-float lift_r = 0.0f, lift_g = 0.0f, lift_b = 0.0f;
-float gamma_r = 1.0f, gamma_g = 1.0f, gamma_b = 1.0f;
-float gain_r = 1.0f, gain_g = 1.0f, gain_b = 1.0f;
-
-enum PixelFormat { FORMAT_RGB, FORMAT_RGBA };
-
-enum ColorSpace {
- COLORSPACE_sRGB = 0,
- COLORSPACE_REC_709 = 0, // Same as sRGB.
- COLORSPACE_REC_601_525 = 1,
- COLORSPACE_REC_601_625 = 2,
-};
-
-enum GammaCurve {
- GAMMA_LINEAR = 0,
- GAMMA_sRGB = 1,
- GAMMA_REC_601 = 2,
- GAMMA_REC_709 = 2, // Same as Rec. 601.
-};
-
-struct ImageFormat {
- PixelFormat pixel_format;
- ColorSpace color_space;
- GammaCurve gamma_curve;
-};
-
-enum EffectId {
- // Mostly for internal use.
- GAMMA_CONVERSION = 0,
- RGB_PRIMARIES_CONVERSION,
-
- // Color.
- LIFT_GAMMA_GAIN,
-};
-
-// Can alias on a float[3].
-struct RGBTriplet {
- RGBTriplet(float r, float g, float b)
- : r(r), g(g), b(b) {}
-
- float r, g, b;
-};
-
-class GammaExpansionEffect : public Effect {
-public:
- GammaExpansionEffect()
- : source_curve(GAMMA_LINEAR)
- {
- register_int("source_curve", (int *)&source_curve);
- }
-
-private:
- GammaCurve source_curve;
-};
-
-class ColorSpaceConversionEffect : public Effect {
-public:
- ColorSpaceConversionEffect()
- : source_space(COLORSPACE_sRGB),
- destination_space(COLORSPACE_sRGB)
- {
- register_int("source_space", (int *)&source_space);
- register_int("destination_space", (int *)&destination_space);
- }
-
-private:
- ColorSpace source_space, destination_space;
-};
-
-class ColorSpaceConversionEffect;
-
-class LiftGammaGainEffect : public Effect {
-public:
- LiftGammaGainEffect()
- : lift(0.0f, 0.0f, 0.0f),
- gamma(1.0f, 1.0f, 1.0f),
- gain(1.0f, 1.0f, 1.0f),
- saturation(1.0f)
- {
- register_vec3("lift", (float *)&lift);
- register_vec3("gamma", (float *)&gamma);
- register_vec3("gain", (float *)&gain);
- register_float("saturation", &saturation);
- }
-
-private:
- RGBTriplet lift, gamma, gain;
- float saturation;
-};
-
-class EffectChain {
-public:
- EffectChain(unsigned width, unsigned height);
- void add_input(const ImageFormat &format);
-
- // The pointer is owned by EffectChain.
- 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;
-
- ColorSpace current_color_space;
- GammaCurve current_gamma_curve;
-};