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
30namespace blink {
31
32enum 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
40class PLATFORM_EXPORT FEColorMatrix : public FilterEffect {
41public:
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 OVERRIDE;
53
54    static inline void calculateSaturateComponents(float* components, float value);
55    static inline void calculateHueRotateComponents(float* components, float value);
56
57private:
58    FEColorMatrix(Filter*, ColorMatrixType, const Vector<float>&);
59
60    virtual void applySoftware() OVERRIDE;
61
62    virtual bool affectsTransparentPixels() OVERRIDE;
63
64    ColorMatrixType m_type;
65    Vector<float> m_values;
66};
67
68} // namespace blink
69
70#endif // FEColorMatrix_h
71