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test: Extract SDLTest_ReadSurfacePixel

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This is essentially the same as was added in d95d2d70, but with clearer
error handling. It's implemented in a private header file so that it
can be shared with SDL_shape, which also wants this functionality.

Resolves: https://github.com/libsdl-org/SDL/issues/8319
Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2023-10-02 19:43:44 +01:00 • committed by Sam Lantinga
parent 55a1458ed0
commit 0d68f45879
3 changed files with 121 additions and 27 deletions
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21
include/SDL3/SDL_test_compare.h
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@ -44,6 +44,27 @@
extern "C" {
#endif
/**
* \brief Retrieves a single pixel from a surface.
*
* This function prioritizes correctness over speed: it is suitable for
* unit tests, but is not intended for use in a game engine.
*
* Like SDL_GetRGBA, this uses the entire 0..255 range when converting
* color components from pixel formats with less than 8 bits per RGB
* component.
*
* \param surface The surface
* \param x Horizontal coordinate, 0 <= x < width
* \param y Vertical coordinate, 0 <= y < height
* \param r Pointer to location to store red channel, 0-255
* \param g Pointer to location to store green channel, 0-255
* \param b Pointer to location to store blue channel, 0-255
* \param a Pointer to location to store alpha channel, 0-255
* \returns 0 if the surface is valid and the coordinates are in-bounds
*/
int SDLTest_ReadSurfacePixel(SDL_Surface *surface, int x, int y, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);
/**
* \brief Compares a surface and with reference image data for equality
*