Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 4249:429c8dd3175d SDL-1.2
Fixed bug #713
Don't clamp the mouse coordinates to the video surface size, instead clamp them to the last known window size.
This allows users to get the correct mouse coordinates even if they don't call SDL_SetVideoMode() in response to an SDL_VIDEORESIZE event (used as a hack to retain the OpenGL context on Windows and Linux after a window resize)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 27 Sep 2009 05:18:43 +0000 |
| parents | 34068be6aa0b |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* General (mostly internal) pixel/color manipulation routines for SDL */ | |
| 25 | |
| 26 #include "SDL_endian.h" | |
| 27 #include "SDL_video.h" | |
| 28 #include "SDL_sysvideo.h" | |
| 29 #include "SDL_blit.h" | |
| 30 #include "SDL_pixels_c.h" | |
| 31 #include "SDL_RLEaccel_c.h" | |
| 32 | |
| 33 /* Helper functions */ | |
| 34 /* | |
| 35 * Allocate a pixel format structure and fill it according to the given info. | |
| 36 */ | |
| 37 SDL_PixelFormat *SDL_AllocFormat(int bpp, | |
| 38 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 39 { | |
| 40 SDL_PixelFormat *format; | |
| 41 Uint32 mask; | |
| 42 | |
| 43 /* Allocate an empty pixel format structure */ | |
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44 format = SDL_malloc(sizeof(*format)); |
| 0 | 45 if ( format == NULL ) { |
| 46 SDL_OutOfMemory(); | |
| 47 return(NULL); | |
| 48 } | |
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49 SDL_memset(format, 0, sizeof(*format)); |
| 0 | 50 format->alpha = SDL_ALPHA_OPAQUE; |
| 51 | |
| 52 /* Set up the format */ | |
| 53 format->BitsPerPixel = bpp; | |
| 54 format->BytesPerPixel = (bpp+7)/8; | |
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55 if ( Rmask || Bmask || Gmask ) { /* Packed pixels with custom mask */ |
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56 format->palette = NULL; |
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57 format->Rshift = 0; |
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58 format->Rloss = 8; |
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59 if ( Rmask ) { |
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60 for ( mask = Rmask; !(mask&0x01); mask >>= 1 ) |
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61 ++format->Rshift; |
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62 for ( ; (mask&0x01); mask >>= 1 ) |
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63 --format->Rloss; |
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64 } |
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65 format->Gshift = 0; |
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66 format->Gloss = 8; |
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67 if ( Gmask ) { |
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68 for ( mask = Gmask; !(mask&0x01); mask >>= 1 ) |
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69 ++format->Gshift; |
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70 for ( ; (mask&0x01); mask >>= 1 ) |
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71 --format->Gloss; |
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72 } |
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73 format->Bshift = 0; |
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74 format->Bloss = 8; |
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75 if ( Bmask ) { |
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76 for ( mask = Bmask; !(mask&0x01); mask >>= 1 ) |
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77 ++format->Bshift; |
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78 for ( ; (mask&0x01); mask >>= 1 ) |
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79 --format->Bloss; |
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80 } |
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81 format->Ashift = 0; |
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82 format->Aloss = 8; |
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83 if ( Amask ) { |
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84 for ( mask = Amask; !(mask&0x01); mask >>= 1 ) |
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85 ++format->Ashift; |
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86 for ( ; (mask&0x01); mask >>= 1 ) |
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87 --format->Aloss; |
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88 } |
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89 format->Rmask = Rmask; |
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90 format->Gmask = Gmask; |
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91 format->Bmask = Bmask; |
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92 format->Amask = Amask; |
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93 } else if ( bpp > 8 ) { /* Packed pixels with standard mask */ |
| 0 | 94 /* R-G-B */ |
| 95 if ( bpp > 24 ) | |
| 96 bpp = 24; | |
| 97 format->Rloss = 8-(bpp/3); | |
| 98 format->Gloss = 8-(bpp/3)-(bpp%3); | |
| 99 format->Bloss = 8-(bpp/3); | |
| 100 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3); | |
| 101 format->Gshift = (bpp/3); | |
| 102 format->Bshift = 0; | |
| 103 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift); | |
| 104 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift); | |
| 105 format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift); | |
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106 } else { |
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107 /* Palettized formats have no mask info */ |
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108 format->Rloss = 8; |
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109 format->Gloss = 8; |
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110 format->Bloss = 8; |
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111 format->Aloss = 8; |
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112 format->Rshift = 0; |
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113 format->Gshift = 0; |
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114 format->Bshift = 0; |
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115 format->Ashift = 0; |
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116 format->Rmask = 0; |
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117 format->Gmask = 0; |
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118 format->Bmask = 0; |
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119 format->Amask = 0; |
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120 } |
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121 if ( bpp <= 8 ) { /* Palettized mode */ |
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122 int ncolors = 1<<bpp; |
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123 #ifdef DEBUG_PALETTE |
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124 fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors); |
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125 #endif |
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126 format->palette = (SDL_Palette *)SDL_malloc(sizeof(SDL_Palette)); |
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127 if ( format->palette == NULL ) { |
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128 SDL_FreeFormat(format); |
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129 SDL_OutOfMemory(); |
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130 return(NULL); |
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131 } |
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132 (format->palette)->ncolors = ncolors; |
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133 (format->palette)->colors = (SDL_Color *)SDL_malloc( |
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134 (format->palette)->ncolors*sizeof(SDL_Color)); |
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135 if ( (format->palette)->colors == NULL ) { |
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136 SDL_FreeFormat(format); |
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137 SDL_OutOfMemory(); |
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138 return(NULL); |
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139 } |
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140 if ( Rmask || Bmask || Gmask ) { |
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141 /* create palette according to masks */ |
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142 int i; |
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143 int Rm=0,Gm=0,Bm=0; |
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144 int Rw=0,Gw=0,Bw=0; |
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145 #ifdef ENABLE_PALETTE_ALPHA |
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146 int Am=0,Aw=0; |
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147 #endif |
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148 if(Rmask) |
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149 { |
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150 Rw=8-format->Rloss; |
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151 for(i=format->Rloss;i>0;i-=Rw) |
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152 Rm|=1<<i; |
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153 } |
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154 #ifdef DEBUG_PALETTE |
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155 fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm); |
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156 #endif |
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157 if(Gmask) |
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158 { |
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159 Gw=8-format->Gloss; |
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160 for(i=format->Gloss;i>0;i-=Gw) |
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161 Gm|=1<<i; |
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162 } |
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163 #ifdef DEBUG_PALETTE |
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164 fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm); |
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165 #endif |
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166 if(Bmask) |
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167 { |
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168 Bw=8-format->Bloss; |
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169 for(i=format->Bloss;i>0;i-=Bw) |
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170 Bm|=1<<i; |
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171 } |
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172 #ifdef DEBUG_PALETTE |
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173 fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm); |
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174 #endif |
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175 #ifdef ENABLE_PALETTE_ALPHA |
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176 if(Amask) |
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177 { |
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178 Aw=8-format->Aloss; |
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179 for(i=format->Aloss;i>0;i-=Aw) |
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180 Am|=1<<i; |
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181 } |
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182 # ifdef DEBUG_PALETTE |
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183 fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am); |
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184 # endif |
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185 #endif |
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186 for(i=0; i < ncolors; ++i) { |
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187 int r,g,b; |
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188 r=(i&Rmask)>>format->Rshift; |
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189 r=(r<<format->Rloss)|((r*Rm)>>Rw); |
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190 format->palette->colors[i].r=r; |
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191 |
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192 g=(i&Gmask)>>format->Gshift; |
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193 g=(g<<format->Gloss)|((g*Gm)>>Gw); |
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194 format->palette->colors[i].g=g; |
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195 |
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196 b=(i&Bmask)>>format->Bshift; |
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197 b=(b<<format->Bloss)|((b*Bm)>>Bw); |
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198 format->palette->colors[i].b=b; |
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199 |
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200 #ifdef ENABLE_PALETTE_ALPHA |
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201 a=(i&Amask)>>format->Ashift; |
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202 a=(a<<format->Aloss)|((a*Am)>>Aw); |
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203 format->palette->colors[i].unused=a; |
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204 #else |
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205 format->palette->colors[i].unused=0; |
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206 #endif |
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207 } |
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208 } else if ( ncolors == 2 ) { |
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209 /* Create a black and white bitmap palette */ |
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210 format->palette->colors[0].r = 0xFF; |
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211 format->palette->colors[0].g = 0xFF; |
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212 format->palette->colors[0].b = 0xFF; |
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213 format->palette->colors[1].r = 0x00; |
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214 format->palette->colors[1].g = 0x00; |
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215 format->palette->colors[1].b = 0x00; |
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216 } else { |
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217 /* Create an empty palette */ |
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218 SDL_memset((format->palette)->colors, 0, |
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219 (format->palette)->ncolors*sizeof(SDL_Color)); |
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220 } |
| 0 | 221 } |
| 222 return(format); | |
| 223 } | |
| 224 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp, | |
| 225 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 226 { | |
| 227 if ( surface->format ) { | |
| 228 SDL_FreeFormat(surface->format); | |
| 229 SDL_FormatChanged(surface); | |
| 230 } | |
| 231 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask); | |
| 232 return surface->format; | |
| 233 } | |
| 234 | |
| 235 /* | |
| 236 * Change any previous mappings from/to the new surface format | |
| 237 */ | |
| 238 void SDL_FormatChanged(SDL_Surface *surface) | |
| 239 { | |
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240 static int format_version = 0; |
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241 ++format_version; |
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242 if ( format_version < 0 ) { /* It wrapped... */ |
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243 format_version = 1; |
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244 } |
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245 surface->format_version = format_version; |
| 0 | 246 SDL_InvalidateMap(surface->map); |
| 247 } | |
| 248 /* | |
| 249 * Free a previously allocated format structure | |
| 250 */ | |
| 251 void SDL_FreeFormat(SDL_PixelFormat *format) | |
| 252 { | |
| 253 if ( format ) { | |
| 254 if ( format->palette ) { | |
| 255 if ( format->palette->colors ) { | |
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256 SDL_free(format->palette->colors); |
| 0 | 257 } |
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258 SDL_free(format->palette); |
| 0 | 259 } |
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260 SDL_free(format); |
| 0 | 261 } |
| 262 } | |
| 263 /* | |
| 264 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors | |
| 265 */ | |
| 266 void SDL_DitherColors(SDL_Color *colors, int bpp) | |
| 267 { | |
| 268 int i; | |
| 269 if(bpp != 8) | |
| 270 return; /* only 8bpp supported right now */ | |
| 271 | |
| 272 for(i = 0; i < 256; i++) { | |
| 273 int r, g, b; | |
| 274 /* map each bit field to the full [0, 255] interval, | |
| 275 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */ | |
| 276 r = i & 0xe0; | |
| 277 r |= r >> 3 | r >> 6; | |
| 278 colors[i].r = r; | |
| 279 g = (i << 3) & 0xe0; | |
| 280 g |= g >> 3 | g >> 6; | |
| 281 colors[i].g = g; | |
| 282 b = i & 0x3; | |
| 283 b |= b << 2; | |
| 284 b |= b << 4; | |
| 285 colors[i].b = b; | |
| 286 } | |
| 287 } | |
| 288 /* | |
| 289 * Calculate the pad-aligned scanline width of a surface | |
| 290 */ | |
| 291 Uint16 SDL_CalculatePitch(SDL_Surface *surface) | |
| 292 { | |
| 293 Uint16 pitch; | |
| 294 | |
| 295 /* Surface should be 4-byte aligned for speed */ | |
| 296 pitch = surface->w*surface->format->BytesPerPixel; | |
| 297 switch (surface->format->BitsPerPixel) { | |
| 298 case 1: | |
| 299 pitch = (pitch+7)/8; | |
| 300 break; | |
| 301 case 4: | |
| 302 pitch = (pitch+1)/2; | |
| 303 break; | |
| 304 default: | |
| 305 break; | |
| 306 } | |
| 307 pitch = (pitch + 3) & ~3; /* 4-byte aligning */ | |
| 308 return(pitch); | |
| 309 } | |
| 310 /* | |
| 311 * Match an RGB value to a particular palette index | |
| 312 */ | |
| 313 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b) | |
| 314 { | |
| 315 /* Do colorspace distance matching */ | |
| 316 unsigned int smallest; | |
| 317 unsigned int distance; | |
| 318 int rd, gd, bd; | |
| 319 int i; | |
| 320 Uint8 pixel=0; | |
| 321 | |
| 322 smallest = ~0; | |
| 323 for ( i=0; i<pal->ncolors; ++i ) { | |
| 324 rd = pal->colors[i].r - r; | |
| 325 gd = pal->colors[i].g - g; | |
| 326 bd = pal->colors[i].b - b; | |
| 327 distance = (rd*rd)+(gd*gd)+(bd*bd); | |
| 328 if ( distance < smallest ) { | |
| 329 pixel = i; | |
| 330 if ( distance == 0 ) { /* Perfect match! */ | |
| 331 break; | |
| 332 } | |
| 333 smallest = distance; | |
| 334 } | |
| 335 } | |
| 336 return(pixel); | |
| 337 } | |
| 338 | |
| 339 /* Find the opaque pixel value corresponding to an RGB triple */ | |
|
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340 Uint32 SDL_MapRGB |
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341 (const SDL_PixelFormat * const format, |
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342 const Uint8 r, const Uint8 g, const Uint8 b) |
| 0 | 343 { |
| 344 if ( format->palette == NULL ) { | |
| 345 return (r >> format->Rloss) << format->Rshift | |
| 346 | (g >> format->Gloss) << format->Gshift | |
| 347 | (b >> format->Bloss) << format->Bshift | |
| 348 | format->Amask; | |
| 349 } else { | |
| 350 return SDL_FindColor(format->palette, r, g, b); | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 /* Find the pixel value corresponding to an RGBA quadruple */ | |
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355 Uint32 SDL_MapRGBA |
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356 (const SDL_PixelFormat * const format, |
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357 const Uint8 r, const Uint8 g, const Uint8 b, const Uint8 a) |
| 0 | 358 { |
| 359 if ( format->palette == NULL ) { | |
| 360 return (r >> format->Rloss) << format->Rshift | |
| 361 | (g >> format->Gloss) << format->Gshift | |
| 362 | (b >> format->Bloss) << format->Bshift | |
| 363 | ((a >> format->Aloss) << format->Ashift & format->Amask); | |
| 364 } else { | |
| 365 return SDL_FindColor(format->palette, r, g, b); | |
| 366 } | |
| 367 } | |
| 368 | |
| 4173 | 369 void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * const fmt, |
| 0 | 370 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) |
| 371 { | |
| 372 if ( fmt->palette == NULL ) { | |
| 373 /* | |
| 374 * This makes sure that the result is mapped to the | |
| 375 * interval [0..255], and the maximum value for each | |
| 376 * component is 255. This is important to make sure | |
| 377 * that white is indeed reported as (255, 255, 255), | |
| 378 * and that opaque alpha is 255. | |
| 379 * This only works for RGB bit fields at least 4 bit | |
| 380 * wide, which is almost always the case. | |
| 381 */ | |
|
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382 unsigned v; |
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383 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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384 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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385 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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386 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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387 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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388 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 389 if(fmt->Amask) { |
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390 v = (pixel & fmt->Amask) >> fmt->Ashift; |
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391 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); |
| 695 | 392 } else { |
| 0 | 393 *a = SDL_ALPHA_OPAQUE; |
| 695 | 394 } |
| 0 | 395 } else { |
| 396 *r = fmt->palette->colors[pixel].r; | |
| 397 *g = fmt->palette->colors[pixel].g; | |
| 398 *b = fmt->palette->colors[pixel].b; | |
| 399 *a = SDL_ALPHA_OPAQUE; | |
| 400 } | |
| 401 } | |
| 402 | |
| 4173 | 403 void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * const fmt, |
| 404 Uint8 *r,Uint8 *g,Uint8 *b) | |
| 0 | 405 { |
| 406 if ( fmt->palette == NULL ) { | |
| 407 /* the note for SDL_GetRGBA above applies here too */ | |
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408 unsigned v; |
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409 v = (pixel & fmt->Rmask) >> fmt->Rshift; |
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410 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
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411 v = (pixel & fmt->Gmask) >> fmt->Gshift; |
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412 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
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413 v = (pixel & fmt->Bmask) >> fmt->Bshift; |
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414 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| 0 | 415 } else { |
| 416 *r = fmt->palette->colors[pixel].r; | |
| 417 *g = fmt->palette->colors[pixel].g; | |
| 418 *b = fmt->palette->colors[pixel].b; | |
| 419 } | |
| 420 } | |
| 421 | |
| 422 /* Apply gamma to a set of colors - this is easy. :) */ | |
| 423 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, | |
| 424 int ncolors) | |
| 425 { | |
| 426 int i; | |
| 427 | |
| 428 for ( i=0; i<ncolors; ++i ) { | |
| 429 output[i].r = gamma[0*256 + colors[i].r] >> 8; | |
| 430 output[i].g = gamma[1*256 + colors[i].g] >> 8; | |
| 431 output[i].b = gamma[2*256 + colors[i].b] >> 8; | |
| 432 } | |
| 433 } | |
| 434 | |
| 435 /* Map from Palette to Palette */ | |
| 436 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) | |
| 437 { | |
| 438 Uint8 *map; | |
| 439 int i; | |
| 440 | |
| 441 if ( identical ) { | |
| 442 if ( src->ncolors <= dst->ncolors ) { | |
| 443 /* If an identical palette, no need to map */ | |
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444 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors* |
| 0 | 445 sizeof(SDL_Color)) == 0 ) { |
| 446 *identical = 1; | |
| 447 return(NULL); | |
| 448 } | |
| 449 } | |
| 450 *identical = 0; | |
| 451 } | |
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452 map = (Uint8 *)SDL_malloc(src->ncolors); |
| 0 | 453 if ( map == NULL ) { |
| 454 SDL_OutOfMemory(); | |
| 455 return(NULL); | |
| 456 } | |
| 457 for ( i=0; i<src->ncolors; ++i ) { | |
| 458 map[i] = SDL_FindColor(dst, | |
| 459 src->colors[i].r, src->colors[i].g, src->colors[i].b); | |
| 460 } | |
| 461 return(map); | |
| 462 } | |
| 463 /* Map from Palette to BitField */ | |
| 1557 | 464 static Uint8 *Map1toN(SDL_PixelFormat *src, SDL_PixelFormat *dst) |
| 0 | 465 { |
| 466 Uint8 *map; | |
| 467 int i; | |
| 468 int bpp; | |
| 50 | 469 unsigned alpha; |
| 1557 | 470 SDL_Palette *pal = src->palette; |
| 0 | 471 |
| 472 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); | |
| 1557 | 473 map = (Uint8 *)SDL_malloc(pal->ncolors*bpp); |
| 0 | 474 if ( map == NULL ) { |
| 475 SDL_OutOfMemory(); | |
| 476 return(NULL); | |
| 477 } | |
| 478 | |
| 1557 | 479 alpha = dst->Amask ? src->alpha : 0; |
| 0 | 480 /* We memory copy to the pixel map so the endianness is preserved */ |
| 1557 | 481 for ( i=0; i<pal->ncolors; ++i ) { |
| 0 | 482 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, |
| 1557 | 483 pal->colors[i].r, pal->colors[i].g, |
| 484 pal->colors[i].b, alpha); | |
| 0 | 485 } |
| 486 return(map); | |
| 487 } | |
| 488 /* Map from BitField to Dithered-Palette to Palette */ | |
| 1557 | 489 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical) |
| 0 | 490 { |
| 491 /* Generate a 256 color dither palette */ | |
| 492 SDL_Palette dithered; | |
| 493 SDL_Color colors[256]; | |
| 1557 | 494 SDL_Palette *pal = dst->palette; |
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495 |
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496 /* SDL_DitherColors does not initialize the 'unused' component of colors, |
| 1557 | 497 but Map1to1 compares it against pal, so we should initialize it. */ |
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498 SDL_memset(colors, 0, sizeof(colors)); |
| 0 | 499 |
| 500 dithered.ncolors = 256; | |
| 501 SDL_DitherColors(colors, 8); | |
| 502 dithered.colors = colors; | |
| 1557 | 503 return(Map1to1(&dithered, pal, identical)); |
| 0 | 504 } |
| 505 | |
| 506 SDL_BlitMap *SDL_AllocBlitMap(void) | |
| 507 { | |
| 508 SDL_BlitMap *map; | |
| 509 | |
| 510 /* Allocate the empty map */ | |
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511 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map)); |
| 0 | 512 if ( map == NULL ) { |
| 513 SDL_OutOfMemory(); | |
| 514 return(NULL); | |
| 515 } | |
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516 SDL_memset(map, 0, sizeof(*map)); |
| 0 | 517 |
| 518 /* Allocate the software blit data */ | |
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519 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data)); |
| 0 | 520 if ( map->sw_data == NULL ) { |
| 521 SDL_FreeBlitMap(map); | |
| 522 SDL_OutOfMemory(); | |
| 523 return(NULL); | |
| 524 } | |
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525 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); |
| 0 | 526 |
| 527 /* It's ready to go */ | |
| 528 return(map); | |
| 529 } | |
| 530 void SDL_InvalidateMap(SDL_BlitMap *map) | |
| 531 { | |
| 532 if ( ! map ) { | |
| 533 return; | |
| 534 } | |
| 535 map->dst = NULL; | |
| 536 map->format_version = (unsigned int)-1; | |
| 537 if ( map->table ) { | |
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538 SDL_free(map->table); |
| 0 | 539 map->table = NULL; |
| 540 } | |
| 541 } | |
| 542 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) | |
| 543 { | |
| 544 SDL_PixelFormat *srcfmt; | |
| 545 SDL_PixelFormat *dstfmt; | |
| 546 SDL_BlitMap *map; | |
| 547 | |
| 548 /* Clear out any previous mapping */ | |
| 549 map = src->map; | |
| 550 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 551 SDL_UnRLESurface(src, 1); | |
| 552 } | |
| 553 SDL_InvalidateMap(map); | |
| 554 | |
| 555 /* Figure out what kind of mapping we're doing */ | |
| 556 map->identity = 0; | |
| 557 srcfmt = src->format; | |
| 558 dstfmt = dst->format; | |
| 559 switch (srcfmt->BytesPerPixel) { | |
| 560 case 1: | |
| 561 switch (dstfmt->BytesPerPixel) { | |
| 562 case 1: | |
| 563 /* Palette --> Palette */ | |
| 564 /* If both SDL_HWSURFACE, assume have same palette */ | |
| 565 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 566 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 567 map->identity = 1; | |
| 568 } else { | |
| 569 map->table = Map1to1(srcfmt->palette, | |
| 570 dstfmt->palette, &map->identity); | |
| 571 } | |
| 572 if ( ! map->identity ) { | |
| 573 if ( map->table == NULL ) { | |
| 574 return(-1); | |
| 575 } | |
| 576 } | |
| 577 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) | |
| 578 map->identity = 0; | |
| 579 break; | |
| 580 | |
| 581 default: | |
| 582 /* Palette --> BitField */ | |
| 1557 | 583 map->table = Map1toN(srcfmt, dstfmt); |
| 0 | 584 if ( map->table == NULL ) { |
| 585 return(-1); | |
| 586 } | |
| 587 break; | |
| 588 } | |
| 589 break; | |
| 590 default: | |
| 591 switch (dstfmt->BytesPerPixel) { | |
| 592 case 1: | |
| 593 /* BitField --> Palette */ | |
| 1557 | 594 map->table = MapNto1(srcfmt, dstfmt, &map->identity); |
| 0 | 595 if ( ! map->identity ) { |
| 596 if ( map->table == NULL ) { | |
| 597 return(-1); | |
| 598 } | |
| 599 } | |
| 600 map->identity = 0; /* Don't optimize to copy */ | |
| 601 break; | |
| 602 default: | |
| 603 /* BitField --> BitField */ | |
| 604 if ( FORMAT_EQUAL(srcfmt, dstfmt) ) | |
| 605 map->identity = 1; | |
| 606 break; | |
| 607 } | |
| 608 break; | |
| 609 } | |
| 610 | |
| 611 map->dst = dst; | |
| 612 map->format_version = dst->format_version; | |
| 613 | |
| 614 /* Choose your blitters wisely */ | |
| 615 return(SDL_CalculateBlit(src)); | |
| 616 } | |
| 617 void SDL_FreeBlitMap(SDL_BlitMap *map) | |
| 618 { | |
| 619 if ( map ) { | |
| 620 SDL_InvalidateMap(map); | |
| 621 if ( map->sw_data != NULL ) { | |
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622 SDL_free(map->sw_data); |
| 0 | 623 } |
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624 SDL_free(map); |
| 0 | 625 } |
| 626 } |