reassign 565638 libsdl1.2debian 1.2.13-5
retitle 565638 libsdl1.2: SDL_SetGamma() is nonfunctional with xorg 7.5
thanks
This bug has meanwhile migrated to testing, apparently triggered by the
update of xorg in testing from 7.4 to 7.5 (with xserver-xorg-core
updated from 1.6.5 to 1.7.4).
I have written a small SDL program testing the SDL_SetGamma() function,
and it works on a system with xorg 7.4, but silently fails do adjust the
gamma with xorg 7.5, so this is a bug in either libsdl or xorg.
Test program is attached. For now, I'm reassigning this bug to libsdl.
Nikolaus
/* A small test program, testing the SDL_SetGamma() function. Loads a test
* image test.png in full screen; after a few seconds, the test image should
* become brighter. Compile with
*
* gcc -o sdlgamma sdlgamma.c -I/usr/include/SDL
* -D_GNU_SOURCE=1 -D_REENTRANT -L/usr/lib -lSDL -lSDL_image
*/
#include "SDL.h" /* All SDL apps need this */
#include <stdio.h>
#include <stdlib.h> /* for exit() */
#include <SDL_image.h>
void display_bmp(char *file_name, SDL_Surface *screen)
{
SDL_Surface *image;
/* Load the BMP file into a surface */
image = IMG_Load(file_name);
if (image == NULL) {
fprintf(stderr, "Couldn't load %s: %sn", file_name, SDL_GetError());
return;
}
/*
* Palettized screen modes will have a default palette (a standard
* 8*8*4 colour cube), but if the image is palettized as well we can
* use that palette for a nicer colour matching
*/
if (image->format->palette && screen->format->palette) {
SDL_SetColors(screen, image->format->palette->colors, 0, image->format->palette->ncolors);
}
/* Blit onto the screen surface */
if(SDL_BlitSurface(image, NULL, screen, NULL) < 0)
fprintf(stderr, "BlitSurface error: %sn", SDL_GetError());
SDL_UpdateRect(screen, 0, 0, image->w, image->h);
/* Free the allocated BMP surface */
SDL_FreeSurface(image);
}
int main(int argc, char** argv) {
printf("Initializing SDL.\n");
/* Initialize defaults, Video and Audio subsystems */
if((SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO)==-1)) {
printf("Could not initialize SDL: %s.\n", SDL_GetError());
exit(-1);
}
printf("SDL initialized.\n");
/* NS: Set video mode. */
SDL_Surface* myVideoSurface = SDL_SetVideoMode(640, 480, 16, SDL_DOUBLEBUF|SDL_FULLSCREEN);
if (myVideoSurface == NULL) {
printf("Could not set video mode: %s.\n", SDL_GetError());
exit(-1);
}
display_bmp("test.png", myVideoSurface);
sleep(5);
/* NS: Try to set gamma values. */
puts("Trying to set gamma values.");
if ((SDL_SetGamma(1.8, 1.8, 1.8) == -1)) {
printf("Could not set gamma: %s.\n", SDL_GetError());
exit(-1);
}
puts("gamma values set.");
sleep(5);
puts("Trying to restore gamma values.");
if ((SDL_SetGamma(1.0, 1.0, 1.0) == -1)) {
printf("Could not set gamma: %s.\n", SDL_GetError());
exit(-1);
}
puts("gamma values restored.");
printf("Quitting SDL.\n");
/* Shutdown all subsystems */
SDL_Quit();
printf("Quitting...\n");
exit(0);
}
