Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 4066:58a5055da431 SDL-1.2
More improvements for bug #373
Show the SDL cursor in the window and the arrow cursor outside the window.
This is also supposed to show the SDL cursor when activated, but that code
isn't working yet...
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 14 Jul 2007 08:27:06 +0000 |
| parents | cd5b5c52a37e |
| children | a1b03ba2fcd0 |
| 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 */ | |
|
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340 Uint32 SDL_MapRGB |
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341 (const SDL_PixelFormat * const format, |
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342 const Uint8 r, const Uint8 g, const Uint8 b) |
| 0 | 343 { |
| 344 if ( format->palette == NULL ) { | |
| 345 return (r >> format->Rloss) << format->Rshift | |
| 346 | (g >> format->Gloss) << format->Gshift | |
| 347 | (b >> format->Bloss) << format->Bshift | |
| 348 | format->Amask; | |
| 349 } else { | |
| 350 return SDL_FindColor(format->palette, r, g, b); | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 /* Find the pixel value corresponding to an RGBA quadruple */ | |
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355 Uint32 SDL_MapRGBA |
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356 (const SDL_PixelFormat * const format, |
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357 const Uint8 r, const Uint8 g, const Uint8 b, const Uint8 a) |
| 0 | 358 { |
| 359 if ( format->palette == NULL ) { | |
| 360 return (r >> format->Rloss) << format->Rshift | |
| 361 | (g >> format->Gloss) << format->Gshift | |
| 362 | (b >> format->Bloss) << format->Bshift | |
| 363 | ((a >> format->Aloss) << format->Ashift & format->Amask); | |
| 364 } else { | |
| 365 return SDL_FindColor(format->palette, r, g, b); | |
| 366 } | |
| 367 } | |
| 368 | |
| 369 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt, | |
| 370 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) | |
| 371 { | |
| 372 if ( fmt->palette == NULL ) { | |
| 373 /* | |
| 374 * This makes sure that the result is mapped to the | |
| 375 * interval [0..255], and the maximum value for each | |
| 376 * component is 255. This is important to make sure | |
| 377 * that white is indeed reported as (255, 255, 255), | |
| 378 * and that opaque alpha is 255. | |
| 379 * This only works for RGB bit fields at least 4 bit | |
| 380 * wide, which is almost always the case. | |
| 381 */ | |
|
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382 unsigned v; |
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383 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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384 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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385 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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386 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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387 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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388 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 389 if(fmt->Amask) { |
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390 v = (pixel & fmt->Amask) >> fmt->Ashift; |
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391 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); |
| 695 | 392 } else { |
| 0 | 393 *a = SDL_ALPHA_OPAQUE; |
| 695 | 394 } |
| 0 | 395 } else { |
| 396 *r = fmt->palette->colors[pixel].r; | |
| 397 *g = fmt->palette->colors[pixel].g; | |
| 398 *b = fmt->palette->colors[pixel].b; | |
| 399 *a = SDL_ALPHA_OPAQUE; | |
| 400 } | |
| 401 } | |
| 402 | |
| 403 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b) | |
| 404 { | |
| 405 if ( fmt->palette == NULL ) { | |
| 406 /* the note for SDL_GetRGBA above applies here too */ | |
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407 unsigned v; |
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408 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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409 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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410 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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411 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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412 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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413 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 414 } else { |
| 415 *r = fmt->palette->colors[pixel].r; | |
| 416 *g = fmt->palette->colors[pixel].g; | |
| 417 *b = fmt->palette->colors[pixel].b; | |
| 418 } | |
| 419 } | |
| 420 | |
| 421 /* Apply gamma to a set of colors - this is easy. :) */ | |
| 422 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, | |
| 423 int ncolors) | |
| 424 { | |
| 425 int i; | |
| 426 | |
| 427 for ( i=0; i<ncolors; ++i ) { | |
| 428 output[i].r = gamma[0*256 + colors[i].r] >> 8; | |
| 429 output[i].g = gamma[1*256 + colors[i].g] >> 8; | |
| 430 output[i].b = gamma[2*256 + colors[i].b] >> 8; | |
| 431 } | |
| 432 } | |
| 433 | |
| 434 /* Map from Palette to Palette */ | |
| 435 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) | |
| 436 { | |
| 437 Uint8 *map; | |
| 438 int i; | |
| 439 | |
| 440 if ( identical ) { | |
| 441 if ( src->ncolors <= dst->ncolors ) { | |
| 442 /* If an identical palette, no need to map */ | |
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443 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors* |
| 0 | 444 sizeof(SDL_Color)) == 0 ) { |
| 445 *identical = 1; | |
| 446 return(NULL); | |
| 447 } | |
| 448 } | |
| 449 *identical = 0; | |
| 450 } | |
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451 map = (Uint8 *)SDL_malloc(src->ncolors); |
| 0 | 452 if ( map == NULL ) { |
| 453 SDL_OutOfMemory(); | |
| 454 return(NULL); | |
| 455 } | |
| 456 for ( i=0; i<src->ncolors; ++i ) { | |
| 457 map[i] = SDL_FindColor(dst, | |
| 458 src->colors[i].r, src->colors[i].g, src->colors[i].b); | |
| 459 } | |
| 460 return(map); | |
| 461 } | |
| 462 /* Map from Palette to BitField */ | |
| 1557 | 463 static Uint8 *Map1toN(SDL_PixelFormat *src, SDL_PixelFormat *dst) |
| 0 | 464 { |
| 465 Uint8 *map; | |
| 466 int i; | |
| 467 int bpp; | |
| 50 | 468 unsigned alpha; |
| 1557 | 469 SDL_Palette *pal = src->palette; |
| 0 | 470 |
| 471 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); | |
| 1557 | 472 map = (Uint8 *)SDL_malloc(pal->ncolors*bpp); |
| 0 | 473 if ( map == NULL ) { |
| 474 SDL_OutOfMemory(); | |
| 475 return(NULL); | |
| 476 } | |
| 477 | |
| 1557 | 478 alpha = dst->Amask ? src->alpha : 0; |
| 0 | 479 /* We memory copy to the pixel map so the endianness is preserved */ |
| 1557 | 480 for ( i=0; i<pal->ncolors; ++i ) { |
| 0 | 481 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, |
| 1557 | 482 pal->colors[i].r, pal->colors[i].g, |
| 483 pal->colors[i].b, alpha); | |
| 0 | 484 } |
| 485 return(map); | |
| 486 } | |
| 487 /* Map from BitField to Dithered-Palette to Palette */ | |
| 1557 | 488 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical) |
| 0 | 489 { |
| 490 /* Generate a 256 color dither palette */ | |
| 491 SDL_Palette dithered; | |
| 492 SDL_Color colors[256]; | |
| 1557 | 493 SDL_Palette *pal = dst->palette; |
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494 |
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495 /* SDL_DitherColors does not initialize the 'unused' component of colors, |
| 1557 | 496 but Map1to1 compares it against pal, so we should initialize it. */ |
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497 SDL_memset(colors, 0, sizeof(colors)); |
| 0 | 498 |
| 499 dithered.ncolors = 256; | |
| 500 SDL_DitherColors(colors, 8); | |
| 501 dithered.colors = colors; | |
| 1557 | 502 return(Map1to1(&dithered, pal, identical)); |
| 0 | 503 } |
| 504 | |
| 505 SDL_BlitMap *SDL_AllocBlitMap(void) | |
| 506 { | |
| 507 SDL_BlitMap *map; | |
| 508 | |
| 509 /* Allocate the empty map */ | |
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510 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map)); |
| 0 | 511 if ( map == NULL ) { |
| 512 SDL_OutOfMemory(); | |
| 513 return(NULL); | |
| 514 } | |
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515 SDL_memset(map, 0, sizeof(*map)); |
| 0 | 516 |
| 517 /* Allocate the software blit data */ | |
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518 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data)); |
| 0 | 519 if ( map->sw_data == NULL ) { |
| 520 SDL_FreeBlitMap(map); | |
| 521 SDL_OutOfMemory(); | |
| 522 return(NULL); | |
| 523 } | |
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524 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); |
| 0 | 525 |
| 526 /* It's ready to go */ | |
| 527 return(map); | |
| 528 } | |
| 529 void SDL_InvalidateMap(SDL_BlitMap *map) | |
| 530 { | |
| 531 if ( ! map ) { | |
| 532 return; | |
| 533 } | |
| 534 map->dst = NULL; | |
| 535 map->format_version = (unsigned int)-1; | |
| 536 if ( map->table ) { | |
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537 SDL_free(map->table); |
| 0 | 538 map->table = NULL; |
| 539 } | |
| 540 } | |
| 541 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) | |
| 542 { | |
| 543 SDL_PixelFormat *srcfmt; | |
| 544 SDL_PixelFormat *dstfmt; | |
| 545 SDL_BlitMap *map; | |
| 546 | |
| 547 /* Clear out any previous mapping */ | |
| 548 map = src->map; | |
| 549 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 550 SDL_UnRLESurface(src, 1); | |
| 551 } | |
| 552 SDL_InvalidateMap(map); | |
| 553 | |
| 554 /* Figure out what kind of mapping we're doing */ | |
| 555 map->identity = 0; | |
| 556 srcfmt = src->format; | |
| 557 dstfmt = dst->format; | |
| 558 switch (srcfmt->BytesPerPixel) { | |
| 559 case 1: | |
| 560 switch (dstfmt->BytesPerPixel) { | |
| 561 case 1: | |
| 562 /* Palette --> Palette */ | |
| 563 /* If both SDL_HWSURFACE, assume have same palette */ | |
| 564 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 565 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 566 map->identity = 1; | |
| 567 } else { | |
| 568 map->table = Map1to1(srcfmt->palette, | |
| 569 dstfmt->palette, &map->identity); | |
| 570 } | |
| 571 if ( ! map->identity ) { | |
| 572 if ( map->table == NULL ) { | |
| 573 return(-1); | |
| 574 } | |
| 575 } | |
| 576 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) | |
| 577 map->identity = 0; | |
| 578 break; | |
| 579 | |
| 580 default: | |
| 581 /* Palette --> BitField */ | |
| 1557 | 582 map->table = Map1toN(srcfmt, dstfmt); |
| 0 | 583 if ( map->table == NULL ) { |
| 584 return(-1); | |
| 585 } | |
| 586 break; | |
| 587 } | |
| 588 break; | |
| 589 default: | |
| 590 switch (dstfmt->BytesPerPixel) { | |
| 591 case 1: | |
| 592 /* BitField --> Palette */ | |
| 1557 | 593 map->table = MapNto1(srcfmt, dstfmt, &map->identity); |
| 0 | 594 if ( ! map->identity ) { |
| 595 if ( map->table == NULL ) { | |
| 596 return(-1); | |
| 597 } | |
| 598 } | |
| 599 map->identity = 0; /* Don't optimize to copy */ | |
| 600 break; | |
| 601 default: | |
| 602 /* BitField --> BitField */ | |
| 603 if ( FORMAT_EQUAL(srcfmt, dstfmt) ) | |
| 604 map->identity = 1; | |
| 605 break; | |
| 606 } | |
| 607 break; | |
| 608 } | |
| 609 | |
| 610 map->dst = dst; | |
| 611 map->format_version = dst->format_version; | |
| 612 | |
| 613 /* Choose your blitters wisely */ | |
| 614 return(SDL_CalculateBlit(src)); | |
| 615 } | |
| 616 void SDL_FreeBlitMap(SDL_BlitMap *map) | |
| 617 { | |
| 618 if ( map ) { | |
| 619 SDL_InvalidateMap(map); | |
| 620 if ( map->sw_data != NULL ) { | |
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621 SDL_free(map->sw_data); |
| 0 | 622 } |
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623 SDL_free(map); |
| 0 | 624 } |
| 625 } |