annotate src/video/SDL_pixels.c @ 1336:3692456e7b0f

Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents 450721ad5436
children 604d73db6802
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
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23 /* General (mostly internal) pixel/color manipulation routines for SDL */
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24
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25 #include "SDL_error.h"
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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_stdlib.h"
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29 #include "SDL_string.h"
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30 #include "SDL_sysvideo.h"
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31 #include "SDL_blit.h"
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32 #include "SDL_pixels_c.h"
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33 #include "SDL_RLEaccel_c.h"
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34
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35 /* Helper functions */
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36 /*
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37 * Allocate a pixel format structure and fill it according to the given info.
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38 */
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39 SDL_PixelFormat *SDL_AllocFormat(int bpp,
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40 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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41 {
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42 SDL_PixelFormat *format;
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43 Uint32 mask;
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44
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45 /* Allocate an empty pixel format structure */
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46 format = SDL_malloc(sizeof(*format));
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47 if ( format == NULL ) {
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48 SDL_OutOfMemory();
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49 return(NULL);
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50 }
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51 SDL_memset(format, 0, sizeof(*format));
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52 format->alpha = SDL_ALPHA_OPAQUE;
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53
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54 /* Set up the format */
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55 format->BitsPerPixel = bpp;
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56 format->BytesPerPixel = (bpp+7)/8;
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57 if ( Rmask || Bmask || Gmask ) { /* Packed pixels with custom mask */
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58 format->palette = NULL;
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59 format->Rshift = 0;
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60 format->Rloss = 8;
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61 if ( Rmask ) {
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62 for ( mask = Rmask; !(mask&0x01); mask >>= 1 )
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63 ++format->Rshift;
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64 for ( ; (mask&0x01); mask >>= 1 )
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65 --format->Rloss;
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66 }
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67 format->Gshift = 0;
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68 format->Gloss = 8;
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69 if ( Gmask ) {
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70 for ( mask = Gmask; !(mask&0x01); mask >>= 1 )
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71 ++format->Gshift;
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72 for ( ; (mask&0x01); mask >>= 1 )
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73 --format->Gloss;
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74 }
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75 format->Bshift = 0;
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76 format->Bloss = 8;
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77 if ( Bmask ) {
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78 for ( mask = Bmask; !(mask&0x01); mask >>= 1 )
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79 ++format->Bshift;
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80 for ( ; (mask&0x01); mask >>= 1 )
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81 --format->Bloss;
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82 }
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83 format->Ashift = 0;
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84 format->Aloss = 8;
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85 if ( Amask ) {
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86 for ( mask = Amask; !(mask&0x01); mask >>= 1 )
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87 ++format->Ashift;
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88 for ( ; (mask&0x01); mask >>= 1 )
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89 --format->Aloss;
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90 }
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91 format->Rmask = Rmask;
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92 format->Gmask = Gmask;
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93 format->Bmask = Bmask;
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94 format->Amask = Amask;
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95 } else if ( bpp > 8 ) { /* Packed pixels with standard mask */
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96 /* R-G-B */
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97 if ( bpp > 24 )
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98 bpp = 24;
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99 format->Rloss = 8-(bpp/3);
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100 format->Gloss = 8-(bpp/3)-(bpp%3);
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101 format->Bloss = 8-(bpp/3);
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102 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3);
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103 format->Gshift = (bpp/3);
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104 format->Bshift = 0;
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105 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift);
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106 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift);
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107 format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift);
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108 } else {
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109 /* Palettized formats have no mask info */
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110 format->Rloss = 8;
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111 format->Gloss = 8;
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112 format->Bloss = 8;
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113 format->Aloss = 8;
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114 format->Rshift = 0;
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115 format->Gshift = 0;
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116 format->Bshift = 0;
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117 format->Ashift = 0;
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118 format->Rmask = 0;
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119 format->Gmask = 0;
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120 format->Bmask = 0;
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121 format->Amask = 0;
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122 }
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123 if ( bpp <= 8 ) { /* Palettized mode */
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124 int ncolors = 1<<bpp;
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125 #ifdef DEBUG_PALETTE
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126 fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors);
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127 #endif
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128 format->palette = (SDL_Palette *)SDL_malloc(sizeof(SDL_Palette));
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129 if ( format->palette == NULL ) {
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130 SDL_FreeFormat(format);
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131 SDL_OutOfMemory();
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132 return(NULL);
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133 }
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134 (format->palette)->ncolors = ncolors;
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135 (format->palette)->colors = (SDL_Color *)SDL_malloc(
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136 (format->palette)->ncolors*sizeof(SDL_Color));
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137 if ( (format->palette)->colors == NULL ) {
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138 SDL_FreeFormat(format);
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139 SDL_OutOfMemory();
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140 return(NULL);
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141 }
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142 if ( Rmask || Bmask || Gmask ) {
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143 /* create palette according to masks */
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144 int i;
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145 int Rm=0,Gm=0,Bm=0;
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146 int Rw=0,Gw=0,Bw=0;
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147 #ifdef ENABLE_PALETTE_ALPHA
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148 int Am=0,Aw=0;
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diff changeset
149 #endif
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150 if(Rmask)
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diff changeset
151 {
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diff changeset
152 Rw=8-format->Rloss;
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153 for(i=format->Rloss;i>0;i-=Rw)
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154 Rm|=1<<i;
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diff changeset
155 }
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diff changeset
156 #ifdef DEBUG_PALETTE
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157 fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm);
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158 #endif
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diff changeset
159 if(Gmask)
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diff changeset
160 {
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diff changeset
161 Gw=8-format->Gloss;
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162 for(i=format->Gloss;i>0;i-=Gw)
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163 Gm|=1<<i;
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164 }
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165 #ifdef DEBUG_PALETTE
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166 fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm);
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167 #endif
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168 if(Bmask)
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169 {
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170 Bw=8-format->Bloss;
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171 for(i=format->Bloss;i>0;i-=Bw)
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172 Bm|=1<<i;
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173 }
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174 #ifdef DEBUG_PALETTE
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175 fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm);
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176 #endif
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177 #ifdef ENABLE_PALETTE_ALPHA
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178 if(Amask)
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179 {
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180 Aw=8-format->Aloss;
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181 for(i=format->Aloss;i>0;i-=Aw)
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182 Am|=1<<i;
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183 }
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184 # ifdef DEBUG_PALETTE
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185 fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am);
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186 # endif
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187 #endif
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188 for(i=0; i < ncolors; ++i) {
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189 int r,g,b;
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190 r=(i&Rmask)>>format->Rshift;
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191 r=(r<<format->Rloss)|((r*Rm)>>Rw);
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192 format->palette->colors[i].r=r;
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193
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diff changeset
194 g=(i&Gmask)>>format->Gshift;
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195 g=(g<<format->Gloss)|((g*Gm)>>Gw);
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196 format->palette->colors[i].g=g;
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diff changeset
197
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diff changeset
198 b=(i&Bmask)>>format->Bshift;
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199 b=(b<<format->Bloss)|((b*Bm)>>Bw);
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200 format->palette->colors[i].b=b;
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201
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diff changeset
202 #ifdef ENABLE_PALETTE_ALPHA
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203 a=(i&Amask)>>format->Ashift;
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diff changeset
204 a=(a<<format->Aloss)|((a*Am)>>Aw);
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diff changeset
205 format->palette->colors[i].unused=a;
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diff changeset
206 #else
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207 format->palette->colors[i].unused=0;
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diff changeset
208 #endif
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diff changeset
209 }
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diff changeset
210 } else if ( ncolors == 2 ) {
1027
c69697a85412 Clarified the code in the pixel format allocation
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211 /* Create a black and white bitmap palette */
c69697a85412 Clarified the code in the pixel format allocation
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212 format->palette->colors[0].r = 0xFF;
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
213 format->palette->colors[0].g = 0xFF;
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
214 format->palette->colors[0].b = 0xFF;
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
215 format->palette->colors[1].r = 0x00;
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
216 format->palette->colors[1].g = 0x00;
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
217 format->palette->colors[1].b = 0x00;
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
218 } else {
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
219 /* Create an empty palette */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
220 SDL_memset((format->palette)->colors, 0,
1027
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diff changeset
221 (format->palette)->ncolors*sizeof(SDL_Color));
c69697a85412 Clarified the code in the pixel format allocation
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diff changeset
222 }
0
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diff changeset
223 }
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diff changeset
224 return(format);
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parents:
diff changeset
225 }
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diff changeset
226 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp,
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parents:
diff changeset
227 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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parents:
diff changeset
228 {
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parents:
diff changeset
229 if ( surface->format ) {
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parents:
diff changeset
230 SDL_FreeFormat(surface->format);
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parents:
diff changeset
231 SDL_FormatChanged(surface);
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parents:
diff changeset
232 }
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parents:
diff changeset
233 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
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parents:
diff changeset
234 return surface->format;
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parents:
diff changeset
235 }
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parents:
diff changeset
236
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parents:
diff changeset
237 /*
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parents:
diff changeset
238 * Change any previous mappings from/to the new surface format
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parents:
diff changeset
239 */
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parents:
diff changeset
240 void SDL_FormatChanged(SDL_Surface *surface)
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parents:
diff changeset
241 {
845
333db1d87876 Fixed a bug in detecting surface mapping changes
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
242 static int format_version = 0;
333db1d87876 Fixed a bug in detecting surface mapping changes
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
243 ++format_version;
333db1d87876 Fixed a bug in detecting surface mapping changes
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
244 if ( format_version < 0 ) { /* It wrapped... */
333db1d87876 Fixed a bug in detecting surface mapping changes
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parents: 769
diff changeset
245 format_version = 1;
333db1d87876 Fixed a bug in detecting surface mapping changes
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
246 }
333db1d87876 Fixed a bug in detecting surface mapping changes
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
247 surface->format_version = format_version;
0
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parents:
diff changeset
248 SDL_InvalidateMap(surface->map);
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parents:
diff changeset
249 }
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parents:
diff changeset
250 /*
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parents:
diff changeset
251 * Free a previously allocated format structure
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parents:
diff changeset
252 */
74212992fb08 Initial revision
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parents:
diff changeset
253 void SDL_FreeFormat(SDL_PixelFormat *format)
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parents:
diff changeset
254 {
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parents:
diff changeset
255 if ( format ) {
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parents:
diff changeset
256 if ( format->palette ) {
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parents:
diff changeset
257 if ( format->palette->colors ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
258 SDL_free(format->palette->colors);
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->palette);
0
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parents:
diff changeset
261 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
262 SDL_free(format);
0
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parents:
diff changeset
263 }
74212992fb08 Initial revision
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parents:
diff changeset
264 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 /*
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parents:
diff changeset
266 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
74212992fb08 Initial revision
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parents:
diff changeset
267 */
74212992fb08 Initial revision
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parents:
diff changeset
268 void SDL_DitherColors(SDL_Color *colors, int bpp)
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parents:
diff changeset
269 {
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parents:
diff changeset
270 int i;
74212992fb08 Initial revision
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parents:
diff changeset
271 if(bpp != 8)
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parents:
diff changeset
272 return; /* only 8bpp supported right now */
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parents:
diff changeset
273
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parents:
diff changeset
274 for(i = 0; i < 256; i++) {
74212992fb08 Initial revision
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parents:
diff changeset
275 int r, g, b;
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parents:
diff changeset
276 /* map each bit field to the full [0, 255] interval,
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parents:
diff changeset
277 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
74212992fb08 Initial revision
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parents:
diff changeset
278 r = i & 0xe0;
74212992fb08 Initial revision
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parents:
diff changeset
279 r |= r >> 3 | r >> 6;
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parents:
diff changeset
280 colors[i].r = r;
74212992fb08 Initial revision
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parents:
diff changeset
281 g = (i << 3) & 0xe0;
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parents:
diff changeset
282 g |= g >> 3 | g >> 6;
74212992fb08 Initial revision
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parents:
diff changeset
283 colors[i].g = g;
74212992fb08 Initial revision
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parents:
diff changeset
284 b = i & 0x3;
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parents:
diff changeset
285 b |= b << 2;
74212992fb08 Initial revision
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parents:
diff changeset
286 b |= b << 4;
74212992fb08 Initial revision
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parents:
diff changeset
287 colors[i].b = b;
74212992fb08 Initial revision
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parents:
diff changeset
288 }
74212992fb08 Initial revision
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parents:
diff changeset
289 }
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parents:
diff changeset
290 /*
74212992fb08 Initial revision
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parents:
diff changeset
291 * Calculate the pad-aligned scanline width of a surface
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diff changeset
292 */
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diff changeset
293 Uint16 SDL_CalculatePitch(SDL_Surface *surface)
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diff changeset
294 {
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295 Uint16 pitch;
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parents:
diff changeset
296
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diff changeset
297 /* Surface should be 4-byte aligned for speed */
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298 pitch = surface->w*surface->format->BytesPerPixel;
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diff changeset
299 switch (surface->format->BitsPerPixel) {
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300 case 1:
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301 pitch = (pitch+7)/8;
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diff changeset
302 break;
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diff changeset
303 case 4:
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diff changeset
304 pitch = (pitch+1)/2;
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parents:
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305 break;
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parents:
diff changeset
306 default:
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parents:
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307 break;
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diff changeset
308 }
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309 pitch = (pitch + 3) & ~3; /* 4-byte aligning */
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310 return(pitch);
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311 }
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parents:
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312 /*
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313 * Match an RGB value to a particular palette index
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diff changeset
314 */
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315 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b)
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316 {
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317 /* Do colorspace distance matching */
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diff changeset
318 unsigned int smallest;
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diff changeset
319 unsigned int distance;
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diff changeset
320 int rd, gd, bd;
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321 int i;
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322 Uint8 pixel=0;
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diff changeset
323
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324 smallest = ~0;
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325 for ( i=0; i<pal->ncolors; ++i ) {
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326 rd = pal->colors[i].r - r;
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327 gd = pal->colors[i].g - g;
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328 bd = pal->colors[i].b - b;
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329 distance = (rd*rd)+(gd*gd)+(bd*bd);
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330 if ( distance < smallest ) {
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331 pixel = i;
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332 if ( distance == 0 ) { /* Perfect match! */
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333 break;
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diff changeset
334 }
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335 smallest = distance;
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336 }
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337 }
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338 return(pixel);
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diff changeset
339 }
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diff changeset
340
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341 /* Find the opaque pixel value corresponding to an RGB triple */
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342 Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b)
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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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parents:
diff changeset
348 | format->Amask;
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diff changeset
349 } else {
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350 return SDL_FindColor(format->palette, r, g, b);
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parents:
diff changeset
351 }
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diff changeset
352 }
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parents:
diff changeset
353
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parents:
diff changeset
354 /* Find the pixel value corresponding to an RGBA quadruple */
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parents:
diff changeset
355 Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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parents:
diff changeset
356 {
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parents:
diff changeset
357 if ( format->palette == NULL ) {
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parents:
diff changeset
358 return (r >> format->Rloss) << format->Rshift
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parents:
diff changeset
359 | (g >> format->Gloss) << format->Gshift
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parents:
diff changeset
360 | (b >> format->Bloss) << format->Bshift
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parents:
diff changeset
361 | ((a >> format->Aloss) << format->Ashift & format->Amask);
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parents:
diff changeset
362 } else {
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parents:
diff changeset
363 return SDL_FindColor(format->palette, r, g, b);
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parents:
diff changeset
364 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
365 }
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diff changeset
366
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diff changeset
367 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt,
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parents:
diff changeset
368 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
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parents:
diff changeset
369 {
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parents:
diff changeset
370 if ( fmt->palette == NULL ) {
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parents:
diff changeset
371 /*
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parents:
diff changeset
372 * This makes sure that the result is mapped to the
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parents:
diff changeset
373 * interval [0..255], and the maximum value for each
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parents:
diff changeset
374 * component is 255. This is important to make sure
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parents:
diff changeset
375 * that white is indeed reported as (255, 255, 255),
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parents:
diff changeset
376 * and that opaque alpha is 255.
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parents:
diff changeset
377 * This only works for RGB bit fields at least 4 bit
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parents:
diff changeset
378 * wide, which is almost always the case.
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parents:
diff changeset
379 */
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
380 unsigned v;
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parents: 297
diff changeset
381 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
382 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
383 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
384 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
385 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
386 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
0
74212992fb08 Initial revision
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parents:
diff changeset
387 if(fmt->Amask) {
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
388 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
389 *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1)));
695
8f579a0e17e6 Whitespace
Sam Lantinga <slouken@libsdl.org>
parents: 688
diff changeset
390 } else {
0
74212992fb08 Initial revision
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parents:
diff changeset
391 *a = SDL_ALPHA_OPAQUE;
695
8f579a0e17e6 Whitespace
Sam Lantinga <slouken@libsdl.org>
parents: 688
diff changeset
392 }
0
74212992fb08 Initial revision
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diff changeset
393 } else {
74212992fb08 Initial revision
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parents:
diff changeset
394 *r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
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parents:
diff changeset
395 *g = fmt->palette->colors[pixel].g;
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parents:
diff changeset
396 *b = fmt->palette->colors[pixel].b;
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parents:
diff changeset
397 *a = SDL_ALPHA_OPAQUE;
74212992fb08 Initial revision
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parents:
diff changeset
398 }
74212992fb08 Initial revision
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parents:
diff changeset
399 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400
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parents:
diff changeset
401 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b)
74212992fb08 Initial revision
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parents:
diff changeset
402 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 if ( fmt->palette == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 /* the note for SDL_GetRGBA above applies here too */
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
405 unsigned v;
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
406 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
407 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
408 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
409 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
410 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
411 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
0
74212992fb08 Initial revision
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parents:
diff changeset
412 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 *r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
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parents:
diff changeset
414 *g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 *b = fmt->palette->colors[pixel].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418
74212992fb08 Initial revision
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parents:
diff changeset
419 /* Apply gamma to a set of colors - this is easy. :) */
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parents:
diff changeset
420 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 int ncolors)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 for ( i=0; i<ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 output[i].r = gamma[0*256 + colors[i].r] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 output[i].g = gamma[1*256 + colors[i].g] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 output[i].b = gamma[2*256 + colors[i].b] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 /* Map from Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 if ( identical ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 if ( src->ncolors <= dst->ncolors ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 /* 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
441 if ( SDL_memcmp(src->colors, dst->colors, src->ncolors*
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 sizeof(SDL_Color)) == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 *identical = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 *identical = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
449 map = (Uint8 *)SDL_malloc(src->ncolors);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 map[i] = SDL_FindColor(dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 src->colors[i].r, src->colors[i].g, src->colors[i].b);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 /* Map from Palette to BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 int bpp;
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
466 unsigned alpha;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 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
469 map = (Uint8 *)SDL_malloc(src->ncolors*bpp);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
475 alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 /* We memory copy to the pixel map so the endianness is preserved */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 src->colors[i].r, src->colors[i].g,
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
480 src->colors[i].b, alpha);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 /* Map from BitField to Dithered-Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 /* Generate a 256 color dither palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 SDL_Palette dithered;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 SDL_Color colors[256];
997
3bf4103b2b89 Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 845
diff changeset
490
3bf4103b2b89 Date: Sat, 27 Nov 2004 13:35:43 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 845
diff changeset
491 /* 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
492 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
493 SDL_memset(colors, 0, sizeof(colors));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 dithered.ncolors = 256;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 SDL_DitherColors(colors, 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 dithered.colors = colors;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498 return(Map1to1(&dithered, dst, identical));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 }
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 *SDL_AllocBlitMap(void)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 /* Allocate the empty map */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
506 map = (SDL_BlitMap *)SDL_malloc(sizeof(*map));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
511 SDL_memset(map, 0, sizeof(*map));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 /* Allocate the software blit data */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
514 map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 if ( map->sw_data == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 SDL_FreeBlitMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
520 SDL_memset(map->sw_data, 0, sizeof(*map->sw_data));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522 /* It's ready to go */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 return(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 void SDL_InvalidateMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 if ( ! map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 map->dst = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531 map->format_version = (unsigned int)-1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
532 if ( map->table ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
533 SDL_free(map->table);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 map->table = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
535 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
537 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 SDL_PixelFormat *srcfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540 SDL_PixelFormat *dstfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 /* Clear out any previous mapping */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
544 map = src->map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
546 SDL_UnRLESurface(src, 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
547 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
548 SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
549
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550 /* Figure out what kind of mapping we're doing */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552 srcfmt = src->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
553 dstfmt = dst->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
554 switch (srcfmt->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 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
558 /* Palette --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559 /* If both SDL_HWSURFACE, assume have same palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
560 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
562 map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
563 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
564 map->table = Map1to1(srcfmt->palette,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
565 dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
566 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
568 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
570 }
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 (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
573 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
574 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
575
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
576 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
577 /* Palette --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
578 map->table = Map1toN(srcfmt->palette, dstfmt);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
579 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580 return(-1);
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 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
584 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
587 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
588 /* BitField --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589 map->table = MapNto1(srcfmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
590 dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
594 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596 map->identity = 0; /* Don't optimize to copy */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
598 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599 /* BitField --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
600 if ( FORMAT_EQUAL(srcfmt, dstfmt) )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601 map->identity = 1;
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 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
606
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607 map->dst = dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
608 map->format_version = dst->format_version;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610 /* Choose your blitters wisely */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611 return(SDL_CalculateBlit(src));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
612 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613 void SDL_FreeBlitMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
615 if ( map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
616 SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
617 if ( map->sw_data != NULL ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
618 SDL_free(map->sw_data);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
619 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
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620 SDL_free(map);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
621 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
622 }