1 #ifndef _MOVIT_GAMMA_EXPANSION_EFFECT_H
2 #define _MOVIT_GAMMA_EXPANSION_EFFECT_H 1
4 // An effect to convert the given gamma curve into linear light,
5 // typically inserted by the framework automatically at the beginning
6 // of the processing chain.
8 // Currently supports sRGB, Rec. 601/709 and Rec. 2020 (10- and 12-bit).
13 #include "image_format.h"
15 class GammaExpansionEffect : public Effect {
17 // Should not be instantiated by end users.
18 GammaExpansionEffect();
19 friend class EffectChain;
22 virtual std::string effect_type_id() const { return "GammaExpansionEffect"; }
23 std::string output_fragment_shader();
24 virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
26 virtual bool needs_linear_light() const { return false; }
27 virtual bool needs_srgb_primaries() const { return false; }
29 // Actually processes its input in a nonlinear fashion,
30 // but does not touch alpha, and we are a special case anyway.
31 virtual AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
34 GammaCurve source_curve;
37 #endif // !defined(_MOVIT_GAMMA_EXPANSION_EFFECT_H)