annotate src/video/SDL_pixels.c @ 1402:d910939febfa

Use consistent identifiers for the various platforms we support. Make sure every source file includes SDL_config.h, so the proper system headers are chosen.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Feb 2006 08:46:50 +0000
parents c71e05b4dc2e
children 61c237f69076
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* General (mostly internal) pixel/color manipulation routines for SDL */
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25
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26 #include "SDL_endian.h"
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27 #include "SDL_video.h"
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28 #include "SDL_sysvideo.h"
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29 #include "SDL_blit.h"
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30 #include "SDL_pixels_c.h"
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31 #include "SDL_RLEaccel_c.h"
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32
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33 /* Helper functions */
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34 /*
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35 * Allocate a pixel format structure and fill it according to the given info.
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36 */
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37 SDL_PixelFormat *SDL_AllocFormat(int bpp,
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38 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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39 {
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40 SDL_PixelFormat *format;
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41 Uint32 mask;
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42
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43 /* Allocate an empty pixel format structure */
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44 format = SDL_malloc(sizeof(*format));
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45 if ( format == NULL ) {
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46 SDL_OutOfMemory();
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47 return(NULL);
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48 }
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49 SDL_memset(format, 0, sizeof(*format));
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50 format->alpha = SDL_ALPHA_OPAQUE;
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51
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52 /* Set up the format */
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53 format->BitsPerPixel = bpp;
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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 */
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94 /* R-G-B */
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95 if ( bpp > 24 )
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96 bpp = 24;
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97 format->Rloss = 8-(bpp/3);
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98 format->Gloss = 8-(bpp/3)-(bpp%3);
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99 format->Bloss = 8-(bpp/3);
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100 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3);
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101 format->Gshift = (bpp/3);
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102 format->Bshift = 0;
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103 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift);
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104 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift);
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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 ) {
1027
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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;
c69697a85412 Clarified the code in the pixel format allocation
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212 format->palette->colors[0].b = 0xFF;
c69697a85412 Clarified the code in the pixel format allocation
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213 format->palette->colors[1].r = 0x00;
c69697a85412 Clarified the code in the pixel format allocation
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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 */
1336
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218 SDL_memset((format->palette)->colors, 0,
1027
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219 (format->palette)->ncolors*sizeof(SDL_Color));
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220 }
0
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221 }
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222 return(format);
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223 }
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224 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp,
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diff changeset
225 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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226 {
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227 if ( surface->format ) {
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228 SDL_FreeFormat(surface->format);
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229 SDL_FormatChanged(surface);
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230 }
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231 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
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232 return surface->format;
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233 }
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234
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235 /*
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parents:
diff changeset
236 * Change any previous mappings from/to the new surface format
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parents:
diff changeset
237 */
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parents:
diff changeset
238 void SDL_FormatChanged(SDL_Surface *surface)
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diff changeset
239 {
845
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diff changeset
240 static int format_version = 0;
333db1d87876 Fixed a bug in detecting surface mapping changes
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diff changeset
241 ++format_version;
333db1d87876 Fixed a bug in detecting surface mapping changes
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diff changeset
242 if ( format_version < 0 ) { /* It wrapped... */
333db1d87876 Fixed a bug in detecting surface mapping changes
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diff changeset
243 format_version = 1;
333db1d87876 Fixed a bug in detecting surface mapping changes
Sam Lantinga <slouken@libsdl.org>
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diff changeset
244 }
333db1d87876 Fixed a bug in detecting surface mapping changes
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diff changeset
245 surface->format_version = format_version;
0
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diff changeset
246 SDL_InvalidateMap(surface->map);
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diff changeset
247 }
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parents:
diff changeset
248 /*
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parents:
diff changeset
249 * Free a previously allocated format structure
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parents:
diff changeset
250 */
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parents:
diff changeset
251 void SDL_FreeFormat(SDL_PixelFormat *format)
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parents:
diff changeset
252 {
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parents:
diff changeset
253 if ( format ) {
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parents:
diff changeset
254 if ( format->palette ) {
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diff changeset
255 if ( format->palette->colors ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
256 SDL_free(format->palette->colors);
0
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diff changeset
257 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
258 SDL_free(format->palette);
0
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parents:
diff changeset
259 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1330
diff changeset
260 SDL_free(format);
0
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parents:
diff changeset
261 }
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parents:
diff changeset
262 }
74212992fb08 Initial revision
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parents:
diff changeset
263 /*
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parents:
diff changeset
264 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
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parents:
diff changeset
265 */
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parents:
diff changeset
266 void SDL_DitherColors(SDL_Color *colors, int bpp)
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parents:
diff changeset
267 {
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parents:
diff changeset
268 int i;
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parents:
diff changeset
269 if(bpp != 8)
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parents:
diff changeset
270 return; /* only 8bpp supported right now */
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parents:
diff changeset
271
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parents:
diff changeset
272 for(i = 0; i < 256; i++) {
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parents:
diff changeset
273 int r, g, b;
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parents:
diff changeset
274 /* map each bit field to the full [0, 255] interval,
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parents:
diff changeset
275 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
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parents:
diff changeset
276 r = i & 0xe0;
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parents:
diff changeset
277 r |= r >> 3 | r >> 6;
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parents:
diff changeset
278 colors[i].r = r;
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parents:
diff changeset
279 g = (i << 3) & 0xe0;
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parents:
diff changeset
280 g |= g >> 3 | g >> 6;
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parents:
diff changeset
281 colors[i].g = g;
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parents:
diff changeset
282 b = i & 0x3;
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parents:
diff changeset
283 b |= b << 2;
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parents:
diff changeset
284 b |= b << 4;
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parents:
diff changeset
285 colors[i].b = b;
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parents:
diff changeset
286 }
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parents:
diff changeset
287 }
74212992fb08 Initial revision
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parents:
diff changeset
288 /*
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parents:
diff changeset
289 * Calculate the pad-aligned scanline width of a surface
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parents:
diff changeset
290 */
74212992fb08 Initial revision
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parents:
diff changeset
291 Uint16 SDL_CalculatePitch(SDL_Surface *surface)
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parents:
diff changeset
292 {
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293 Uint16 pitch;
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parents:
diff changeset
294
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295 /* Surface should be 4-byte aligned for speed */
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diff changeset
296 pitch = surface->w*surface->format->BytesPerPixel;
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parents:
diff changeset
297 switch (surface->format->BitsPerPixel) {
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diff changeset
298 case 1:
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diff changeset
299 pitch = (pitch+7)/8;
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diff changeset
300 break;
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parents:
diff changeset
301 case 4:
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diff changeset
302 pitch = (pitch+1)/2;
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parents:
diff changeset
303 break;
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parents:
diff changeset
304 default:
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parents:
diff changeset
305 break;
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parents:
diff changeset
306 }
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307 pitch = (pitch + 3) & ~3; /* 4-byte aligning */
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parents:
diff changeset
308 return(pitch);
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parents:
diff changeset
309 }
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parents:
diff changeset
310 /*
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parents:
diff changeset
311 * Match an RGB value to a particular palette index
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diff changeset
312 */
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313 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b)
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parents:
diff changeset
314 {
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parents:
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315 /* Do colorspace distance matching */
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parents:
diff changeset
316 unsigned int smallest;
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parents:
diff changeset
317 unsigned int distance;
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diff changeset
318 int rd, gd, bd;
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diff changeset
319 int i;
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320 Uint8 pixel=0;
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parents:
diff changeset
321
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322 smallest = ~0;
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parents:
diff changeset
323 for ( i=0; i<pal->ncolors; ++i ) {
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diff changeset
324 rd = pal->colors[i].r - r;
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diff changeset
325 gd = pal->colors[i].g - g;
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diff changeset
326 bd = pal->colors[i].b - b;
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diff changeset
327 distance = (rd*rd)+(gd*gd)+(bd*bd);
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parents:
diff changeset
328 if ( distance < smallest ) {
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diff changeset
329 pixel = i;
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diff changeset
330 if ( distance == 0 ) { /* Perfect match! */
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parents:
diff changeset
331 break;
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parents:
diff changeset
332 }
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333 smallest = distance;
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parents:
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334 }
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335 }
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336 return(pixel);
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parents:
diff changeset
337 }
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parents:
diff changeset
338
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parents:
diff changeset
339 /* Find the opaque pixel value corresponding to an RGB triple */
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340 Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b)
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parents:
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341 {
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diff changeset
342 if ( format->palette == NULL ) {
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diff changeset
343 return (r >> format->Rloss) << format->Rshift
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344 | (g >> format->Gloss) << format->Gshift
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parents:
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345 | (b >> format->Bloss) << format->Bshift
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parents:
diff changeset
346 | format->Amask;
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parents:
diff changeset
347 } else {
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diff changeset
348 return SDL_FindColor(format->palette, r, g, b);
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parents:
diff changeset
349 }
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parents:
diff changeset
350 }
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parents:
diff changeset
351
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parents:
diff changeset
352 /* Find the pixel value corresponding to an RGBA quadruple */
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parents:
diff changeset
353 Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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parents:
diff changeset
354 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
355 if ( format->palette == NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
356 return (r >> format->Rloss) << format->Rshift
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parents:
diff changeset
357 | (g >> format->Gloss) << format->Gshift
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parents:
diff changeset
358 | (b >> format->Bloss) << format->Bshift
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parents:
diff changeset
359 | ((a >> format->Aloss) << format->Ashift & format->Amask);
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parents:
diff changeset
360 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
361 return SDL_FindColor(format->palette, r, g, b);
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parents:
diff changeset
362 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
363 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
364
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
365 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt,
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
366 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
367 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
368 if ( fmt->palette == NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
369 /*
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
370 * This makes sure that the result is mapped to the
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
371 * interval [0..255], and the maximum value for each
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
372 * component is 255. This is important to make sure
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
373 * that white is indeed reported as (255, 255, 255),
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
374 * and that opaque alpha is 255.
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parents:
diff changeset
375 * This only works for RGB bit fields at least 4 bit
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parents:
diff changeset
376 * wide, which is almost always the case.
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
377 */
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
378 unsigned v;
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
379 v = (pixel & fmt->Rmask) >> fmt->Rshift;
688
c0522010bb6d Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents: 628
diff changeset
380 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
381 v = (pixel & fmt->Gmask) >> fmt->Gshift;
688
c0522010bb6d Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents: 628
diff changeset
382 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
383 v = (pixel & fmt->Bmask) >> fmt->Bshift;
688
c0522010bb6d Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents: 628
diff changeset
384 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385 if(fmt->Amask) {
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
386 v = (pixel & fmt->Amask) >> fmt->Ashift;
688
c0522010bb6d Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents: 628
diff changeset
387 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1)));
695
8f579a0e17e6 Whitespace
Sam Lantinga <slouken@libsdl.org>
parents: 688
diff changeset
388 } else {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
389 *a = SDL_ALPHA_OPAQUE;
695
8f579a0e17e6 Whitespace
Sam Lantinga <slouken@libsdl.org>
parents: 688
diff changeset
390 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
392 *r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393 *g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 *b = fmt->palette->colors[pixel].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395 *a = SDL_ALPHA_OPAQUE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
397 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 if ( fmt->palette == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 /* the note for SDL_GetRGBA above applies here too */
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
403 unsigned v;
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
404 v = (pixel & fmt->Rmask) >> fmt->Rshift;
688
c0522010bb6d Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents: 628
diff changeset
405 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
406 v = (pixel & fmt->Gmask) >> fmt->Gshift;
688
c0522010bb6d Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents: 628
diff changeset
407 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
408 v = (pixel & fmt->Bmask) >> fmt->Bshift;
688
c0522010bb6d Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
Sam Lantinga <slouken@libsdl.org>
parents: 628
diff changeset
409 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411 *r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 *g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 *b = fmt->palette->colors[pixel].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 /* Apply gamma to a set of colors - this is easy. :) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 int ncolors)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 for ( i=0; i<ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 output[i].r = gamma[0*256 + colors[i].r] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 output[i].g = gamma[1*256 + colors[i].g] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 output[i].b = gamma[2*256 + colors[i].b] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 /* Map from Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 if ( identical ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 if ( src->ncolors <= dst->ncolors ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 /* If an identical palette, no need to map */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
439 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors*
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 sizeof(SDL_Color)) == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 *identical = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 *identical = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
447 map = (Uint8 *)SDL_malloc(src->ncolors);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 map[i] = SDL_FindColor(dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 src->colors[i].r, src->colors[i].g, src->colors[i].b);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 /* Map from Palette to BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 int bpp;
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
464 unsigned alpha;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
467 map = (Uint8 *)SDL_malloc(src->ncolors*bpp);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
473 alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 /* We memory copy to the pixel map so the endianness is preserved */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 src->colors[i].r, src->colors[i].g,
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
478 src->colors[i].b, alpha);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 /* Map from BitField to Dithered-Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 /* Generate a 256 color dither palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 SDL_Palette dithered;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 SDL_Color colors[256];
997
3bf4103b2b89 Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 845
diff changeset
488
3bf4103b2b89 Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 845
diff changeset
489 /* SDL_DitherColors does not initialize the 'unused' component of colors,
3bf4103b2b89 Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 845
diff changeset
490 but Map1to1 compares it against dst, so we should initialize it. */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
491 SDL_memset(colors, 0, sizeof(colors));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493 dithered.ncolors = 256;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494 SDL_DitherColors(colors, 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 dithered.colors = colors;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 return(Map1to1(&dithered, dst, identical));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 SDL_BlitMap *SDL_AllocBlitMap(void)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 /* Allocate the empty map */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
504 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
509 SDL_memset(map, 0, sizeof(*map));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511 /* Allocate the software blit data */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
512 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 if ( map->sw_data == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514 SDL_FreeBlitMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
518 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520 /* It's ready to go */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 void SDL_InvalidateMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
524 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
525 if ( ! map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528 map->dst = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 map->format_version = (unsigned int)-1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 if ( map->table ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
531 SDL_free(map->table);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
532 map->table = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
533 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
535 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
537 SDL_PixelFormat *srcfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 SDL_PixelFormat *dstfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 /* Clear out any previous mapping */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542 map = src->map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
544 SDL_UnRLESurface(src, 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
546 SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
547
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
548 /* Figure out what kind of mapping we're doing */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
549 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550 srcfmt = src->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551 dstfmt = dst->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552 switch (srcfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
553 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
554 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
555 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
556 /* Palette --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 /* If both SDL_HWSURFACE, assume have same palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
558 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
560 map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
562 map->table = Map1to1(srcfmt->palette,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
563 dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
564 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
565 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
566 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
568 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
570 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
571 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
572 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
573
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
574 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
575 /* Palette --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
576 map->table = Map1toN(srcfmt->palette, dstfmt);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
577 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
578 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
579 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
582 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
583 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
584 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586 /* BitField --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
587 map->table = MapNto1(srcfmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
588 dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
590 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
594 map->identity = 0; /* Don't optimize to copy */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597 /* BitField --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
598 if ( FORMAT_EQUAL(srcfmt, dstfmt) )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599 map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
600 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
602 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
603 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
604
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 map->dst = dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
606 map->format_version = dst->format_version;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
608 /* Choose your blitters wisely */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609 return(SDL_CalculateBlit(src));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611 void SDL_FreeBlitMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
612 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613 if ( map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614 SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
615 if ( map->sw_data != NULL ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
616 SDL_free(map->sw_data);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
617 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
618 SDL_free(map);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
619 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
620 }