The rendering context.
The horizontal scaling factor.
The vertical scaling factor.
true on success or false on failure; call SDL_GetError for more information.
Threadsafety: This function should only be called on the main thread.
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Set the drawing scale for rendering on the current target.
The drawing coordinates are scaled by the x/y scaling factors before they are used by the renderer. This allows resolution independent drawing with a single coordinate system.
If this results in scaling or subpixel drawing by the rendering backend, it will be handled using the appropriate quality hints. For best results use integer scaling factors.