NAME¶

SDL_ReadSurfacePixel - Retrieves a single pixel from a surface.

SYNOPSIS¶

#include <SDL3/SDL_surface.h>

bool SDL_ReadSurfacePixel(SDL_Surface *surface, int x, int y, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);

DESCRIPTION¶

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.

FUNCTION PARAMETERS¶

surface

the surface to read.

x

the horizontal coordinate, 0 <= x < width.

y

the vertical coordinate, 0 <= y < height.

r

a pointer filled in with the red channel, 0-255, or NULL to ignore this channel.

g

a pointer filled in with the green channel, 0-255, or NULL to ignore this channel.

b

a pointer filled in with the blue channel, 0-255, or NULL to ignore this channel.

a

a pointer filled in with the alpha channel, 0-255, or NULL to ignore this channel.

RETURN VALUE¶

for more information.

THREAD SAFETY¶

This function is not thread safe.

AVAILABILITY¶

This function is available since SDL 3.2.0.