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common.c
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/**
* Automated SDL_Surface test.
*
* Written by Edgar Simo "bobbens"
*
* Released under Public Domain.
*/
#include "SDL.h"
#include "SDL_at.h"
#include "common/common.h"
/**
* @brief Compares a surface and a surface image for equality.
*/
int surface_compare( SDL_Surface *sur, const SurfaceImage_t *img )
{
int ret;
int i,j;
int bpp;
Uint8 *p, *pd;
/* Make sure size is the same. */
if ((sur->w != img->width) || (sur->h != img->height))
return -1;
SDL_LockSurface( sur );
ret = 0;
bpp = sur->format->BytesPerPixel;
/* Compare image - should be same format. */
for (j=0; j<sur->h; j++) {
for (i=0; i<sur->w; i++) {
p = (Uint8 *)sur->pixels + j * sur->pitch + i * bpp;
pd = (Uint8 *)img->pixel_data + (j*img->width + i) * img->bytes_per_pixel;
switch (bpp) {
case 1:
case 2:
case 3:
ret += 1;
printf("%d BPP not supported yet.\n",bpp);
break;
case 4:
ret += !( (p[0] == pd[0]) &&
(p[1] == pd[1]) &&
(p[2] == pd[2]) );
break;
}
}
}
SDL_UnlockSurface( sur );
return ret;
}