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/*
Copyright (C) 2007 Eric Seidel <eric@webkit.org>
This file is part of the WebKit project
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 "config.h"
#if ENABLE(SVG)
#include "ColorDistance.h"
#include "Color.h"
#include <wtf/MathExtras.h>
namespace WebCore {
ColorDistance::ColorDistance()
: m_redDiff(0)
, m_greenDiff(0)
, m_blueDiff(0)
{
}
ColorDistance::ColorDistance(const Color& fromColor, const Color& toColor)
: m_redDiff(toColor.red() - fromColor.red())
, m_greenDiff(toColor.green() - fromColor.green())
, m_blueDiff(toColor.blue() - fromColor.blue())
{
}
ColorDistance::ColorDistance(int redDiff, int greenDiff, int blueDiff)
: m_redDiff(redDiff)
, m_greenDiff(greenDiff)
, m_blueDiff(blueDiff)
{
}
static inline int clampColorValue(int v)
{
if (v > 255)
v = 255;
else if (v < 0)
v = 0;
return v;
}
ColorDistance ColorDistance::scaledDistance(float scaleFactor) const
{
return ColorDistance(static_cast<int>(scaleFactor * m_redDiff),
static_cast<int>(scaleFactor * m_greenDiff),
static_cast<int>(scaleFactor * m_blueDiff));
}
Color ColorDistance::addColorsAndClamp(const Color& first, const Color& second)
{
return Color(clampColorValue(first.red() + second.red()),
clampColorValue(first.green() + second.green()),
clampColorValue(first.blue() + second.blue()));
}
Color ColorDistance::addToColorAndClamp(const Color& color) const
{
return Color(clampColorValue(color.red() + m_redDiff),
clampColorValue(color.green() + m_greenDiff),
clampColorValue(color.blue() + m_blueDiff));
}
bool ColorDistance::isZero() const
{
return (m_redDiff == 0 && m_blueDiff == 0 && m_greenDiff == 0);
}
float ColorDistance::distance() const
{
// This is just a simple distance calculation, not respecting color spaces
return sqrtf(m_redDiff * m_redDiff + m_blueDiff * m_blueDiff + m_greenDiff * m_greenDiff);
}
}
#endif
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