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