Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 1269:905d5b482f2a
Some explanation on why SDL_RWFromFP doesn't always work on Win32
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 26 Jan 2006 06:10:34 +0000 |
| parents | e9d23bb80140 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* General (mostly internal) pixel/color manipulation routines for SDL */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_endian.h" | |
| 36 #include "SDL_video.h" | |
| 37 #include "SDL_sysvideo.h" | |
| 38 #include "SDL_blit.h" | |
| 39 #include "SDL_pixels_c.h" | |
| 40 #include "SDL_RLEaccel_c.h" | |
| 41 | |
| 42 /* Helper functions */ | |
| 43 /* | |
| 44 * Allocate a pixel format structure and fill it according to the given info. | |
| 45 */ | |
| 46 SDL_PixelFormat *SDL_AllocFormat(int bpp, | |
| 47 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 48 { | |
| 49 SDL_PixelFormat *format; | |
| 50 Uint32 mask; | |
| 51 | |
| 52 /* Allocate an empty pixel format structure */ | |
| 53 format = malloc(sizeof(*format)); | |
| 54 if ( format == NULL ) { | |
| 55 SDL_OutOfMemory(); | |
| 56 return(NULL); | |
| 57 } | |
| 58 memset(format, 0, sizeof(*format)); | |
| 59 format->alpha = SDL_ALPHA_OPAQUE; | |
| 60 | |
| 61 /* Set up the format */ | |
| 62 format->BitsPerPixel = bpp; | |
| 63 format->BytesPerPixel = (bpp+7)/8; | |
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64 if ( Rmask || Bmask || Gmask ) { /* Packed pixels with custom mask */ |
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65 format->palette = NULL; |
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66 format->Rshift = 0; |
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67 format->Rloss = 8; |
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68 if ( Rmask ) { |
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69 for ( mask = Rmask; !(mask&0x01); mask >>= 1 ) |
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70 ++format->Rshift; |
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71 for ( ; (mask&0x01); mask >>= 1 ) |
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72 --format->Rloss; |
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73 } |
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74 format->Gshift = 0; |
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75 format->Gloss = 8; |
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76 if ( Gmask ) { |
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77 for ( mask = Gmask; !(mask&0x01); mask >>= 1 ) |
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78 ++format->Gshift; |
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79 for ( ; (mask&0x01); mask >>= 1 ) |
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80 --format->Gloss; |
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81 } |
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82 format->Bshift = 0; |
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83 format->Bloss = 8; |
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84 if ( Bmask ) { |
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85 for ( mask = Bmask; !(mask&0x01); mask >>= 1 ) |
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86 ++format->Bshift; |
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87 for ( ; (mask&0x01); mask >>= 1 ) |
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88 --format->Bloss; |
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89 } |
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90 format->Ashift = 0; |
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91 format->Aloss = 8; |
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92 if ( Amask ) { |
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93 for ( mask = Amask; !(mask&0x01); mask >>= 1 ) |
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94 ++format->Ashift; |
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95 for ( ; (mask&0x01); mask >>= 1 ) |
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96 --format->Aloss; |
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97 } |
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98 format->Rmask = Rmask; |
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99 format->Gmask = Gmask; |
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100 format->Bmask = Bmask; |
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101 format->Amask = Amask; |
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102 } else if ( bpp > 8 ) { /* Packed pixels with standard mask */ |
| 0 | 103 /* R-G-B */ |
| 104 if ( bpp > 24 ) | |
| 105 bpp = 24; | |
| 106 format->Rloss = 8-(bpp/3); | |
| 107 format->Gloss = 8-(bpp/3)-(bpp%3); | |
| 108 format->Bloss = 8-(bpp/3); | |
| 109 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3); | |
| 110 format->Gshift = (bpp/3); | |
| 111 format->Bshift = 0; | |
| 112 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift); | |
| 113 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift); | |
| 114 format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift); | |
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115 } else { |
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116 /* Palettized formats have no mask info */ |
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117 format->Rloss = 8; |
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118 format->Gloss = 8; |
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119 format->Bloss = 8; |
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120 format->Aloss = 8; |
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121 format->Rshift = 0; |
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122 format->Gshift = 0; |
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123 format->Bshift = 0; |
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124 format->Ashift = 0; |
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125 format->Rmask = 0; |
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126 format->Gmask = 0; |
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127 format->Bmask = 0; |
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128 format->Amask = 0; |
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129 } |
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130 if ( bpp <= 8 ) { /* Palettized mode */ |
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131 int ncolors = 1<<bpp; |
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132 #ifdef DEBUG_PALETTE |
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133 fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors); |
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134 #endif |
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135 format->palette = (SDL_Palette *)malloc(sizeof(SDL_Palette)); |
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136 if ( format->palette == NULL ) { |
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137 SDL_FreeFormat(format); |
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138 SDL_OutOfMemory(); |
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139 return(NULL); |
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140 } |
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141 (format->palette)->ncolors = ncolors; |
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142 (format->palette)->colors = (SDL_Color *)malloc( |
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143 (format->palette)->ncolors*sizeof(SDL_Color)); |
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144 if ( (format->palette)->colors == NULL ) { |
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145 SDL_FreeFormat(format); |
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146 SDL_OutOfMemory(); |
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147 return(NULL); |
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148 } |
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149 if ( Rmask || Bmask || Gmask ) { |
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150 /* create palette according to masks */ |
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151 int i; |
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152 int Rm=0,Gm=0,Bm=0; |
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153 int Rw=0,Gw=0,Bw=0; |
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154 #ifdef ENABLE_PALETTE_ALPHA |
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155 int Am=0,Aw=0; |
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156 #endif |
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157 if(Rmask) |
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158 { |
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159 Rw=8-format->Rloss; |
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160 for(i=format->Rloss;i>0;i-=Rw) |
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161 Rm|=1<<i; |
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162 } |
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163 #ifdef DEBUG_PALETTE |
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164 fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm); |
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165 #endif |
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166 if(Gmask) |
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167 { |
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168 Gw=8-format->Gloss; |
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169 for(i=format->Gloss;i>0;i-=Gw) |
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170 Gm|=1<<i; |
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171 } |
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172 #ifdef DEBUG_PALETTE |
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173 fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm); |
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174 #endif |
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175 if(Bmask) |
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176 { |
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177 Bw=8-format->Bloss; |
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178 for(i=format->Bloss;i>0;i-=Bw) |
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179 Bm|=1<<i; |
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180 } |
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181 #ifdef DEBUG_PALETTE |
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182 fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm); |
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183 #endif |
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184 #ifdef ENABLE_PALETTE_ALPHA |
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185 if(Amask) |
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186 { |
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187 Aw=8-format->Aloss; |
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188 for(i=format->Aloss;i>0;i-=Aw) |
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189 Am|=1<<i; |
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190 } |
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191 # ifdef DEBUG_PALETTE |
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192 fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am); |
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193 # endif |
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194 #endif |
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195 for(i=0; i < ncolors; ++i) { |
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196 int r,g,b; |
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197 r=(i&Rmask)>>format->Rshift; |
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198 r=(r<<format->Rloss)|((r*Rm)>>Rw); |
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199 format->palette->colors[i].r=r; |
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200 |
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201 g=(i&Gmask)>>format->Gshift; |
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202 g=(g<<format->Gloss)|((g*Gm)>>Gw); |
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203 format->palette->colors[i].g=g; |
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204 |
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205 b=(i&Bmask)>>format->Bshift; |
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206 b=(b<<format->Bloss)|((b*Bm)>>Bw); |
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207 format->palette->colors[i].b=b; |
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208 |
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209 #ifdef ENABLE_PALETTE_ALPHA |
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210 a=(i&Amask)>>format->Ashift; |
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211 a=(a<<format->Aloss)|((a*Am)>>Aw); |
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212 format->palette->colors[i].unused=a; |
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213 #else |
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214 format->palette->colors[i].unused=0; |
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215 #endif |
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216 } |
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217 } else if ( ncolors == 2 ) { |
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218 /* Create a black and white bitmap palette */ |
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219 format->palette->colors[0].r = 0xFF; |
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220 format->palette->colors[0].g = 0xFF; |
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221 format->palette->colors[0].b = 0xFF; |
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222 format->palette->colors[1].r = 0x00; |
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223 format->palette->colors[1].g = 0x00; |
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224 format->palette->colors[1].b = 0x00; |
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225 } else { |
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226 /* Create an empty palette */ |
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227 memset((format->palette)->colors, 0, |
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228 (format->palette)->ncolors*sizeof(SDL_Color)); |
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229 } |
| 0 | 230 } |
| 231 return(format); | |
| 232 } | |
| 233 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp, | |
| 234 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 235 { | |
| 236 if ( surface->format ) { | |
| 237 SDL_FreeFormat(surface->format); | |
| 238 SDL_FormatChanged(surface); | |
| 239 } | |
| 240 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask); | |
| 241 return surface->format; | |
| 242 } | |
| 243 | |
| 244 /* | |
| 245 * Change any previous mappings from/to the new surface format | |
| 246 */ | |
| 247 void SDL_FormatChanged(SDL_Surface *surface) | |
| 248 { | |
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249 static int format_version = 0; |
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250 ++format_version; |
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251 if ( format_version < 0 ) { /* It wrapped... */ |
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252 format_version = 1; |
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253 } |
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254 surface->format_version = format_version; |
| 0 | 255 SDL_InvalidateMap(surface->map); |
| 256 } | |
| 257 /* | |
| 258 * Free a previously allocated format structure | |
| 259 */ | |
| 260 void SDL_FreeFormat(SDL_PixelFormat *format) | |
| 261 { | |
| 262 if ( format ) { | |
| 263 if ( format->palette ) { | |
| 264 if ( format->palette->colors ) { | |
| 265 free(format->palette->colors); | |
| 266 } | |
| 267 free(format->palette); | |
| 268 } | |
| 269 free(format); | |
| 270 } | |
| 271 } | |
| 272 /* | |
| 273 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors | |
| 274 */ | |
| 275 void SDL_DitherColors(SDL_Color *colors, int bpp) | |
| 276 { | |
| 277 int i; | |
| 278 if(bpp != 8) | |
| 279 return; /* only 8bpp supported right now */ | |
| 280 | |
| 281 for(i = 0; i < 256; i++) { | |
| 282 int r, g, b; | |
| 283 /* map each bit field to the full [0, 255] interval, | |
| 284 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */ | |
| 285 r = i & 0xe0; | |
| 286 r |= r >> 3 | r >> 6; | |
| 287 colors[i].r = r; | |
| 288 g = (i << 3) & 0xe0; | |
| 289 g |= g >> 3 | g >> 6; | |
| 290 colors[i].g = g; | |
| 291 b = i & 0x3; | |
| 292 b |= b << 2; | |
| 293 b |= b << 4; | |
| 294 colors[i].b = b; | |
| 295 } | |
| 296 } | |
| 297 /* | |
| 298 * Calculate the pad-aligned scanline width of a surface | |
| 299 */ | |
| 300 Uint16 SDL_CalculatePitch(SDL_Surface *surface) | |
| 301 { | |
| 302 Uint16 pitch; | |
| 303 | |
| 304 /* Surface should be 4-byte aligned for speed */ | |
| 305 pitch = surface->w*surface->format->BytesPerPixel; | |
| 306 switch (surface->format->BitsPerPixel) { | |
| 307 case 1: | |
| 308 pitch = (pitch+7)/8; | |
| 309 break; | |
| 310 case 4: | |
| 311 pitch = (pitch+1)/2; | |
| 312 break; | |
| 313 default: | |
| 314 break; | |
| 315 } | |
| 316 pitch = (pitch + 3) & ~3; /* 4-byte aligning */ | |
| 317 return(pitch); | |
| 318 } | |
| 319 /* | |
| 320 * Match an RGB value to a particular palette index | |
| 321 */ | |
| 322 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b) | |
| 323 { | |
| 324 /* Do colorspace distance matching */ | |
| 325 unsigned int smallest; | |
| 326 unsigned int distance; | |
| 327 int rd, gd, bd; | |
| 328 int i; | |
| 329 Uint8 pixel=0; | |
| 330 | |
| 331 smallest = ~0; | |
| 332 for ( i=0; i<pal->ncolors; ++i ) { | |
| 333 rd = pal->colors[i].r - r; | |
| 334 gd = pal->colors[i].g - g; | |
| 335 bd = pal->colors[i].b - b; | |
| 336 distance = (rd*rd)+(gd*gd)+(bd*bd); | |
| 337 if ( distance < smallest ) { | |
| 338 pixel = i; | |
| 339 if ( distance == 0 ) { /* Perfect match! */ | |
| 340 break; | |
| 341 } | |
| 342 smallest = distance; | |
| 343 } | |
| 344 } | |
| 345 return(pixel); | |
| 346 } | |
| 347 | |
| 348 /* Find the opaque pixel value corresponding to an RGB triple */ | |
| 349 Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b) | |
| 350 { | |
| 351 if ( format->palette == NULL ) { | |
| 352 return (r >> format->Rloss) << format->Rshift | |
| 353 | (g >> format->Gloss) << format->Gshift | |
| 354 | (b >> format->Bloss) << format->Bshift | |
| 355 | format->Amask; | |
| 356 } else { | |
| 357 return SDL_FindColor(format->palette, r, g, b); | |
| 358 } | |
| 359 } | |
| 360 | |
| 361 /* Find the pixel value corresponding to an RGBA quadruple */ | |
| 362 Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a) | |
| 363 { | |
| 364 if ( format->palette == NULL ) { | |
| 365 return (r >> format->Rloss) << format->Rshift | |
| 366 | (g >> format->Gloss) << format->Gshift | |
| 367 | (b >> format->Bloss) << format->Bshift | |
| 368 | ((a >> format->Aloss) << format->Ashift & format->Amask); | |
| 369 } else { | |
| 370 return SDL_FindColor(format->palette, r, g, b); | |
| 371 } | |
| 372 } | |
| 373 | |
| 374 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt, | |
| 375 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) | |
| 376 { | |
| 377 if ( fmt->palette == NULL ) { | |
| 378 /* | |
| 379 * This makes sure that the result is mapped to the | |
| 380 * interval [0..255], and the maximum value for each | |
| 381 * component is 255. This is important to make sure | |
| 382 * that white is indeed reported as (255, 255, 255), | |
| 383 * and that opaque alpha is 255. | |
| 384 * This only works for RGB bit fields at least 4 bit | |
| 385 * wide, which is almost always the case. | |
| 386 */ | |
|
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387 unsigned v; |
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388 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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389 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
|
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390 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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391 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
|
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392 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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393 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 394 if(fmt->Amask) { |
|
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395 v = (pixel & fmt->Amask) >> fmt->Ashift; |
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396 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); |
| 695 | 397 } else { |
| 0 | 398 *a = SDL_ALPHA_OPAQUE; |
| 695 | 399 } |
| 0 | 400 } else { |
| 401 *r = fmt->palette->colors[pixel].r; | |
| 402 *g = fmt->palette->colors[pixel].g; | |
| 403 *b = fmt->palette->colors[pixel].b; | |
| 404 *a = SDL_ALPHA_OPAQUE; | |
| 405 } | |
| 406 } | |
| 407 | |
| 408 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b) | |
| 409 { | |
| 410 if ( fmt->palette == NULL ) { | |
| 411 /* the note for SDL_GetRGBA above applies here too */ | |
|
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412 unsigned v; |
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413 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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414 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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415 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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688
c0522010bb6d
Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents:
628
diff
changeset
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416 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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628
e561e8752d33
*** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
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417 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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688
c0522010bb6d
Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents:
628
diff
changeset
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418 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 419 } else { |
| 420 *r = fmt->palette->colors[pixel].r; | |
| 421 *g = fmt->palette->colors[pixel].g; | |
| 422 *b = fmt->palette->colors[pixel].b; | |
| 423 } | |
| 424 } | |
| 425 | |
| 426 /* Apply gamma to a set of colors - this is easy. :) */ | |
| 427 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, | |
| 428 int ncolors) | |
| 429 { | |
| 430 int i; | |
| 431 | |
| 432 for ( i=0; i<ncolors; ++i ) { | |
| 433 output[i].r = gamma[0*256 + colors[i].r] >> 8; | |
| 434 output[i].g = gamma[1*256 + colors[i].g] >> 8; | |
| 435 output[i].b = gamma[2*256 + colors[i].b] >> 8; | |
| 436 } | |
| 437 } | |
| 438 | |
| 439 /* Map from Palette to Palette */ | |
| 440 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) | |
| 441 { | |
| 442 Uint8 *map; | |
| 443 int i; | |
| 444 | |
| 445 if ( identical ) { | |
| 446 if ( src->ncolors <= dst->ncolors ) { | |
| 447 /* If an identical palette, no need to map */ | |
| 448 if ( memcmp(src->colors, dst->colors, src->ncolors* | |
| 449 sizeof(SDL_Color)) == 0 ) { | |
| 450 *identical = 1; | |
| 451 return(NULL); | |
| 452 } | |
| 453 } | |
| 454 *identical = 0; | |
| 455 } | |
| 456 map = (Uint8 *)malloc(src->ncolors); | |
| 457 if ( map == NULL ) { | |
| 458 SDL_OutOfMemory(); | |
| 459 return(NULL); | |
| 460 } | |
| 461 for ( i=0; i<src->ncolors; ++i ) { | |
| 462 map[i] = SDL_FindColor(dst, | |
| 463 src->colors[i].r, src->colors[i].g, src->colors[i].b); | |
| 464 } | |
| 465 return(map); | |
| 466 } | |
| 467 /* Map from Palette to BitField */ | |
| 468 static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst) | |
| 469 { | |
| 470 Uint8 *map; | |
| 471 int i; | |
| 472 int bpp; | |
| 50 | 473 unsigned alpha; |
| 0 | 474 |
| 475 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); | |
| 476 map = (Uint8 *)malloc(src->ncolors*bpp); | |
| 477 if ( map == NULL ) { | |
| 478 SDL_OutOfMemory(); | |
| 479 return(NULL); | |
| 480 } | |
| 481 | |
| 50 | 482 alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0; |
| 0 | 483 /* We memory copy to the pixel map so the endianness is preserved */ |
| 484 for ( i=0; i<src->ncolors; ++i ) { | |
| 485 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, | |
| 486 src->colors[i].r, src->colors[i].g, | |
| 50 | 487 src->colors[i].b, alpha); |
| 0 | 488 } |
| 489 return(map); | |
| 490 } | |
| 491 /* Map from BitField to Dithered-Palette to Palette */ | |
| 492 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical) | |
| 493 { | |
| 494 /* Generate a 256 color dither palette */ | |
| 495 SDL_Palette dithered; | |
| 496 SDL_Color colors[256]; | |
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3bf4103b2b89
Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
845
diff
changeset
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497 |
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3bf4103b2b89
Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
845
diff
changeset
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498 /* SDL_DitherColors does not initialize the 'unused' component of colors, |
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3bf4103b2b89
Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
845
diff
changeset
|
499 but Map1to1 compares it against dst, so we should initialize it. */ |
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3bf4103b2b89
Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
845
diff
changeset
|
500 memset(colors, 0, sizeof(colors)); |
| 0 | 501 |
| 502 dithered.ncolors = 256; | |
| 503 SDL_DitherColors(colors, 8); | |
| 504 dithered.colors = colors; | |
| 505 return(Map1to1(&dithered, dst, identical)); | |
| 506 } | |
| 507 | |
| 508 SDL_BlitMap *SDL_AllocBlitMap(void) | |
| 509 { | |
| 510 SDL_BlitMap *map; | |
| 511 | |
| 512 /* Allocate the empty map */ | |
| 513 map = (SDL_BlitMap *)malloc(sizeof(*map)); | |
| 514 if ( map == NULL ) { | |
| 515 SDL_OutOfMemory(); | |
| 516 return(NULL); | |
| 517 } | |
| 518 memset(map, 0, sizeof(*map)); | |
| 519 | |
| 520 /* Allocate the software blit data */ | |
| 521 map->sw_data = (struct private_swaccel *)malloc(sizeof(*map->sw_data)); | |
| 522 if ( map->sw_data == NULL ) { | |
| 523 SDL_FreeBlitMap(map); | |
| 524 SDL_OutOfMemory(); | |
| 525 return(NULL); | |
| 526 } | |
| 527 memset(map->sw_data, 0, sizeof(*map->sw_data)); | |
| 528 | |
| 529 /* It's ready to go */ | |
| 530 return(map); | |
| 531 } | |
| 532 void SDL_InvalidateMap(SDL_BlitMap *map) | |
| 533 { | |
| 534 if ( ! map ) { | |
| 535 return; | |
| 536 } | |
| 537 map->dst = NULL; | |
| 538 map->format_version = (unsigned int)-1; | |
| 539 if ( map->table ) { | |
| 540 free(map->table); | |
| 541 map->table = NULL; | |
| 542 } | |
| 543 } | |
| 544 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) | |
| 545 { | |
| 546 SDL_PixelFormat *srcfmt; | |
| 547 SDL_PixelFormat *dstfmt; | |
| 548 SDL_BlitMap *map; | |
| 549 | |
| 550 /* Clear out any previous mapping */ | |
| 551 map = src->map; | |
| 552 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 553 SDL_UnRLESurface(src, 1); | |
| 554 } | |
| 555 SDL_InvalidateMap(map); | |
| 556 | |
| 557 /* Figure out what kind of mapping we're doing */ | |
| 558 map->identity = 0; | |
| 559 srcfmt = src->format; | |
| 560 dstfmt = dst->format; | |
| 561 switch (srcfmt->BytesPerPixel) { | |
| 562 case 1: | |
| 563 switch (dstfmt->BytesPerPixel) { | |
| 564 case 1: | |
| 565 /* Palette --> Palette */ | |
| 566 /* If both SDL_HWSURFACE, assume have same palette */ | |
| 567 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 568 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 569 map->identity = 1; | |
| 570 } else { | |
| 571 map->table = Map1to1(srcfmt->palette, | |
| 572 dstfmt->palette, &map->identity); | |
| 573 } | |
| 574 if ( ! map->identity ) { | |
| 575 if ( map->table == NULL ) { | |
| 576 return(-1); | |
| 577 } | |
| 578 } | |
| 579 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) | |
| 580 map->identity = 0; | |
| 581 break; | |
| 582 | |
| 583 default: | |
| 584 /* Palette --> BitField */ | |
| 585 map->table = Map1toN(srcfmt->palette, dstfmt); | |
| 586 if ( map->table == NULL ) { | |
| 587 return(-1); | |
| 588 } | |
| 589 break; | |
| 590 } | |
| 591 break; | |
| 592 default: | |
| 593 switch (dstfmt->BytesPerPixel) { | |
| 594 case 1: | |
| 595 /* BitField --> Palette */ | |
| 596 map->table = MapNto1(srcfmt, | |
| 597 dstfmt->palette, &map->identity); | |
| 598 if ( ! map->identity ) { | |
| 599 if ( map->table == NULL ) { | |
| 600 return(-1); | |
| 601 } | |
| 602 } | |
| 603 map->identity = 0; /* Don't optimize to copy */ | |
| 604 break; | |
| 605 default: | |
| 606 /* BitField --> BitField */ | |
| 607 if ( FORMAT_EQUAL(srcfmt, dstfmt) ) | |
| 608 map->identity = 1; | |
| 609 break; | |
| 610 } | |
| 611 break; | |
| 612 } | |
| 613 | |
| 614 map->dst = dst; | |
| 615 map->format_version = dst->format_version; | |
| 616 | |
| 617 /* Choose your blitters wisely */ | |
| 618 return(SDL_CalculateBlit(src)); | |
| 619 } | |
| 620 void SDL_FreeBlitMap(SDL_BlitMap *map) | |
| 621 { | |
| 622 if ( map ) { | |
| 623 SDL_InvalidateMap(map); | |
| 624 if ( map->sw_data != NULL ) { | |
| 625 free(map->sw_data); | |
| 626 } | |
| 627 free(map); | |
| 628 } | |
| 629 } |