test/testgamma.c
 changeset 1895 c121d94672cb parent 1151 be9c9c8f6d53
```     1.1 --- a/test/testgamma.c	Thu Jul 06 18:01:37 2006 +0000
1.2 +++ b/test/testgamma.c	Mon Jul 10 21:04:37 2006 +0000
1.3 @@ -9,189 +9,186 @@
1.4  #include "SDL.h"
1.5
1.6  /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
1.7 -static void quit(int rc)
1.8 +static void
1.9 +quit(int rc)
1.10  {
1.11 -	SDL_Quit();
1.12 -	exit(rc);
1.13 +    SDL_Quit();
1.14 +    exit(rc);
1.15  }
1.16
1.17  /* Turn a normal gamma value into an appropriate gamma ramp */
1.18 -void CalculateGamma(double gamma, Uint16 *ramp)
1.19 +void
1.20 +CalculateGamma(double gamma, Uint16 * ramp)
1.21  {
1.22 -	int i, value;
1.23 +    int i, value;
1.24
1.25 -	gamma = 1.0 / gamma;
1.26 -	for ( i=0; i<256; ++i ) {
1.27 -		value = (int)(pow((double)i/256.0, gamma)*65535.0 + 0.5);
1.28 -		if ( value > 65535 ) {
1.29 -			value = 65535;
1.30 -		}
1.31 -		ramp[i] = (Uint16)value;
1.32 -	}
1.33 +    gamma = 1.0 / gamma;
1.34 +    for (i = 0; i < 256; ++i) {
1.35 +        value = (int) (pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
1.36 +        if (value > 65535) {
1.37 +            value = 65535;
1.38 +        }
1.39 +        ramp[i] = (Uint16) value;
1.40 +    }
1.41  }
1.42
1.43  /* This can be used as a general routine for all of the test programs */
1.44 -int get_video_args(char *argv[], int *w, int *h, int *bpp, Uint32 *flags)
1.45 +int
1.46 +get_video_args(char *argv[], int *w, int *h, int *bpp, Uint32 * flags)
1.47  {
1.48 -	int i;
1.49 +    int i;
1.50
1.51 -	*w = 640;
1.52 -	*h = 480;
1.53 -	*bpp = 0;
1.54 -	*flags = SDL_SWSURFACE;
1.55 +    *w = 640;
1.56 +    *h = 480;
1.57 +    *bpp = 0;
1.58 +    *flags = SDL_SWSURFACE;
1.59
1.60 -	for ( i=1; argv[i]; ++i ) {
1.61 -		if ( strcmp(argv[i], "-width") == 0 ) {
1.62 -			if ( argv[i+1] ) {
1.63 -				*w = atoi(argv[++i]);
1.64 -			}
1.65 -		} else
1.66 -		if ( strcmp(argv[i], "-height") == 0 ) {
1.67 -			if ( argv[i+1] ) {
1.68 -				*h = atoi(argv[++i]);
1.69 -			}
1.70 -		} else
1.71 -		if ( strcmp(argv[i], "-bpp") == 0 ) {
1.72 -			if ( argv[i+1] ) {
1.73 -				*bpp = atoi(argv[++i]);
1.74 -			}
1.75 -		} else
1.76 -		if ( strcmp(argv[i], "-fullscreen") == 0 ) {
1.77 -			*flags |= SDL_FULLSCREEN;
1.78 -		} else
1.79 -		if ( strcmp(argv[i], "-hw") == 0 ) {
1.80 -			*flags |= SDL_HWSURFACE;
1.81 -		} else
1.82 -		if ( strcmp(argv[i], "-hwpalette") == 0 ) {
1.83 -			*flags |= SDL_HWPALETTE;
1.84 -		} else
1.85 -			break;
1.86 -	}
1.87 -	return i;
1.88 +    for (i = 1; argv[i]; ++i) {
1.89 +        if (strcmp(argv[i], "-width") == 0) {
1.90 +            if (argv[i + 1]) {
1.91 +                *w = atoi(argv[++i]);
1.92 +            }
1.93 +        } else if (strcmp(argv[i], "-height") == 0) {
1.94 +            if (argv[i + 1]) {
1.95 +                *h = atoi(argv[++i]);
1.96 +            }
1.97 +        } else if (strcmp(argv[i], "-bpp") == 0) {
1.98 +            if (argv[i + 1]) {
1.99 +                *bpp = atoi(argv[++i]);
1.100 +            }
1.101 +        } else if (strcmp(argv[i], "-fullscreen") == 0) {
1.102 +            *flags |= SDL_FULLSCREEN;
1.103 +        } else if (strcmp(argv[i], "-hw") == 0) {
1.104 +            *flags |= SDL_HWSURFACE;
1.105 +        } else if (strcmp(argv[i], "-hwpalette") == 0) {
1.106 +            *flags |= SDL_HWPALETTE;
1.107 +        } else
1.108 +            break;
1.109 +    }
1.110 +    return i;
1.111  }
1.112
1.113 -int main(int argc, char *argv[])
1.114 +int
1.115 +main(int argc, char *argv[])
1.116  {
1.117 -	SDL_Surface *screen;
1.118 -	SDL_Surface *image;
1.119 -	float gamma;
1.120 -	int i;
1.121 -	int w, h, bpp;
1.122 -	Uint32 flags;
1.123 -	Uint16 ramp[256];
1.124 -	Uint16 red_ramp[256];
1.125 -	Uint32 then, timeout;
1.126 +    SDL_Surface *screen;
1.127 +    SDL_Surface *image;
1.128 +    float gamma;
1.129 +    int i;
1.130 +    int w, h, bpp;
1.131 +    Uint32 flags;
1.132 +    Uint16 ramp[256];
1.133 +    Uint16 red_ramp[256];
1.134 +    Uint32 then, timeout;
1.135
1.136 -	/* Check command line arguments */
1.137 -	argv += get_video_args(argv, &w, &h, &bpp, &flags);
1.138 +    /* Check command line arguments */
1.139 +    argv += get_video_args(argv, &w, &h, &bpp, &flags);
1.140
1.141 -	/* Initialize SDL */
1.142 -	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
1.143 -		fprintf(stderr,
1.144 -			"Couldn't initialize SDL: %s\n", SDL_GetError());
1.145 -		return(1);
1.146 -	}
1.147 +    /* Initialize SDL */
1.148 +    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
1.149 +        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
1.150 +        return (1);
1.151 +    }
1.152
1.153 -	/* Initialize the display, always use hardware palette */
1.154 -	screen = SDL_SetVideoMode(w, h, bpp, flags | SDL_HWPALETTE);
1.155 -	if ( screen == NULL ) {
1.156 -		fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
1.157 -						w, h, SDL_GetError());
1.158 -		quit(1);
1.159 -	}
1.160 +    /* Initialize the display, always use hardware palette */
1.161 +    screen = SDL_SetVideoMode(w, h, bpp, flags | SDL_HWPALETTE);
1.162 +    if (screen == NULL) {
1.163 +        fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
1.164 +                w, h, SDL_GetError());
1.165 +        quit(1);
1.166 +    }
1.167
1.168 -	/* Set the window manager title bar */
1.169 -	SDL_WM_SetCaption("SDL gamma test", "testgamma");
1.170 +    /* Set the window manager title bar */
1.171 +    SDL_WM_SetCaption("SDL gamma test", "testgamma");
1.172
1.173 -	/* Set the desired gamma, if any */
1.174 -	gamma = 1.0f;
1.175 -	if ( *argv ) {
1.176 -		gamma = (float)atof(*argv);
1.177 -	}
1.178 -	if ( SDL_SetGamma(gamma, gamma, gamma) < 0 ) {
1.179 -		fprintf(stderr, "Unable to set gamma: %s\n", SDL_GetError());
1.180 -		quit(1);
1.181 -	}
1.182 -
1.183 -#if 0 /* This isn't supported.  Integrating the gamma ramps isn't exact */
1.184 -	/* See what gamma was actually set */
1.185 -	float real[3];
1.186 -	if ( SDL_GetGamma(&real[0], &real[1], &real[2]) < 0 ) {
1.187 -		printf("Couldn't get gamma: %s\n", SDL_GetError());
1.188 -	} else {
1.189 -		printf("Set gamma values: R=%2.2f, G=%2.2f, B=%2.2f\n",
1.190 -			real[0], real[1], real[2]);
1.191 -	}
1.192 +    /* Set the desired gamma, if any */
1.193 +    gamma = 1.0f;
1.194 +    if (*argv) {
1.195 +        gamma = (float) atof(*argv);
1.196 +    }
1.197 +    if (SDL_SetGamma(gamma, gamma, gamma) < 0) {
1.198 +        fprintf(stderr, "Unable to set gamma: %s\n", SDL_GetError());
1.199 +        quit(1);
1.200 +    }
1.201 +#if 0                           /* This isn't supported.  Integrating the gamma ramps isn't exact */
1.202 +    /* See what gamma was actually set */
1.203 +    float real[3];
1.204 +    if (SDL_GetGamma(&real[0], &real[1], &real[2]) < 0) {
1.205 +        printf("Couldn't get gamma: %s\n", SDL_GetError());
1.206 +    } else {
1.207 +        printf("Set gamma values: R=%2.2f, G=%2.2f, B=%2.2f\n",
1.208 +               real[0], real[1], real[2]);
1.209 +    }
1.210  #endif
1.211
1.212 -	/* Do all the drawing work */
1.214 -	if ( image ) {
1.215 -		SDL_Rect dst;
1.216 +    /* Do all the drawing work */
1.218 +    if (image) {
1.219 +        SDL_Rect dst;
1.220
1.221 -		dst.x = (screen->w - image->w)/2;
1.222 -		dst.y = (screen->h - image->h)/2;
1.223 -		dst.w = image->w;
1.224 -		dst.h = image->h;
1.225 -		SDL_BlitSurface(image, NULL, screen, &dst);
1.226 -		SDL_UpdateRects(screen, 1, &dst);
1.227 -	}
1.228 +        dst.x = (screen->w - image->w) / 2;
1.229 +        dst.y = (screen->h - image->h) / 2;
1.230 +        dst.w = image->w;
1.231 +        dst.h = image->h;
1.232 +        SDL_BlitSurface(image, NULL, screen, &dst);
1.233 +        SDL_UpdateRects(screen, 1, &dst);
1.234 +    }
1.235
1.236 -	/* Wait a bit, handling events */
1.237 -	then = SDL_GetTicks();
1.238 -	timeout = (5*1000);
1.239 -	while ( (SDL_GetTicks()-then) < timeout ) {
1.240 -		SDL_Event event;
1.241 +    /* Wait a bit, handling events */
1.242 +    then = SDL_GetTicks();
1.243 +    timeout = (5 * 1000);
1.244 +    while ((SDL_GetTicks() - then) < timeout) {
1.245 +        SDL_Event event;
1.246
1.247 -		while ( SDL_PollEvent(&event) ) {
1.248 -			switch (event.type) {
1.249 -			    case SDL_QUIT:	/* Quit now */
1.250 -				timeout = 0;
1.251 -				break;
1.252 -			    case SDL_KEYDOWN:
1.253 -				switch (event.key.keysym.sym) {
1.254 -				    case SDLK_SPACE:	/* Go longer.. */
1.255 -					timeout += (5*1000);
1.256 -					break;
1.257 -				    case SDLK_UP:
1.258 -					gamma += 0.2f;
1.259 -					SDL_SetGamma(gamma, gamma, gamma);
1.260 -					break;
1.261 -				    case SDLK_DOWN:
1.262 -					gamma -= 0.2f;
1.263 -					SDL_SetGamma(gamma, gamma, gamma);
1.264 -					break;
1.265 -				    case SDLK_ESCAPE:
1.266 -					timeout = 0;
1.267 -					break;
1.268 -				    default:
1.269 -					break;
1.270 -				}
1.271 -				break;
1.272 -			}
1.273 -		}
1.274 -	}
1.275 +        while (SDL_PollEvent(&event)) {
1.276 +            switch (event.type) {
1.277 +            case SDL_QUIT:     /* Quit now */
1.278 +                timeout = 0;
1.279 +                break;
1.280 +            case SDL_KEYDOWN:
1.281 +                switch (event.key.keysym.sym) {
1.282 +                case SDLK_SPACE:       /* Go longer.. */
1.283 +                    timeout += (5 * 1000);
1.284 +                    break;
1.285 +                case SDLK_UP:
1.286 +                    gamma += 0.2f;
1.287 +                    SDL_SetGamma(gamma, gamma, gamma);
1.288 +                    break;
1.289 +                case SDLK_DOWN:
1.290 +                    gamma -= 0.2f;
1.291 +                    SDL_SetGamma(gamma, gamma, gamma);
1.292 +                    break;
1.293 +                case SDLK_ESCAPE:
1.294 +                    timeout = 0;
1.295 +                    break;
1.296 +                default:
1.297 +                    break;
1.298 +                }
1.299 +                break;
1.300 +            }
1.301 +        }
1.302 +    }
1.303
1.304 -	/* Perform a gamma flash to red using color ramps */
1.305 -	while ( gamma < 10.0 ) {
1.306 -		/* Increase the red gamma and decrease everything else... */
1.307 -		gamma += 0.1f;
1.308 -		CalculateGamma(gamma, red_ramp);
1.309 -		CalculateGamma(1.0/gamma, ramp);
1.310 -		SDL_SetGammaRamp(red_ramp, ramp, ramp);
1.311 -	}
1.312 -	/* Finish completely red */
1.313 -	memset(red_ramp, 255, sizeof(red_ramp));
1.314 -	memset(ramp, 0, sizeof(ramp));
1.315 -	SDL_SetGammaRamp(red_ramp, ramp, ramp);
1.316 +    /* Perform a gamma flash to red using color ramps */
1.317 +    while (gamma < 10.0) {
1.318 +        /* Increase the red gamma and decrease everything else... */
1.319 +        gamma += 0.1f;
1.320 +        CalculateGamma(gamma, red_ramp);
1.321 +        CalculateGamma(1.0 / gamma, ramp);
1.322 +        SDL_SetGammaRamp(red_ramp, ramp, ramp);
1.323 +    }
1.324 +    /* Finish completely red */
1.325 +    memset(red_ramp, 255, sizeof(red_ramp));
1.326 +    memset(ramp, 0, sizeof(ramp));
1.327 +    SDL_SetGammaRamp(red_ramp, ramp, ramp);
1.328
1.329 -	/* Now fade out to black */
1.330 -	for ( i=(red_ramp[0] >> 8); i >= 0; --i ) {
1.331 -		memset(red_ramp, i, sizeof(red_ramp));
1.332 -		SDL_SetGammaRamp(red_ramp, NULL, NULL);
1.333 -	}
1.334 -	SDL_Delay(1*1000);
1.335 +    /* Now fade out to black */
1.336 +    for (i = (red_ramp[0] >> 8); i >= 0; --i) {
1.337 +        memset(red_ramp, i, sizeof(red_ramp));
1.338 +        SDL_SetGammaRamp(red_ramp, NULL, NULL);
1.339 +    }
1.340 +    SDL_Delay(1 * 1000);
1.341
1.342 -	SDL_Quit();
1.343 -	return(0);
1.344 +    SDL_Quit();
1.345 +    return (0);
1.346  }
```