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annotate src/video/x11/SDL_x11gamma.c @ 2214:e7164a4dac62

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Added gamma table support to X11. Also now supports DirectColor visuals.
author Bob Pendleton <bob@pendleton.com>
date Wed, 25 Jul 2007 21:22:55 +0000
parents 59a667370c57
children 82a133b784c9
rev   line source
2162
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
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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
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23 #include "../SDL_sysvideo.h"
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24 #include "SDL_x11video.h"
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25
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26 static int numCmaps = 0;
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27
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28 typedef struct
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29 {
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30 Display *display;
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31 int scrNum;
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32 Colormap colormap;
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33 XStandardColormap cmap;
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34 Visual visual;
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35 } cmapTableEntry;
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36
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37 cmapTableEntry *cmapTable = NULL;
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38
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39 /* To reduce the overhead as much as possible lets do as little as
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40 possible. When we do have to create a colormap keep track of it and
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41 reuse it. We're going to do this for both DirectColor and
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42 PseudoColor colormaps. */
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43
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44 Colormap
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45 X11_LookupColormap(Display * display, int scrNum, VisualID vid)
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46 {
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47 int i;
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48
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49 for (i = 0; i < numCmaps; i++) {
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50 if (cmapTable[i].display == display &&
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51 cmapTable[i].scrNum == scrNum &&
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52 cmapTable[i].cmap.visualid == vid) {
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53 return cmapTable[i].cmap.colormap;
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54 }
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55 }
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56
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57 return 0;
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58 }
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59
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60
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61 void
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62 X11_TrackColormap(Display * display, int scrNum, Colormap colormap,
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63 XStandardColormap * cmap, Visual * visual)
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64 {
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65 int i;
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66 cmapTableEntry *newTable = NULL;
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67
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68 /* search the table to find out if we already have this one. We
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69 only want one entry for each display, screen number, visualid,
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70 and colormap combination */
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71 for (i = 0; i < numCmaps; i++) {
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72 if (cmapTable[i].display == display &&
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73 cmapTable[i].scrNum == scrNum &&
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74 cmapTable[i].cmap.visualid == cmap->visualid &&
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75 cmapTable[i].cmap.colormap == colormap) {
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76 return;
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77 }
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78 }
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79
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80 /* increase the table by one entry. If the table is NULL create the
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81 first entrty */
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82 newTable = SDL_malloc((numCmaps + 1) * sizeof(cmapTableEntry));
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83 if (NULL == newTable) {
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84 SDL_SetError("Out of memory in X11_TrackColormap()");
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85 return;
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86 }
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87
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88 if (NULL != cmapTable) {
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89 SDL_memcpy(newTable, cmapTable, numCmaps * sizeof(cmapTableEntry));
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90 SDL_free(cmapTable);
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91 }
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92 cmapTable = newTable;
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93
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94 cmapTable[numCmaps].display = display;
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95 cmapTable[numCmaps].scrNum = scrNum;
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96 cmapTable[numCmaps].colormap = colormap;
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97 SDL_memcpy(&cmapTable[numCmaps].cmap, cmap, sizeof(XStandardColormap));
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98 SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual));
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99
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100 numCmaps++;
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101 }
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102
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103 /* The problem is that you have to have at least one DirectColor
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104 colormap before you can set the gamma ramps or read the gamma
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105 ramps. If the application has created a DirectColor window then the
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106 cmapTable will have at least one colormap in it and everything is
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107 cool. If not, then we just fail */
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108
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109 int
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110 X11_SetDisplayGammaRamp(_THIS, Uint16 * ramp)
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111 {
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112 Display *display;
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113 Colormap colormap;
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114 XColor *colorcells;
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115 int ncolors;
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116 int i;
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117 int j;
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118
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119 int rmax, gmax, bmax;
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120 int rmul, gmul, bmul;
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121
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122 for (j = 0; j < numCmaps; j++) {
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123 if (cmapTable[j].visual.class == DirectColor) {
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124 display = cmapTable[j].display;
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125 colormap = cmapTable[j].colormap;
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126 ncolors = cmapTable[j].visual.map_entries;
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127
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128 colorcells = SDL_malloc(ncolors * sizeof(XColor));
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129 if (NULL == colorcells) {
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130 SDL_SetError("out of memory in X11_SetDisplayGammaRamp");
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131 return -1;
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132 }
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133
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134 rmax = cmapTable[j].cmap.red_max + 1;
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135 gmax = cmapTable[j].cmap.blue_max + 1;
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136 bmax = cmapTable[j].cmap.green_max + 1;
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137
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138 rmul = cmapTable[j].cmap.red_mult;
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139 gmul = cmapTable[j].cmap.blue_mult;
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140 bmul = cmapTable[j].cmap.green_mult;
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141
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142 /* build the color table pixel values */
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143 for (i = 0; i < ncolors; i++) {
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144 Uint32 red = (rmax * i) / ncolors;
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145 Uint32 green = (gmax * i) / ncolors;
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146 Uint32 blue = (bmax * i) / ncolors;
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147
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148 colorcells[i].pixel =
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149 (red * rmul) | (green * gmul) | (blue * bmul);
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150 colorcells[i].flags = DoRed | DoGreen | DoBlue;
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151
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152 colorcells[i].red = ramp[(0 * 256) + i];
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153 colorcells[i].green = ramp[(1 * 256) + i];
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154 colorcells[i].blue = ramp[(2 * 256) + i];
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155 }
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156
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157 XStoreColors(display, colormap, colorcells, ncolors);
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158 XFlush(display);
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159 SDL_free(colorcells);
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160 }
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161 }
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162
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163 return 0;
2162
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164 }
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165
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166 int
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167 X11_GetDisplayGammaRamp(_THIS, Uint16 * ramp)
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168 {
2214
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169 Display *display;
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170 Colormap colormap;
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171 XColor *colorcells;
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172 int ncolors;
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173 int dc;
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174 int i;
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175
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176 int rmax, gmax, bmax;
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177 int rmul, gmul, bmul;
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178
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179 /* find the first DirectColor colormap and use it to get the gamma
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180 ramp */
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181
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182 dc = -1;
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183 for (i = 0; i < numCmaps; i++) {
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184 if (cmapTable[i].visual.class == DirectColor) {
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185 dc = i;
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186 break;
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187 }
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188 }
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189
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190 if (dc < 0) {
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191 return -1;
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192 }
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193
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194 /* there is at least one DirectColor colormap in the cmapTable,
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195 let's just get the entries from that colormap */
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196
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197 display = cmapTable[dc].display;
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198 colormap = cmapTable[dc].colormap;
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199 ncolors = cmapTable[dc].visual.map_entries;
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200 colorcells = SDL_malloc(ncolors * sizeof(XColor));
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201 if (NULL == colorcells) {
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202 SDL_SetError("out of memory in X11_GetDisplayGammaRamp");
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203 return -1;
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204 }
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205
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206 rmax = cmapTable[dc].cmap.red_max + 1;
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207 gmax = cmapTable[dc].cmap.blue_max + 1;
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208 bmax = cmapTable[dc].cmap.green_max + 1;
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209
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210 rmul = cmapTable[dc].cmap.red_mult;
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211 gmul = cmapTable[dc].cmap.blue_mult;
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212 bmul = cmapTable[dc].cmap.green_mult;
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213
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214 /* build the color table pixel values */
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215 for (i = 0; i < ncolors; i++) {
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216 Uint32 red = (rmax * i) / ncolors;
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217 Uint32 green = (gmax * i) / ncolors;
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218 Uint32 blue = (bmax * i) / ncolors;
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219
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220 colorcells[i].pixel = (red * rmul) | (green * gmul) | (blue * bmul);
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221 }
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222
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223 XQueryColors(display, colormap, colorcells, ncolors);
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224
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225 /* prepare the values to be returned. Note that SDL assumes that
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226 gamma ramps are always 3 * 256 entries long with the red entries
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227 in the first 256 elements, the green in the second 256 elements
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228 and the blue in the last 256 elements */
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229
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230 for (i = 0; i < ncolors; i++) {
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231 ramp[(0 * 256) + i] = colorcells[i].red;
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232 ramp[(1 * 256) + i] = colorcells[i].green;
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233 ramp[(2 * 256) + i] = colorcells[i].blue;
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234 }
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235
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236 SDL_free(colorcells);
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237 return 0;
2162
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238 }