1 /*
2 Copyright (C) 2007 Eric Seidel <eric@webkit.org>
3
4 This file is part of the WebKit project
5
6 This library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
10
11 This library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public License
17 along with this library; see the file COPYING.LIB. If not, write to
18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA.
20 */
21
22 #include "config.h"
23 #if ENABLE(SVG)
24 #include "ColorDistance.h"
25 #include "Color.h"
26 #include <wtf/MathExtras.h>
27
28 namespace WebCore {
29
ColorDistance()30 ColorDistance::ColorDistance()
31 : m_redDiff(0)
32 , m_greenDiff(0)
33 , m_blueDiff(0)
34 {
35 }
36
ColorDistance(const Color & fromColor,const Color & toColor)37 ColorDistance::ColorDistance(const Color& fromColor, const Color& toColor)
38 : m_redDiff(toColor.red() - fromColor.red())
39 , m_greenDiff(toColor.green() - fromColor.green())
40 , m_blueDiff(toColor.blue() - fromColor.blue())
41 {
42 }
43
ColorDistance(int redDiff,int greenDiff,int blueDiff)44 ColorDistance::ColorDistance(int redDiff, int greenDiff, int blueDiff)
45 : m_redDiff(redDiff)
46 , m_greenDiff(greenDiff)
47 , m_blueDiff(blueDiff)
48 {
49 }
50
clampColorValue(int v)51 static inline int clampColorValue(int v)
52 {
53 if (v > 255)
54 v = 255;
55 else if (v < 0)
56 v = 0;
57 return v;
58 }
59
scaledDistance(float scaleFactor) const60 ColorDistance ColorDistance::scaledDistance(float scaleFactor) const
61 {
62 return ColorDistance(static_cast<int>(scaleFactor * m_redDiff),
63 static_cast<int>(scaleFactor * m_greenDiff),
64 static_cast<int>(scaleFactor * m_blueDiff));
65 }
66
addColorsAndClamp(const Color & first,const Color & second)67 Color ColorDistance::addColorsAndClamp(const Color& first, const Color& second)
68 {
69 return Color(clampColorValue(first.red() + second.red()),
70 clampColorValue(first.green() + second.green()),
71 clampColorValue(first.blue() + second.blue()));
72 }
73
addToColorAndClamp(const Color & color) const74 Color ColorDistance::addToColorAndClamp(const Color& color) const
75 {
76 return Color(clampColorValue(color.red() + m_redDiff),
77 clampColorValue(color.green() + m_greenDiff),
78 clampColorValue(color.blue() + m_blueDiff));
79 }
80
isZero() const81 bool ColorDistance::isZero() const
82 {
83 return (m_redDiff == 0 && m_blueDiff == 0 && m_greenDiff == 0);
84 }
85
distance() const86 float ColorDistance::distance() const
87 {
88 // This is just a simple distance calculation, not respecting color spaces
89 return sqrtf(m_redDiff * m_redDiff + m_blueDiff * m_blueDiff + m_greenDiff * m_greenDiff);
90 }
91
92 }
93
94 #endif
95