| /* |
| * Copyright (C) 2007 Eric Seidel <eric@webkit.org> |
| * |
| * 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" |
| #include "core/svg/ColorDistance.h" |
| |
| #include "platform/graphics/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::clampColor(int red, int green, int blue, int alpha) |
| { |
| return Color(clampColorValue(red), clampColorValue(green), clampColorValue(blue), clampColorValue(alpha)); |
| } |
| |
| Color ColorDistance::addColors(const Color& first, const Color& second) |
| { |
| return Color(first.red() + second.red(), first.green() + second.green(), first.blue() + second.blue()); |
| } |
| |
| Color ColorDistance::addToColor(const Color& color) const |
| { |
| return Color(color.red() + m_redDiff, color.green() + m_greenDiff, color.blue() + m_blueDiff); |
| } |
| |
| bool ColorDistance::isZero() const |
| { |
| return !m_redDiff && !m_blueDiff && !m_greenDiff; |
| } |
| |
| 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); |
| } |
| |
| } |