mirror of
https://github.com/Relintai/sdl2_frt.git
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116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/*
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Based on automated SDL_Surface tests originally written by Edgar Simo 'bobbens'.
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Rewritten for test lib by Andreas Schiffler.
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*/
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#include "SDL_config.h"
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#include "SDL_test.h"
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/* Counter for _CompareSurface calls; used for filename creation when comparisons fail */
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static int _CompareSurfaceCount = 0;
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/* Compare surfaces */
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int SDLTest_CompareSurfaces(SDL_Surface *surface, SDL_Surface *referenceSurface, int allowable_error)
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{
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int ret;
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int i,j;
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int bpp, bpp_reference;
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Uint8 *p, *p_reference;
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int dist;
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int sampleErrorX = 0, sampleErrorY = 0, sampleDist = 0;
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Uint8 R, G, B, A;
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Uint8 Rd, Gd, Bd, Ad;
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char imageFilename[128];
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char referenceFilename[128];
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/* Validate input surfaces */
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if (surface == NULL || referenceSurface == NULL) {
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return -1;
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}
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/* Make sure surface size is the same. */
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if ((surface->w != referenceSurface->w) || (surface->h != referenceSurface->h)) {
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return -2;
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}
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/* Sanitize input value */
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if (allowable_error<0) {
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allowable_error = 0;
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}
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SDL_LockSurface( surface );
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SDL_LockSurface( referenceSurface );
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ret = 0;
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bpp = surface->format->BytesPerPixel;
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bpp_reference = referenceSurface->format->BytesPerPixel;
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/* Compare image - should be same format. */
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for (j=0; j<surface->h; j++) {
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for (i=0; i<surface->w; i++) {
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p = (Uint8 *)surface->pixels + j * surface->pitch + i * bpp;
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p_reference = (Uint8 *)referenceSurface->pixels + j * referenceSurface->pitch + i * bpp_reference;
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SDL_GetRGBA(*(Uint32*)p, surface->format, &R, &G, &B, &A);
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SDL_GetRGBA(*(Uint32*)p_reference, referenceSurface->format, &Rd, &Gd, &Bd, &Ad);
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dist = 0;
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dist += (R-Rd)*(R-Rd);
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dist += (G-Gd)*(G-Gd);
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dist += (B-Bd)*(B-Bd);
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/* Allow some difference in blending accuracy */
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if (dist > allowable_error) {
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ret++;
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if (ret == 1) {
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sampleErrorX = i;
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sampleErrorY = j;
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sampleDist = dist;
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}
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}
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}
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}
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SDL_UnlockSurface( surface );
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SDL_UnlockSurface( referenceSurface );
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/* Save test image and reference for analysis on failures */
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_CompareSurfaceCount++;
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if (ret != 0) {
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SDLTest_LogError("Comparison of pixels with allowable error of %i failed %i times.", allowable_error, ret);
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SDLTest_LogError("First detected occurrence at position %i,%i with a squared RGB-difference of %i.", sampleErrorX, sampleErrorY, sampleDist);
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SDL_snprintf(imageFilename, 127, "CompareSurfaces%04d_TestOutput.bmp", _CompareSurfaceCount);
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SDL_SaveBMP(surface, imageFilename);
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SDL_snprintf(referenceFilename, 127, "CompareSurfaces%04d_Reference.bmp", _CompareSurfaceCount);
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SDL_SaveBMP(referenceSurface, referenceFilename);
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SDLTest_LogError("Surfaces from failed comparison saved as '%s' and '%s'", imageFilename, referenceFilename);
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}
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return ret;
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}
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