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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"
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#include "../SDL_at.h"
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#include "common.h"
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/**
* @brief Compares a surface and a surface image for equality.
*/
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int surface_compare( SDL_Surface *sur, const SurfaceImage_t *img, int allowable_error )
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{
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;
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/*printf("%d BPP not supported yet.\n",bpp);*/
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break;
case 4:
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Uint8 R, G, B, A;
SDL_GetRGBA(*(Uint32*)p, sur->format, &R, &G, &B, &A);
if (img->bytes_per_pixel == 3) {
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dist += (R-pd[0])*(R-pd[0]);
dist += (G-pd[1])*(G-pd[1]);
dist += (B-pd[2])*(B-pd[2]);
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dist += (R-pd[0])*(R-pd[0]);
dist += (G-pd[1])*(G-pd[1]);
dist += (B-pd[2])*(B-pd[2]);
dist += (A-pd[3])*(A-pd[3]);
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/* Allow some difference in blending accuracy */
if (dist > allowable_error) {
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/*printf("pixel %d,%d varies by %d\n", i, j, dist);*/
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break;
}
}
}
SDL_UnlockSurface( sur );
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if (ret) {
SDL_SaveBMP(sur, "fail.bmp");
SDL_LockSurface( sur );
bpp = sur->format->BytesPerPixel;
/* Compare image - should be same format. */
if (bpp == 4) {
for (j=0; j<sur->h; j++) {
for (i=0; i<sur->w; i++) {
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Uint8 R, G, B, A;
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p = (Uint8 *)sur->pixels + j * sur->pitch + i * bpp;
pd = (Uint8 *)img->pixel_data + (j*img->width + i) * img->bytes_per_pixel;
R = pd[0];
G = pd[1];
B = pd[2];
if (img->bytes_per_pixel == 4) {
A = pd[3];
} else {
A = 0;
}
*(Uint32*)p = (A << 24) | (R << 16) | (G << 8) | B;
}
}
}
SDL_UnlockSurface( sur );
SDL_SaveBMP(sur, "good.bmp");
}
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return ret;
}