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annotate test/testgamma.c @ 4425:a3e71b957215

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Fixed bug #961 Kalle Olavi Niemitalo 2010-02-28 09:15:50 PST It seems the SDLK_LMETA and SDLK_RMETA constants have been removed from SDL 1.3. I grepped for them in the SDL source tree and these were the only hits: ./include/SDL_compat.h:230:#define SDLK_LSUPER SDLK_LMETA ./include/SDL_compat.h:231:#define SDLK_RSUPER SDLK_RMETA ./src/video/bwindow/SDL_BWin.h:194: keymap[0x66] = SDLK_LMETA; ./src/video/bwindow/SDL_BWin.h:195: keymap[0x67] = SDLK_RMETA; I don't know how compatible SDL 1.3 is supposed to be with applications designed for SDL 1.2. However, as you can see, SDL itself is still trying to use the removed constants, and that is clearly a bug. Because SDL_compat.h defines KMOD_LMETA as KMOD_LGUI, I suppose it should also define SDLK_LMETA as SDLK_LGUI, and SDLK_RMETA likewise.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 Mar 2010 06:07:48 +0000
parents c121d94672cb
children
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0
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1
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2 /* Bring up a window and manipulate the gamma on it */
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3
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4 #include <stdlib.h>
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5 #include <stdio.h>
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6 #include <string.h>
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7 #include <math.h>
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8
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9 #include "SDL.h"
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10
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11 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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12 static void
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13 quit(int rc)
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14 {
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15 SDL_Quit();
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16 exit(rc);
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17 }
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18
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19 /* Turn a normal gamma value into an appropriate gamma ramp */
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20 void
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21 CalculateGamma(double gamma, Uint16 * ramp)
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22 {
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23 int i, value;
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24
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25 gamma = 1.0 / gamma;
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26 for (i = 0; i < 256; ++i) {
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27 value = (int) (pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
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28 if (value > 65535) {
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29 value = 65535;
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30 }
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31 ramp[i] = (Uint16) value;
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32 }
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33 }
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34
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35 /* This can be used as a general routine for all of the test programs */
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36 int
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37 get_video_args(char *argv[], int *w, int *h, int *bpp, Uint32 * flags)
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38 {
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39 int i;
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40
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41 *w = 640;
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42 *h = 480;
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43 *bpp = 0;
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44 *flags = SDL_SWSURFACE;
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45
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46 for (i = 1; argv[i]; ++i) {
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47 if (strcmp(argv[i], "-width") == 0) {
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48 if (argv[i + 1]) {
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49 *w = atoi(argv[++i]);
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50 }
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51 } else if (strcmp(argv[i], "-height") == 0) {
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52 if (argv[i + 1]) {
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53 *h = atoi(argv[++i]);
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54 }
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55 } else if (strcmp(argv[i], "-bpp") == 0) {
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56 if (argv[i + 1]) {
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57 *bpp = atoi(argv[++i]);
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58 }
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59 } else if (strcmp(argv[i], "-fullscreen") == 0) {
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60 *flags |= SDL_FULLSCREEN;
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61 } else if (strcmp(argv[i], "-hw") == 0) {
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62 *flags |= SDL_HWSURFACE;
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63 } else if (strcmp(argv[i], "-hwpalette") == 0) {
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64 *flags |= SDL_HWPALETTE;
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65 } else
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66 break;
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67 }
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68 return i;
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69 }
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70
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71 int
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72 main(int argc, char *argv[])
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73 {
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74 SDL_Surface *screen;
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75 SDL_Surface *image;
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76 float gamma;
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77 int i;
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78 int w, h, bpp;
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79 Uint32 flags;
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80 Uint16 ramp[256];
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81 Uint16 red_ramp[256];
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82 Uint32 then, timeout;
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83
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84 /* Check command line arguments */
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85 argv += get_video_args(argv, &w, &h, &bpp, &flags);
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86
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87 /* Initialize SDL */
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88 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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89 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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90 return (1);
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91 }
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92
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93 /* Initialize the display, always use hardware palette */
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94 screen = SDL_SetVideoMode(w, h, bpp, flags | SDL_HWPALETTE);
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95 if (screen == NULL) {
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96 fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
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97 w, h, SDL_GetError());
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98 quit(1);
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99 }
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100
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101 /* Set the window manager title bar */
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102 SDL_WM_SetCaption("SDL gamma test", "testgamma");
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103
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104 /* Set the desired gamma, if any */
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105 gamma = 1.0f;
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106 if (*argv) {
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107 gamma = (float) atof(*argv);
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108 }
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109 if (SDL_SetGamma(gamma, gamma, gamma) < 0) {
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110 fprintf(stderr, "Unable to set gamma: %s\n", SDL_GetError());
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111 quit(1);
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112 }
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113 #if 0 /* This isn't supported. Integrating the gamma ramps isn't exact */
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114 /* See what gamma was actually set */
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115 float real[3];
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116 if (SDL_GetGamma(&real[0], &real[1], &real[2]) < 0) {
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117 printf("Couldn't get gamma: %s\n", SDL_GetError());
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118 } else {
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119 printf("Set gamma values: R=%2.2f, G=%2.2f, B=%2.2f\n",
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120 real[0], real[1], real[2]);
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121 }
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122 #endif
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123
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124 /* Do all the drawing work */
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125 image = SDL_LoadBMP("sample.bmp");
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126 if (image) {
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127 SDL_Rect dst;
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128
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129 dst.x = (screen->w - image->w) / 2;
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130 dst.y = (screen->h - image->h) / 2;
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131 dst.w = image->w;
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132 dst.h = image->h;
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133 SDL_BlitSurface(image, NULL, screen, &dst);
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134 SDL_UpdateRects(screen, 1, &dst);
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135 }
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136
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137 /* Wait a bit, handling events */
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138 then = SDL_GetTicks();
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139 timeout = (5 * 1000);
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140 while ((SDL_GetTicks() - then) < timeout) {
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141 SDL_Event event;
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142
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143 while (SDL_PollEvent(&event)) {
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144 switch (event.type) {
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145 case SDL_QUIT: /* Quit now */
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146 timeout = 0;
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147 break;
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148 case SDL_KEYDOWN:
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149 switch (event.key.keysym.sym) {
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150 case SDLK_SPACE: /* Go longer.. */
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151 timeout += (5 * 1000);
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152 break;
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153 case SDLK_UP:
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154 gamma += 0.2f;
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155 SDL_SetGamma(gamma, gamma, gamma);
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156 break;
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157 case SDLK_DOWN:
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158 gamma -= 0.2f;
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159 SDL_SetGamma(gamma, gamma, gamma);
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160 break;
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161 case SDLK_ESCAPE:
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162 timeout = 0;
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163 break;
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164 default:
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165 break;
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166 }
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167 break;
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168 }
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169 }
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170 }
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171
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172 /* Perform a gamma flash to red using color ramps */
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173 while (gamma < 10.0) {
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174 /* Increase the red gamma and decrease everything else... */
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175 gamma += 0.1f;
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176 CalculateGamma(gamma, red_ramp);
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177 CalculateGamma(1.0 / gamma, ramp);
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178 SDL_SetGammaRamp(red_ramp, ramp, ramp);
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179 }
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180 /* Finish completely red */
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181 memset(red_ramp, 255, sizeof(red_ramp));
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182 memset(ramp, 0, sizeof(ramp));
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183 SDL_SetGammaRamp(red_ramp, ramp, ramp);
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184
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185 /* Now fade out to black */
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186 for (i = (red_ramp[0] >> 8); i >= 0; --i) {
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187 memset(red_ramp, i, sizeof(red_ramp));
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188 SDL_SetGammaRamp(red_ramp, NULL, NULL);
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189 }
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190 SDL_Delay(1 * 1000);
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191
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192 SDL_Quit();
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193 return (0);
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194 }