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
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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;
c69697a85412 Clarified the code in the pixel format allocation
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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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diff changeset
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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diff changeset
230 }
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diff changeset
231 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
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diff changeset
232 return surface->format;
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diff changeset
233 }
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diff changeset
234
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diff changeset
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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parents:
diff changeset
239 {
845
333db1d87876 Fixed a bug in detecting surface mapping changes
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diff changeset
240 static int format_version = 0;
333db1d87876 Fixed a bug in detecting surface mapping changes
Sam Lantinga <slouken@libsdl.org>
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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>
parents: 769
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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parents:
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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parents: 1330
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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parents: 1330
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 }
74212992fb08 Initial revision
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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;
74212992fb08 Initial revision
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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;
74212992fb08 Initial revision
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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 /*
74212992fb08 Initial revision
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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 */
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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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parents:
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295 /* Surface should be 4-byte aligned for speed */
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parents:
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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parents:
diff changeset
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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parents:
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:
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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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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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parents:
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330 if ( distance == 0 ) { /* Perfect match! */
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parents:
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331 break;
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parents:
diff changeset
332 }
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333 smallest = distance;
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parents:
diff changeset
334 }
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335 }
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336 return(pixel);
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diff changeset
337 }
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diff changeset
338
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339 /* Find the opaque pixel value corresponding to an RGB triple */
3932
cd5b5c52a37e Const correctness patch for SDL_MapRGB and SDL_MapRGBA.
Ryan C. Gordon <icculus@icculus.org>
parents: 1557
diff changeset
340 Uint32 SDL_MapRGB
cd5b5c52a37e Const correctness patch for SDL_MapRGB and SDL_MapRGBA.
Ryan C. Gordon <icculus@icculus.org>
parents: 1557
diff changeset
341 (const SDL_PixelFormat * const format,
cd5b5c52a37e Const correctness patch for SDL_MapRGB and SDL_MapRGBA.
Ryan C. Gordon <icculus@icculus.org>
parents: 1557
diff changeset
342 const Uint8 r, const Uint8 g, const Uint8 b)
0
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diff changeset
343 {
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344 if ( format->palette == NULL ) {
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345 return (r >> format->Rloss) << format->Rshift
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346 | (g >> format->Gloss) << format->Gshift
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347 | (b >> format->Bloss) << format->Bshift
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diff changeset
348 | format->Amask;
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parents:
diff changeset
349 } else {
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diff changeset
350 return SDL_FindColor(format->palette, r, g, b);
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diff changeset
351 }
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diff changeset
352 }
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diff changeset
353
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diff changeset
354 /* Find the pixel value corresponding to an RGBA quadruple */
3932
cd5b5c52a37e Const correctness patch for SDL_MapRGB and SDL_MapRGBA.
Ryan C. Gordon <icculus@icculus.org>
parents: 1557
diff changeset
355 Uint32 SDL_MapRGBA
cd5b5c52a37e Const correctness patch for SDL_MapRGB and SDL_MapRGBA.
Ryan C. Gordon <icculus@icculus.org>
parents: 1557
diff changeset
356 (const SDL_PixelFormat * const format,
cd5b5c52a37e Const correctness patch for SDL_MapRGB and SDL_MapRGBA.
Ryan C. Gordon <icculus@icculus.org>
parents: 1557
diff changeset
357 const Uint8 r, const Uint8 g, const Uint8 b, const Uint8 a)
0
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parents:
diff changeset
358 {
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parents:
diff changeset
359 if ( format->palette == NULL ) {
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parents:
diff changeset
360 return (r >> format->Rloss) << format->Rshift
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parents:
diff changeset
361 | (g >> format->Gloss) << format->Gshift
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parents:
diff changeset
362 | (b >> format->Bloss) << format->Bshift
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parents:
diff changeset
363 | ((a >> format->Aloss) << format->Ashift & format->Amask);
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parents:
diff changeset
364 } else {
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parents:
diff changeset
365 return SDL_FindColor(format->palette, r, g, b);
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parents:
diff changeset
366 }
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parents:
diff changeset
367 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
368
4173
34068be6aa0b Fixed bug #421
Sam Lantinga <slouken@libsdl.org>
parents: 4159
diff changeset
369 void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * const fmt,
0
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parents:
diff changeset
370 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
371 {
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parents:
diff changeset
372 if ( fmt->palette == NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
373 /*
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parents:
diff changeset
374 * This makes sure that the result is mapped to the
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parents:
diff changeset
375 * interval [0..255], and the maximum value for each
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
376 * component is 255. This is important to make sure
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
377 * that white is indeed reported as (255, 255, 255),
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
378 * and that opaque alpha is 255.
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
379 * This only works for RGB bit fields at least 4 bit
74212992fb08 Initial revision
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parents:
diff changeset
380 * wide, which is almost always the case.
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
381 */
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
382 unsigned v;
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
383 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
384 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
385 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
386 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
387 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
388 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
389 if(fmt->Amask) {
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
390 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
391 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1)));
695
8f579a0e17e6 Whitespace
Sam Lantinga <slouken@libsdl.org>
parents: 688
diff changeset
392 } else {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393 *a = SDL_ALPHA_OPAQUE;
695
8f579a0e17e6 Whitespace
Sam Lantinga <slouken@libsdl.org>
parents: 688
diff changeset
394 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 *r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
397 *g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398 *b = fmt->palette->colors[pixel].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 *a = SDL_ALPHA_OPAQUE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402
4173
34068be6aa0b Fixed bug #421
Sam Lantinga <slouken@libsdl.org>
parents: 4159
diff changeset
403 void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * const fmt,
34068be6aa0b Fixed bug #421
Sam Lantinga <slouken@libsdl.org>
parents: 4159
diff changeset
404 Uint8 *r,Uint8 *g,Uint8 *b)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 if ( fmt->palette == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 /* the note for SDL_GetRGBA above applies here too */
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
408 unsigned v;
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
409 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
410 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
411 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
412 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
413 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
414 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 *r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 *g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 *b = fmt->palette->colors[pixel].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 /* Apply gamma to a set of colors - this is easy. :) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 int ncolors)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 for ( i=0; i<ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 output[i].r = gamma[0*256 + colors[i].r] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 output[i].g = gamma[1*256 + colors[i].g] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 output[i].b = gamma[2*256 + colors[i].b] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 /* Map from Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 if ( identical ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 if ( src->ncolors <= dst->ncolors ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 /* 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
444 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors*
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 sizeof(SDL_Color)) == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 *identical = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 *identical = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
452 map = (Uint8 *)SDL_malloc(src->ncolors);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 map[i] = SDL_FindColor(dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 src->colors[i].r, src->colors[i].g, src->colors[i].b);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 /* Map from Palette to BitField */
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
464 static Uint8 *Map1toN(SDL_PixelFormat *src, SDL_PixelFormat *dst)
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 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 int bpp;
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
469 unsigned alpha;
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
470 SDL_Palette *pal = src->palette;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
473 map = (Uint8 *)SDL_malloc(pal->ncolors*bpp);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
479 alpha = dst->Amask ? src->alpha : 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 /* We memory copy to the pixel map so the endianness is preserved */
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
481 for ( i=0; i<pal->ncolors; ++i ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst,
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
483 pal->colors[i].r, pal->colors[i].g,
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
484 pal->colors[i].b, alpha);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 /* Map from BitField to Dithered-Palette to Palette */
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
489 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 /* Generate a 256 color dither palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 SDL_Palette dithered;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493 SDL_Color colors[256];
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
494 SDL_Palette *pal = dst->palette;
997
3bf4103b2b89 Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 845
diff changeset
495
3bf4103b2b89 Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 845
diff changeset
496 /* SDL_DitherColors does not initialize the 'unused' component of colors,
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
497 but Map1to1 compares it against pal, so we should initialize it. */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
498 SDL_memset(colors, 0, sizeof(colors));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 dithered.ncolors = 256;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 SDL_DitherColors(colors, 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 dithered.colors = colors;
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
503 return(Map1to1(&dithered, pal, identical));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 SDL_BlitMap *SDL_AllocBlitMap(void)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 /* Allocate the empty map */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
511 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
516 SDL_memset(map, 0, sizeof(*map));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 /* Allocate the software blit data */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
519 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520 if ( map->sw_data == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521 SDL_FreeBlitMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
524 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
525 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 /* It's ready to go */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 void SDL_InvalidateMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
532 if ( ! map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
533 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
535 map->dst = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 map->format_version = (unsigned int)-1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
537 if ( map->table ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
538 SDL_free(map->table);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 map->table = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
544 SDL_PixelFormat *srcfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545 SDL_PixelFormat *dstfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
546 SDL_BlitMap *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 /* Clear out any previous mapping */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
549 map = src->map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551 SDL_UnRLESurface(src, 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
553 SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
554
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
555 /* Figure out what kind of mapping we're doing */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
556 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 srcfmt = src->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
558 dstfmt = dst->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559 switch (srcfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
560 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
562 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
563 /* Palette --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
564 /* If both SDL_HWSURFACE, assume have same palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
565 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
566 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567 map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
568 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569 map->table = Map1to1(srcfmt->palette,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
570 dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
571 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
572 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
573 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
574 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
575 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
576 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
577 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
578 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
579 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
582 /* Palette --> BitField */
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
583 map->table = Map1toN(srcfmt, dstfmt);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
584 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
587 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
588 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
590 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 /* BitField --> Palette */
1557
61c237f69076 Fixed bug #90
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
594 map->table = MapNto1(srcfmt, dstfmt, &map->identity);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
598 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
600 map->identity = 0; /* Don't optimize to copy */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
602 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
603 /* BitField --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
604 if ( FORMAT_EQUAL(srcfmt, dstfmt) )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
606 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
608 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611 map->dst = dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
612 map->format_version = dst->format_version;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614 /* Choose your blitters wisely */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
615 return(SDL_CalculateBlit(src));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
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616 }
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617 void SDL_FreeBlitMap(SDL_BlitMap *map)
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618 {
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619 if ( map ) {
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620 SDL_InvalidateMap(map);
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621 if ( map->sw_data != NULL ) {
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622 SDL_free(map->sw_data);
0
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623 }
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624 SDL_free(map);
0
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625 }
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626 }