Add a new alpha handling method, INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK.

[movit] / mix_effect.h

diff --git a/mix_effect.h b/mix_effect.h
index c6739653b398b7cd9791af5361d32197dd3d8499..967c06b2ba59ac47b9ed21b7f1692f90bfdde854 100644 (file)
--- a/mix_effect.h
+++ b/mix_effect.h
@@ -15,6 +15,10 @@ public:
        virtual bool needs_srgb_primaries() const { return false; }
        virtual unsigned num_inputs() const { return 2; }
 
+       // 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;
 };