Function SDL_RenderViewportSet 

pub unsafe extern "C" fn SDL_RenderViewportSet(
    renderer: *mut SDL_Renderer,
) -> bool

Return whether an explicit rectangle was set as the viewport.

This is useful if you’re saving and restoring the viewport and want to know whether you should restore a specific rectangle or NULL.

Each render target has its own viewport. This function checks the viewport for the current render target.

Parameters

• renderer: the rendering context.

Return value

Returns true if the viewport was set to a specific rectangle, or false if it was set to NULL (the entire target).

Thread safety

This function should only be called on the main thread.

Availability

This function is available since SDL 3.2.0.

See also

• SDL_GetRenderViewport
• SDL_SetRenderViewport