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Simple DirectMedia Layer
Copyright (C) 1997-2021 Sam Lantinga <>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
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* \file SDL_test_compare.h
* Include file for SDL test framework.
* This code is a part of the SDL2_test library, not the main SDL library.
Defines comparison functions (i.e. for surfaces).
#ifndef SDL_test_compare_h_
#define SDL_test_compare_h_
#include "SDL.h"
#include "SDL_test_images.h"
#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
* \brief Compares a surface and with reference image data for equality
* \param surface Surface used in comparison
* \param referenceSurface Test Surface used in comparison
* \param 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.
int SDLTest_CompareSurfaces(SDL_Surface *surface, SDL_Surface *referenceSurface, int allowable_error);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
#include "close_code.h"
#endif /* SDL_test_compare_h_ */
/* vi: set ts=4 sw=4 expandtab: */