diff options
author | Paul Davis <paul@linuxaudiosystems.com> | 2014-11-19 13:14:26 -0500 |
---|---|---|
committer | Paul Davis <paul@linuxaudiosystems.com> | 2014-11-26 18:22:22 +0200 |
commit | 318a9edab99606d7fbf7eb21d816c7416c76b894 (patch) | |
tree | 52fbbb2c7e898bdc0369b9acf40e4cbee2618685 /libs | |
parent | e9768e934fdeaf31aaae779e42ff493a2e781179 (diff) |
massive reworking of color selection implementation
Diffstat (limited to 'libs')
-rw-r--r-- | libs/canvas/canvas/colors.h | 54 | ||||
-rw-r--r-- | libs/canvas/canvas/colorspace.h | 54 | ||||
-rw-r--r-- | libs/canvas/colors.cc | 247 | ||||
-rw-r--r-- | libs/canvas/colorspace.cc | 940 | ||||
-rw-r--r-- | libs/canvas/wave_view.cc | 2 | ||||
-rw-r--r-- | libs/canvas/wscript | 1 |
6 files changed, 1184 insertions, 114 deletions
diff --git a/libs/canvas/canvas/colors.h b/libs/canvas/canvas/colors.h index 17e93cf128..5e13c5ca96 100644 --- a/libs/canvas/canvas/colors.h +++ b/libs/canvas/canvas/colors.h @@ -31,34 +31,40 @@ namespace ArdourCanvas struct LIBCANVAS_API HSV; struct LIBCANVAS_API HSVA; -extern LIBCANVAS_API Color hsv_to_color (double h, double s, double v, double a = 1.0); -extern LIBCANVAS_API Color hsv_to_color (const HSV&, double a = 1.0); -extern LIBCANVAS_API Color hsva_to_color (const HSVA&); +extern LIBCANVAS_API Color hsva_to_color (double h, double s, double v, double a = 1.0); +extern LIBCANVAS_API void color_to_hsva (Color color, double& h, double& s, double& v, double& a); extern LIBCANVAS_API void color_to_hsv (Color color, double& h, double& s, double& v); - extern LIBCANVAS_API void color_to_rgba (Color, double& r, double& g, double& b, double& a); extern LIBCANVAS_API Color rgba_to_color (double r, double g, double b, double a); uint32_t LIBCANVAS_API contrasting_text_color (uint32_t c); -struct LIBCANVAS_API HSV +struct LIBCANVAS_API HSV { HSV (); - HSV (double h, double s, double v); + HSV (double h, double s, double v, double a = 1.0); HSV (Color); - virtual ~HSV() {} double h; double s; double v; + double a; - bool is_gray() const { return s == 0; } - - operator Color() const { return hsv_to_color (*this); } + bool is_gray() const; + + Color color() const { return hsva_to_color (h,s, v, a); } + operator Color() const { return color(); } HSV operator+ (const HSV&) const; HSV operator- (const HSV&) const; - HSV operator* (double) const; + + HSV& operator=(Color); + HSV& operator=(const std::string&); + + bool operator== (const HSV& other); + + double distance (const HSV& other) const; + HSV delta (const HSV& other) const; HSV darker (double factor = 1.3) const { return shade (factor); } HSV lighter (double factor = 0.7) const { return shade (factor); } @@ -66,26 +72,13 @@ struct LIBCANVAS_API HSV HSV shade (double factor) const; HSV mix (const HSV& other, double amt) const; - void print (std::ostream&) const; - - protected: - virtual void clamp(); -}; - - - -struct LIBCANVAS_API HSVA : public HSV -{ - HSVA (); - HSVA (double h, double s, double v, double a); - HSVA (Color); - - double a; - - operator Color() const { return hsva_to_color (*this); } + HSV opposite() const; + HSV complement() const { return opposite(); } - HSVA operator+ (const HSVA&) const; - HSVA operator- (const HSVA&) const; + HSV bw_text () const; + HSV text() const; + HSV selected () const; + HSV outline() const; void print (std::ostream&) const; @@ -96,6 +89,5 @@ struct LIBCANVAS_API HSVA : public HSV } std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSV& hsv); -std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSVA& hsva); #endif /* __ardour_canvas_colors_h__ */ diff --git a/libs/canvas/canvas/colorspace.h b/libs/canvas/canvas/colorspace.h new file mode 100644 index 0000000000..445b7e2c63 --- /dev/null +++ b/libs/canvas/canvas/colorspace.h @@ -0,0 +1,54 @@ +/** + * @file colorspace.h + * @author Pascal Getreuer 2005-2010 <getreuer@gmail.com> + */ + +#ifndef _ARDOURCANVAS_COLORSPACE_H_ +#define _ARDOURCANVAS_COLORSPACE_H_ + +/** @brief XYZ color of the D65 white point */ +#define WHITEPOINT_X 0.950456 +#define WHITEPOINT_Y 1.0 +#define WHITEPOINT_Z 1.088754 + +void Rgb2Yuv(double *Y, double *U, double *V, double R, double G, double B); +void Yuv2Rgb(double *R, double *G, double *B, double Y, double U, double V); +void Rgb2Ycbcr(double *Y, double *Cb, double *Cr, double R, double G, double B); +void Ycbcr2Rgb(double *R, double *G, double *B, double Y, double Cb, double Cr); +void Rgb2Jpegycbcr(double *R, double *G, double *B, double Y, double Cb, double Cr); +void Jpegycbcr2Rgb(double *R, double *G, double *B, double Y, double Cb, double Cr); +void Rgb2Ypbpr(double *Y, double *Pb, double *Pr, double R, double G, double B); +void Ypbpr2Rgb(double *R, double *G, double *B, double Y, double Pb, double Pr); +void Rgb2Ydbdr(double *Y, double *Db, double *Dr, double R, double G, double B); +void Ydbdr2Rgb(double *R, double *G, double *B, double Y, double Db, double Dr); +void Rgb2Yiq(double *Y, double *I, double *Q, double R, double G, double B); +void Yiq2Rgb(double *R, double *G, double *B, double Y, double I, double Q); + +void Rgb2Hsv(double *H, double *S, double *V, double R, double G, double B); +void Hsv2Rgb(double *R, double *G, double *B, double H, double S, double V); +void Rgb2Hsl(double *H, double *S, double *L, double R, double G, double B); +void Hsl2Rgb(double *R, double *G, double *B, double H, double S, double L); +void Rgb2Hsi(double *H, double *S, double *I, double R, double G, double B); +void Hsi2Rgb(double *R, double *G, double *B, double H, double S, double I); + +void Rgb2Xyz(double *X, double *Y, double *Z, double R, double G, double B); +void Xyz2Rgb(double *R, double *G, double *B, double X, double Y, double Z); +void Xyz2Lab(double *L, double *a, double *b, double X, double Y, double Z); +void Lab2Xyz(double *X, double *Y, double *Z, double L, double a, double b); +void Xyz2Luv(double *L, double *u, double *v, double X, double Y, double Z); +void Luv2Xyz(double *X, double *Y, double *Z, double L, double u, double v); +void Xyz2Lch(double *L, double *C, double *H, double X, double Y, double Z); +void Lch2Xyz(double *X, double *Y, double *Z, double L, double C, double H); +void Xyz2Cat02lms(double *L, double *M, double *S, double X, double Y, double Z); +void Cat02lms2Xyz(double *X, double *Y, double *Z, double L, double M, double S); + +void Rgb2Lab(double *L, double *a, double *b, double R, double G, double B); +void Lab2Rgb(double *R, double *G, double *B, double L, double a, double b); +void Rgb2Luv(double *L, double *u, double *v, double R, double G, double B); +void Luv2Rgb(double *R, double *G, double *B, double L, double u, double v); +void Rgb2Lch(double *L, double *C, double *H, double R, double G, double B); +void Lch2Rgb(double *R, double *G, double *B, double L, double C, double H); +void Rgb2Cat02lms(double *L, double *M, double *S, double R, double G, double B); +void Cat02lms2Rgb(double *R, double *G, double *B, double L, double M, double S); + +#endif /* _ARDOURCANVAS_COLORSPACE_H_ */ diff --git a/libs/canvas/colors.cc b/libs/canvas/colors.cc index a3a7565fc8..7be91c1c6f 100644 --- a/libs/canvas/colors.cc +++ b/libs/canvas/colors.cc @@ -21,6 +21,7 @@ #include <stdint.h> #include "canvas/colors.h" +#include "canvas/colorspace.h" using namespace std; using namespace ArdourCanvas; @@ -31,7 +32,14 @@ using std::min; void ArdourCanvas::color_to_hsv (Color color, double& h, double& s, double& v) { - double r, g, b, a; + double a; + color_to_hsva (color, h, s, v, a); +} + +void +ArdourCanvas::color_to_hsva (Color color, double& h, double& s, double& v, double& a) +{ + double r, g, b; double cmax; double cmin; double delta; @@ -57,7 +65,8 @@ ArdourCanvas::color_to_hsv (Color color, double& h, double& s, double& v) if (cmax == 0) { // r = g = b == 0 ... v is undefined, s = 0 s = 0.0; - h = -1.0; + h = 0.0; + return; } if (delta != 0.0) { @@ -70,6 +79,13 @@ ArdourCanvas::color_to_hsv (Color color, double& h, double& s, double& v) } h *= 60.0; + + if (h < 0.0) { + /* negative values are legal but confusing, because + they alias positive values. + */ + h = 360 + h; + } } if (delta == 0 || cmax == 0) { @@ -80,23 +96,16 @@ ArdourCanvas::color_to_hsv (Color color, double& h, double& s, double& v) } ArdourCanvas::Color -ArdourCanvas::hsv_to_color (const HSV& hsv, double a) -{ - return hsv_to_color (hsv.h, hsv.s, hsv.v, a); -} - -ArdourCanvas::Color -ArdourCanvas::hsv_to_color (double h, double s, double v, double a) +ArdourCanvas::hsva_to_color (double h, double s, double v, double a) { s = min (1.0, max (0.0, s)); v = min (1.0, max (0.0, v)); if (s == 0) { - // achromatic (grey) return rgba_to_color (v, v, v, a); } - h = min (360.0, max (0.0, h)); + h = fmod (h + 360.0, 360.0); double c = v * s; double x = c * (1.0 - fabs(fmod(h / 60.0, 2) - 1.0)); @@ -197,31 +206,50 @@ ArdourCanvas::contrasting_text_color (uint32_t c) return (luminance (c) < 0.50) ? white : black; } + + HSV::HSV () - : h (1.0) + : h (0.0) , s (1.0) , v (1.0) + , a (1.0) { } -HSV::HSV (double hh, double ss, double vv) +HSV::HSV (double hh, double ss, double vv, double aa) : h (hh) , s (ss) , v (vv) + , a (aa) { + if (h < 0.0) { + /* normalize negative hue values into positive range */ + h = 360.0 + h; + } } HSV::HSV (Color c) { - color_to_hsv (c, h, s, v); + color_to_hsva (c, h, s, v, a); +} + +bool +HSV::is_gray () const +{ + return s == 0; } void HSV::clamp () { - s = min (s, 1.0); - v = min (v, 1.0); - h = min (255.0, h); + h = fmod (h, 360.0); + if (h < 0.0) { + /* normalize negative hue values into positive range */ + h = 360.0 + h; + } + s = min (1.0, s); + v = min (1.0, v); + a = min (1.0, a); } HSV @@ -231,7 +259,8 @@ HSV::operator+ (const HSV& operand) const hsv.h = h + operand.h; hsv.s = s + operand.s; hsv.v = v + operand.v; - hsv.clamp(); + hsv.a = a + operand.a; + hsv.clamp (); return hsv; } @@ -241,20 +270,37 @@ HSV::operator- (const HSV& operand) const HSV hsv; hsv.h = h - operand.h; hsv.s = s - operand.s; - hsv.v = v - operand.v; - hsv.clamp(); + hsv.v = s - operand.v; + hsv.a = a - operand.a; + hsv.clamp (); return hsv; } -HSV -HSV::operator* (double d) const +HSV& +HSV::operator=(Color c) { - HSV hsv; - hsv.h = h * d; - hsv.s = s * d; - hsv.v = v * d; - hsv.clamp(); - return hsv; + color_to_hsva (c, h, s, v, a); + clamp (); + return *this; +} + +HSV& +HSV::operator=(const std::string& str) +{ + uint32_t c; + c = strtol (str.c_str(), 0, 16); + color_to_hsva (c, h, s, v, a); + clamp (); + return *this; +} + +bool +HSV::operator== (const HSV& other) +{ + return h == other.h && + s == other.s && + v == other.v && + a == other.a; } HSV @@ -274,16 +320,14 @@ HSV::shade (double factor) const if (factor > 1.0) { if (s < 88) { - hsv.v *= 1.0/(factor/10.0); - } else { - hsv.s *= factor; - } + hsv.v += (hsv.v * (factor * 10.0)); + } + hsv.s *= factor; } else { if (s < 88) { - hsv.v *= 1.0/factor; - } else { - hsv.s *= factor; - } + hsv.v -= (hsv.v * (factor * 10.0)); + } + hsv.s *= factor; } hsv.clamp(); @@ -292,6 +336,18 @@ HSV::shade (double factor) const } HSV +HSV::outline () const +{ + if (luminance (color()) < 0.50) { + /* light color, darker outline: black with 15% opacity */ + return HSV (0.0, 0.0, 0.0, 0.15); + } else { + /* dark color, lighter outline: white with 15% opacity */ + return HSV (0.0, 0.0, 1.0, 0.15); + } +} + +HSV HSV::mix (const HSV& other, double amount) const { HSV hsv; @@ -305,77 +361,104 @@ HSV::mix (const HSV& other, double amount) const return hsv; } -void -HSV::print (std::ostream& o) const +HSV +HSV::delta (const HSV& other) const { - if (!is_gray()) { - o << "hsv " << h << '|' << s << '|' << v; - } else { - o << "hsv gray"; - } + HSV d; + d.h = h - other.h; + d.s = s - other.s; + d.v = v - other.v; + /* do not clamp - we are returning a delta */ + return d; } -HSVA::HSVA () - : a (1.0) +double +HSV::distance (const HSV& other) const { -} + /* Use CIE94 definition for now */ -HSVA::HSVA (double hh, double ss, double vv, double aa) - : HSV (hh, ss, vv) - , a (aa) -{ + double sL, sA, sB; + double oL, oA, oB; + double r, g, b, a; + Color c; + + c = hsva_to_color (h, s, v, a); + color_to_rgba (c, r, g, b, a); + Rgb2Lab (&sL, &sA, &sB, r, g, b); + + c = hsva_to_color (other.h, other.s, other.v, other.a); + color_to_rgba (c, r, g, b, a); + Rgb2Lab (&oL, &oA, &oB, r, g, b); + + // Weighting factors depending on the application (1 = default) + + const double whtL = 1.0; + const double whtC = 1.0; + const double whtH = 1.0; + + const double xC1 = sqrt ((sA * sA) + (sB * oB)); + const double xC2 = sqrt ((oA * oA) + (oB * oB)); + double xDL = oL - sL; + double xDC = xC2 - xC1; + const double xDE = sqrt (((sL - oL) * (sL - oL)) + + ((sA - oA) * (sA - oA)) + + ((sB - oB) * (sB - oB))); + + double xDH; + + if (sqrt (xDE) > (sqrt (abs (xDL)) + sqrt (abs (xDC)))) { + xDH = sqrt ((xDE * xDE) - (xDL * xDL) - (xDC * xDC)); + } else { + xDH = 0; + } + + const double xSC = 1 + (0.045 * xC1); + const double xSH = 1 + (0.015 * xC1); + + xDL /= whtL; + xDC /= whtC * xSC; + xDH /= whtH * xSH; + + return sqrt ((xDL * xDL) + (xDC * xDC) + (xDH * xDH)); } -HSVA::HSVA (Color c) +HSV +HSV::opposite () const { - color_to_hsv (c, h, s, v); - a = c & 0xff; + HSV hsv (*this); + hsv.h = fmod (h + 180.0, 360.0); + return hsv; } -void -HSVA::clamp () +HSV +HSV::bw_text () const { - HSV::clamp (); - a = min (1.0, a); + return HSV (contrasting_text_color (color())); } -HSVA -HSVA::operator+ (const HSVA& operand) const +HSV +HSV::text () const { - HSVA hsv; - hsv.h = h + operand.h; - hsv.s = s + operand.s; - hsv.v = v + operand.v; - hsv.a = a + operand.a; - return hsv; + return opposite (); } -HSVA -HSVA::operator- (const HSVA& operand) const +HSV +HSV::selected () const { - HSVA hsv; - hsv.h = h - operand.h; - hsv.s = s - operand.s; - hsv.a = a - operand.a; - return hsv; + /* XXX hack */ + return HSV (Color (0xff0000)); } + void -HSVA::print (std::ostream& o) const +HSV::print (std::ostream& o) const { if (!is_gray()) { - o << "hsva " << h << '|' << s << '|' << v << '|' << a; + o << '(' << s << ',' << v << ',' << a << ')'; } else { - o << "hsva gray"; + o << "gray(" << v << ')'; } } -ArdourCanvas::Color -ArdourCanvas::hsva_to_color (const HSVA& hsva) -{ - return hsv_to_color (hsva.h, hsva.s, hsva.v, hsva.a); -} - std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSV& hsv) { hsv.print (o); return o; } -std::ostream& operator<<(std::ostream& o, const ArdourCanvas::HSVA& hsva) { hsva.print (o); return o; } diff --git a/libs/canvas/colorspace.cc b/libs/canvas/colorspace.cc new file mode 100644 index 0000000000..5a71b715be --- /dev/null +++ b/libs/canvas/colorspace.cc @@ -0,0 +1,940 @@ +/** + * @file colorspace.c + * @author Pascal Getreuer 2005-2010 <getreuer@gmail.com> + * + * == Summary == + * This file implements routines for color transformations between the spaces + * sRGB, Y'UV, Y'CbCr, Y'PbPr, Y'DbDr, Y'IQ, HSV, HSL, HSI, CIEXYZ, CIELAB, + * CIELUV, CIELCH, and CIECAT02 LMS. + * + * == Usage == + * First call GetColorTransform, specifying the source and destination color + * spaces as "dest<-src" or "src->dest". Then call ApplyColorTransform to + * perform the transform: +@code + double S[3] = {173, 0.8, 0.5}; + double D[3]; + colortransform Trans; + + if(!(GetColorTransform(&Trans, "HSI -> Lab"))) + { + printf("Invalid syntax or unknown color space\n"); + return; + } + + ApplyColorTransform(Trans, &D[0], &D[1], &D[2], S[0], S[1], S[2]); +@endcode + * "num" is a typedef defined at the beginning of colorspace.h that may be set + * to either double or float, depending on the application. + * + * Specific transformation routines can also be called directly. The following + * converts an sRGB color to CIELAB and then back to sRGB: +@code + double R = 0.85, G = 0.32, B = 0.5; + double L, a, b; + Rgb2Lab(&L, &a, &b, R, G, B); + Lab2Rgb(&R, &G, &B, L, a, b); +@endcode + * Generally, the calling syntax is +@code + Foo2Bar(&B0, &B1, &B2, F0, F1, F2); +@endcode + * where (F0,F1,F2) are the coordinates of a color in space "Foo" and + * (B0,B1,B2) are the transformed coordinates in space "Bar." For any + * transformation routine, its inverse has the sytax +@code + Bar2Foo(&F0, &F1, &F2, B0, B1, B2); +@endcode + * + * The conversion routines are consistently named with the first letter of a + * color space capitalized with following letters in lower case and omitting + * prime symbols. For example, "Rgb2Ydbdr" converts sRGB to Y'DbDr. For + * any transformation routine Foo2Bar, its inverse is Bar2Foo. + * + * All transformations assume a two degree observer angle and a D65 illuminant. + * The white point can be changed by modifying the WHITEPOINT_X, WHITEPOINT_Y, + * WHITEPOINT_Z definitions at the beginning of colorspace.h. + * + * == List of transformation routines == + * - Rgb2Yuv(double *Y, double *U, double *V, double R, double G, double B) + * - Rgb2Ycbcr(double *Y, double *Cb, double *Cr, double R, double G, double B) + * - Rgb2Jpegycbcr(double *Y, double *Cb, double *Cr, double R, double G, double B) + * - Rgb2Ypbpr(double *Y, double *Pb, double *Pr, double R, double G, double B) + * - Rgb2Ydbdr(double *Y, double *Db, double *Dr, double R, double G, double B) + * - Rgb2Yiq(double *Y, double *I, double *Q, double R, double G, double B) + * - Rgb2Hsv(double *H, double *S, double *V, double R, double G, double B) + * - Rgb2Hsl(double *H, double *S, double *L, double R, double G, double B) + * - Rgb2Hsi(double *H, double *S, double *I, double R, double G, double B) + * - Rgb2Xyz(double *X, double *Y, double *Z, double R, double G, double B) + * - Xyz2Lab(double *L, double *a, double *b, double X, double Y, double Z) + * - Xyz2Luv(double *L, double *u, double *v, double X, double Y, double Z) + * - Xyz2Lch(double *L, double *C, double *h, double X, double Y, double Z) + * - Xyz2Cat02lms(double *L, double *M, double *S, double X, double Y, double Z) + * - Rgb2Lab(double *L, double *a, double *b, double R, double G, double B) + * - Rgb2Luv(double *L, double *u, double *v, double R, double G, double B) + * - Rgb2Lch(double *L, double *C, double *h, double R, double G, double B) + * - Rgb2Cat02lms(double *L, double *M, double *S, double R, double G, double B) + * (Similarly for the inverse transformations.) + * + * It is possible to transform between two arbitrary color spaces by first + * transforming from the source space to sRGB and then transforming from + * sRGB to the desired destination space. For transformations between CIE + * color spaces, it is convenient to use XYZ as the intermediate space. This + * is the strategy used by GetColorTransform and ApplyColorTransform. + * + * == References == + * The definitions of these spaces and the many of the transformation formulas + * can be found in + * + * Poynton, "Frequently Asked Questions About Gamma" + * http://www.poynton.com/notes/colour_and_gamma/GammaFAQ.html + * + * Poynton, "Frequently Asked Questions About Color" + * http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html + * + * and Wikipedia articles + * http://en.wikipedia.org/wiki/SRGB + * http://en.wikipedia.org/wiki/YUV + * http://en.wikipedia.org/wiki/YCbCr + * http://en.wikipedia.org/wiki/YPbPr + * http://en.wikipedia.org/wiki/YDbDr + * http://en.wikipedia.org/wiki/YIQ + * http://en.wikipedia.org/wiki/HSL_and_HSV + * http://en.wikipedia.org/wiki/CIE_1931_color_space + * http://en.wikipedia.org/wiki/Lab_color_space + * http://en.wikipedia.org/wiki/CIELUV_color_space + * http://en.wikipedia.org/wiki/LMS_color_space + * + * == License (BSD) == + * Copyright (c) 2005-2010, Pascal Getreuer + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +#include <math.h> +#include <stdio.h> +#include <string.h> +#include <ctype.h> + +#include "canvas/colorspace.h" + +/** @brief Min of A and B */ +#define MIN(A,B) (((A) <= (B)) ? (A) : (B)) + +/** @brief Max of A and B */ +#define MAX(A,B) (((A) >= (B)) ? (A) : (B)) + +/** @brief Min of A, B, and C */ +#define MIN3(A,B,C) (((A) <= (B)) ? MIN(A,C) : MIN(B,C)) + +/** @brief Max of A, B, and C */ +#define MAX3(A,B,C) (((A) >= (B)) ? MAX(A,C) : MAX(B,C)) + +#ifndef M_PI +/** @brief The constant pi */ +#define M_PI 3.14159265358979323846264338327950288 +#endif + +/** + * @brief sRGB gamma correction, transforms R to R' + * http://en.wikipedia.org/wiki/SRGB + */ +#define GAMMACORRECTION(t) \ + (((t) <= 0.0031306684425005883) ? \ + (12.92*(t)) : (1.055*pow((t), 0.416666666666666667) - 0.055)) + +/** + * @brief Inverse sRGB gamma correction, transforms R' to R + */ +#define INVGAMMACORRECTION(t) \ + (((t) <= 0.0404482362771076) ? \ + ((t)/12.92) : pow(((t) + 0.055)/1.055, 2.4)) + +/** + * @brief CIE L*a*b* f function (used to convert XYZ to L*a*b*) + * http://en.wikipedia.org/wiki/Lab_color_space + */ +#define LABF(t) \ + ((t >= 8.85645167903563082e-3) ? \ + pow(t,0.333333333333333) : (841.0/108.0)*(t) + (4.0/29.0)) + +/** + * @brief CIE L*a*b* inverse f function + * http://en.wikipedia.org/wiki/Lab_color_space + */ +#define LABINVF(t) \ + ((t >= 0.206896551724137931) ? \ + ((t)*(t)*(t)) : (108.0/841.0)*((t) - (4.0/29.0))) + +/** @brief u'v' coordinates of the white point for CIE Lu*v* */ +#define WHITEPOINT_U ((4*WHITEPOINT_X) \ + /(WHITEPOINT_X + 15*WHITEPOINT_Y + 3*WHITEPOINT_Z)) +#define WHITEPOINT_V ((9*WHITEPOINT_Y) \ + /(WHITEPOINT_X + 15*WHITEPOINT_Y + 3*WHITEPOINT_Z)) + +/** @brief Enumeration of the supported color spaces */ +#define UNKNOWN_SPACE 0 +#define RGB_SPACE 1 +#define YUV_SPACE 2 +#define YCBCR_SPACE 3 +#define JPEGYCBCR_SPACE 4 +#define YPBPR_SPACE 5 +#define YDBDR_SPACE 6 +#define YIQ_SPACE 7 +#define HSV_SPACE 8 +#define HSL_SPACE 9 +#define HSI_SPACE 10 +#define XYZ_SPACE 11 +#define LAB_SPACE 12 +#define LUV_SPACE 13 +#define LCH_SPACE 14 +#define CAT02LMS_SPACE 15 + +#define NUM_TRANSFORM_PAIRS 18 + + + +/* + * == Linear color transformations == + * + * The following routines implement transformations between sRGB and + * the linearly-related color spaces Y'UV, Y'PbPr, Y'DbDr, and Y'IQ. + */ + + +/** + * @brief Convert sRGB to NTSC/PAL Y'UV Luma + Chroma + * + * @param Y, U, V pointers to hold the result + * @param R, G, B the input sRGB values + * + * Wikipedia: http://en.wikipedia.org/wiki/YUV + */ +void Rgb2Yuv(double *Y, double *U, double *V, double R, double G, double B) +{ + *Y = (double)( 0.299*R + 0.587*G + 0.114*B); + *U = (double)(-0.147*R - 0.289*G + 0.436*B); + *V = (double)( 0.615*R - 0.515*G - 0.100*B); +} + + +/** + * @brief Convert NTSC/PAL Y'UV to sRGB + * + * @param R, G, B pointers to hold the result + * @param Y, U, V the input YUV values + */ +void Yuv2Rgb(double *R, double *G, double *B, double Y, double U, double V) +{ + *R = (double)(Y - 3.945707070708279e-05*U + 1.1398279671717170825*V); + *G = (double)(Y - 0.3946101641414141437*U - 0.5805003156565656797*V); + *B = (double)(Y + 2.0319996843434342537*U - 4.813762626262513e-04*V); +} + + +/** @brief sRGB to Y'CbCr Luma + Chroma */ +void Rgb2Ycbcr(double *Y, double *Cb, double *Cr, double R, double G, double B) +{ + *Y = (double)( 65.481*R + 128.553*G + 24.966*B + 16); + *Cb = (double)(-37.797*R - 74.203*G + 112.0 *B + 128); + *Cr = (double)(112.0 *R - 93.786*G - 18.214*B + 128); +} + + +/** @brief Y'CbCr to sRGB */ +void Ycbcr2Rgb(double *R, double *G, double *B, double Y, double Cr, double Cb) +{ + Y -= 16; + Cb -= 128; + Cr -= 128; + *R = (double)(0.00456621004566210107*Y + 1.1808799897946415e-09*Cr + 0.00625892896994393634*Cb); + *G = (double)(0.00456621004566210107*Y - 0.00153632368604490212*Cr - 0.00318811094965570701*Cb); + *B = (double)(0.00456621004566210107*Y + 0.00791071623355474145*Cr + 1.1977497040190077e-08*Cb); +} + + +/** @brief sRGB to JPEG-Y'CbCr Luma + Chroma */ +void Rgb2Jpegycbcr(double *Y, double *Cb, double *Cr, double R, double G, double B) +{ + Rgb2Ypbpr(Y, Cb, Cr, R, G, B); + *Cb += (double)0.5; + *Cr += (double)0.5; +} + +/** @brief JPEG-Y'CbCr to sRGB */ +void Jpegycbcr2Rgb(double *R, double *G, double *B, double Y, double Cb, double Cr) +{ + Cb -= (double)0.5; + Cr -= (double)0.5; + Ypbpr2Rgb(R, G, B, Y, Cb, Cr); +} + + +/** @brief sRGB to Y'PbPr Luma (ITU-R BT.601) + Chroma */ +void Rgb2Ypbpr(double *Y, double *Pb, double *Pr, double R, double G, double B) +{ + *Y = (double)( 0.299 *R + 0.587 *G + 0.114 *B); + *Pb = (double)(-0.1687367*R - 0.331264*G + 0.5 *B); + *Pr = (double)( 0.5 *R - 0.418688*G - 0.081312*B); +} + + +/** @brief Y'PbPr to sRGB */ +void Ypbpr2Rgb(double *R, double *G, double *B, double Y, double Pb, double Pr) +{ + *R = (double)(0.99999999999914679361*Y - 1.2188941887145875e-06*Pb + 1.4019995886561440468*Pr); + *G = (double)(0.99999975910502514331*Y - 0.34413567816504303521*Pb - 0.71413649331646789076*Pr); + *B = (double)(1.00000124040004623180*Y + 1.77200006607230409200*Pb + 2.1453384174593273e-06*Pr); +} + + +/** @brief sRGB to SECAM Y'DbDr Luma + Chroma */ +void Rgb2Ydbdr(double *Y, double *Db, double *Dr, double R, double G, double B) +{ + *Y = (double)( 0.299*R + 0.587*G + 0.114*B); + *Db = (double)(-0.450*R - 0.883*G + 1.333*B); + *Dr = (double)(-1.333*R + 1.116*G + 0.217*B); +} + + +/** @brief SECAM Y'DbDr to sRGB */ +void Ydbdr2Rgb(double *R, double *G, double *B, double Y, double Db, double Dr) +{ + *R = (double)(Y + 9.2303716147657e-05*Db - 0.52591263066186533*Dr); + *G = (double)(Y - 0.12913289889050927*Db + 0.26789932820759876*Dr); + *B = (double)(Y + 0.66467905997895482*Db - 7.9202543533108e-05*Dr); +} + + +/** @brief sRGB to NTSC YIQ */ +void Rgb2Yiq(double *Y, double *I, double *Q, double R, double G, double B) +{ + *Y = (double)(0.299 *R + 0.587 *G + 0.114 *B); + *I = (double)(0.595716*R - 0.274453*G - 0.321263*B); + *Q = (double)(0.211456*R - 0.522591*G + 0.311135*B); +} + + +/** @brief Convert NTSC YIQ to sRGB */ +void Yiq2Rgb(double *R, double *G, double *B, double Y, double I, double Q) +{ + *R = (double)(Y + 0.9562957197589482261*I + 0.6210244164652610754*Q); + *G = (double)(Y - 0.2721220993185104464*I - 0.6473805968256950427*Q); + *B = (double)(Y - 1.1069890167364901945*I + 1.7046149983646481374*Q); +} + + + +/* + * == Hue Saturation Value/Lightness/Intensity color transformations == + * + * The following routines implement transformations between sRGB and + * color spaces HSV, HSL, and HSI. + */ + + +/** + * @brief Convert an sRGB color to Hue-Saturation-Value (HSV) + * + * @param H, S, V pointers to hold the result + * @param R, G, B the input sRGB values scaled in [0,1] + * + * This routine transforms from sRGB to the hexcone HSV color space. The + * sRGB values are assumed to be between 0 and 1. The output values are + * H = hexagonal hue angle (0 <= H < 360), + * S = C/V (0 <= S <= 1), + * V = max(R',G',B') (0 <= V <= 1), + * where C = max(R',G',B') - min(R',G',B'). The inverse color transformation + * is given by Hsv2Rgb. + * + * Wikipedia: http://en.wikipedia.org/wiki/HSL_and_HSV + */ +void Rgb2Hsv(double *H, double *S, double *V, double R, double G, double B) +{ + double Max = MAX3(R, G, B); + double Min = MIN3(R, G, B); + double C = Max - Min; + + + *V = Max; + + if(C > 0) + { + if(Max == R) + { + *H = (G - B) / C; + + if(G < B) + *H += 6; + } + else if(Max == G) + *H = 2 + (B - R) / C; + else + *H = 4 + (R - G) / C; + + *H *= 60; + *S = C / Max; + } + else + *H = *S = 0; +} + + +/** + * @brief Convert a Hue-Saturation-Value (HSV) color to sRGB + * + * @param R, G, B pointers to hold the result + * @param H, S, V the input HSV values + * + * The input values are assumed to be scaled as + * 0 <= H < 360, + * 0 <= S <= 1, + * 0 <= V <= 1. + * The output sRGB values are scaled between 0 and 1. This is the inverse + * transformation of Rgb2Hsv. + * + * Wikipedia: http://en.wikipedia.org/wiki/HSL_and_HSV + */ +void Hsv2Rgb(double *R, double *G, double *B, double H, double S, double V) +{ + double C = S * V; + double Min = V - C; + double X; + + + H -= 360*floor(H/360); + H /= 60; + X = C*(1 - fabs(H - 2*floor(H/2) - 1)); + + switch((int)H) + { + case 0: + *R = Min + C; + *G = Min + X; + *B = Min; + break; + case 1: + *R = Min + X; + *G = Min + C; + *B = Min; + break; + case 2: + *R = Min; + *G = Min + C; + *B = Min + X; + break; + case 3: + *R = Min; + *G = Min + X; + *B = Min + C; + break; + case 4: + *R = Min + X; + *G = Min; + *B = Min + C; + break; + case 5: + *R = Min + C; + *G = Min; + *B = Min + X; + break; + default: + *R = *G = *B = 0; + } +} + + +/** + * @brief Convert an sRGB color to Hue-Saturation-Lightness (HSL) + * + * @param H, S, L pointers to hold the result + * @param R, G, B the input sRGB values scaled in [0,1] + * + * This routine transforms from sRGB to the double hexcone HSL color space + * The sRGB values are assumed to be between 0 and 1. The outputs are + * H = hexagonal hue angle (0 <= H < 360), + * S = { C/(2L) if L <= 1/2 (0 <= S <= 1), + * { C/(2 - 2L) if L > 1/2 + * L = (max(R',G',B') + min(R',G',B'))/2 (0 <= L <= 1), + * where C = max(R',G',B') - min(R',G',B'). The inverse color transformation + * is given by Hsl2Rgb. + * + * Wikipedia: http://en.wikipedia.org/wiki/HSL_and_HSV + */ +void Rgb2Hsl(double *H, double *S, double *L, double R, double G, double B) +{ + double Max = MAX3(R, G, B); + double Min = MIN3(R, G, B); + double C = Max - Min; + + + *L = (Max + Min)/2; + + if(C > 0) + { + if(Max == R) + { + *H = (G - B) / C; + + if(G < B) + *H += 6; + } + else if(Max == G) + *H = 2 + (B - R) / C; + else + *H = 4 + (R - G) / C; + + *H *= 60; + *S = (*L <= 0.5) ? (C/(2*(*L))) : (C/(2 - 2*(*L))); + } + else + *H = *S = 0; +} + + +/** + * @brief Convert a Hue-Saturation-Lightness (HSL) color to sRGB + * + * @param R, G, B pointers to hold the result + * @param H, S, L the input HSL values + * + * The input values are assumed to be scaled as + * 0 <= H < 360, + * 0 <= S <= 1, + * 0 <= L <= 1. + * The output sRGB values are scaled between 0 and 1. This is the inverse + * transformation of Rgb2Hsl. + * + * Wikipedia: http://en.wikipedia.org/wiki/HSL_and_HSV + */ +void Hsl2Rgb(double *R, double *G, double *B, double H, double S, double L) +{ + double C = (L <= 0.5) ? (2*L*S) : ((2 - 2*L)*S); + double Min = L - 0.5*C; + double X; + + + H -= 360*floor(H/360); + H /= 60; + X = C*(1 - fabs(H - 2*floor(H/2) - 1)); + + switch((int)H) + { + case 0: + *R = Min + C; + *G = Min + X; + *B = Min; + break; + case 1: + *R = Min + X; + *G = Min + C; + *B = Min; + break; + case 2: + *R = Min; + *G = Min + C; + *B = Min + X; + break; + case 3: + *R = Min; + *G = Min + X; + *B = Min + C; + break; + case 4: + *R = Min + X; + *G = Min; + *B = Min + C; + break; + case 5: + *R = Min + C; + *G = Min; + *B = Min + X; + break; + default: + *R = *G = *B = 0; + } +} + + +/** + * @brief Convert an sRGB color to Hue-Saturation-Intensity (HSI) + * + * @param H, S, I pointers to hold the result + * @param R, G, B the input sRGB values scaled in [0,1] + * + * This routine transforms from sRGB to the cylindrical HSI color space. The + * sRGB values are assumed to be between 0 and 1. The output values are + * H = polar hue angle (0 <= H < 360), + * S = 1 - min(R',G',B')/I (0 <= S <= 1), + * I = (R'+G'+B')/3 (0 <= I <= 1). + * The inverse color transformation is given by Hsi2Rgb. + * + * Wikipedia: http://en.wikipedia.org/wiki/HSL_and_HSV + */ +void Rgb2Hsi(double *H, double *S, double *I, double R, double G, double B) +{ + double alpha = 0.5*(2*R - G - B); + double beta = 0.866025403784439*(G - B); + + + *I = (R + G + B)/3; + + if(*I > 0) + { + *S = 1 - MIN3(R,G,B) / *I; + *H = atan2(beta, alpha)*(180/M_PI); + + if(*H < 0) + *H += 360; + } + else + *H = *S = 0; +} + + +/** + * @brief Convert a Hue-Saturation-Intesity (HSI) color to sRGB + * + * @param R, G, B pointers to hold the result + * @param H, S, I the input HSI values + * + * The input values are assumed to be scaled as + * 0 <= H < 360, + * 0 <= S <= 1, + * 0 <= I <= 1. + * The output sRGB values are scaled between 0 and 1. This is the inverse + * transformation of Rgb2Hsi. + * + * Wikipedia: http://en.wikipedia.org/wiki/HSL_and_HSV + */ +void Hsi2Rgb(double *R, double *G, double *B, double H, double S, double I) +{ + H -= 360*floor(H/360); + + if(H < 120) + { + *B = I*(1 - S); + *R = I*(1 + S*cos(H*(M_PI/180))/cos((60 - H)*(M_PI/180))); + *G = 3*I - *R - *B; + } + else if(H < 240) + { + H -= 120; + *R = I*(1 - S); + *G = I*(1 + S*cos(H*(M_PI/180))/cos((60 - H)*(M_PI/180))); + *B = 3*I - *R - *G; + } + else + { + H -= 240; + *G = I*(1 - S); + *B = I*(1 + S*cos(H*(M_PI/180))/cos((60 - H)*(M_PI/180))); + *R = 3*I - *G - *B; + } +} + + +/* + * == CIE color transformations == + * + * The following routines implement transformations between sRGB and + * the CIE color spaces XYZ, L*a*b, L*u*v*, and L*C*H*. These + * transforms assume a 2 degree observer angle and a D65 illuminant. + */ + + +/** + * @brief Transform sRGB to CIE XYZ with the D65 white point + * + * @param X, Y, Z pointers to hold the result + * @param R, G, B the input sRGB values + * + * Poynton, "Frequently Asked Questions About Color," page 10 + * Wikipedia: http://en.wikipedia.org/wiki/SRGB + * Wikipedia: http://en.wikipedia.org/wiki/CIE_1931_color_space + */ +void Rgb2Xyz(double *X, double *Y, double *Z, double R, double G, double B) +{ + R = INVGAMMACORRECTION(R); + G = INVGAMMACORRECTION(G); + B = INVGAMMACORRECTION(B); + *X = (double)(0.4123955889674142161*R + 0.3575834307637148171*G + 0.1804926473817015735*B); + *Y = (double)(0.2125862307855955516*R + 0.7151703037034108499*G + 0.07220049864333622685*B); + *Z = (double)(0.01929721549174694484*R + 0.1191838645808485318*G + 0.9504971251315797660*B); +} + + +/** + * @brief Transform CIE XYZ to sRGB with the D65 white point + * + * @param R, G, B pointers to hold the result + * @param X, Y, Z the input XYZ values + * + * Official sRGB specification (IEC 61966-2-1:1999) + * Poynton, "Frequently Asked Questions About Color," page 10 + * Wikipedia: http://en.wikipedia.org/wiki/SRGB + * Wikipedia: http://en.wikipedia.org/wiki/CIE_1931_color_space + */ +void Xyz2Rgb(double *R, double *G, double *B, double X, double Y, double Z) +{ + double R1, B1, G1, Min; + + + R1 = (double)( 3.2406*X - 1.5372*Y - 0.4986*Z); + G1 = (double)(-0.9689*X + 1.8758*Y + 0.0415*Z); + B1 = (double)( 0.0557*X - 0.2040*Y + 1.0570*Z); + + Min = MIN3(R1, G1, B1); + + /* Force nonnegative values so that gamma correction is well-defined. */ + if(Min < 0) + { + R1 -= Min; + G1 -= Min; + B1 -= Min; + } + + /* Transform from RGB to R'G'B' */ + *R = GAMMACORRECTION(R1); + *G = GAMMACORRECTION(G1); + *B = GAMMACORRECTION(B1); +} + + +/** + * Convert CIE XYZ to CIE L*a*b* (CIELAB) with the D65 white point + * + * @param L, a, b pointers to hold the result + * @param X, Y, Z the input XYZ values + * + * Wikipedia: http://en.wikipedia.org/wiki/Lab_color_space + */ +void Xyz2Lab(double *L, double *a, double *b, double X, double Y, double Z) +{ + X /= WHITEPOINT_X; + Y /= WHITEPOINT_Y; + Z /= WHITEPOINT_Z; + X = LABF(X); + Y = LABF(Y); + Z = LABF(Z); + *L = 116*Y - 16; + *a = 500*(X - Y); + *b = 200*(Y - Z); +} + + +/** + * Convert CIE L*a*b* (CIELAB) to CIE XYZ with the D65 white point + * + * @param X, Y, Z pointers to hold the result + * @param L, a, b the input L*a*b* values + * + * Wikipedia: http://en.wikipedia.org/wiki/Lab_color_space + */ +void Lab2Xyz(double *X, double *Y, double *Z, double L, double a, double b) +{ + L = (L + 16)/116; + a = L + a/500; + b = L - b/200; + *X = WHITEPOINT_X*LABINVF(a); + *Y = WHITEPOINT_Y*LABINVF(L); + *Z = WHITEPOINT_Z*LABINVF(b); +} + + +/** + * Convert CIE XYZ to CIE L*u*v* (CIELUV) with the D65 white point + * + * @param L, u, v pointers to hold the result + * @param X, Y, Z the input XYZ values + * + * Wikipedia: http://en.wikipedia.org/wiki/CIELUV_color_space + */ +void Xyz2Luv(double *L, double *u, double *v, double X, double Y, double Z) +{ + double u1, v1, Denom; + + + if((Denom = X + 15*Y + 3*Z) > 0) + { + u1 = (4*X) / Denom; + v1 = (9*Y) / Denom; + } + else + u1 = v1 = 0; + + Y /= WHITEPOINT_Y; + Y = LABF(Y); + *L = 116*Y - 16; + *u = 13*(*L)*(u1 - WHITEPOINT_U); + *v = 13*(*L)*(v1 - WHITEPOINT_V); +} + + +/** + * Convert CIE L*u*v* (CIELUV) to CIE XYZ with the D65 white point + * + * @param X, Y, Z pointers to hold the result + * @param L, u, v the input L*u*v* values + * + * Wikipedia: http://en.wikipedia.org/wiki/CIELUV_color_space + */ +void Luv2Xyz(double *X, double *Y, double *Z, double L, double u, double v) +{ + *Y = (L + 16)/116; + *Y = WHITEPOINT_Y*LABINVF(*Y); + + if(L != 0) + { + u /= L; + v /= L; + } + + u = u/13 + WHITEPOINT_U; + v = v/13 + WHITEPOINT_V; + *X = (*Y) * ((9*u)/(4*v)); + *Z = (*Y) * ((3 - 0.75*u)/v - 5); +} + + +/** + * Convert CIE XYZ to CIE L*C*H* with the D65 white point + * + * @param L, C, H pointers to hold the result + * @param X, Y, Z the input XYZ values + * + * CIE L*C*H* is related to CIE L*a*b* by + * a* = C* cos(H* pi/180), + * b* = C* sin(H* pi/180). + */ +void Xyz2Lch(double *L, double *C, double *H, double X, double Y, double Z) +{ + double a, b; + + + Xyz2Lab(L, &a, &b, X, Y, Z); + *C = sqrt(a*a + b*b); + *H = atan2(b, a)*180.0/M_PI; + + if(*H < 0) + *H += 360; +} + +/** + * Convert CIE L*C*H* to CIE XYZ with the D65 white point + * + * @param X, Y, Z pointers to hold the result + * @param L, C, H the input L*C*H* values + */ +void Lch2Xyz(double *X, double *Y, double *Z, double L, double C, double H) +{ + double a = C * cos(H*(M_PI/180.0)); + double b = C * sin(H*(M_PI/180.0)); + + + Lab2Xyz(X, Y, Z, L, a, b); +} + + +/** @brief XYZ to CAT02 LMS */ +void Xyz2Cat02lms(double *L, double *M, double *S, double X, double Y, double Z) +{ + *L = (double)( 0.7328*X + 0.4296*Y - 0.1624*Z); + *M = (double)(-0.7036*X + 1.6975*Y + 0.0061*Z); + *S = (double)( 0.0030*X + 0.0136*Y + 0.9834*Z); +} + + +/** @brief CAT02 LMS to XYZ */ +void Cat02lms2Xyz(double *X, double *Y, double *Z, double L, double M, double S) +{ + *X = (double)( 1.096123820835514*L - 0.278869000218287*M + 0.182745179382773*S); + *Y = (double)( 0.454369041975359*L + 0.473533154307412*M + 0.072097803717229*S); + *Z = (double)(-0.009627608738429*L - 0.005698031216113*M + 1.015325639954543*S); +} + + +/* + * == Glue functions for multi-stage transforms == + */ + +void Rgb2Lab(double *L, double *a, double *b, double R, double G, double B) +{ + double X, Y, Z; + Rgb2Xyz(&X, &Y, &Z, R, G, B); + Xyz2Lab(L, a, b, X, Y, Z); +} + + +void Lab2Rgb(double *R, double *G, double *B, double L, double a, double b) +{ + double X, Y, Z; + Lab2Xyz(&X, &Y, &Z, L, a, b); + Xyz2Rgb(R, G, B, X, Y, Z); +} + + +void Rgb2Luv(double *L, double *u, double *v, double R, double G, double B) +{ + double X, Y, Z; + Rgb2Xyz(&X, &Y, &Z, R, G, B); + Xyz2Luv(L, u, v, X, Y, Z); +} + + +void Luv2Rgb(double *R, double *G, double *B, double L, double u, double v) +{ + double X, Y, Z; + Luv2Xyz(&X, &Y, &Z, L, u, v); + Xyz2Rgb(R, G, B, X, Y, Z); +} + +void Rgb2Lch(double *L, double *C, double *H, double R, double G, double B) +{ + double X, Y, Z; + Rgb2Xyz(&X, &Y, &Z, R, G, B); + Xyz2Lch(L, C, H, X, Y, Z); +} + + +void Lch2Rgb(double *R, double *G, double *B, double L, double C, double H) +{ + double X, Y, Z; + Lch2Xyz(&X, &Y, &Z, L, C, H); + Xyz2Rgb(R, G, B, X, Y, Z); +} + + +void Rgb2Cat02lms(double *L, double *M, double *S, double R, double G, double B) +{ + double X, Y, Z; + Rgb2Xyz(&X, &Y, &Z, R, G, B); + Xyz2Cat02lms(L, M, S, X, Y, Z); +} + + +void Cat02lms2Rgb(double *R, double *G, double *B, double L, double M, double S) +{ + double X, Y, Z; + Cat02lms2Xyz(&X, &Y, &Z, L, M, S); + Xyz2Rgb(R, G, B, X, Y, Z); +} diff --git a/libs/canvas/wave_view.cc b/libs/canvas/wave_view.cc index b5538a834a..553bcdf5d3 100644 --- a/libs/canvas/wave_view.cc +++ b/libs/canvas/wave_view.cc @@ -683,7 +683,7 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak color_to_hsv (_fill_color, h, s, v); /* change v towards white */ v *= 1.0 - gradient_depth(); - Color center = hsv_to_color (h, s, v, a); + Color center = hsva_to_color (h, s, v, a); color_to_rgba (center, r, g, b, a); gradient->add_color_stop_rgba (stops[0], r, g, b, a); diff --git a/libs/canvas/wscript b/libs/canvas/wscript index 684871e54f..468c5ea28e 100644 --- a/libs/canvas/wscript +++ b/libs/canvas/wscript @@ -33,6 +33,7 @@ canvas_sources = [ 'canvas.cc', 'circle.cc', 'colors.cc', + 'colorspace.cc', 'container.cc', 'curve.cc', 'debug.cc', |