(This is the legacy documentation for SDL2, the previous stable version; SDL3 is the current stable version.)

SDL_RenderSetScale

Set the drawing scale for rendering on the current target.

Header File

Syntax

int SDL_RenderSetScale(SDL_Renderer * renderer,
                       float scaleX, float scaleY);

Function Parameters

SDL_Renderer *	renderer	a rendering context.
float	scaleX	the horizontal scaling factor.
float	scaleY	the vertical scaling factor.

Return Value

(int) Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.

Remarks

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.

Version

This function is available since SDL 2.0.0.