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annotate src/video/x11/SDL_x11gamma.c @ 3604:e569bbb266eb

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Fixed bug #915 GNU-isms should be avoided wherever possible for portability, please avoid the use of GNU-isms in your code, this may be problematic when using this library in projects which use non-GNU-compliant compilers.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 30 Dec 2009 19:38:08 +0000
parents 4b594623401b
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
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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 /* The size of *all* SDL gamma ramps */
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27 #define SDL_GammaRampSize (3 * 256 * sizeof(Uint16))
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28
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29 static int numCmaps = 0;
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30
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31 typedef struct
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32 {
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33 Display *display;
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34 int scrNum;
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35 Colormap colormap;
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36 Visual visual;
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37 Uint16 *ramp;
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38 } cmapTableEntry;
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39
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40 cmapTableEntry *cmapTable = NULL;
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41
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42 /* To reduce the overhead as much as possible lets do as little as
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43 possible. When we do have to create a colormap keep track of it and
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44 reuse it. We're going to do this for both DirectColor and
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45 PseudoColor colormaps. */
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46
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47 Colormap
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48 X11_LookupColormap(Display * display, int scrNum, VisualID vid)
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49 {
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50 int i;
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51
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52 for (i = 0; i < numCmaps; i++) {
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53 if (cmapTable[i].display == display &&
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54 cmapTable[i].scrNum == scrNum &&
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55 cmapTable[i].visual.visualid == vid) {
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56 return cmapTable[i].colormap;
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57 }
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58 }
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59
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60 return 0;
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61 }
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62
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63
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64 void
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65 X11_TrackColormap(Display * display, int scrNum, Colormap colormap,
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66 Visual * visual, XColor * ramp)
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67 {
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68 int i;
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69 Uint16 *newramp;
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70 int ncolors;
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71
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72 /* search the table to find out if we already have this one. We
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73 only want one entry for each display, screen number, visualid,
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74 and colormap combination */
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75 for (i = 0; i < numCmaps; i++) {
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76 if (cmapTable[i].display == display &&
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77 cmapTable[i].scrNum == scrNum &&
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78 cmapTable[i].visual.visualid == visual->visualid &&
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79 cmapTable[i].colormap == colormap) {
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80 return;
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81 }
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82 }
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83
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84 /* increase the table by one entry. If the table is NULL create the
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85 first entrty */
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86 cmapTable =
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87 SDL_realloc(cmapTable, (numCmaps + 1) * sizeof(cmapTableEntry));
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88 if (NULL == cmapTable) {
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89 SDL_SetError("Out of memory in X11_TrackColormap()");
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90 return;
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91 }
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92
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93 cmapTable[numCmaps].display = display;
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94 cmapTable[numCmaps].scrNum = scrNum;
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95 cmapTable[numCmaps].colormap = colormap;
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96 SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual));
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97 cmapTable[numCmaps].ramp = NULL;
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98
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99 if (ramp != NULL) {
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100 newramp = SDL_malloc(SDL_GammaRampSize);
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101 if (NULL == newramp) {
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102 SDL_SetError("Out of memory in X11_TrackColormap()");
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103 return;
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104 }
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105 SDL_memset(newramp, 0, SDL_GammaRampSize);
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106 cmapTable[numCmaps].ramp = newramp;
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107
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108 ncolors = cmapTable[numCmaps].visual.map_entries;
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109
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110 for (i = 0; i < ncolors; i++) {
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111 newramp[(0 * 256) + i] = ramp[i].red;
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112 newramp[(1 * 256) + i] = ramp[i].green;
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113 newramp[(2 * 256) + i] = ramp[i].blue;
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114 }
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115 }
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116
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117 numCmaps++;
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118 }
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119
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120 /* The problem is that you have to have at least one DirectColor
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121 colormap before you can set the gamma ramps or read the gamma
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122 ramps. If the application has created a DirectColor window then the
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123 cmapTable will have at least one colormap in it and everything is
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124 cool. If not, then we just fail */
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125
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126 int
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127 X11_SetDisplayGammaRamp(_THIS, SDL_VideoDisplay * sdl_display, Uint16 * ramp)
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128 {
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129 Visual *visual;
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130 Display *display;
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131 Colormap colormap;
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132 XColor *colorcells;
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133 int ncolors;
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134 int rmask, gmask, bmask;
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135 int rshift, gshift, bshift;
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136 int i;
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137 int j;
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138
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139 for (j = 0; j < numCmaps; j++) {
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140 if (cmapTable[j].visual.class == DirectColor) {
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141 display = cmapTable[j].display;
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
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142 colormap = cmapTable[j].colormap;
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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143 ncolors = cmapTable[j].visual.map_entries;
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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144 visual = &cmapTable[j].visual;
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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145
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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146 colorcells = SDL_malloc(ncolors * sizeof(XColor));
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
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diff changeset
147 if (NULL == colorcells) {
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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148 SDL_SetError("out of memory in X11_SetDisplayGammaRamp");
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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149 return -1;
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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150 }
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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151 /* remember the new ramp */
3052
Sam Lantinga <slouken@libsdl.org>
parents: 3044
diff changeset
152 if (cmapTable[j].ramp == NULL) {
Sam Lantinga <slouken@libsdl.org>
parents: 3044
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153 Uint16 *newramp = SDL_malloc(SDL_GammaRampSize);
Sam Lantinga <slouken@libsdl.org>
parents: 3044
diff changeset
154 if (NULL == newramp) {
Sam Lantinga <slouken@libsdl.org>
parents: 3044
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155 SDL_SetError("Out of memory in X11_TrackColormap()");
Sam Lantinga <slouken@libsdl.org>
parents: 3044
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156 return -1;
Sam Lantinga <slouken@libsdl.org>
parents: 3044
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157 }
Sam Lantinga <slouken@libsdl.org>
parents: 3044
diff changeset
158 cmapTable[j].ramp = newramp;
Sam Lantinga <slouken@libsdl.org>
parents: 3044
diff changeset
159 }
3044
b36579172f27 Changes to hopefully handle the creation of a colormap for 8 bit PseudoColor visuals in X11
Bob Pendleton <bob@pendleton.com>
parents: 3010
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160 SDL_memcpy(cmapTable[j].ramp, ramp, SDL_GammaRampSize);
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
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161
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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162 rshift = 0;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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diff changeset
163 rmask = visual->red_mask;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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164 while (0 == (rmask & 1)) {
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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165 rshift++;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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166 rmask >>= 1;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
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167 }
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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diff changeset
168
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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169 /* printf("rmask = %4x rshift = %4d\n", rmask, rshift); */
2214
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170
3010
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171 gshift = 0;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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172 gmask = visual->green_mask;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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diff changeset
173 while (0 == (gmask & 1)) {
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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diff changeset
174 gshift++;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
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diff changeset
175 gmask >>= 1;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
176 }
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
177
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
178 /* printf("gmask = %4x gshift = %4d\n", gmask, gshift); */
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
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parents: 2859
diff changeset
179
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
180 bshift = 0;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
181 bmask = visual->blue_mask;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
182 while (0 == (bmask & 1)) {
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
183 bshift++;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
184 bmask >>= 1;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
185 }
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
186
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
187 /* printf("bmask = %4x bshift = %4d\n", bmask, bshift); */
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
188
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
189 /* build the color table pixel values */
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
190 for (i = 0; i < ncolors; i++) {
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
191 Uint32 rbits = (rmask * i) / (ncolors - 1);
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
192 Uint32 gbits = (gmask * i) / (ncolors - 1);
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
193 Uint32 bbits = (bmask * i) / (ncolors - 1);
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
194
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
195 Uint32 pix =
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
196 (rbits << rshift) | (gbits << gshift) | (bbits << bshift);
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
197
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
198 colorcells[i].pixel = pix;
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
199
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
200 colorcells[i].flags = DoRed | DoGreen | DoBlue;
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
201
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
202 colorcells[i].red = ramp[(0 * 256) + i];
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
203 colorcells[i].green = ramp[(1 * 256) + i];
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
204 colorcells[i].blue = ramp[(2 * 256) + i];
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
205 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
206
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
207 XStoreColors(display, colormap, colorcells, ncolors);
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
208 XFlush(display);
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
209 SDL_free(colorcells);
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
210 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
211 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
212
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
213 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
214 }
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
215
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
216 int
3500
4b594623401b Work in progress on multi-display support:
Sam Lantinga <slouken@libsdl.org>
parents: 3052
diff changeset
217 X11_GetDisplayGammaRamp(_THIS, SDL_VideoDisplay * display, Uint16 * ramp)
2162
1d23870d8c49 Added stubs for x11 gamma functions and enabled them in SDL_x11video.c
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
218 {
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
219 int i;
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
220
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
221 /* find the first DirectColor colormap and use it to get the gamma
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
222 ramp */
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
223
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
224 for (i = 0; i < numCmaps; i++) {
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
225 if (cmapTable[i].visual.class == DirectColor) {
3044
b36579172f27 Changes to hopefully handle the creation of a colormap for 8 bit PseudoColor visuals in X11
Bob Pendleton <bob@pendleton.com>
parents: 3010
diff changeset
226 SDL_memcpy(ramp, cmapTable[i].ramp, SDL_GammaRampSize);
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
227 return 0;
2214
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
228 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
229 }
e7164a4dac62 Added gamma table support to X11. Also now supports DirectColor visuals.
Bob Pendleton <bob@pendleton.com>
parents: 2213
diff changeset
230
3010
a6694a812119 Modified and totally untested code to load the color tables for DirectColor and PseudoColor windows.
Bob Pendleton <bob@pendleton.com>
parents: 2859
diff changeset
231 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
232 }