Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 1240:3b8a43c428bb
From Bug #36:
There are a couple of issues with the selection of Altivec alpha-blitting
routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c.
1) There's no check for the presence of Altivec when checking if the
Blit32to565PixelAlphaAltivec() routine can be selected.
2) Altivec cannot be used in video memory, and there's no check if the
destination surface is a hardware surface. (Alpha-blitting to a hardware
surface with GPU support is a bad idea, but somebody's bound to do it anyway.)
Patch to fix these attached.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 08 Jan 2006 21:18:15 +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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parents:
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86 ++format->Bshift; |
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87 for ( ; (mask&0x01); mask >>= 1 ) |
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parents:
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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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Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
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parents:
628
diff
changeset
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414 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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628
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415 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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416 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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parents:
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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:
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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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Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
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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
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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 } |