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annotate src/video/x11/SDL_x11gamma.c @ 2993:2fad80c77c17

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Technically more correct
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2009 19:26:50 +0000
parents 99210400e8b9
children a6694a812119
rev   line source
2162
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23 #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
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67 /* search the table to find out if we already have this one. We
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68 only want one entry for each display, screen number, visualid,
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69 and colormap combination */
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70 for (i = 0; i < numCmaps; i++) {
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71 if (cmapTable[i].display == display &&
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72 cmapTable[i].scrNum == scrNum &&
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73 cmapTable[i].cmap.visualid == cmap->visualid &&
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74 cmapTable[i].cmap.colormap == colormap) {
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75 return;
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76 }
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77 }
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78
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79 /* increase the table by one entry. If the table is NULL create the
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80 first entrty */
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81 cmapTable =
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82 SDL_realloc(cmapTable, (numCmaps + 1) * sizeof(cmapTableEntry));
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83 if (NULL == cmapTable) {
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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 cmapTable[numCmaps].display = display;
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89 cmapTable[numCmaps].scrNum = scrNum;
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90 cmapTable[numCmaps].colormap = colormap;
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91 SDL_memcpy(&cmapTable[numCmaps].cmap, cmap, sizeof(XStandardColormap));
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92 SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual));
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93
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94 numCmaps++;
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95 }
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96
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97 /* The problem is that you have to have at least one DirectColor
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98 colormap before you can set the gamma ramps or read the gamma
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99 ramps. If the application has created a DirectColor window then the
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100 cmapTable will have at least one colormap in it and everything is
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101 cool. If not, then we just fail */
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102
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103 int
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104 X11_SetDisplayGammaRamp(_THIS, Uint16 * ramp)
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105 {
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106 Display *display;
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107 Colormap colormap;
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108 XColor *colorcells;
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109 int ncolors;
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110 int i;
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111 int j;
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112
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113 int rmax, gmax, bmax;
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114 int rmul, gmul, bmul;
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115
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116 for (j = 0; j < numCmaps; j++) {
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117 if (cmapTable[j].visual.class == DirectColor) {
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118 display = cmapTable[j].display;
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119 colormap = cmapTable[j].colormap;
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120 ncolors = cmapTable[j].visual.map_entries;
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121
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122 colorcells = SDL_malloc(ncolors * sizeof(XColor));
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123 if (NULL == colorcells) {
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124 SDL_SetError("out of memory in X11_SetDisplayGammaRamp");
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125 return -1;
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126 }
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127
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128 rmax = cmapTable[j].cmap.red_max + 1;
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129 gmax = cmapTable[j].cmap.blue_max + 1;
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130 bmax = cmapTable[j].cmap.green_max + 1;
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131
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132 rmul = cmapTable[j].cmap.red_mult;
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133 gmul = cmapTable[j].cmap.blue_mult;
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134 bmul = cmapTable[j].cmap.green_mult;
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135
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136 /* build the color table pixel values */
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137 for (i = 0; i < ncolors; i++) {
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138 Uint32 red = (rmax * i) / ncolors;
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139 Uint32 green = (gmax * i) / ncolors;
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140 Uint32 blue = (bmax * i) / ncolors;
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141
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142 colorcells[i].pixel =
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143 (red * rmul) | (green * gmul) | (blue * bmul);
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144 colorcells[i].flags = DoRed | DoGreen | DoBlue;
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145
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146 colorcells[i].red = ramp[(0 * 256) + i];
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147 colorcells[i].green = ramp[(1 * 256) + i];
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148 colorcells[i].blue = ramp[(2 * 256) + i];
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149 }
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150
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151 XStoreColors(display, colormap, colorcells, ncolors);
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152 XFlush(display);
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153 SDL_free(colorcells);
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154 }
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155 }
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156
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157 return 0;
2162
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158 }
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159
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160 int
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161 X11_GetDisplayGammaRamp(_THIS, Uint16 * ramp)
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162 {
2214
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163 Display *display;
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164 Colormap colormap;
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165 XColor *colorcells;
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166 int ncolors;
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167 int dc;
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168 int i;
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169
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170 int rmax, gmax, bmax;
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171 int rmul, gmul, bmul;
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172
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173 /* find the first DirectColor colormap and use it to get the gamma
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174 ramp */
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175
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176 dc = -1;
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177 for (i = 0; i < numCmaps; i++) {
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178 if (cmapTable[i].visual.class == DirectColor) {
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179 dc = i;
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180 break;
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181 }
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182 }
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183
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184 if (dc < 0) {
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185 return -1;
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186 }
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187
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188 /* there is at least one DirectColor colormap in the cmapTable,
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189 let's just get the entries from that colormap */
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190
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191 display = cmapTable[dc].display;
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192 colormap = cmapTable[dc].colormap;
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193 ncolors = cmapTable[dc].visual.map_entries;
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194 colorcells = SDL_malloc(ncolors * sizeof(XColor));
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195 if (NULL == colorcells) {
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196 SDL_SetError("out of memory in X11_GetDisplayGammaRamp");
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197 return -1;
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198 }
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199
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200 rmax = cmapTable[dc].cmap.red_max + 1;
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201 gmax = cmapTable[dc].cmap.blue_max + 1;
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202 bmax = cmapTable[dc].cmap.green_max + 1;
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203
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204 rmul = cmapTable[dc].cmap.red_mult;
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205 gmul = cmapTable[dc].cmap.blue_mult;
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206 bmul = cmapTable[dc].cmap.green_mult;
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207
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208 /* build the color table pixel values */
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209 for (i = 0; i < ncolors; i++) {
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210 Uint32 red = (rmax * i) / ncolors;
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211 Uint32 green = (gmax * i) / ncolors;
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212 Uint32 blue = (bmax * i) / ncolors;
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213
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214 colorcells[i].pixel = (red * rmul) | (green * gmul) | (blue * bmul);
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215 }
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216
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217 XQueryColors(display, colormap, colorcells, ncolors);
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218
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219 /* prepare the values to be returned. Note that SDL assumes that
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220 gamma ramps are always 3 * 256 entries long with the red entries
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221 in the first 256 elements, the green in the second 256 elements
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222 and the blue in the last 256 elements */
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223
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224 for (i = 0; i < ncolors; i++) {
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225 ramp[(0 * 256) + i] = colorcells[i].red;
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226 ramp[(1 * 256) + i] = colorcells[i].green;
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227 ramp[(2 * 256) + i] = colorcells[i].blue;
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228 }
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229
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230 SDL_free(colorcells);
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231 return 0;
2162
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diff changeset
232 }