2 #define _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).
9 class MixEffect : public Effect {
12 virtual std::string effect_type_id() const { return "MixEffect"; }
13 std::string output_fragment_shader();
15 virtual bool needs_srgb_primaries() const { return false; }
16 virtual unsigned num_inputs() const { return 2; }
18 // TODO: In the common case where a+b=1, it would be useful to be able to set
19 // alpha_handling() to INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK. However, right now
20 // we have no way of knowing that at instantiation time.
23 float strength_first, strength_second;
26 #endif // !defined(_MIX_EFFECT_H)