1 #ifndef _MOVIT_GAMMA_COMPRESSION_EFFECT_H
2 #define _MOVIT_GAMMA_COMPRESSION_EFFECT_H 1
4 // An effect to convert linear light to the given gamma curve,
5 // typically inserted by the framework automatically at the end
6 // of the processing chain.
8 // Currently supports sRGB, Rec. 601/709 and Rec. 2020 (10- and 12-bit).
9 // Note that Movit's internal formats generally do not have enough accuracy
10 // for 12-bit input or output.
15 #include "image_format.h"
17 #define COMPRESSION_CURVE_SIZE 4096
19 class GammaCompressionEffect : public Effect {
21 // Should not be instantiated by end users.
22 GammaCompressionEffect();
23 friend class EffectChain;
26 virtual std::string effect_type_id() const { return "GammaCompressionEffect"; }
27 std::string output_fragment_shader();
29 virtual bool needs_srgb_primaries() const { return false; }
31 // Actually needs postmultiplied input as well as outputting it.
32 // EffectChain will take care of that.
33 virtual AlphaHandling alpha_handling() const { return OUTPUT_POSTMULTIPLIED_ALPHA; }
36 GammaCurve destination_curve;
37 float compression_curve[COMPRESSION_CURVE_SIZE];
40 #endif // !defined(_MOVIT_GAMMA_COMPRESSION_EFFECT_H)