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 FEComposite_h
24#define FEComposite_h
25
26#include "platform/graphics/filters/Filter.h"
27#include "platform/graphics/filters/FilterEffect.h"
28#include "wtf/text/WTFString.h"
29
30namespace blink {
31
32enum CompositeOperationType {
33    FECOMPOSITE_OPERATOR_UNKNOWN    = 0,
34    FECOMPOSITE_OPERATOR_OVER       = 1,
35    FECOMPOSITE_OPERATOR_IN         = 2,
36    FECOMPOSITE_OPERATOR_OUT        = 3,
37    FECOMPOSITE_OPERATOR_ATOP       = 4,
38    FECOMPOSITE_OPERATOR_XOR        = 5,
39    FECOMPOSITE_OPERATOR_ARITHMETIC = 6
40};
41
42class PLATFORM_EXPORT FEComposite : public FilterEffect {
43public:
44    static PassRefPtr<FEComposite> create(Filter*, const CompositeOperationType&, float, float, float, float);
45
46    CompositeOperationType operation() const;
47    bool setOperation(CompositeOperationType);
48
49    float k1() const;
50    bool setK1(float);
51
52    float k2() const;
53    bool setK2(float);
54
55    float k3() const;
56    bool setK3(float);
57
58    float k4() const;
59    bool setK4(float);
60
61    virtual void correctFilterResultIfNeeded() OVERRIDE;
62
63    virtual FloatRect determineAbsolutePaintRect(const FloatRect& requestedRect) OVERRIDE;
64
65    virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
66
67    virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
68    virtual PassRefPtr<SkImageFilter> createImageFilterWithoutValidation(SkiaImageFilterBuilder*) OVERRIDE;
69
70protected:
71    virtual bool mayProduceInvalidPreMultipliedPixels() OVERRIDE { return m_type == FECOMPOSITE_OPERATOR_ARITHMETIC; }
72
73private:
74    FEComposite(Filter*, const CompositeOperationType&, float, float, float, float);
75
76    virtual void applySoftware() OVERRIDE;
77    PassRefPtr<SkImageFilter> createImageFilterInternal(SkiaImageFilterBuilder*, bool requiresPMColorValidation);
78
79    inline void platformArithmeticSoftware(Uint8ClampedArray* source, Uint8ClampedArray* destination,
80        float k1, float k2, float k3, float k4);
81    template <int b1, int b4>
82    static inline void computeArithmeticPixelsNeon(unsigned char* source, unsigned  char* destination,
83        unsigned pixelArrayLength, float k1, float k2, float k3, float k4);
84    static inline void platformArithmeticNeon(unsigned char* source, unsigned  char* destination,
85        unsigned pixelArrayLength, float k1, float k2, float k3, float k4);
86
87    CompositeOperationType m_type;
88    float m_k1;
89    float m_k2;
90    float m_k3;
91    float m_k4;
92};
93
94} // namespace blink
95
96#endif // FEComposite_h
97