filament_mixer Namespace Reference

Namespaces
namespace	detail

Classes
struct	RGB

Functions
void	lerp (unsigned char r1, unsigned char g1, unsigned char b1, unsigned char r2, unsigned char g2, unsigned char b2, float t, unsigned char *out_r, unsigned char *out_g, unsigned char *out_b)
RGB	lerp (unsigned char r1, unsigned char g1, unsigned char b1, unsigned char r2, unsigned char g2, unsigned char b2, float t)

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Class Documentation

filament_mixer::RGB

struct filament_mixer::RGB

Class Members
unsigned char	b
unsigned char	g
unsigned char	r

Function Documentation

lerp() [1/2]

RGB filament_mixer::lerp ( unsigned char r1, unsigned char g1, unsigned char b1, unsigned char r2, unsigned char g2, unsigned char b2, float t )

inline

Convenience overload returning an RGB struct.

                         {
    RGB result;
    lerp(r1, g1, b1, r2, g2, b2, t, &result.r, &result.g, &result.b);
    return result;
}

References filament_mixer::RGB::b, filament_mixer::RGB::g, lerp(), and filament_mixer::RGB::r.

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lerp() [2/2]

void filament_mixer::lerp ( unsigned char r1, unsigned char g1, unsigned char b1, unsigned char r2, unsigned char g2, unsigned char b2, float t, unsigned char * out_r, unsigned char * out_g, unsigned char * out_b )

inline

Mix two RGB colors using polynomial pigment mixing.

This performs polynomial pigment-style RGB interpolation.

Parameters

r1,g1,b1	First color (0-255)
r2,g2,b2	Second color (0-255)
t	Mixing ratio: 0.0 = all color1, 1.0 = all color2
out_r,out_g,out_b	Output color (0-255)

                                                                                   {
    // Clamp t
    if (t <= 0.0f) {
        *out_r = r1; *out_g = g1; *out_b = b1;
        return;
    }
    if (t >= 1.0f) {
        *out_r = r2; *out_g = g2; *out_b = b2;
        return;
    }
 
    double x[7] = {
        static_cast<double>(r1), static_cast<double>(g1), static_cast<double>(b1),
        static_cast<double>(r2), static_cast<double>(g2), static_cast<double>(b2),
        static_cast<double>(t)
    };
 
    double features[330];
    detail::compute_poly_features(x, features);
 
    // Dot product: features @ COEF + INTERCEPT
    for (int c = 0; c < 3; ++c) {
        double sum = detail::INTERCEPT[c];
        for (int i = 0; i < detail::N_FEATURES; ++i) {
            sum += features[i] * detail::COEF[i][c];
        }
        // Clamp to [0, 255] and truncate (matches numpy astype(int) behavior)
        int val = static_cast<int>(sum);
        if (val < 0) val = 0;
        if (val > 255) val = 255;
 
        if (c == 0) *out_r = static_cast<unsigned char>(val);
        else if (c == 1) *out_g = static_cast<unsigned char>(val);
        else *out_b = static_cast<unsigned char>(val);
    }
}

References filament_mixer::detail::COEF, filament_mixer::detail::compute_poly_features(), filament_mixer::detail::INTERCEPT, and filament_mixer::detail::N_FEATURES.

Referenced by Slic3r::filament_mixer_lerp(), and lerp().

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