87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2023 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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* \file SDL_test_compare.h
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*
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* Comparison function of SDL test framework.
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*
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* This code is a part of the SDL test library, not the main SDL library.
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*/
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/*
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Defines comparison functions (i.e. for surfaces).
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*/
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#ifndef SDL_test_compare_h_
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#define SDL_test_compare_h_
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_begin_code.h>
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Retrieves a single pixel from a surface.
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*
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* This function prioritizes correctness over speed: it is suitable for
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* unit tests, but is not intended for use in a game engine.
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*
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* Like SDL_GetRGBA, this uses the entire 0..255 range when converting
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* color components from pixel formats with less than 8 bits per RGB
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* component.
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*
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* \param surface The surface
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* \param x Horizontal coordinate, 0 <= x < width
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* \param y Vertical coordinate, 0 <= y < height
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* \param r Pointer to location to store red channel, 0-255
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* \param g Pointer to location to store green channel, 0-255
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* \param b Pointer to location to store blue channel, 0-255
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* \param a Pointer to location to store alpha channel, 0-255
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* \returns 0 if the surface is valid and the coordinates are in-bounds
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*/
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int SDLTest_ReadSurfacePixel(SDL_Surface *surface, int x, int y, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);
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/**
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* Compares a surface and with reference image data for equality
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*
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* \param surface Surface used in comparison
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* \param referenceSurface Test Surface used in comparison
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* \param allowable_error Allowable difference (=sum of squared difference for each RGB component) in blending accuracy.
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*
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* \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.
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*/
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int SDLTest_CompareSurfaces(SDL_Surface *surface, SDL_Surface *referenceSurface, int allowable_error);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include <SDL3/SDL_close_code.h>
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#endif /* SDL_test_compare_h_ */
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