X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=gamma_expansion_effect.h;h=e4a94b379c3960bacb3612db1742b3156c56b763;hp=f079e7085f6e7ba6f6721f8aa3142e9ddb2f88e6;hb=3bb4d84f2c3914ac815b1c3fbcdea0439aa30d74;hpb=2ced784c6599cb0b21427481ee17f4c8f6afdada

diff --git a/gamma_expansion_effect.h b/gamma_expansion_effect.h
index f079e70..e4a94b3 100644
--- a/gamma_expansion_effect.h
+++ b/gamma_expansion_effect.h
@@ -1,22 +1,39 @@
-#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, Rec. 601/709 and Rec. 2020 (10- and 12-bit).
+
+#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)