virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
private:
float transition_width, progress;
int inverse; // 0 or 1.
virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
private:
float transition_width, progress;
int inverse; // 0 or 1.