annotate src/video/SDL_pixels.c @ 769:b8d311d90021

Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents 8f579a0e17e6
children 333db1d87876
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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e8157fcb3114 Updated the source with the correct e-mail address
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* General (mostly internal) pixel/color manipulation routines for SDL */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_endian.h"
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36 #include "SDL_video.h"
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37 #include "SDL_sysvideo.h"
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38 #include "SDL_blit.h"
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39 #include "SDL_pixels_c.h"
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40 #include "SDL_RLEaccel_c.h"
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41
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42 /* Helper functions */
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43 /*
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44 * Allocate a pixel format structure and fill it according to the given info.
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45 */
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46 SDL_PixelFormat *SDL_AllocFormat(int bpp,
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47 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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48 {
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49 SDL_PixelFormat *format;
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50 Uint32 mask;
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51
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52 /* Allocate an empty pixel format structure */
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53 format = malloc(sizeof(*format));
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54 if ( format == NULL ) {
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55 SDL_OutOfMemory();
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56 return(NULL);
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57 }
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58 memset(format, 0, sizeof(*format));
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59 format->alpha = SDL_ALPHA_OPAQUE;
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60
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61 /* Set up the format */
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62 format->BitsPerPixel = bpp;
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63 format->BytesPerPixel = (bpp+7)/8;
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64 switch (bpp) {
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65 case 1:
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66 /* Create the 2 color black-white palette */
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67 format->palette = (SDL_Palette *)malloc(
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68 sizeof(SDL_Palette));
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69 if ( format->palette == NULL ) {
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70 SDL_FreeFormat(format);
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71 SDL_OutOfMemory();
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72 return(NULL);
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73 }
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74 (format->palette)->ncolors = 2;
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75 (format->palette)->colors = (SDL_Color *)malloc(
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76 (format->palette)->ncolors*sizeof(SDL_Color));
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77 if ( (format->palette)->colors == NULL ) {
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78 SDL_FreeFormat(format);
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79 SDL_OutOfMemory();
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80 return(NULL);
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81 }
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82 format->palette->colors[0].r = 0xFF;
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83 format->palette->colors[0].g = 0xFF;
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84 format->palette->colors[0].b = 0xFF;
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85 format->palette->colors[1].r = 0x00;
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86 format->palette->colors[1].g = 0x00;
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87 format->palette->colors[1].b = 0x00;
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88 format->Rloss = 8;
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89 format->Gloss = 8;
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90 format->Bloss = 8;
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91 format->Aloss = 8;
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92 format->Rshift = 0;
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93 format->Gshift = 0;
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94 format->Bshift = 0;
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95 format->Ashift = 0;
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96 format->Rmask = 0;
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97 format->Gmask = 0;
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98 format->Bmask = 0;
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99 format->Amask = 0;
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100 break;
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101
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102 case 4:
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103 /* Create the 16 color VGA palette */
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104 format->palette = (SDL_Palette *)malloc(
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105 sizeof(SDL_Palette));
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106 if ( format->palette == NULL ) {
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107 SDL_FreeFormat(format);
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108 SDL_OutOfMemory();
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109 return(NULL);
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110 }
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111 (format->palette)->ncolors = 16;
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112 (format->palette)->colors = (SDL_Color *)malloc(
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113 (format->palette)->ncolors*sizeof(SDL_Color));
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114 if ( (format->palette)->colors == NULL ) {
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115 SDL_FreeFormat(format);
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116 SDL_OutOfMemory();
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117 return(NULL);
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118 }
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119 /* Punt for now, will this ever be used? */
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120 memset((format->palette)->colors, 0,
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121 (format->palette)->ncolors*sizeof(SDL_Color));
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122
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123 /* Palettized formats have no mask info */
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124 format->Rloss = 8;
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125 format->Gloss = 8;
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126 format->Bloss = 8;
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127 format->Aloss = 8;
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128 format->Rshift = 0;
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129 format->Gshift = 0;
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130 format->Bshift = 0;
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131 format->Ashift = 0;
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132 format->Rmask = 0;
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133 format->Gmask = 0;
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134 format->Bmask = 0;
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135 format->Amask = 0;
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136 break;
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137
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138 case 8:
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139 /* Create an empty 256 color palette */
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140 format->palette = (SDL_Palette *)malloc(
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141 sizeof(SDL_Palette));
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142 if ( format->palette == NULL ) {
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143 SDL_FreeFormat(format);
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144 SDL_OutOfMemory();
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145 return(NULL);
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146 }
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147 (format->palette)->ncolors = 256;
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148 (format->palette)->colors = (SDL_Color *)malloc(
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149 (format->palette)->ncolors*sizeof(SDL_Color));
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150 if ( (format->palette)->colors == NULL ) {
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151 SDL_FreeFormat(format);
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152 SDL_OutOfMemory();
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153 return(NULL);
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154 }
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155 memset((format->palette)->colors, 0,
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156 (format->palette)->ncolors*sizeof(SDL_Color));
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157
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158 /* Palettized formats have no mask info */
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159 format->Rloss = 8;
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160 format->Gloss = 8;
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161 format->Bloss = 8;
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162 format->Aloss = 8;
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163 format->Rshift = 0;
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164 format->Gshift = 0;
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165 format->Bshift = 0;
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166 format->Ashift = 0;
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167 format->Rmask = 0;
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168 format->Gmask = 0;
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169 format->Bmask = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
170 format->Amask = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
171 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
172
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
173 default:
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
174 /* No palette, just packed pixel info */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
175 format->palette = NULL;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
176 format->Rshift = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
177 format->Rloss = 8;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
178 if ( Rmask ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
179 for ( mask = Rmask; !(mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
180 ++format->Rshift;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
181 for ( ; (mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
182 --format->Rloss;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
183 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
184 format->Gshift = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
185 format->Gloss = 8;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
186 if ( Gmask ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
187 for ( mask = Gmask; !(mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
188 ++format->Gshift;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
189 for ( ; (mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
190 --format->Gloss;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
191 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
192 format->Bshift = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
193 format->Bloss = 8;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
194 if ( Bmask ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
195 for ( mask = Bmask; !(mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
196 ++format->Bshift;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
197 for ( ; (mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
198 --format->Bloss;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
199 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
200 format->Ashift = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
201 format->Aloss = 8;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
202 if ( Amask ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
203 for ( mask = Amask; !(mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
204 ++format->Ashift;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
205 for ( ; (mask&0x01); mask >>= 1 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
206 --format->Aloss;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
207 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
208 format->Rmask = Rmask;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
209 format->Gmask = Gmask;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
210 format->Bmask = Bmask;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
211 format->Amask = Amask;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
212 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
213 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
214 /* Calculate some standard bitmasks, if necessary
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
215 * Note: This could conflict with an alpha mask, if given.
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
216 */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
217 if ( (bpp > 8) && !format->Rmask && !format->Gmask && !format->Bmask ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
218 /* R-G-B */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
219 if ( bpp > 24 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
220 bpp = 24;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
221 format->Rloss = 8-(bpp/3);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
222 format->Gloss = 8-(bpp/3)-(bpp%3);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
223 format->Bloss = 8-(bpp/3);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
224 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
225 format->Gshift = (bpp/3);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
226 format->Bshift = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
227 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
228 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
229 format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
230 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
231 return(format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
232 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
233 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
234 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
235 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
236 if ( surface->format ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 SDL_FreeFormat(surface->format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238 SDL_FormatChanged(surface);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 return surface->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244 /*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245 * Change any previous mappings from/to the new surface format
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
247 void SDL_FormatChanged(SDL_Surface *surface)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
248 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
249 surface->format_version++;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
250 SDL_InvalidateMap(surface->map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
251 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
252 /*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
253 * Free a previously allocated format structure
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
254 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 void SDL_FreeFormat(SDL_PixelFormat *format)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 if ( format ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
258 if ( format->palette ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 if ( format->palette->colors ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 free(format->palette->colors);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 free(format->palette);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264 free(format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 /*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 void SDL_DitherColors(SDL_Color *colors, int bpp)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 if(bpp != 8)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 return; /* only 8bpp supported right now */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 for(i = 0; i < 256; i++) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 int r, g, b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 /* map each bit field to the full [0, 255] interval,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 r = i & 0xe0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 r |= r >> 3 | r >> 6;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 colors[i].r = r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 g = (i << 3) & 0xe0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 g |= g >> 3 | g >> 6;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 colors[i].g = g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 b = i & 0x3;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 b |= b << 2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 b |= b << 4;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 colors[i].b = b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 /*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293 * Calculate the pad-aligned scanline width of a surface
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 Uint16 SDL_CalculatePitch(SDL_Surface *surface)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 Uint16 pitch;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299 /* Surface should be 4-byte aligned for speed */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300 pitch = surface->w*surface->format->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 switch (surface->format->BitsPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 pitch = (pitch+7)/8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 case 4:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 pitch = (pitch+1)/2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 pitch = (pitch + 3) & ~3; /* 4-byte aligning */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 return(pitch);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 /*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 * Match an RGB value to a particular palette index
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 /* Do colorspace distance matching */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 unsigned int smallest;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 unsigned int distance;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 int rd, gd, bd;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 Uint8 pixel=0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
326 smallest = ~0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327 for ( i=0; i<pal->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 rd = pal->colors[i].r - r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
329 gd = pal->colors[i].g - g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330 bd = pal->colors[i].b - b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
331 distance = (rd*rd)+(gd*gd)+(bd*bd);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332 if ( distance < smallest ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
333 pixel = i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
334 if ( distance == 0 ) { /* Perfect match! */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
337 smallest = distance;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
340 return(pixel);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
341 }
74212992fb08 Initial revision
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342
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343 /* Find the opaque pixel value corresponding to an RGB triple */
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344 Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b)
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345 {
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346 if ( format->palette == NULL ) {
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347 return (r >> format->Rloss) << format->Rshift
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348 | (g >> format->Gloss) << format->Gshift
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349 | (b >> format->Bloss) << format->Bshift
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parents:
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350 | format->Amask;
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parents:
diff changeset
351 } else {
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352 return SDL_FindColor(format->palette, r, g, b);
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diff changeset
353 }
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354 }
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diff changeset
355
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parents:
diff changeset
356 /* Find the pixel value corresponding to an RGBA quadruple */
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diff changeset
357 Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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parents:
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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:
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361 | (g >> format->Gloss) << format->Gshift
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parents:
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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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diff changeset
367 }
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diff changeset
368
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diff changeset
369 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt,
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diff changeset
370 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
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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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374 * This makes sure that the result is mapped to the
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375 * interval [0..255], and the maximum value for each
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Sam Lantinga <slouken@lokigames.com>
parents:
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376 * component is 255. This is important to make sure
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parents:
diff changeset
377 * that white is indeed reported as (255, 255, 255),
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
378 * and that opaque alpha is 255.
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parents:
diff changeset
379 * This only works for RGB bit fields at least 4 bit
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380 * wide, which is almost always the case.
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diff changeset
381 */
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
382 unsigned v;
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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 ***
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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 ***
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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
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parents:
diff changeset
389 if(fmt->Amask) {
628
e561e8752d33 *** empty log message ***
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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
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parents: 688
diff changeset
392 } else {
0
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393 *a = SDL_ALPHA_OPAQUE;
695
8f579a0e17e6 Whitespace
Sam Lantinga <slouken@libsdl.org>
parents: 688
diff changeset
394 }
0
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parents:
diff changeset
395 } else {
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parents:
diff changeset
396 *r = fmt->palette->colors[pixel].r;
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parents:
diff changeset
397 *g = fmt->palette->colors[pixel].g;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398 *b = fmt->palette->colors[pixel].b;
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parents:
diff changeset
399 *a = SDL_ALPHA_OPAQUE;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 if ( fmt->palette == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 /* the note for SDL_GetRGBA above applies here too */
628
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
407 unsigned v;
e561e8752d33 *** empty log message ***
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parents: 297
diff changeset
408 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
409 *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
410 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
411 *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
628
e561e8752d33 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
412 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
413 *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
0
74212992fb08 Initial revision
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parents:
diff changeset
414 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 *r = fmt->palette->colors[pixel].r;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 *g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 *b = fmt->palette->colors[pixel].b;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 /* Apply gamma to a set of colors - this is easy. :) */
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parents:
diff changeset
422 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output,
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 int ncolors)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 for ( i=0; i<ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 output[i].r = gamma[0*256 + colors[i].r] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 output[i].g = gamma[1*256 + colors[i].g] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 output[i].b = gamma[2*256 + colors[i].b] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 }
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 /* Map from Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 if ( identical ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 if ( src->ncolors <= dst->ncolors ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 /* If an identical palette, no need to map */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 if ( memcmp(src->colors, dst->colors, src->ncolors*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 sizeof(SDL_Color)) == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 *identical = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 *identical = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 map = (Uint8 *)malloc(src->ncolors);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 map[i] = SDL_FindColor(dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 src->colors[i].r, src->colors[i].g, src->colors[i].b);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 /* Map from Palette to BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 int bpp;
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
468 unsigned alpha;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 map = (Uint8 *)malloc(src->ncolors*bpp);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
477 alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 /* We memory copy to the pixel map so the endianness is preserved */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 src->colors[i].r, src->colors[i].g,
50
eda2f15ffb70 Oops, back it out...
Sam Lantinga <slouken@lokigames.com>
parents: 48
diff changeset
482 src->colors[i].b, alpha);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 /* Map from BitField to Dithered-Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 /* Generate a 256 color dither palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 SDL_Palette dithered;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 SDL_Color colors[256];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493 dithered.ncolors = 256;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494 SDL_DitherColors(colors, 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 dithered.colors = colors;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 return(Map1to1(&dithered, dst, identical));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 SDL_BlitMap *SDL_AllocBlitMap(void)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 /* Allocate the empty map */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504 map = (SDL_BlitMap *)malloc(sizeof(*map));
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 if ( map == NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 SDL_OutOfMemory();
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 memset(map, 0, sizeof(*map));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511 /* Allocate the software blit data */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 map->sw_data = (struct private_swaccel *)malloc(sizeof(*map->sw_data));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 if ( map->sw_data == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514 SDL_FreeBlitMap(map);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 SDL_OutOfMemory();
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 return(NULL);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 memset(map->sw_data, 0, sizeof(*map->sw_data));
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520 /* It's ready to go */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521 return(map);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 void SDL_InvalidateMap(SDL_BlitMap *map)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
524 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
525 if ( ! map ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526 return;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528 map->dst = NULL;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529 map->format_version = (unsigned int)-1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 if ( map->table ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531 free(map->table);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
532 map->table = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
533 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
534 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
535 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
537 SDL_PixelFormat *srcfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 SDL_PixelFormat *dstfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541 /* Clear out any previous mapping */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
542 map = src->map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
544 SDL_UnRLESurface(src, 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
545 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
546 SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
547
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
548 /* Figure out what kind of mapping we're doing */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
549 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550 srcfmt = src->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551 dstfmt = dst->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552 switch (srcfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
553 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
554 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
555 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
556 /* Palette --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 /* If both SDL_HWSURFACE, assume have same palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
558 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
560 map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
562 map->table = Map1to1(srcfmt->palette,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
563 dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
564 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
565 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
566 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
568 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
570 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
571 map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
572 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
573
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
574 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
575 /* Palette --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
576 map->table = Map1toN(srcfmt->palette, dstfmt);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
577 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
578 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
579 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
582 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
583 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
584 switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586 /* BitField --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
587 map->table = MapNto1(srcfmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
588 dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589 if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
590 if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
594 map->identity = 0; /* Don't optimize to copy */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597 /* BitField --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
598 if ( FORMAT_EQUAL(srcfmt, dstfmt) )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599 map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
600 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
602 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
603 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
604
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 map->dst = dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
606 map->format_version = dst->format_version;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
608 /* Choose your blitters wisely */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609 return(SDL_CalculateBlit(src));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611 void SDL_FreeBlitMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
612 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613 if ( map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614 SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
615 if ( map->sw_data != NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
616 free(map->sw_data);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
617 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
618 free(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
619 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
620 }