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/*
* Bespin library for Qt style, KWin decoration and everythng else
* Copyright 2007-2012 by Thomas Lübking <thomas.luebking@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 version 2
*
* This program 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 program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "colors.h"
#define CLAMP(x,l,u) (x) < (l) ? (l) :\
(x) > (u) ? (u) :\
(x)
#include <QWidget>
#include <QApplication>
using namespace Bespin;
const QColor &
Colors::bg(const QPalette &pal, const QWidget *w)
{
QPalette::ColorRole role;
if (!w)
role = QPalette::Window;
else if (w->parentWidget())
role = w->parentWidget()->backgroundRole();
else
role = w->backgroundRole();
// if (pal.brush(role).style() > 1)
return pal.color(role);
// return QApplication::palette().color(role);
}
int
Colors::contrast(const QColor &a, const QColor &b)
{
int ar,ag,ab,br,bg,bb;
a.getRgb(&ar,&ag,&ab);
b.getRgb(&br,&bg,&bb);
int diff = 299*(ar-br) + 587*(ag-bg) + 114*(ab-bb);
diff = (diff < 0) ? -diff : 90*diff/100;
int perc = diff / 2550;
diff = qMax(ar,br) + qMax(ag,bg) + qMax(ab,bb)
- (qMin(ar,br) + qMin(ag,bg) + qMin(ab,bb));
perc += diff/765;
perc /= 2;
return perc;
}
QPalette::ColorRole
Colors::counterRole(QPalette::ColorRole role)
{
switch (role) {
case QPalette::ButtonText: //8
return QPalette::Button;
case QPalette::WindowText: //0
return QPalette::Window;
case QPalette::HighlightedText: //13
return QPalette::Highlight;
case QPalette::Window: //10
return QPalette::WindowText;
case QPalette::Base: //9
return QPalette::Text;
case QPalette::Text: //6
return QPalette::Base;
case QPalette::Highlight: //12
return QPalette::HighlightedText;
case QPalette::Button: //1
return QPalette::ButtonText;
default:
return QPalette::Window;
}
}
bool
Colors::counterRole(QPalette::ColorRole &from, QPalette::ColorRole &to, QPalette::ColorRole defFrom,
QPalette::ColorRole defTo)
{
switch (from) {
case QPalette::WindowText: //0
to = QPalette::Window; break;
case QPalette::Window: //10
to = QPalette::WindowText; break;
case QPalette::Base: //9
to = QPalette::Text; break;
case QPalette::Text: //6
to = QPalette::Base; break;
case QPalette::Button: //1
to = QPalette::ButtonText; break;
case QPalette::ButtonText: //8
to = QPalette::Button; break;
case QPalette::Highlight: //12
to = QPalette::HighlightedText; break;
case QPalette::HighlightedText: //13
to = QPalette::Highlight; break;
default:
from = defFrom;
to = defTo;
return false;
}
return true;
}
QColor
Colors::emphasize(const QColor &c, int value)
{
int h,s,v,a;
QColor ret;
c.getHsv(&h,&s,&v,&a);
if (v < 75+value) {
ret.setHsv(h,s,CLAMP(85+value,85,255),a);
return ret;
}
if (v > 200) {
if (s > 30) {
h -= 5; if (h < 0) h = 360 + h;
s = (s<<3)/9;
v += value;
ret.setHsv(h,CLAMP(s,30,255),CLAMP(v,0,255),a);
return ret;
}
if (v > 230) {
ret.setHsv(h,s,CLAMP(v-value,0,255),a);
return ret;
}
}
if (v > 128)
ret.setHsv(h,s,CLAMP(v+value,0,255),a);
else
ret.setHsv(h,s,CLAMP(v-value,0,255),a);
return ret;
}
bool
Colors::haveContrast(const QColor &a, const QColor &b)
{
int ar,ag,ab,br,bg,bb;
a.getRgb(&ar,&ag,&ab);
b.getRgb(&br,&bg,&bb);
int diff = (299*(ar-br) + 587*(ag-bg) + 114*(ab-bb));
if (qAbs(diff) < 91001)
return false;
diff = qMax(ar,br) + qMax(ag,bg) + qMax(ab,bb)
- (qMin(ar,br) + qMin(ag,bg) + qMin(ab,bb));
return (diff > 300);
}
QColor
Colors::light(const QColor &c, int value)
{
int h,s,v, a;
c.getHsv(&h,&s,&v,&a);
QColor ret;
if (v < 255-value)
{
ret.setHsv(h,s,CLAMP(v+value,0,255),a); //value could be negative
return ret;
}
// psychovisual uplightning, i.e. shift hue and lower saturation
if (s > 30)
{
h -= (value*5/20); if (h < 0) h = 400 + h;
s = CLAMP((s<<3)/9,30,255);
ret.setHsv(h,s,255,a);
return ret;
}
else // hue shifting has no sense, half saturation (btw, white won't get brighter :)
ret.setHsv(h,s>>1,255,a);
return ret;
}
QColor
Colors::mid(const QColor &c1, const QColor &c2, int w1, int w2)
{
int sum = (w1+w2);
if (!sum)
return Qt::black;
int r,g,b,a;
#if 0
QColor c1 = oc1;
b = value(c1);
if (b < 70)
{
c1.getHsv(&r,&g,&b,&a);
c1.setHsv(r,g,70,a);
}
#endif
r = (w1*c1.red() + w2*c2.red())/sum; r = CLAMP(r,0,255);
g = (w1*c1.green() + w2*c2.green())/sum; g = CLAMP(g,0,255);
b = (w1*c1.blue() + w2*c2.blue())/sum; b = CLAMP(b,0,255);
a = (w1*c1.alpha() + w2*c2.alpha())/sum; a = CLAMP(a,0,255);
return QColor(r,g,b,a);
}
int
Colors::value(const QColor &c)
{
int v = c.red();
if (c.green() > v) v = c.green();
if (c.blue() > v) v = c.blue();
return v;
}
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