+struct ImageFormat {
+ enum { FORMAT_RGB, FORMAT_RGBA } format;
+
+ // Note: sRGB and 709 use the same colorspace primaries.
+ enum { COLORSPACE_sRGB, COLORSPACE_REC_601_525, COLORSPACE_REC_601_625, COLORSPACE_REC_709 } color_space;
+
+ // Note: Rec. 601 and 709 use the same gamma curve.
+ enum { LINEAR_LIGHT, GAMMA_sRGB, GAMMA_REC_601, GAMMA_REC_709 } gamma_curve;
+};
+
+enum EffectId {
+ // Mostly for internal use.
+ GAMMA_CONVERSION = 0,
+ RGB_PRIMARIES_CONVERSION,
+
+ // Color.
+ LIFT_GAMMA_GAIN,
+};
+
+class Effect {
+public:
+ virtual bool needs_linear_light() { return true; }
+ virtual bool needs_srgb_primaries() { return true; }
+ virtual bool needs_many_samples() { return false; }
+ virtual bool needs_mipmaps() { return false; }
+ bool set_float(const std::string& key, float value);
+ bool set_float_array(const std::string&, const float *values, size_t num_values);
+
+private:
+ bool register_float(const std::string& key, float value);
+ bool register_float_array(const std::string& key, float *values, size_t num_values);
+};
+
+class EffectChain {
+public:
+ void set_size(unsigned width, unsigned height);
+ void add_input(const ImageFormat &format);
+ Effect *add_effect(EffectId effect);
+ void add_output(const ImageFormat &format);
+
+ void render(unsigned char *src, unsigned char *dst);
+
+private:
+ unsigned width, height;
+ ImageFormat input_format, output_format;
+ std::vector<Effect *> effects;
+};
+