-#ifndef _GAMMA_EXPANSION_EFFECT_H
-#define _GAMMA_EXPANSION_EFFECT_H 1
+#ifndef _MOVIT_GAMMA_EXPANSION_EFFECT_H
+#define _MOVIT_GAMMA_EXPANSION_EFFECT_H 1
+
+// An effect to convert the given gamma curve into linear light,
+// typically inserted by the framework automatically at the beginning
+// of the processing chain.
+//
+// Currently supports sRGB and Rec. 601/709.
+
+#include <string>
#include "effect.h"
-#include "effect_chain.h"
+#include "image_format.h"
#define EXPANSION_CURVE_SIZE 256
class GammaExpansionEffect : public Effect {
-public:
+private:
+ // Should not be instantiated by end users.
GammaExpansionEffect();
+ friend class EffectChain;
+
+public:
+ virtual std::string effect_type_id() const { return "GammaExpansionEffect"; }
std::string output_fragment_shader();
- virtual bool needs_linear_light() { return false; }
- virtual bool needs_srgb_primaries() { return false; }
+ virtual bool needs_linear_light() const { return false; }
+ virtual bool needs_srgb_primaries() const { return false; }
+
+ // Actually processes its input in a nonlinear fashion,
+ // but does not touch alpha, and we are a special case anyway.
+ virtual AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
private:
GammaCurve source_curve;
float expansion_curve[EXPANSION_CURVE_SIZE];
};
-#endif // !defined(_GAMMA_EXPANSION_EFFECT_H)
+#endif // !defined(_MOVIT_GAMMA_EXPANSION_EFFECT_H)