sdlxRenderCoordinatesFromWindow function render

({double x, double y})? sdlxRenderCoordinatesFromWindow(Pointer<SdlRenderer> renderer, double windowX, double windowY)

Get a point in render coordinates when given a point in window coordinates.

This takes into account several states:

• The window dimensions.
• The logical presentation settings (SDL_SetRenderLogicalPresentation)
• The scale (SDL_SetRenderScale)
• The viewport (SDL_SetRenderViewport)

\param renderer the rendering context. \param window_x the x coordinate in window coordinates. \param window_y the y coordinate in window coordinates. \param x a pointer filled with the x coordinate in render coordinates. \param y a pointer filled with the y coordinate in render coordinates. \returns true on success or false on failure; call SDL_GetError() for more information.

\threadsafety This function should only be called on the main thread.

\since This function is available since SDL 3.2.0.

\sa SDL_SetRenderLogicalPresentation \sa SDL_SetRenderScale

extern SDL_DECLSPEC bool SDLCALL SDL_RenderCoordinatesFromWindow(SDL_Renderer *renderer, float window_x, float window_y, float *x, float *y)

See also:

• SDL_RenderCoordinatesFromWindow - SDL3 Wiki

Implementation

({double x, double y})? sdlxRenderCoordinatesFromWindow(
  Pointer<SdlRenderer> renderer,
  double windowX,
  double windowY,
) {
  var x = 0.0;
  var y = 0.0;
  final xPointer = ffi.calloc<Float>();
  final yPointer = ffi.calloc<Float>();
  final result = sdlRenderCoordinatesFromWindow(
    renderer,
    windowX,
    windowY,
    xPointer,
    yPointer,
  );
  if (result) {
    x = xPointer.value;
    y = yPointer.value;
  }
  xPointer.callocFree();
  yPointer.callocFree();
  if (!result) {
    return null;
  }
  return (x: x, y: y);
}