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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) 2009 Dirk Schulze <krit@webkit.org>
6  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
7  * Copyright (C) 2013 Google Inc. All rights reserved.
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Library General Public
11  * License as published by the Free Software Foundation; either
12  * version 2 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * Library General Public License for more details.
18  *
19  * You should have received a copy of the GNU Library General Public License
20  * along with this library; see the file COPYING.LIB.  If not, write to
21  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22  * Boston, MA 02110-1301, USA.
23  */
24 
25 #include "config.h"
26 #include "platform/graphics/filters/FEOffset.h"
27 
28 #include "SkOffsetImageFilter.h"
29 #include "platform/graphics/GraphicsContext.h"
30 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
31 #include "platform/text/TextStream.h"
32 #include "third_party/skia/include/core/SkDevice.h"
33 
34 namespace blink {
35 
FEOffset(Filter * filter,float dx,float dy)36 FEOffset::FEOffset(Filter* filter, float dx, float dy)
37     : FilterEffect(filter)
38     , m_dx(dx)
39     , m_dy(dy)
40 {
41 }
42 
create(Filter * filter,float dx,float dy)43 PassRefPtr<FEOffset> FEOffset::create(Filter* filter, float dx, float dy)
44 {
45     return adoptRef(new FEOffset(filter, dx, dy));
46 }
47 
dx() const48 float FEOffset::dx() const
49 {
50     return m_dx;
51 }
52 
setDx(float dx)53 void FEOffset::setDx(float dx)
54 {
55     m_dx = dx;
56 }
57 
dy() const58 float FEOffset::dy() const
59 {
60     return m_dy;
61 }
62 
setDy(float dy)63 void FEOffset::setDy(float dy)
64 {
65     m_dy = dy;
66 }
67 
mapRect(const FloatRect & rect,bool forward)68 FloatRect FEOffset::mapRect(const FloatRect& rect, bool forward)
69 {
70     FloatRect result = rect;
71     if (forward)
72         result.move(filter()->applyHorizontalScale(m_dx), filter()->applyVerticalScale(m_dy));
73     else
74         result.move(-filter()->applyHorizontalScale(m_dx), -filter()->applyVerticalScale(m_dy));
75     return result;
76 }
77 
applySoftware()78 void FEOffset::applySoftware()
79 {
80     FilterEffect* in = inputEffect(0);
81 
82     ImageBuffer* resultImage = createImageBufferResult();
83     if (!resultImage)
84         return;
85 
86     setIsAlphaImage(in->isAlphaImage());
87 
88     FloatRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect());
89     Filter* filter = this->filter();
90     drawingRegion.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy));
91     resultImage->context()->drawImageBuffer(in->asImageBuffer(), drawingRegion);
92 }
93 
createImageFilter(SkiaImageFilterBuilder * builder)94 PassRefPtr<SkImageFilter> FEOffset::createImageFilter(SkiaImageFilterBuilder* builder)
95 {
96     RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
97     Filter* filter = this->filter();
98     SkImageFilter::CropRect cropRect = getCropRect(builder->cropOffset());
99     return adoptRef(SkOffsetImageFilter::Create(SkFloatToScalar(filter->applyHorizontalScale(m_dx)), SkFloatToScalar(filter->applyVerticalScale(m_dy)), input.get(), &cropRect));
100 }
101 
externalRepresentation(TextStream & ts,int indent) const102 TextStream& FEOffset::externalRepresentation(TextStream& ts, int indent) const
103 {
104     writeIndent(ts, indent);
105     ts << "[feOffset";
106     FilterEffect::externalRepresentation(ts);
107     ts << " dx=\"" << dx() << "\" dy=\"" << dy() << "\"]\n";
108     inputEffect(0)->externalRepresentation(ts, indent + 1);
109     return ts;
110 }
111 
112 } // namespace blink
113