Function SDL_RenderSetViewport

deps/SDL2/src/render/SDL_render.c:2098–2118

}

int
SDL_RenderSetViewport(SDL_Renderer * renderer, const SDL_Rect * rect)
{
    int retval;
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (rect) {
        renderer->viewport.x = (int)SDL_floor(rect->x * renderer->scale.x);
        renderer->viewport.y = (int)SDL_floor(rect->y * renderer->scale.y);
        renderer->viewport.w = (int)SDL_ceil(rect->w * renderer->scale.x);
        renderer->viewport.h = (int)SDL_ceil(rect->h * renderer->scale.y);
    } else {
        renderer->viewport.x = 0;
        renderer->viewport.y = 0;
        if (SDL_GetRendererOutputSize(renderer, &renderer->viewport.w, &renderer->viewport.h) < 0) {
            return -1;
        }
    }
    retval = QueueCmdSetViewport(renderer);
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

void
SDL_RenderGetViewport(SDL_Renderer * renderer, SDL_Rect * rect)