Various event types are converted with this function: mouse, touch, pen, etc.
Touch coordinates are converted from normalized coordinates in the window
to non-normalized rendering coordinates.
Relative mouse coordinates (xrel and yrel event fields) are _also_
converted. Applications that do not want these fields converted should use
SDL_RenderCoordinatesFromWindow on the specific event fields instead of
converting the entire event structure.
Once converted, coordinates may be outside the rendering area.
Convert the coordinates in an event to render coordinates.
This takes into account several states:
- The window dimensions. - The logical presentation settings SDL_SetRenderLogicalPresentation - The scale SDL_SetRenderScale - The viewport SDL_SetRenderViewport
Various event types are converted with this function: mouse, touch, pen, etc.
Touch coordinates are converted from normalized coordinates in the window to non-normalized rendering coordinates.
Relative mouse coordinates (xrel and yrel event fields) are _also_ converted. Applications that do not want these fields converted should use SDL_RenderCoordinatesFromWindow on the specific event fields instead of converting the entire event structure.
Once converted, coordinates may be outside the rendering area.