sdlGetRgba function
Get RGBA values from a pixel in the specified 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).
\param pixel a pixel value \param format an SDL_PixelFormat structure describing the format of the pixel \param r a pointer filled in with the red component \param g a pointer filled in with the green component \param b a pointer filled in with the blue component \param a a pointer filled in with the alpha component
\since This function is available since SDL 2.0.0.
\sa SDL_GetRGB \sa SDL_MapRGB \sa SDL_MapRGBA
extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * format, Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
Implementation
void sdlGetRgba(int pixel, Pointer<SdlPixelFormat> format, Pointer<Uint8> r,
Pointer<Uint8> g, Pointer<Uint8> b, Pointer<Uint8> a) {
final sdlGetRgbaLookupFunction = libSdl2.lookupFunction<
Void Function(
Uint32 pixel,
Pointer<SdlPixelFormat> format,
Pointer<Uint8> r,
Pointer<Uint8> g,
Pointer<Uint8> b,
Pointer<Uint8> a),
void Function(int pixel, Pointer<SdlPixelFormat> format, Pointer<Uint8> r,
Pointer<Uint8> g, Pointer<Uint8> b, Pointer<Uint8> a)>('SDL_GetRGBA');
return sdlGetRgbaLookupFunction(pixel, format, r, g, b, a);
}