sdlxReadSurfacePixelFloat function surface

SdlxFColor? sdlxReadSurfacePixelFloat(Pointer<SdlSurface> surface, SdlxPoint point)

Retrieves a single pixel from a surface as RGBA in the sRGB colorspace.

This function prioritizes correctness over speed: it is suitable for unit tests, but is not intended for use in a game engine.

\param surface the surface to read. \param x the horizontal coordinate, 0 <= x < width. \param y the vertical coordinate, 0 <= y < height. \param r a pointer filled in with the red channel, normally in the range 0-1, or NULL to ignore this channel. \param g a pointer filled in with the green channel, normally in the range 0-1, or NULL to ignore this channel. \param b a pointer filled in with the blue channel, normally in the range 0-1, or NULL to ignore this channel. \param a a pointer filled in with the alpha channel, normally in the range 0-1, or NULL to ignore this channel. \returns true on success or false on failure; call SDL_GetError() for more information.

\threadsafety This function can be called on different threads with different surfaces.

\since This function is available since SDL 3.2.0.

extern SDL_DECLSPEC bool SDLCALL SDL_ReadSurfacePixelFloat(SDL_Surface *surface, int x, int y, float *r, float *g, float *b, float *a)

See also:

• SDL_ReadSurfacePixelFloat - SDL3 Wiki

Implementation

SdlxFColor? sdlxReadSurfacePixelFloat(
  Pointer<SdlSurface> surface,
  SdlxPoint point,
) => ffi.using((arena) {
  final rPointer = arena<Float>();
  final gPointer = arena<Float>();
  final bPointer = arena<Float>();
  final aPointer = arena<Float>();

  final result = sdlReadSurfacePixelFloat(
    surface,
    point.x,
    point.y,
    rPointer,
    gPointer,
    bPointer,
    aPointer,
  );

  if (!result) {
    return null;
  }

  return SdlxFColor(
    rPointer.value,
    gPointer.value,
    bPointer.value,
    aPointer.value,
  );
});