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-/* This was part of the KDE project - see KGuiAddons
- * Copyright (C) 2007 Matthew Woehlke <mw_triad@users.sourceforge.net>
- * Copyright (C) 2007 Olaf Schmidt <ojschmidt@kde.org>
- * Copyright (C) 2007 Thomas Zander <zander@kde.org>
- * Copyright (C) 2007 Zack Rusin <zack@kde.org>
- * Copyright (C) 2015 Petr Mrazek <peterix@gmail.com>
- *
- * 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 "../include/rainbow.h"
-
-#include <QColor>
-#include <QImage>
-#include <QtNumeric> // qIsNaN
-
-#include <math.h>
-
-//BEGIN internal helper functions
-
-static inline qreal wrap(qreal a, qreal d = 1.0)
-{
- qreal r = fmod(a, d);
- return (r < 0.0 ? d + r : (r > 0.0 ? r : 0.0));
-}
-
-// normalize: like qBound(a, 0.0, 1.0) but without needing the args and with
-// "safer" behavior on NaN (isnan(a) -> return 0.0)
-static inline qreal normalize(qreal a)
-{
- return (a < 1.0 ? (a > 0.0 ? a : 0.0) : 1.0);
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-// HCY color space
-
-#define HCY_REC 709 // use 709 for now
-#if HCY_REC == 601
-static const qreal yc[3] = {0.299, 0.587, 0.114};
-#elif HCY_REC == 709
-static const qreal yc[3] = {0.2126, 0.7152, 0.0722};
-#else // use Qt values
-static const qreal yc[3] = {0.34375, 0.5, 0.15625};
-#endif
-
-class KHCY
-{
-public:
- explicit KHCY(const QColor &color)
- {
- qreal r = gamma(color.redF());
- qreal g = gamma(color.greenF());
- qreal b = gamma(color.blueF());
- a = color.alphaF();
-
- // luma component
- y = lumag(r, g, b);
-
- // hue component
- qreal p = qMax(qMax(r, g), b);
- qreal n = qMin(qMin(r, g), b);
- qreal d = 6.0 * (p - n);
- if (n == p)
- {
- h = 0.0;
- }
- else if (r == p)
- {
- h = ((g - b) / d);
- }
- else if (g == p)
- {
- h = ((b - r) / d) + (1.0 / 3.0);
- }
- else
- {
- h = ((r - g) / d) + (2.0 / 3.0);
- }
-
- // chroma component
- if (r == g && g == b)
- {
- c = 0.0;
- }
- else
- {
- c = qMax((y - n) / y, (p - y) / (1 - y));
- }
- }
- explicit KHCY(qreal h_, qreal c_, qreal y_, qreal a_ = 1.0)
- {
- h = h_;
- c = c_;
- y = y_;
- a = a_;
- }
-
- QColor qColor() const
- {
- // start with sane component values
- qreal _h = wrap(h);
- qreal _c = normalize(c);
- qreal _y = normalize(y);
-
- // calculate some needed variables
- qreal _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
- qreal 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 QColor::fromRgbF(igamma(tp), igamma(to), igamma(tn), a);
- }
- else if (_hs < 2.0)
- {
- return QColor::fromRgbF(igamma(to), igamma(tp), igamma(tn), a);
- }
- else if (_hs < 3.0)
- {
- return QColor::fromRgbF(igamma(tn), igamma(tp), igamma(to), a);
- }
- else if (_hs < 4.0)
- {
- return QColor::fromRgbF(igamma(tn), igamma(to), igamma(tp), a);
- }
- else if (_hs < 5.0)
- {
- return QColor::fromRgbF(igamma(to), igamma(tn), igamma(tp), a);
- }
- else
- {
- return QColor::fromRgbF(igamma(tp), igamma(tn), igamma(to), a);
- }
- }
-
- qreal h, c, y, a;
- static qreal luma(const QColor &color)
- {
- return lumag(gamma(color.redF()), gamma(color.greenF()), gamma(color.blueF()));
- }
-
-private:
- static qreal gamma(qreal n)
- {
- return pow(normalize(n), 2.2);
- }
- static qreal igamma(qreal n)
- {
- return pow(normalize(n), 1.0 / 2.2);
- }
- static qreal lumag(qreal r, qreal g, qreal b)
- {
- return r * yc[0] + g * yc[1] + b * yc[2];
- }
-};
-
-static inline qreal mixQreal(qreal a, qreal b, qreal bias)
-{
- return a + (b - a) * bias;
-}
-//END internal helper functions
-
-qreal Rainbow::luma(const QColor &color)
-{
- return KHCY::luma(color);
-}
-
-void Rainbow::getHcy(const QColor &color, qreal *h, qreal *c, qreal *y, qreal *a)
-{
- if (!c || !h || !y)
- {
- return;
- }
- KHCY khcy(color);
- *c = khcy.c;
- *h = khcy.h;
- *y = khcy.y;
- if (a)
- {
- *a = khcy.a;
- }
-}
-
-static qreal contrastRatioForLuma(qreal y1, qreal y2)
-{
- if (y1 > y2)
- {
- return (y1 + 0.05) / (y2 + 0.05);
- }
- else
- {
- return (y2 + 0.05) / (y1 + 0.05);
- }
-}
-
-qreal Rainbow::contrastRatio(const QColor &c1, const QColor &c2)
-{
- return contrastRatioForLuma(luma(c1), luma(c2));
-}
-
-QColor Rainbow::lighten(const QColor &color, qreal ky, qreal kc)
-{
- KHCY c(color);
- c.y = 1.0 - normalize((1.0 - c.y) * (1.0 - ky));
- c.c = 1.0 - normalize((1.0 - c.c) * kc);
- return c.qColor();
-}
-
-QColor Rainbow::darken(const QColor &color, qreal ky, qreal kc)
-{
- KHCY c(color);
- c.y = normalize(c.y * (1.0 - ky));
- c.c = normalize(c.c * kc);
- return c.qColor();
-}
-
-QColor Rainbow::shade(const QColor &color, qreal ky, qreal kc)
-{
- KHCY c(color);
- c.y = normalize(c.y + ky);
- c.c = normalize(c.c + kc);
- return c.qColor();
-}
-
-static QColor tintHelper(const QColor &base, qreal baseLuma, const QColor &color, qreal amount)
-{
- KHCY result(Rainbow::mix(base, color, pow(amount, 0.3)));
- result.y = mixQreal(baseLuma, result.y, amount);
-
- return result.qColor();
-}
-
-QColor Rainbow::tint(const QColor &base, const QColor &color, qreal amount)
-{
- if (amount <= 0.0)
- {
- return base;
- }
- if (amount >= 1.0)
- {
- return color;
- }
- if (qIsNaN(amount))
- {
- return base;
- }
-
- qreal baseLuma = luma(base); // cache value because luma call is expensive
- double ri = contrastRatioForLuma(baseLuma, luma(color));
- double rg = 1.0 + ((ri + 1.0) * amount * amount * amount);
- double u = 1.0, l = 0.0;
- QColor result;
- for (int i = 12; i; --i)
- {
- double a = 0.5 * (l + u);
- result = tintHelper(base, baseLuma, color, a);
- double ra = contrastRatioForLuma(baseLuma, luma(result));
- if (ra > rg)
- {
- u = a;
- }
- else
- {
- l = a;
- }
- }
- return result;
-}
-
-QColor Rainbow::mix(const QColor &c1, const QColor &c2, qreal bias)
-{
- if (bias <= 0.0)
- {
- return c1;
- }
- if (bias >= 1.0)
- {
- return c2;
- }
- if (qIsNaN(bias))
- {
- return c1;
- }
-
- qreal r = mixQreal(c1.redF(), c2.redF(), bias);
- qreal g = mixQreal(c1.greenF(), c2.greenF(), bias);
- qreal b = mixQreal(c1.blueF(), c2.blueF(), bias);
- qreal a = mixQreal(c1.alphaF(), c2.alphaF(), bias);
-
- return QColor::fromRgbF(r, g, b, a);
-}
-
-QColor Rainbow::overlayColors(const QColor &base, const QColor &paint,
- QPainter::CompositionMode comp)
-{
- // This isn't the fastest way, but should be "fast enough".
- // It's also the only safe way to use QPainter::CompositionMode
- QImage img(1, 1, QImage::Format_ARGB32_Premultiplied);
- QPainter p(&img);
- QColor start = base;
- start.setAlpha(255); // opaque
- p.fillRect(0, 0, 1, 1, start);
- p.setCompositionMode(comp);
- p.fillRect(0, 0, 1, 1, paint);
- p.end();
- return img.pixel(0, 0);
-}
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