mirror of https://github.com/encounter/SDL.git
SDL_RenderSetIntegerScale
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@ -499,6 +499,30 @@ extern DECLSPEC int SDLCALL SDL_RenderSetLogicalSize(SDL_Renderer * renderer, in
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*/
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extern DECLSPEC void SDLCALL SDL_RenderGetLogicalSize(SDL_Renderer * renderer, int *w, int *h);
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/**
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* \brief Set whether to force integer scales for resolution-independent rendering
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*
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* \param renderer The renderer for which integer scaling should be set.
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* \param enable Enable or disable integer scaling
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*
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* This function restricts the logical viewport to integer values - that is, when
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* a resolution is between two multiples of a logical size, the viewport size is
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* rounded down to the lower multiple.
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*
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* \sa SDL_RenderSetLogicalSize()
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*/
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extern DECLSPEC int SDLCALL SDL_RenderSetIntegerScale(SDL_Renderer * renderer,
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SDL_bool enable);
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/**
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* \brief Get whether integer scales are forced for resolution-independent rendering
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*
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* \param renderer The renderer from which integer scaling should be queried.
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*
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* \sa SDL_RenderSetIntegerScale()
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_RenderGetIntegerScale(SDL_Renderer * renderer);
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/**
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* \brief Set the drawing area for rendering on the current target.
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*
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@ -1154,7 +1154,19 @@ UpdateLogicalSize(SDL_Renderer *renderer)
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/* Clear the scale because we're setting viewport in output coordinates */
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SDL_RenderSetScale(renderer, 1.0f, 1.0f);
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if (SDL_fabs(want_aspect-real_aspect) < 0.0001) {
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if (renderer->integer_scale) {
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if (want_aspect > real_aspect) {
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scale = w / renderer->logical_w;
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} else {
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scale = h / renderer->logical_h;
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}
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viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
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viewport.x = (w - viewport.w) / 2;
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viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
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viewport.y = (h - viewport.h) / 2;
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SDL_RenderSetViewport(renderer, &viewport);
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} else if (SDL_fabs(want_aspect-real_aspect) < 0.0001) {
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/* The aspect ratios are the same, just scale appropriately */
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scale = (float)w / renderer->logical_w;
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SDL_RenderSetViewport(renderer, NULL);
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@ -1215,6 +1227,24 @@ SDL_RenderGetLogicalSize(SDL_Renderer * renderer, int *w, int *h)
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}
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}
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int
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SDL_RenderSetIntegerScale(SDL_Renderer * renderer, SDL_bool enable)
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{
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CHECK_RENDERER_MAGIC(renderer, -1);
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renderer->integer_scale = enable;
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return UpdateLogicalSize(renderer);
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}
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SDL_bool
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SDLCALL SDL_RenderGetIntegerScale(SDL_Renderer * renderer)
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{
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CHECK_RENDERER_MAGIC(renderer, SDL_FALSE);
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return renderer->integer_scale;
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}
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int
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SDL_RenderSetViewport(SDL_Renderer * renderer, const SDL_Rect * rect)
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{
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@ -135,6 +135,9 @@ struct SDL_Renderer
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int logical_w_backup;
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int logical_h_backup;
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/* Whether or not to force the viewport to even integer intervals */
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SDL_bool integer_scale;
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/* The drawable area within the window */
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SDL_Rect viewport;
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SDL_Rect viewport_backup;
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