1 #ifndef _MOVIT_MIX_EFFECT_H
2 #define _MOVIT_MIX_EFFECT_H 1
4 // Combine two images: a*x + b*y. If you set a within [0,1] and b=1-a,
5 // you will get a fade; if not, you may get surprising results (consider alpha).
13 class MixEffect : public Effect {
16 virtual std::string effect_type_id() const { return "MixEffect"; }
17 std::string output_fragment_shader();
19 virtual bool needs_srgb_primaries() const { return false; }
20 virtual unsigned num_inputs() const { return 2; }
22 // TODO: In the common case where a+b=1, it would be useful to be able to set
23 // alpha_handling() to INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK. However, right now
24 // we have no way of knowing that at instantiation time.
27 float strength_first, strength_second;
32 #endif // !defined(_MOVIT_MIX_EFFECT_H)