Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 1643:51038e80ae59
More general fix for bug #189
The clipping is done at a higher level, and the low level functions are
passed clipped rectangles. Drivers which don't support source clipping
have not been changed, so the image will be squished instead of clipped,
but at least they will no longer crash when the destination rect was out
of bounds.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 17 Apr 2006 06:47:23 +0000 |
| parents | 61c237f69076 |
| children | 782fd950bd46 c121d94672cb cd5b5c52a37e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 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 */ | |
| 340 Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b) | |
| 341 { | |
| 342 if ( format->palette == NULL ) { | |
| 343 return (r >> format->Rloss) << format->Rshift | |
| 344 | (g >> format->Gloss) << format->Gshift | |
| 345 | (b >> format->Bloss) << format->Bshift | |
| 346 | format->Amask; | |
| 347 } else { | |
| 348 return SDL_FindColor(format->palette, r, g, b); | |
| 349 } | |
| 350 } | |
| 351 | |
| 352 /* Find the pixel value corresponding to an RGBA quadruple */ | |
| 353 Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a) | |
| 354 { | |
| 355 if ( format->palette == NULL ) { | |
| 356 return (r >> format->Rloss) << format->Rshift | |
| 357 | (g >> format->Gloss) << format->Gshift | |
| 358 | (b >> format->Bloss) << format->Bshift | |
| 359 | ((a >> format->Aloss) << format->Ashift & format->Amask); | |
| 360 } else { | |
| 361 return SDL_FindColor(format->palette, r, g, b); | |
| 362 } | |
| 363 } | |
| 364 | |
| 365 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt, | |
| 366 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) | |
| 367 { | |
| 368 if ( fmt->palette == NULL ) { | |
| 369 /* | |
| 370 * This makes sure that the result is mapped to the | |
| 371 * interval [0..255], and the maximum value for each | |
| 372 * component is 255. This is important to make sure | |
| 373 * that white is indeed reported as (255, 255, 255), | |
| 374 * and that opaque alpha is 255. | |
| 375 * This only works for RGB bit fields at least 4 bit | |
| 376 * wide, which is almost always the case. | |
| 377 */ | |
|
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378 unsigned v; |
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379 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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380 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
|
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381 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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382 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
|
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383 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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384 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 385 if(fmt->Amask) { |
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386 v = (pixel & fmt->Amask) >> fmt->Ashift; |
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387 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); |
| 695 | 388 } else { |
| 0 | 389 *a = SDL_ALPHA_OPAQUE; |
| 695 | 390 } |
| 0 | 391 } else { |
| 392 *r = fmt->palette->colors[pixel].r; | |
| 393 *g = fmt->palette->colors[pixel].g; | |
| 394 *b = fmt->palette->colors[pixel].b; | |
| 395 *a = SDL_ALPHA_OPAQUE; | |
| 396 } | |
| 397 } | |
| 398 | |
| 399 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b) | |
| 400 { | |
| 401 if ( fmt->palette == NULL ) { | |
| 402 /* the note for SDL_GetRGBA above applies here too */ | |
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403 unsigned v; |
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404 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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405 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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406 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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407 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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408 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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409 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 410 } else { |
| 411 *r = fmt->palette->colors[pixel].r; | |
| 412 *g = fmt->palette->colors[pixel].g; | |
| 413 *b = fmt->palette->colors[pixel].b; | |
| 414 } | |
| 415 } | |
| 416 | |
| 417 /* Apply gamma to a set of colors - this is easy. :) */ | |
| 418 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, | |
| 419 int ncolors) | |
| 420 { | |
| 421 int i; | |
| 422 | |
| 423 for ( i=0; i<ncolors; ++i ) { | |
| 424 output[i].r = gamma[0*256 + colors[i].r] >> 8; | |
| 425 output[i].g = gamma[1*256 + colors[i].g] >> 8; | |
| 426 output[i].b = gamma[2*256 + colors[i].b] >> 8; | |
| 427 } | |
| 428 } | |
| 429 | |
| 430 /* Map from Palette to Palette */ | |
| 431 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) | |
| 432 { | |
| 433 Uint8 *map; | |
| 434 int i; | |
| 435 | |
| 436 if ( identical ) { | |
| 437 if ( src->ncolors <= dst->ncolors ) { | |
| 438 /* If an identical palette, no need to map */ | |
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439 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors* |
| 0 | 440 sizeof(SDL_Color)) == 0 ) { |
| 441 *identical = 1; | |
| 442 return(NULL); | |
| 443 } | |
| 444 } | |
| 445 *identical = 0; | |
| 446 } | |
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447 map = (Uint8 *)SDL_malloc(src->ncolors); |
| 0 | 448 if ( map == NULL ) { |
| 449 SDL_OutOfMemory(); | |
| 450 return(NULL); | |
| 451 } | |
| 452 for ( i=0; i<src->ncolors; ++i ) { | |
| 453 map[i] = SDL_FindColor(dst, | |
| 454 src->colors[i].r, src->colors[i].g, src->colors[i].b); | |
| 455 } | |
| 456 return(map); | |
| 457 } | |
| 458 /* Map from Palette to BitField */ | |
| 1557 | 459 static Uint8 *Map1toN(SDL_PixelFormat *src, SDL_PixelFormat *dst) |
| 0 | 460 { |
| 461 Uint8 *map; | |
| 462 int i; | |
| 463 int bpp; | |
| 50 | 464 unsigned alpha; |
| 1557 | 465 SDL_Palette *pal = src->palette; |
| 0 | 466 |
| 467 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); | |
| 1557 | 468 map = (Uint8 *)SDL_malloc(pal->ncolors*bpp); |
| 0 | 469 if ( map == NULL ) { |
| 470 SDL_OutOfMemory(); | |
| 471 return(NULL); | |
| 472 } | |
| 473 | |
| 1557 | 474 alpha = dst->Amask ? src->alpha : 0; |
| 0 | 475 /* We memory copy to the pixel map so the endianness is preserved */ |
| 1557 | 476 for ( i=0; i<pal->ncolors; ++i ) { |
| 0 | 477 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, |
| 1557 | 478 pal->colors[i].r, pal->colors[i].g, |
| 479 pal->colors[i].b, alpha); | |
| 0 | 480 } |
| 481 return(map); | |
| 482 } | |
| 483 /* Map from BitField to Dithered-Palette to Palette */ | |
| 1557 | 484 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical) |
| 0 | 485 { |
| 486 /* Generate a 256 color dither palette */ | |
| 487 SDL_Palette dithered; | |
| 488 SDL_Color colors[256]; | |
| 1557 | 489 SDL_Palette *pal = dst->palette; |
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490 |
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491 /* SDL_DitherColors does not initialize the 'unused' component of colors, |
| 1557 | 492 but Map1to1 compares it against pal, so we should initialize it. */ |
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493 SDL_memset(colors, 0, sizeof(colors)); |
| 0 | 494 |
| 495 dithered.ncolors = 256; | |
| 496 SDL_DitherColors(colors, 8); | |
| 497 dithered.colors = colors; | |
| 1557 | 498 return(Map1to1(&dithered, pal, identical)); |
| 0 | 499 } |
| 500 | |
| 501 SDL_BlitMap *SDL_AllocBlitMap(void) | |
| 502 { | |
| 503 SDL_BlitMap *map; | |
| 504 | |
| 505 /* Allocate the empty map */ | |
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506 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map)); |
| 0 | 507 if ( map == NULL ) { |
| 508 SDL_OutOfMemory(); | |
| 509 return(NULL); | |
| 510 } | |
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511 SDL_memset(map, 0, sizeof(*map)); |
| 0 | 512 |
| 513 /* Allocate the software blit data */ | |
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514 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data)); |
| 0 | 515 if ( map->sw_data == NULL ) { |
| 516 SDL_FreeBlitMap(map); | |
| 517 SDL_OutOfMemory(); | |
| 518 return(NULL); | |
| 519 } | |
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520 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); |
| 0 | 521 |
| 522 /* It's ready to go */ | |
| 523 return(map); | |
| 524 } | |
| 525 void SDL_InvalidateMap(SDL_BlitMap *map) | |
| 526 { | |
| 527 if ( ! map ) { | |
| 528 return; | |
| 529 } | |
| 530 map->dst = NULL; | |
| 531 map->format_version = (unsigned int)-1; | |
| 532 if ( map->table ) { | |
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533 SDL_free(map->table); |
| 0 | 534 map->table = NULL; |
| 535 } | |
| 536 } | |
| 537 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) | |
| 538 { | |
| 539 SDL_PixelFormat *srcfmt; | |
| 540 SDL_PixelFormat *dstfmt; | |
| 541 SDL_BlitMap *map; | |
| 542 | |
| 543 /* Clear out any previous mapping */ | |
| 544 map = src->map; | |
| 545 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 546 SDL_UnRLESurface(src, 1); | |
| 547 } | |
| 548 SDL_InvalidateMap(map); | |
| 549 | |
| 550 /* Figure out what kind of mapping we're doing */ | |
| 551 map->identity = 0; | |
| 552 srcfmt = src->format; | |
| 553 dstfmt = dst->format; | |
| 554 switch (srcfmt->BytesPerPixel) { | |
| 555 case 1: | |
| 556 switch (dstfmt->BytesPerPixel) { | |
| 557 case 1: | |
| 558 /* Palette --> Palette */ | |
| 559 /* If both SDL_HWSURFACE, assume have same palette */ | |
| 560 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 561 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 562 map->identity = 1; | |
| 563 } else { | |
| 564 map->table = Map1to1(srcfmt->palette, | |
| 565 dstfmt->palette, &map->identity); | |
| 566 } | |
| 567 if ( ! map->identity ) { | |
| 568 if ( map->table == NULL ) { | |
| 569 return(-1); | |
| 570 } | |
| 571 } | |
| 572 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) | |
| 573 map->identity = 0; | |
| 574 break; | |
| 575 | |
| 576 default: | |
| 577 /* Palette --> BitField */ | |
| 1557 | 578 map->table = Map1toN(srcfmt, dstfmt); |
| 0 | 579 if ( map->table == NULL ) { |
| 580 return(-1); | |
| 581 } | |
| 582 break; | |
| 583 } | |
| 584 break; | |
| 585 default: | |
| 586 switch (dstfmt->BytesPerPixel) { | |
| 587 case 1: | |
| 588 /* BitField --> Palette */ | |
| 1557 | 589 map->table = MapNto1(srcfmt, dstfmt, &map->identity); |
| 0 | 590 if ( ! map->identity ) { |
| 591 if ( map->table == NULL ) { | |
| 592 return(-1); | |
| 593 } | |
| 594 } | |
| 595 map->identity = 0; /* Don't optimize to copy */ | |
| 596 break; | |
| 597 default: | |
| 598 /* BitField --> BitField */ | |
| 599 if ( FORMAT_EQUAL(srcfmt, dstfmt) ) | |
| 600 map->identity = 1; | |
| 601 break; | |
| 602 } | |
| 603 break; | |
| 604 } | |
| 605 | |
| 606 map->dst = dst; | |
| 607 map->format_version = dst->format_version; | |
| 608 | |
| 609 /* Choose your blitters wisely */ | |
| 610 return(SDL_CalculateBlit(src)); | |
| 611 } | |
| 612 void SDL_FreeBlitMap(SDL_BlitMap *map) | |
| 613 { | |
| 614 if ( map ) { | |
| 615 SDL_InvalidateMap(map); | |
| 616 if ( map->sw_data != NULL ) { | |
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617 SDL_free(map->sw_data); |
| 0 | 618 } |
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619 SDL_free(map); |
| 0 | 620 } |
| 621 } |