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annotate src/video/x11/SDL_x11gamma.c @ 3010:a6694a812119

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Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
author Bob Pendleton <bob@pendleton.com>
date Fri, 09 Jan 2009 20:41:31 +0000
parents 99210400e8b9
children b36579172f27
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
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
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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 Visual visual;
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34 Uint16 *ramp;
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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].visual.visualid == vid) {
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53 return cmapTable[i].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 Visual * visual, XColor * ramp)
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64 {
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65 int i;
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66 Uint16 *newramp;
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67 int ncolors;
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68
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69 /* search the table to find out if we already have this one. We
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70 only want one entry for each display, screen number, visualid,
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71 and colormap combination */
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72 for (i = 0; i < numCmaps; i++) {
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73 if (cmapTable[i].display == display &&
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74 cmapTable[i].scrNum == scrNum &&
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75 cmapTable[i].visual.visualid == visual->visualid &&
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76 cmapTable[i].colormap == colormap) {
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77 return;
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78 }
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79 }
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80
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81 /* increase the table by one entry. If the table is NULL create the
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82 first entrty */
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83 cmapTable =
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84 SDL_realloc(cmapTable, (numCmaps + 1) * sizeof(cmapTableEntry));
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85 if (NULL == cmapTable) {
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86 SDL_SetError("Out of memory in X11_TrackColormap()");
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87 return;
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88 }
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89
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90 cmapTable[numCmaps].display = display;
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91 cmapTable[numCmaps].scrNum = scrNum;
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92 cmapTable[numCmaps].colormap = colormap;
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93 SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual));
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94 cmapTable[numCmaps].ramp = NULL;
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95
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96 newramp = SDL_malloc(3 * 256 * sizeof(Uint16)); /* The size of *all* SDL gamma ramps */
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97 if (NULL == newramp) {
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98 SDL_SetError("Out of memory in X11_TrackColormap()");
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99 return;
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100 }
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101 SDL_memset(newramp, 0, sizeof(*newramp));
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102 cmapTable[numCmaps].ramp = newramp;
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103
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104 ncolors = cmapTable[numCmaps].visual.map_entries;
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105
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106 for (i = 0; i < ncolors; i++) {
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107 newramp[(0 * 256) + i] = ramp[i].red;
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108 newramp[(1 * 256) + i] = ramp[i].green;
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109 newramp[(2 * 256) + i] = ramp[i].blue;
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110 }
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111
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112 numCmaps++;
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113 }
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114
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115 /* The problem is that you have to have at least one DirectColor
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116 colormap before you can set the gamma ramps or read the gamma
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117 ramps. If the application has created a DirectColor window then the
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118 cmapTable will have at least one colormap in it and everything is
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119 cool. If not, then we just fail */
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120
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121 int
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122 X11_SetDisplayGammaRamp(_THIS, Uint16 * ramp)
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123 {
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124 Visual *visual;
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125 Display *display;
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126 Colormap colormap;
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127 XColor *colorcells;
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128 int ncolors;
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129 int rmask, gmask, bmask;
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130 int rshift, gshift, bshift;
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131 int i;
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132 int j;
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133
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134 for (j = 0; j < numCmaps; j++) {
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135 if (cmapTable[j].visual.class == DirectColor) {
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136 display = cmapTable[j].display;
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137 colormap = cmapTable[j].colormap;
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138 ncolors = cmapTable[j].visual.map_entries;
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a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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139 visual = &cmapTable[j].visual;
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140
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141 colorcells = SDL_malloc(ncolors * sizeof(XColor));
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142 if (NULL == colorcells) {
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143 SDL_SetError("out of memory in X11_SetDisplayGammaRamp");
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144 return -1;
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145 }
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146 /* remember the new ramp */
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147 SDL_memcpy(cmapTable[j].ramp, ramp, sizeof(*cmapTable[j].ramp));
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148
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149 rshift = 0;
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150 rmask = visual->red_mask;
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151 while (0 == (rmask & 1)) {
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152 rshift++;
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153 rmask >>= 1;
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154 }
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155
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156 /* printf("rmask = %4x rshift = %4d\n", rmask, rshift); */
2214
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157
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158 gshift = 0;
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159 gmask = visual->green_mask;
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160 while (0 == (gmask & 1)) {
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161 gshift++;
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162 gmask >>= 1;
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163 }
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164
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165 /* printf("gmask = %4x gshift = %4d\n", gmask, gshift); */
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166
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167 bshift = 0;
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168 bmask = visual->blue_mask;
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169 while (0 == (bmask & 1)) {
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170 bshift++;
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171 bmask >>= 1;
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172 }
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173
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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174 /* printf("bmask = %4x bshift = %4d\n", bmask, bshift); */
2214
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175
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176 /* build the color table pixel values */
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177 for (i = 0; i < ncolors; i++) {
3010
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178 Uint32 rbits = (rmask * i) / (ncolors - 1);
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179 Uint32 gbits = (gmask * i) / (ncolors - 1);
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180 Uint32 bbits = (bmask * i) / (ncolors - 1);
2214
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181
3010
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182 Uint32 pix =
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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183 (rbits << rshift) | (gbits << gshift) | (bbits << bshift);
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184
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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185 colorcells[i].pixel = pix;
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186
2214
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187 colorcells[i].flags = DoRed | DoGreen | DoBlue;
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188
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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189 colorcells[i].red = ramp[(0 * 256) + i];
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190 colorcells[i].green = ramp[(1 * 256) + i];
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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191 colorcells[i].blue = ramp[(2 * 256) + i];
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192 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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193
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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194 XStoreColors(display, colormap, colorcells, ncolors);
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195 XFlush(display);
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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196 SDL_free(colorcells);
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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197 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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198 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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199
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
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200 return 0;
2162
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
201 }
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
Bob Pendleton <bob@pendleton.com>
parents:
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202
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
203 int
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
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204 X11_GetDisplayGammaRamp(_THIS, Uint16 * ramp)
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
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parents:
diff changeset
205 {
2214
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diff changeset
206 int i;
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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207
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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208 /* find the first DirectColor colormap and use it to get the gamma
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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diff changeset
209 ramp */
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
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diff changeset
210
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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diff changeset
211 for (i = 0; i < numCmaps; i++) {
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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diff changeset
212 if (cmapTable[i].visual.class == DirectColor) {
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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diff changeset
213 SDL_memcpy(ramp, cmapTable[i].ramp, sizeof(*cmapTable[i].ramp));
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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diff changeset
214 return 0;
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
215 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
216 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
217
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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diff changeset
218 return -1;
2162
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
219 }