-#ifndef _OVERLAY_EFFECT_H
-#define _OVERLAY_EFFECT_H 1
+#ifndef _MOVIT_OVERLAY_EFFECT_H
+#define _MOVIT_OVERLAY_EFFECT_H 1
// Put one image on top of another, using alpha where appropriate.
// (If both images are the same aspect and the top image has alpha=1.0
//
// The first input is the bottom, and the second is the top.
+#include <string>
+
#include "effect.h"
+namespace movit {
+
class OverlayEffect : public Effect {
public:
OverlayEffect();
virtual bool needs_srgb_primaries() const { return false; }
virtual unsigned num_inputs() const { return 2; }
+ virtual bool one_to_one_sampling() const { return true; }
+
+ // Actually, if _either_ image has blank alpha, our output will have
+ // blank alpha, too (this only tells the framework that having _both_
+ // images with blank alpha would result in blank alpha).
+ // However, understanding that would require changes
+ // to EffectChain, so postpone that optimization for later.
+ virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+
+private:
+ // If true, overlays input1 on top of input2 instead of vice versa.
+ // Must be set before finalize.
+ bool swap_inputs;
};
-#endif // !defined(_OVERLAY_EFFECT_H)
+} // namespace movit
+
+#endif // !defined(_MOVIT_OVERLAY_EFFECT_H)