-#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:
GlowEffect();
- virtual std::string effect_type_id() const { return "GlowEffect"; }
+ std::string effect_type_id() const override { return "GlowEffect"; }
- virtual bool needs_srgb_primaries() const { return false; }
+ bool needs_srgb_primaries() const override { return false; }
- virtual void add_self_to_effect_chain(EffectChain *chain, const std::vector<Effect *> &input);
- virtual bool set_float(const std::string &key, float value);
+ void rewrite_graph(EffectChain *graph, Node *self) override;
+ bool set_float(const std::string &key, float value) override;
- virtual std::string output_fragment_shader() {
+ std::string output_fragment_shader() override {
assert(false);
}
- virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) {
+ void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override {
assert(false);
}
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();
+ std::string effect_type_id() const override { return "HighlightCutoffEffect"; }
+ std::string output_fragment_shader() override;
+
+ AlphaHandling alpha_handling() const override { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+ bool strong_one_to_one_sampling() const override { return true; }
+
+private:
+ float cutoff;
+};
+
+} // namespace movit
+
+#endif // !defined(_MOVIT_GLOW_EFFECT_H)