external/webkit r30707

1 files changed, 94 insertions, 0 deletions

diff --git a/WebCore/svg/ColorDistance.cpp b/WebCore/svg/ColorDistance.cpp
new file mode 100644
index 0000000..9e632ae
--- /dev/null
+++ b/WebCore/svg/ColorDistance.cpp
@@ -0,0 +1,94 @@
+/*
+ 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