Add a diffusion effect, and hook it up in the GUI.

[movit] / diffusion_effect.h

diff --git a/diffusion_effect.h b/diffusion_effect.h
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+#ifndef _DIFFUSION_EFFECT_H
+#define _DIFFUSION_EFFECT_H 1
+
+// There are many different effects that go under the name of "diffusion",
+// seemingly all of the inspired by the effect you get when you put a
+// diffusion filter in front of your camera lens. The effect most people
+// want is a general flattening/smoothing of the light, and reduction of
+// fine detail (most notably, blemishes in people's skin), without ruining
+// edges, which a regular blur would do.
+//
+// We do a relatively simple version, sometimes known as "white diffusion",
+// where we first blur the picture, and then overlay it on the original
+// using the original as a matte.
+
+#include "effect.h"
+
+class BlurEffect;
+class OverlayMatteEffect;
+
+class DiffusionEffect : public Effect {
+public:
+       DiffusionEffect();
+       std::string output_fragment_shader();
+
+       virtual void add_self_to_effect_chain(EffectChain *chain, const std::vector<Effect *> &input);
+       virtual bool set_float(const std::string &key, float value);
+
+private:
+       BlurEffect *blur;
+       OverlayMatteEffect *overlay_matte;
+};
+
+// Used internally by DiffusionEffect; combines the blurred and the original
+// version using the original as a matte.
+class OverlayMatteEffect : public Effect {
+public:
+       OverlayMatteEffect();
+       std::string output_fragment_shader();
+
+       unsigned num_inputs() const { return 2; }
+
+private:
+       float blurred_mix_amount;
+};
+
+
+#endif // !defined(_DIFFUSION_EFFECT_H)