-#ifndef _GLOW_EFFECT_H
-#define _GLOW_EFFECT_H 1
+#ifndef _MOVIT_GLOW_EFFECT_H
+#define _MOVIT_GLOW_EFFECT_H 1
-// Glow: Simply add a blurred version of the image to itself.
+// Glow: Cut out the highlights of the image (everything above a certain threshold),
+// blur them, and overlay them onto the original image.
+
+#include <epoxy/gl.h>
+#include <assert.h>
+#include <string>
#include "effect.h"
+namespace movit {
+
class BlurEffect;
+class EffectChain;
+class HighlightCutoffEffect;
class MixEffect;
+class Node;
class GlowEffect : public Effect {
public:
virtual bool needs_srgb_primaries() const { return false; }
- virtual void add_self_to_effect_chain(EffectChain *chain, const std::vector<Effect *> &input);
+ virtual void rewrite_graph(EffectChain *graph, Node *self);
virtual bool set_float(const std::string &key, float value);
virtual std::string output_fragment_shader() {
private:
BlurEffect *blur;
+ HighlightCutoffEffect *cutoff;
MixEffect *mix;
};
-#endif // !defined(_GLOW_EFFECT_H)
+// An effect that cuts out only the highlights of an image;
+// anything at the cutoff or below is set to 0.0, and then all other pixels
+// get the cutoff subtracted. Used only as part of GlowEffect.
+
+class HighlightCutoffEffect : public Effect {
+public:
+ HighlightCutoffEffect();
+ virtual std::string effect_type_id() const { return "HighlightCutoffEffect"; }
+ std::string output_fragment_shader();
+
+ virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+ virtual bool one_to_one_sampling() const { return true; }
+
+private:
+ float cutoff;
+};
+
+} // namespace movit
+
+#endif // !defined(_MOVIT_GLOW_EFFECT_H)