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 std::string effect_type_id() const override { return "MixEffect"; }
17 std::string output_fragment_shader() override;
19 bool needs_srgb_primaries() const override { return false; }
20 unsigned num_inputs() const override { return 2; }
21 bool strong_one_to_one_sampling() const override { return true; }
23 // TODO: In the common case where a+b=1, it would be useful to be able to set
24 // alpha_handling() to INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK. However, right now
25 // we have no way of knowing that at instantiation time.
28 float strength_first, strength_second;
33 #endif // !defined(_MOVIT_MIX_EFFECT_H)