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comparison src/video/x11/SDL_x11gamma.c @ 3044:b36579172f27

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Changes to hopefully handle the creation of a colormap for 8 bit PseudoColor visuals in X11
author Bob Pendleton <bob@pendleton.com>
date Thu, 15 Jan 2009 21:35:42 +0000
parents a6694a812119
children b7197d7e8566
comparison
equal deleted inserted replaced
3043:9a20287aaed1 3044:b36579172f27
20 slouken@libsdl.org 20 slouken@libsdl.org
21 */ 21 */
22 #include "SDL_config.h" 22 #include "SDL_config.h"
23 #include "../SDL_sysvideo.h" 23 #include "../SDL_sysvideo.h"
24 #include "SDL_x11video.h" 24 #include "SDL_x11video.h"
25
26 /* The size of *all* SDL gamma ramps */
27 #define SDL_GammaRampSize (3 * 256 * sizeof(Uint16))
25 28
26 static int numCmaps = 0; 29 static int numCmaps = 0;
27 30
28 typedef struct 31 typedef struct
29 { 32 {
91 cmapTable[numCmaps].scrNum = scrNum; 94 cmapTable[numCmaps].scrNum = scrNum;
92 cmapTable[numCmaps].colormap = colormap; 95 cmapTable[numCmaps].colormap = colormap;
93 SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual)); 96 SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual));
94 cmapTable[numCmaps].ramp = NULL; 97 cmapTable[numCmaps].ramp = NULL;
95 98
96 newramp = SDL_malloc(3 * 256 * sizeof(Uint16)); /* The size of *all* SDL gamma ramps */ 99 if (ramp != NULL) {
97 if (NULL == newramp) { 100 newramp = SDL_malloc(SDL_GammaRampSize);
101 if (NULL == newramp) {
98 SDL_SetError("Out of memory in X11_TrackColormap()"); 102 SDL_SetError("Out of memory in X11_TrackColormap()");
99 return; 103 return;
100 } 104 }
101 SDL_memset(newramp, 0, sizeof(*newramp)); 105 SDL_memset(newramp, 0, SDL_GammaRampSize);
102 cmapTable[numCmaps].ramp = newramp; 106 cmapTable[numCmaps].ramp = newramp;
103 107
104 ncolors = cmapTable[numCmaps].visual.map_entries; 108 ncolors = cmapTable[numCmaps].visual.map_entries;
105 109
106 for (i = 0; i < ncolors; i++) { 110 for (i = 0; i < ncolors; i++) {
107 newramp[(0 * 256) + i] = ramp[i].red; 111 newramp[(0 * 256) + i] = ramp[i].red;
108 newramp[(1 * 256) + i] = ramp[i].green; 112 newramp[(1 * 256) + i] = ramp[i].green;
109 newramp[(2 * 256) + i] = ramp[i].blue; 113 newramp[(2 * 256) + i] = ramp[i].blue;
114 }
110 } 115 }
111 116
112 numCmaps++; 117 numCmaps++;
113 } 118 }
114 119
142 if (NULL == colorcells) { 147 if (NULL == colorcells) {
143 SDL_SetError("out of memory in X11_SetDisplayGammaRamp"); 148 SDL_SetError("out of memory in X11_SetDisplayGammaRamp");
144 return -1; 149 return -1;
145 } 150 }
146 /* remember the new ramp */ 151 /* remember the new ramp */
147 SDL_memcpy(cmapTable[j].ramp, ramp, sizeof(*cmapTable[j].ramp)); 152 if (cmapTable[j].ramp == NULL) {
153 Uint16 * newramp = SDL_malloc(SDL_GammaRampSize);
154 if (NULL == newramp) {
155 SDL_SetError("Out of memory in X11_TrackColormap()");
156 return -1;
157 }
158 cmapTable[j].ramp = newramp;
159 }
160 SDL_memcpy(cmapTable[j].ramp, ramp, SDL_GammaRampSize);
148 161
149 rshift = 0; 162 rshift = 0;
150 rmask = visual->red_mask; 163 rmask = visual->red_mask;
151 while (0 == (rmask & 1)) { 164 while (0 == (rmask & 1)) {
152 rshift++; 165 rshift++;
208 /* find the first DirectColor colormap and use it to get the gamma 221 /* find the first DirectColor colormap and use it to get the gamma
209 ramp */ 222 ramp */
210 223
211 for (i = 0; i < numCmaps; i++) { 224 for (i = 0; i < numCmaps; i++) {
212 if (cmapTable[i].visual.class == DirectColor) { 225 if (cmapTable[i].visual.class == DirectColor) {
213 SDL_memcpy(ramp, cmapTable[i].ramp, sizeof(*cmapTable[i].ramp)); 226 SDL_memcpy(ramp, cmapTable[i].ramp, SDL_GammaRampSize);
214 return 0; 227 return 0;
215 } 228 }
216 } 229 }
217 230
218 return -1; 231 return -1;