// in case we need to scale down a lot.
virtual bool need_texture_bounce() const { return true; }
virtual bool needs_mipmaps() const { return true; }
+ virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
virtual bool changes_output_size() const { return true; }
virtual void get_output_size(unsigned *width, unsigned *height, unsigned *virtual_width, unsigned *virtual_height) const;