155 fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm); |
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156 #endif |
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157 if(Gmask) |
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158 { |
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159 Gw=8-format->Gloss; |
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160 for(i=format->Gloss;i>0;i-=Gw) |
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161 Gm|=1<<i; |
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162 } |
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163 #ifdef DEBUG_PALETTE |
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164 fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm); |
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165 #endif |
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166 if(Bmask) |
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167 { |
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168 Bw=8-format->Bloss; |
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169 for(i=format->Bloss;i>0;i-=Bw) |
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170 Bm|=1<<i; |
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171 } |
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172 #ifdef DEBUG_PALETTE |
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173 fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm); |
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174 #endif |
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175 #ifdef ENABLE_PALETTE_ALPHA |
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176 if(Amask) |
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177 { |
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178 Aw=8-format->Aloss; |
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179 for(i=format->Aloss;i>0;i-=Aw) |
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180 Am|=1<<i; |
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181 } |
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182 # ifdef DEBUG_PALETTE |
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183 fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am); |
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184 # endif |
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185 #endif |
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186 for(i=0; i < ncolors; ++i) { |
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187 int r,g,b; |
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188 r=(i&Rmask)>>format->Rshift; |
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189 r=(r<<format->Rloss)|((r*Rm)>>Rw); |
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190 format->palette->colors[i].r=r; |
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191 |
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192 g=(i&Gmask)>>format->Gshift; |
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193 g=(g<<format->Gloss)|((g*Gm)>>Gw); |
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194 format->palette->colors[i].g=g; |
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195 |
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196 b=(i&Bmask)>>format->Bshift; |
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197 b=(b<<format->Bloss)|((b*Bm)>>Bw); |
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198 format->palette->colors[i].b=b; |
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199 |
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200 #ifdef ENABLE_PALETTE_ALPHA |
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201 a=(i&Amask)>>format->Ashift; |
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202 a=(a<<format->Aloss)|((a*Am)>>Aw); |
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203 format->palette->colors[i].unused=a; |
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204 #else |
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205 format->palette->colors[i].unused=0; |
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206 #endif |
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207 } |
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208 } else if ( ncolors == 2 ) { |
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209 /* Create a black and white bitmap palette */ |
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210 format->palette->colors[0].r = 0xFF; |
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211 format->palette->colors[0].g = 0xFF; |
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212 format->palette->colors[0].b = 0xFF; |
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213 format->palette->colors[1].r = 0x00; |
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214 format->palette->colors[1].g = 0x00; |
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215 format->palette->colors[1].b = 0x00; |
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216 } else { |
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217 /* Create an empty palette */ |
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218 SDL_memset((format->palette)->colors, 0, |
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219 (format->palette)->ncolors*sizeof(SDL_Color)); |
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220 } |
| 0 | 221 } |
| 222 return(format); | |
| 223 } | |
| 224 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp, | |
| 225 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 226 { | |
| 227 if ( surface->format ) { | |
| 228 SDL_FreeFormat(surface->format); | |
| 229 SDL_FormatChanged(surface); | |
| 230 } | |
| 231 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask); | |
| 232 return surface->format; | |
| 233 } | |
| 234 | |
| 235 /* | |
| 236 * Change any previous mappings from/to the new surface format | |
| 237 */ | |
| 238 void SDL_FormatChanged(SDL_Surface *surface) | |
| 239 { | |
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240 static int format_version = 0; |
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241 ++format_version; |
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242 if ( format_version < 0 ) { /* It wrapped... */ |
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243 format_version = 1; |
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244 } |
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245 surface->format_version = format_version; |
| 0 | 246 SDL_InvalidateMap(surface->map); |
| 247 } | |
| 248 /* | |
| 249 * Free a previously allocated format structure | |
| 250 */ | |
| 251 void SDL_FreeFormat(SDL_PixelFormat *format) | |
| 252 { | |
| 253 if ( format ) { | |
| 254 if ( format->palette ) { | |
| 255 if ( format->palette->colors ) { | |
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256 SDL_free(format->palette->colors); |
| 0 | 257 } |
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258 SDL_free(format->palette); |
| 0 | 259 } |
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260 SDL_free(format); |
| 0 | 261 } |
| 262 } | |
| 263 /* | |
| 264 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors | |
| 265 */ | |
| 266 void SDL_DitherColors(SDL_Color *colors, int bpp) | |
| 267 { | |
| 268 int i; | |
| 269 if(bpp != 8) | |
| 270 return; /* only 8bpp supported right now */ | |
| 271 | |
| 272 for(i = 0; i < 256; i++) { | |
| 273 int r, g, b; | |
| 274 /* map each bit field to the full [0, 255] interval, | |
| 275 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */ | |
| 276 r = i & 0xe0; | |
| 277 r |= r >> 3 | r >> 6; | |
| 278 colors[i].r = r; | |
| 279 g = (i << 3) & 0xe0; | |
| 280 g |= g >> 3 | g >> 6; | |
| 281 colors[i].g = g; | |
| 282 b = i & 0x3; | |
| 283 b |= b << 2; | |
| 284 b |= b << 4; | |
| 285 colors[i].b = b; | |
| 286 } | |
| 287 } | |
| 288 /* | |
| 289 * Calculate the pad-aligned scanline width of a surface | |
| 290 */ | |
| 291 Uint16 SDL_CalculatePitch(SDL_Surface *surface) | |
| 292 { | |
| 293 Uint16 pitch; | |
| 294 | |
| 295 /* Surface should be 4-byte aligned for speed */ | |
| 296 pitch = surface->w*surface->format->BytesPerPixel; | |
| 297 switch (surface->format->BitsPerPixel) { | |
| 298 case 1: | |
| 299 pitch = (pitch+7)/8; | |
| 300 break; | |
| 301 case 4: | |
| 302 pitch = (pitch+1)/2; | |
| 303 break; | |
| 304 default: | |
| 305 break; | |
| 306 } | |
| 307 pitch = (pitch + 3) & ~3; /* 4-byte aligning */ | |
| 308 return(pitch); | |
| 309 } | |
| 310 /* | |
| 311 * Match an RGB value to a particular palette index | |
| 312 */ | |
| 313 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b) | |
| 314 { | |
| 315 /* Do colorspace distance matching */ | |
| 316 unsigned int smallest; | |
| 317 unsigned int distance; | |
| 318 int rd, gd, bd; | |
| 319 int i; | |
| 320 Uint8 pixel=0; | |
| 321 | |
| 322 smallest = ~0; | |
| 323 for ( i=0; i<pal->ncolors; ++i ) { | |
| 324 rd = pal->colors[i].r - r; | |
| 325 gd = pal->colors[i].g - g; | |
| 326 bd = pal->colors[i].b - b; | |
| 327 distance = (rd*rd)+(gd*gd)+(bd*bd); | |
| 328 if ( distance < smallest ) { | |
| 329 pixel = i; | |
| 330 if ( distance == 0 ) { /* Perfect match! */ | |
| 331 break; | |
| 332 } | |
| 333 smallest = distance; | |
| 334 } | |
| 335 } | |
| 336 return(pixel); | |
| 337 } | |
| 338 | |
| 339 /* Find the opaque pixel value corresponding to an RGB triple */ | |
|
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340 Uint32 SDL_MapRGB |
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341 (const SDL_PixelFormat * const format, |
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342 const Uint8 r, const Uint8 g, const Uint8 b) |
| 0 | 343 { |
| 344 if ( format->palette == NULL ) { | |
| 345 return (r >> format->Rloss) << format->Rshift | |
| 346 | (g >> format->Gloss) << format->Gshift | |
| 347 | (b >> format->Bloss) << format->Bshift | |
| 348 | format->Amask; | |
| 349 } else { | |
| 350 return SDL_FindColor(format->palette, r, g, b); | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 /* Find the pixel value corresponding to an RGBA quadruple */ | |
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355 Uint32 SDL_MapRGBA |
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356 (const SDL_PixelFormat * const format, |
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357 const Uint8 r, const Uint8 g, const Uint8 b, const Uint8 a) |
| 0 | 358 { |
| 359 if ( format->palette == NULL ) { | |
| 360 return (r >> format->Rloss) << format->Rshift | |
| 361 | (g >> format->Gloss) << format->Gshift | |
| 362 | (b >> format->Bloss) << format->Bshift | |
| 363 | ((a >> format->Aloss) << format->Ashift & format->Amask); | |
| 364 } else { | |
| 365 return SDL_FindColor(format->palette, r, g, b); | |
| 366 } | |
| 367 } | |
| 368 | |
| 4173 | 369 void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * const fmt, |
| 0 | 370 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) |
| 371 { | |
| 372 if ( fmt->palette == NULL ) { | |
| 373 /* | |
| 374 * This makes sure that the result is mapped to the | |
| 375 * interval [0..255], and the maximum value for each | |
| 376 * component is 255. This is important to make sure | |
| 377 * that white is indeed reported as (255, 255, 255), | |
| 378 * and that opaque alpha is 255. | |
| 379 * This only works for RGB bit fields at least 4 bit | |
| 380 * wide, which is almost always the case. | |
| 381 */ | |
|
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382 unsigned v; |
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383 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
|
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384 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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385 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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386 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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387 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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388 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 389 if(fmt->Amask) { |
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390 v = (pixel & fmt->Amask) >> fmt->Ashift; |
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391 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); |
| 695 | 392 } else { |
| 0 | 393 *a = SDL_ALPHA_OPAQUE; |
| 695 | 394 } |
| 0 | 395 } else { |
| 396 *r = fmt->palette->colors[pixel].r; | |
| 397 *g = fmt->palette->colors[pixel].g; | |
| 398 *b = fmt->palette->colors[pixel].b; | |
| 399 *a = SDL_ALPHA_OPAQUE; | |
| 400 } | |
| 401 } | |
| 402 | |
| 4173 | 403 void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * const fmt, |
| 404 Uint8 *r,Uint8 *g,Uint8 *b) | |
| 0 | 405 { |
| 406 if ( fmt->palette == NULL ) { | |
| 407 /* the note for SDL_GetRGBA above applies here too */ | |
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408 unsigned v; |
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409 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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410 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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411 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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412 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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413 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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414 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 415 } else { |
| 416 *r = fmt->palette->colors[pixel].r; | |
| 417 *g = fmt->palette->colors[pixel].g; | |
| 418 *b = fmt->palette->colors[pixel].b; | |
| 419 } | |
| 420 } | |
| 421 | |
| 422 /* Apply gamma to a set of colors - this is easy. :) */ | |
| 423 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, | |
| 424 int ncolors) | |
| 425 { | |
| 426 int i; | |
| 427 | |
| 428 for ( i=0; i<ncolors; ++i ) { | |
| 429 output[i].r = gamma[0*256 + colors[i].r] >> 8; | |
| 430 output[i].g = gamma[1*256 + colors[i].g] >> 8; | |
| 431 output[i].b = gamma[2*256 + colors[i].b] >> 8; | |
| 432 } | |
| 433 } | |
| 434 | |
| 435 /* Map from Palette to Palette */ | |
| 436 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) | |
| 437 { | |
| 438 Uint8 *map; | |
| 439 int i; | |
| 440 | |
| 441 if ( identical ) { | |
| 442 if ( src->ncolors <= dst->ncolors ) { | |
| 443 /* If an identical palette, no need to map */ | |
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444 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors* |
| 0 | 445 sizeof(SDL_Color)) == 0 ) { |
| 446 *identical = 1; | |
| 447 return(NULL); | |
| 448 } | |
| 449 } | |
| 450 *identical = 0; | |
| 451 } | |
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452 map = (Uint8 *)SDL_malloc(src->ncolors); |
| 0 | 453 if ( map == NULL ) { |
| 454 SDL_OutOfMemory(); | |
| 455 return(NULL); | |
| 456 } | |
| 457 for ( i=0; i<src->ncolors; ++i ) { | |
| 458 map[i] = SDL_FindColor(dst, | |
| 459 src->colors[i].r, src->colors[i].g, src->colors[i].b); | |
| 460 } | |
| 461 return(map); | |
| 462 } | |
| 463 /* Map from Palette to BitField */ | |
| 1557 | 464 static Uint8 *Map1toN(SDL_PixelFormat *src, SDL_PixelFormat *dst) |
| 0 | 465 { |
| 466 Uint8 *map; | |
| 467 int i; | |
| 468 int bpp; | |
| 50 | 469 unsigned alpha; |
| 1557 | 470 SDL_Palette *pal = src->palette; |
| 0 | 471 |
| 472 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); | |
| 1557 | 473 map = (Uint8 *)SDL_malloc(pal->ncolors*bpp); |
| 0 | 474 if ( map == NULL ) { |
| 475 SDL_OutOfMemory(); | |
| 476 return(NULL); | |
| 477 } | |
| 478 | |
| 1557 | 479 alpha = dst->Amask ? src->alpha : 0; |
| 0 | 480 /* We memory copy to the pixel map so the endianness is preserved */ |
| 1557 | 481 for ( i=0; i<pal->ncolors; ++i ) { |
| 0 | 482 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, |
| 1557 | 483 pal->colors[i].r, pal->colors[i].g, |
| 484 pal->colors[i].b, alpha); | |
| 0 | 485 } |
| 486 return(map); | |
| 487 } | |
| 488 /* Map from BitField to Dithered-Palette to Palette */ | |
| 1557 | 489 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical) |
| 0 | 490 { |
| 491 /* Generate a 256 color dither palette */ | |
| 492 SDL_Palette dithered; | |
| 493 SDL_Color colors[256]; | |
| 1557 | 494 SDL_Palette *pal = dst->palette; |
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495 |
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496 /* SDL_DitherColors does not initialize the 'unused' component of colors, |
| 1557 | 497 but Map1to1 compares it against pal, so we should initialize it. */ |
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498 SDL_memset(colors, 0, sizeof(colors)); |
| 0 | 499 |
| 500 dithered.ncolors = 256; | |
| 501 SDL_DitherColors(colors, 8); | |
| 502 dithered.colors = colors; | |
| 1557 | 503 return(Map1to1(&dithered, pal, identical)); |
| 0 | 504 } |
| 505 | |
| 506 SDL_BlitMap *SDL_AllocBlitMap(void) | |
| 507 { | |
| 508 SDL_BlitMap *map; | |
| 509 | |
| 510 /* Allocate the empty map */ | |
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511 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map)); |
| 0 | 512 if ( map == NULL ) { |
| 513 SDL_OutOfMemory(); | |
| 514 return(NULL); | |
| 515 } | |
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516 SDL_memset(map, 0, sizeof(*map)); |
| 0 | 517 |
| 518 /* Allocate the software blit data */ | |
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519 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data)); |
| 0 | 520 if ( map->sw_data == NULL ) { |
| 521 SDL_FreeBlitMap(map); | |
| 522 SDL_OutOfMemory(); | |
| 523 return(NULL); | |
| 524 } | |
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525 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); |
| 0 | 526 |
| 527 /* It's ready to go */ | |
| 528 return(map); | |
| 529 } | |
| 530 void SDL_InvalidateMap(SDL_BlitMap *map) | |
| 531 { | |
| 532 if ( ! map ) { | |
| 533 return; | |
| 534 } | |
| 535 map->dst = NULL; | |
| 536 map->format_version = (unsigned int)-1; | |
| 537 if ( map->table ) { | |
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538 SDL_free(map->table); |
| 0 | 539 map->table = NULL; |
| 540 } | |
| 541 } | |
| 542 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) | |
| 543 { | |
| 544 SDL_PixelFormat *srcfmt; | |
| 545 SDL_PixelFormat *dstfmt; | |
| 546 SDL_BlitMap *map; | |
| 547 | |
| 548 /* Clear out any previous mapping */ | |
| 549 map = src->map; | |
| 550 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 551 SDL_UnRLESurface(src, 1); | |
| 552 } | |
| 553 SDL_InvalidateMap(map); | |
| 554 | |
| 555 /* Figure out what kind of mapping we're doing */ | |
| 556 map->identity = 0; | |
| 557 srcfmt = src->format; | |
| 558 dstfmt = dst->format; | |
| 559 switch (srcfmt->BytesPerPixel) { | |
| 560 case 1: | |
| 561 switch (dstfmt->BytesPerPixel) { | |
| 562 case 1: | |
| 563 /* Palette --> Palette */ | |
| 564 /* If both SDL_HWSURFACE, assume have same palette */ | |
| 565 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 566 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 567 map->identity = 1; | |
| 568 } else { | |
| 569 map->table = Map1to1(srcfmt->palette, | |
| 570 dstfmt->palette, &map->identity); | |
| 571 } | |
| 572 if ( ! map->identity ) { | |
| 573 if ( map->table == NULL ) { | |
| 574 return(-1); | |
| 575 } | |
| 576 } | |
| 577 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) | |
| 578 map->identity = 0; | |
| 579 break; | |
| 580 | |
| 581 default: | |
| 582 /* Palette --> BitField */ | |
| 1557 | 583 map->table = Map1toN(srcfmt, dstfmt); |
| 0 | 584 if ( map->table == NULL ) { |
| 585 return(-1); | |
| 586 } | |
| 587 break; | |
| 588 } | |
| 589 break; | |
| 590 default: | |
| 591 switch (dstfmt->BytesPerPixel) { | |
| 592 case 1: | |
| 593 /* BitField --> Palette */ | |
| 1557 | 594 map->table = MapNto1(srcfmt, dstfmt, &map->identity); |
| 0 | 595 if ( ! map->identity ) { |
| 596 if ( map->table == NULL ) { | |
| 597 return(-1); | |
| 598 } | |
| 599 } | |
| 600 map->identity = 0; /* Don't optimize to copy */ | |
| 601 break; | |
| 602 default: | |
| 603 /* BitField --> BitField */ | |
| 604 if ( FORMAT_EQUAL(srcfmt, dstfmt) ) | |
| 605 map->identity = 1; | |
| 606 break; | |
| 607 } | |
| 608 break; | |
| 609 } | |
| 610 | |
| 611 map->dst = dst; | |
| 612 map->format_version = dst->format_version; | |
| 613 | |
| 614 /* Choose your blitters wisely */ | |
| 615 return(SDL_CalculateBlit(src)); | |
| 616 } | |
| 617 void SDL_FreeBlitMap(SDL_BlitMap *map) | |
| 618 { | |
| 619 if ( map ) { | |
| 620 SDL_InvalidateMap(map); | |
| 621 if ( map->sw_data != NULL ) { | |
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622 SDL_free(map->sw_data); |
| 0 | 623 } |
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624 SDL_free(map); |
| 0 | 625 } |
| 626 } |