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Man Pages
SDL_GetRGBA(3) SDL API Reference SDL_GetRGBA(3)

SDL_GetRGBA - Get RGBA values from a pixel in the specified pixel format.

#include "SDL.h"
void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);

Get RGBA component values from a pixel stored in the specified pixel format.
This function uses the entire 8-bit [0..255] range when converting color components from pixel formats with less than 8-bits per RGB component (e.g., a completely white pixel in 16-bit RGB565 format would return [0xff, 0xff, 0xff] not [0xf8, 0xfc, 0xf8]).
If the surface has no alpha component, the alpha will be returned as 0xff (100% opaque).

SDL_GetRGB, SDL_MapRGB, SDL_MapRGBA, SDL_PixelFormat
Tue 11 Sep 2001, 23:01 SDL

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