1 /*
2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2013 Google Inc. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #ifndef FEColorMatrix_h
24 #define FEColorMatrix_h
25
26 #include "platform/graphics/filters/Filter.h"
27 #include "platform/graphics/filters/FilterEffect.h"
28 #include "wtf/Vector.h"
29
30 namespace WebCore {
31
32 enum ColorMatrixType {
33 FECOLORMATRIX_TYPE_UNKNOWN = 0,
34 FECOLORMATRIX_TYPE_MATRIX = 1,
35 FECOLORMATRIX_TYPE_SATURATE = 2,
36 FECOLORMATRIX_TYPE_HUEROTATE = 3,
37 FECOLORMATRIX_TYPE_LUMINANCETOALPHA = 4
38 };
39
40 class PLATFORM_EXPORT FEColorMatrix : public FilterEffect {
41 public:
42 static PassRefPtr<FEColorMatrix> create(Filter*, ColorMatrixType, const Vector<float>&);
43
44 ColorMatrixType type() const;
45 bool setType(ColorMatrixType);
46
47 const Vector<float>& values() const;
48 bool setValues(const Vector<float>&);
49
50 virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
51
52 virtual TextStream& externalRepresentation(TextStream&, int indention) const;
53
54 static inline void calculateSaturateComponents(float* components, float value);
55 static inline void calculateHueRotateComponents(float* components, float value);
56
57 private:
58 FEColorMatrix(Filter*, ColorMatrixType, const Vector<float>&);
59
60 virtual void applySoftware() OVERRIDE;
61 virtual bool applySkia() OVERRIDE;
62
63 ColorMatrixType m_type;
64 Vector<float> m_values;
65 };
66
calculateSaturateComponents(float * components,float value)67 inline void FEColorMatrix::calculateSaturateComponents(float* components, float value)
68 {
69 components[0] = (0.213 + 0.787 * value);
70 components[1] = (0.715 - 0.715 * value);
71 components[2] = (0.072 - 0.072 * value);
72 components[3] = (0.213 - 0.213 * value);
73 components[4] = (0.715 + 0.285 * value);
74 components[5] = (0.072 - 0.072 * value);
75 components[6] = (0.213 - 0.213 * value);
76 components[7] = (0.715 - 0.715 * value);
77 components[8] = (0.072 + 0.928 * value);
78 }
79
calculateHueRotateComponents(float * components,float value)80 inline void FEColorMatrix::calculateHueRotateComponents(float* components, float value)
81 {
82 float cosHue = cos(value * piFloat / 180);
83 float sinHue = sin(value * piFloat / 180);
84 components[0] = 0.213 + cosHue * 0.787 - sinHue * 0.213;
85 components[1] = 0.715 - cosHue * 0.715 - sinHue * 0.715;
86 components[2] = 0.072 - cosHue * 0.072 + sinHue * 0.928;
87 components[3] = 0.213 - cosHue * 0.213 + sinHue * 0.143;
88 components[4] = 0.715 + cosHue * 0.285 + sinHue * 0.140;
89 components[5] = 0.072 - cosHue * 0.072 - sinHue * 0.283;
90 components[6] = 0.213 - cosHue * 0.213 - sinHue * 0.787;
91 components[7] = 0.715 - cosHue * 0.715 + sinHue * 0.715;
92 components[8] = 0.072 + cosHue * 0.928 + sinHue * 0.072;
93 }
94
95
96 } // namespace WebCore
97
98 #endif // FEColorMatrix_h
99