#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() 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];