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tde-style-qtcurve/common/colorutils.c

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9.1 KiB

/*
This file is taken from kcolorspaces.cpp and kcolorutils.cpp from kdelibs
The code has been modified to work with TQColor (TQt3 &TQt4) and GdkColor
*/
/* This file is part of the KDE project
* Copyright (C) 2007 Matthew Woehlke <mw_triad@users.sourceforge.net>
* Copyright (C) 2007 Olaf Schmidt <ojschmidt@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <math.h>
#ifdef __cplusplus
#if (0x039999 >= 0x040000)
#define FLOAT_COLOR(VAL, COL) (VAL).COL##F()
#define TO_COLOR(R, G, B) TQColor::fromRgbF(R, G, B)
#else
#define FLOAT_COLOR(VAL, COL) ((double)(((VAL).COL()*1.0)/255.0))
#define TO_COLOR(R, G, B) TQColor(limit(R*255.0), limit(G*255.0), limit(B*255.0))
#endif
#else
#define inline
#define FLOAT_COLOR(VAL, COL) ((double)(((VAL).COL*1.0)/65535.0))
static GdkColor qtcGdkColor(double r, double g, double b)
{
GdkColor col;
col.red=limit(r*65535);
col.green=limit(g*65535);
col.blue=limit(b*65535);
return col;
}
#define TO_COLOR(R, G, B) qtcGdkColor(R, G, B)
#endif
static inline double ColorUtils_normalize(double a)
{
return (a < 1.0 ? (a > 0.0 ? a : 0.0) : 1.0);
}
static inline double ColorUtils_wrap(double a)
{
static double d = 1.0;
double r = fmod(a, d);
return (r < 0.0 ? d + r : (r > 0.0 ? r : 0.0));
}
#define HCY_REC 709 // use 709 for now
#if HCY_REC == 601
static const double yc[3] = { 0.299, 0.587, 0.114 };
#elif HCY_REC == 709
static const double yc[3] = {0.2126, 0.7152, 0.0722};
#else // use TQt values
static const double yc[3] = { 0.34375, 0.5, 0.15625 };
#endif
static inline double ColorUtils_HCY_gamma(double n)
{
return pow(ColorUtils_normalize(n), 2.2);
}
static inline double ColorUtils_HCY_igamma(double n)
{
return pow(ColorUtils_normalize(n), 1.0/2.2);
}
static inline double ColorUtils_HCY_lumag(double r, double g, double b)
{
return r*yc[0] + g*yc[1] + b*yc[2];
}
typedef struct
{
double h, c, y;
} ColorUtils_HCY;
// static ColorUtils_HCY ColorUtils_HCY_fromValues(double h_, double c_, double y_/*, double a_*/)
// {
// h = h_;
// c = c_;
// y = y_;
// // a = a_;
// }
static ColorUtils_HCY ColorUtils_HCY_fromColor(const color *color)
{
ColorUtils_HCY hcy;
double r = ColorUtils_HCY_gamma(FLOAT_COLOR(*color, red));
double g = ColorUtils_HCY_gamma(FLOAT_COLOR(*color, green));
double b = ColorUtils_HCY_gamma(FLOAT_COLOR(*color, blue));
// a = color.alphaF();
// luma component
hcy.y = ColorUtils_HCY_lumag(r, g, b);
// hue component
double p = MAX(MAX(r, g), b);
double n = MIN(MIN(r, g), b);
double d = 6.0 * (p - n);
if (n == p)
hcy.h = 0.0;
else if (r == p)
hcy.h = ((g - b) / d);
else if (g == p)
hcy.h = ((b - r) / d) + (1.0 / 3.0);
else
hcy.h = ((r - g) / d) + (2.0 / 3.0);
// chroma component
if (0.0 == hcy.y || 1.0 == hcy.y)
hcy.c = 0.0;
else
hcy.c = MAX( (hcy.y - n) / hcy.y, (p - hcy.y) / (1 - hcy.y) );
return hcy;
}
static color ColorUtils_HCY_toColor(ColorUtils_HCY *hcy)
{
// start with sane component values
double _h = ColorUtils_wrap(hcy->h);
double _c = ColorUtils_normalize(hcy->c);
double _y = ColorUtils_normalize(hcy->y);
// calculate some needed variables
double _hs = _h * 6.0, th, tm;
if (_hs < 1.0) {
th = _hs;
tm = yc[0] + yc[1] * th;
}
else if (_hs < 2.0) {
th = 2.0 - _hs;
tm = yc[1] + yc[0] * th;
}
else if (_hs < 3.0) {
th = _hs - 2.0;
tm = yc[1] + yc[2] * th;
}
else if (_hs < 4.0) {
th = 4.0 - _hs;
tm = yc[2] + yc[1] * th;
}
else if (_hs < 5.0) {
th = _hs - 4.0;
tm = yc[2] + yc[0] * th;
}
else {
th = 6.0 - _hs;
tm = yc[0] + yc[2] * th;
}
// calculate RGB channels in sorted order
double tn, to, tp;
if (tm >= _y) {
tp = _y + _y * _c * (1.0 - tm) / tm;
to = _y + _y * _c * (th - tm) / tm;
tn = _y - (_y * _c);
}
else {
tp = _y + (1.0 - _y) * _c;
to = _y + (1.0 - _y) * _c * (th - tm) / (1.0 - tm);
tn = _y - (1.0 - _y) * _c * tm / (1.0 - tm);
}
// return RGB channels in appropriate order
if (_hs < 1.0)
return TO_COLOR(ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tn));
else if (_hs < 2.0)
return TO_COLOR(ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(tn));
else if (_hs < 3.0)
return TO_COLOR(ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(to));
else if (_hs < 4.0)
return TO_COLOR(ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tp));
else if (_hs < 5.0)
return TO_COLOR(ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(tp));
else
return TO_COLOR(ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(to));
}
// #ifndef __cplusplus
static inline double ColorUtils_HCY_luma(const color *color)
{
return ColorUtils_HCY_lumag(ColorUtils_HCY_gamma(FLOAT_COLOR(*color, red)),
ColorUtils_HCY_gamma(FLOAT_COLOR(*color, green)),
ColorUtils_HCY_gamma(FLOAT_COLOR(*color, blue)));
}
static inline double ColorUtils_mixQreal(double a, double b, double bias)
{
return a + (b - a) * bias;
}
static inline double ColorUtils_luma(const color *color)
{
return ColorUtils_HCY_luma(color);
}
static double ColorUtils_contrastRatio(const color *c1, const color *c2)
{
double y1 = ColorUtils_luma(c1), y2 = ColorUtils_luma(c2);
if (y1 > y2)
return (y1 + 0.05) / (y2 + 0.05);
else
return (y2 + 0.05) / (y1 + 0.05);
}
static color ColorUtils_lighten(const color *color, double ky, double kc)
{
ColorUtils_HCY c=ColorUtils_HCY_fromColor(color);
c.y = 1.0 - ColorUtils_normalize((1.0 - c.y) * (1.0 - ky));
c.c = 1.0 - ColorUtils_normalize((1.0 - c.c) * kc);
return ColorUtils_HCY_toColor(&c);
}
static color ColorUtils_darken(const color *color, double ky, double kc)
{
ColorUtils_HCY c=ColorUtils_HCY_fromColor(color);
c.y = ColorUtils_normalize(c.y * (1.0 - ky));
c.c = ColorUtils_normalize(c.c * kc);
return ColorUtils_HCY_toColor(&c);
}
static color ColorUtils_shade(const color *color, double ky, double kc)
{
ColorUtils_HCY c=ColorUtils_HCY_fromColor(color);
c.y = ColorUtils_normalize(c.y + ky);
c.c = ColorUtils_normalize(c.c + kc);
return ColorUtils_HCY_toColor(&c);
}
static color ColorUtils_mix(const color *c1, const color *c2, double bias);
static color ColorUtils_tintHelper(const color *base, const color *col, double amount)
{
color mixed=ColorUtils_mix(base, col, pow(amount, 0.3));
ColorUtils_HCY c=ColorUtils_HCY_fromColor(&mixed);
c.y = ColorUtils_mixQreal(ColorUtils_luma(base), c.y, amount);
return ColorUtils_HCY_toColor(&c);
}
static color ColorUtils_tint(const color *base, const color *col, double amount)
{
if (amount <= 0.0) return *base;
if (amount >= 1.0) return *col;
if (isnan(amount)) return *base;
double ri = ColorUtils_contrastRatio(base, col);
double rg = 1.0 + ((ri + 1.0) * amount * amount * amount);
double u = 1.0, l = 0.0;
color result;
int i;
for (i = 12 ; i ; --i) {
double a = 0.5 * (l+u);
result = ColorUtils_tintHelper(base, col, a);
double ra = ColorUtils_contrastRatio(base, &result);
if (ra > rg)
u = a;
else
l = a;
}
return result;
}
static color ColorUtils_mix(const color *c1, const color *c2, double bias)
{
if (bias <= 0.0) return *c1;
if (bias >= 1.0) return *c2;
if (isnan(bias)) return *c1;
{
double r = ColorUtils_mixQreal(FLOAT_COLOR(*c1, red), FLOAT_COLOR(*c2, red), bias);
double g = ColorUtils_mixQreal(FLOAT_COLOR(*c1, green), FLOAT_COLOR(*c2, green), bias);
double b = ColorUtils_mixQreal(FLOAT_COLOR(*c1, blue), FLOAT_COLOR(*c2, blue), bias);
/*double a = ColorUtils_mixQreal(FLOAT_COLOR(*c1, alpha), FLOAT_COLOR(*c2, alpha), bias);*/
return TO_COLOR(r, g, b);
}
}
// #endif
/* Added!!! */
// static color ColorUtils_shade_qtc(const color *color, double k)
// {
// ColorUtils_HCY c=ColorUtils_HCY_fromColor(color);
// c.y = ColorUtils_normalize(c.y * (k>1.0 ? (k*1.1) : (k<1.0 ? (k*0.9) : k)));
// return ColorUtils_HCY_toColor(&c);
// }