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ghostwriter/src/ColorHelper.cpp at master · jackcoolpython/ghostwriter · GitHub
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ColorHelper.cpp
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/*
**********************************************************************
*
* Copyright (C) 2014, 2015 wereturtle
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
**********************************************************************
*/
#
include
<
QColor
>
#
include
<
QString
>
#
include
"
ColorHelper.h
"
QColor
ColorHelper::applyAlpha
(
const
QColor& foreground,
const
QColor& background)
{
QColor
blendedColor
(
0
,
0
,
0
);
blendedColor.
setRed
(
applyAlphaToChannel
(
foreground.
red
(),
background.
red
(),
foreground.
alphaF
()
)
);
blendedColor.
setGreen
(
applyAlphaToChannel
(
foreground.
green
(),
background.
green
(),
foreground.
alphaF
()
)
);
blendedColor.
setBlue
(
applyAlphaToChannel
(
foreground.
blue
(),
background.
blue
(),
foreground.
alphaF
()
)
);
return
blendedColor;
}
QColor ColorHelper::applyAlpha
(
const
QColor& foreground,
const
QColor& background,
int
alpha
)
{
if
((alpha <
0
) || alpha >
255
)
{
qCritical
(
"
ColorHelper::applyAlpha: alpha value must be
"
"
between 0 and 255. Value provided = %d
"
,
alpha);
}
QColor
blendedColor
(
0
,
0
,
0
);
qreal normalizedAlpha = alpha /
255.0
;
blendedColor.
setRed
(
applyAlphaToChannel
(
foreground.
red
(),
background.
red
(),
normalizedAlpha
)
);
blendedColor.
setGreen
(
applyAlphaToChannel
(
foreground.
green
(),
background.
green
(),
normalizedAlpha
)
);
blendedColor.
setBlue
(
applyAlphaToChannel
(
foreground.
blue
(),
background.
blue
(),
normalizedAlpha
)
);
return
blendedColor;
}
QString
ColorHelper::toRgbString
(
const
QColor& color)
{
return
QString
(
"
rgb(%1, %2, %3)
"
)
.
arg
(color.
red
())
.
arg
(color.
green
())
.
arg
(color.
blue
());
}
QString
ColorHelper::toRgbaString
(
const
QColor& color)
{
return
QString
(
"
rgba(%1, %2, %3, %4)
"
)
.
arg
(color.
red
())
.
arg
(color.
green
())
.
arg
(color.
blue
())
.
arg
(color.
alpha
());
}
//
Algorithm taken from *Grokking the GIMP* by Carey Bunks,
//
section 5.3.
//
//
Grokking the GIMP
//
by Carey Bunks
//
Copyright (c) 2000 by New Riders Publishing, www.newriders.com
//
ISBN 0-7357-0924-6.
//
double
ColorHelper::getLuminance
(
const
QColor& color)
{
QColor c = color;
//
Ensure color is non-zero.
if
(c ==
QColor
(Qt::black))
{
c.
setRgb
(
1
,
1
,
1
);
}
return
(
0.30
* c.
redF
()) + (
0.59
* c.
greenF
()) + (
0.11
* c.
blueF
());
}
QColor ColorHelper::lightenToMatchContrastRatio
(
const
QColor& foreground,
const
QColor& background,
double
contrastRatio
)
{
double
fgBrightness =
getLuminance
(foreground);
double
bgBrightness =
getLuminance
(background);
//
If the background color is brighter than the foreground color...
if
(bgBrightness > fgBrightness)
{
double
actualContrastRatio = bgBrightness / fgBrightness;
double
colorFactor = contrastRatio / actualContrastRatio;
QColor result = foreground;
//
Ensure color is non-zero.
if
(result ==
QColor
(Qt::black))
{
result.
setRgb
(
1
,
1
,
1
);
}
qreal r = result.
redF
() / colorFactor;
qreal g = result.
greenF
() / colorFactor;
qreal b = result.
blueF
() / colorFactor;
if
(r >
1.0
)
{
r =
1.0
;
}
if
(g >
1.0
)
{
g =
1.0
;
}
if
(b >
1.0
)
{
b =
1.0
;
}
result.
setRgbF
(r, g, b);
return
result;
}
else
{
//
This algorithm cannot change the foreground color when it is
//
lighter than the background color, so return the original
//
foreground color.
//
return
foreground;
}
}
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