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--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401
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Sam Lantinga
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190
test/testgamma.c
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190
test/testgamma.c
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/* Bring up a window and manipulate the gamma on it */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "SDL.h"
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/* Turn a normal gamma value into an appropriate gamma ramp */
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void CalculateGamma(double gamma, Uint16 *ramp)
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{
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int i, value;
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gamma = 1.0 / gamma;
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for ( i=0; i<256; ++i ) {
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value = (int)(pow((double)i/256.0, gamma)*65535.0 + 0.5);
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if ( value > 65535 ) {
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value = 65535;
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}
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ramp[i] = (Uint16)value;
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}
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}
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/* This can be used as a general routine for all of the test programs */
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int get_video_args(char *argv[], int *w, int *h, int *bpp, Uint32 *flags)
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{
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int i;
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*w = 640;
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*h = 480;
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*bpp = 0;
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*flags = SDL_SWSURFACE;
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for ( i=1; argv[i]; ++i ) {
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if ( strcmp(argv[i], "-width") == 0 ) {
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if ( argv[i+1] ) {
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*w = atoi(argv[++i]);
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}
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} else
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if ( strcmp(argv[i], "-height") == 0 ) {
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if ( argv[i+1] ) {
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*h = atoi(argv[++i]);
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}
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} else
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if ( strcmp(argv[i], "-bpp") == 0 ) {
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if ( argv[i+1] ) {
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*bpp = atoi(argv[++i]);
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}
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} else
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if ( strcmp(argv[i], "-fullscreen") == 0 ) {
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*flags |= SDL_FULLSCREEN;
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} else
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if ( strcmp(argv[i], "-hw") == 0 ) {
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*flags |= SDL_HWSURFACE;
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} else
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if ( strcmp(argv[i], "-hwpalette") == 0 ) {
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*flags |= SDL_HWPALETTE;
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} else
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break;
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}
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return i;
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}
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int main(int argc, char *argv[])
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{
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SDL_Surface *screen;
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SDL_Surface *image;
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float gamma;
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int i;
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int w, h, bpp;
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Uint32 flags;
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Uint16 ramp[256];
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Uint16 red_ramp[256];
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Uint32 then, timeout;
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/* Check command line arguments */
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argv += get_video_args(argv, &w, &h, &bpp, &flags);
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/* Initialize SDL */
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if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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fprintf(stderr,
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"Couldn't initialize SDL: %s\n", SDL_GetError());
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exit(1);
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}
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atexit(SDL_Quit);
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/* Initialize the display, always use hardware palette */
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screen = SDL_SetVideoMode(w, h, bpp, flags | SDL_HWPALETTE);
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if ( screen == NULL ) {
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fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
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w, h, SDL_GetError());
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exit(1);
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}
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/* Set the window manager title bar */
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SDL_WM_SetCaption("SDL gamma test", "testgamma");
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/* Set the desired gamma, if any */
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gamma = 1.0f;
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if ( *argv ) {
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gamma = (float)atof(*argv);
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}
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if ( SDL_SetGamma(gamma, gamma, gamma) < 0 ) {
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fprintf(stderr, "Unable to set gamma: %s\n", SDL_GetError());
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exit(1);
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}
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#if 0 /* This isn't supported. Integrating the gamma ramps isn't exact */
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/* See what gamma was actually set */
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float real[3];
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if ( SDL_GetGamma(&real[0], &real[1], &real[2]) < 0 ) {
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printf("Couldn't get gamma: %s\n", SDL_GetError());
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} else {
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printf("Set gamma values: R=%2.2f, G=%2.2f, B=%2.2f\n",
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real[0], real[1], real[2]);
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}
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#endif
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/* Do all the drawing work */
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image = SDL_LoadBMP("sample.bmp");
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if ( image ) {
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SDL_Rect dst;
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dst.x = (screen->w - image->w)/2;
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dst.y = (screen->h - image->h)/2;
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dst.w = image->w;
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dst.h = image->h;
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SDL_BlitSurface(image, NULL, screen, &dst);
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SDL_UpdateRects(screen, 1, &dst);
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}
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/* Wait a bit, handling events */
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then = SDL_GetTicks();
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timeout = (5*1000);
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while ( (SDL_GetTicks()-then) < timeout ) {
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SDL_Event event;
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while ( SDL_PollEvent(&event) ) {
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switch (event.type) {
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case SDL_QUIT: /* Quit now */
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timeout = 0;
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break;
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case SDL_KEYDOWN:
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switch (event.key.keysym.sym) {
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case SDLK_SPACE: /* Go longer.. */
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timeout += (5*1000);
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break;
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case SDLK_UP:
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gamma += 0.2f;
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SDL_SetGamma(gamma, gamma, gamma);
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break;
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case SDLK_DOWN:
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gamma -= 0.2f;
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SDL_SetGamma(gamma, gamma, gamma);
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break;
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case SDLK_ESCAPE:
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timeout = 0;
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break;
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default:
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break;
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}
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break;
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}
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}
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}
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/* Perform a gamma flash to red using color ramps */
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while ( gamma < 10.0 ) {
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/* Increase the red gamma and decrease everything else... */
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gamma += 0.1f;
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CalculateGamma(gamma, red_ramp);
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CalculateGamma(1.0/gamma, ramp);
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SDL_SetGammaRamp(red_ramp, ramp, ramp);
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}
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/* Finish completely red */
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memset(red_ramp, 255, sizeof(red_ramp));
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memset(ramp, 0, sizeof(ramp));
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SDL_SetGammaRamp(red_ramp, ramp, ramp);
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/* Now fade out to black */
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for ( i=(red_ramp[0] >> 8); i >= 0; --i ) {
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memset(red_ramp, i, sizeof(red_ramp));
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SDL_SetGammaRamp(red_ramp, NULL, NULL);
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}
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SDL_Delay(1*1000);
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return(0);
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}
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