-#ifndef _MIX_EFFECT_H
-#define _MIX_EFFECT_H 1
+#ifndef _MOVIT_MIX_EFFECT_H
+#define _MOVIT_MIX_EFFECT_H 1
-// Combine two images: a*x + b*y. (If you set a within [0,1] and b=1-a, you will get a fade.)
+// Combine two images: a*x + b*y. If you set a within [0,1] and b=1-a,
+// you will get a fade; if not, you may get surprising results (consider alpha).
+
+#include <string>
#include "effect.h"
+namespace movit {
+
class MixEffect : public Effect {
public:
MixEffect();
virtual bool needs_srgb_primaries() const { return false; }
virtual unsigned num_inputs() const { return 2; }
+ virtual bool one_to_one_sampling() const { return true; }
+
+ // TODO: In the common case where a+b=1, it would be useful to be able to set
+ // alpha_handling() to INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK. However, right now
+ // we have no way of knowing that at instantiation time.
private:
float strength_first, strength_second;
};
-#endif // !defined(_MIX_EFFECT_H)
+} // namespace movit
+
+#endif // !defined(_MOVIT_MIX_EFFECT_H)