Compares a surface and with reference image data for equality.
- Parameters
-
surface | Surface used in comparison |
referenceSurface | Test Surface used in comparison |
allowable_error | Allowable difference (=sum of squared difference for each RGB component) in blending accuracy. |
- Returns
- 0 if comparison succeeded, >0 (=number of pixels for which the comparison failed) if comparison failed, -1 if any of the surfaces were NULL, -2 if the surface sizes differ.
Definition at line 39 of file SDL_test_compare.c.
References _CompareSurfaceCount, SDL_PixelFormat::BytesPerPixel, SDL_Surface::format, G, SDL_Surface::h, i, j, NULL, SDL_Surface::pitch, SDL_Surface::pixels, SDL_GetRGBA, SDL_LockSurface, SDL_SaveBMP, SDL_snprintf, SDL_UnlockSurface, SDLTest_LogError(), and SDL_Surface::w.
Referenced by _compare(), surface_testBlit(), surface_testBlitAlphaMod(), surface_testBlitBlendAdd(), surface_testBlitBlendBlend(), surface_testBlitBlendLoop(), surface_testBlitBlendMod(), surface_testBlitBlendNone(), surface_testBlitColorMod(), surface_testCompleteSurfaceConversion(), and surface_testSurfaceConversion().
43 int bpp, bpp_reference;
46 int sampleErrorX = 0, sampleErrorY = 0, sampleDist = 0;
49 char imageFilename[128];
50 char referenceFilename[128];
53 if (surface ==
NULL || referenceSurface ==
NULL) {
58 if ((surface->
w != referenceSurface->
w) || (surface->
h != referenceSurface->
h)) {
63 if (allowable_error<0) {
74 for (j=0; j<surface->
h; j++) {
75 for (i=0; i<surface->
w; i++) {
77 p_reference = (
Uint8 *)referenceSurface->
pixels + j * referenceSurface->
pitch + i * bpp_reference;
83 dist += (R-Rd)*(R-Rd);
84 dist += (G-Gd)*(G-Gd);
85 dist += (B-Bd)*(B-Bd);
88 if (dist > allowable_error) {
105 SDLTest_LogError(
"Comparison of pixels with allowable error of %i failed %i times.", allowable_error, ret);
106 SDLTest_LogError(
"First detected occurrence at position %i,%i with a squared RGB-difference of %i.", sampleErrorX, sampleErrorY, sampleDist);
111 SDLTest_LogError(
"Surfaces from failed comparison saved as '%s' and '%s'", imageFilename, referenceFilename);
#define SDL_UnlockSurface
#define SDL_SaveBMP(surface, file)
static int _CompareSurfaceCount
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
void SDLTest_LogError(SDL_PRINTF_FORMAT_STRING const char *fmt,...) SDL_PRINTF_VARARG_FUNC(1)
Prints given message with a timestamp in the TEST category and the ERROR priority.
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int int in j)