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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/FEMorphology.h"
27 
28 #include "SkMorphologyImageFilter.h"
29 #include "platform/graphics/GraphicsContext.h"
30 #include "platform/graphics/Image.h"
31 #include "platform/graphics/filters/ParallelJobs.h"
32 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
33 #include "platform/text/TextStream.h"
34 #include "wtf/Uint8ClampedArray.h"
35 
36 namespace blink {
37 
FEMorphology(Filter * filter,MorphologyOperatorType type,float radiusX,float radiusY)38 FEMorphology::FEMorphology(Filter* filter, MorphologyOperatorType type, float radiusX, float radiusY)
39     : FilterEffect(filter)
40     , m_type(type)
41     , m_radiusX(radiusX)
42     , m_radiusY(radiusY)
43 {
44 }
45 
create(Filter * filter,MorphologyOperatorType type,float radiusX,float radiusY)46 PassRefPtr<FEMorphology> FEMorphology::create(Filter* filter, MorphologyOperatorType type, float radiusX, float radiusY)
47 {
48     return adoptRef(new FEMorphology(filter, type, radiusX, radiusY));
49 }
50 
morphologyOperator() const51 MorphologyOperatorType FEMorphology::morphologyOperator() const
52 {
53     return m_type;
54 }
55 
setMorphologyOperator(MorphologyOperatorType type)56 bool FEMorphology::setMorphologyOperator(MorphologyOperatorType type)
57 {
58     if (m_type == type)
59         return false;
60     m_type = type;
61     return true;
62 }
63 
radiusX() const64 float FEMorphology::radiusX() const
65 {
66     return m_radiusX;
67 }
68 
setRadiusX(float radiusX)69 bool FEMorphology::setRadiusX(float radiusX)
70 {
71     if (m_radiusX == radiusX)
72         return false;
73     m_radiusX = radiusX;
74     return true;
75 }
76 
radiusY() const77 float FEMorphology::radiusY() const
78 {
79     return m_radiusY;
80 }
81 
mapRect(const FloatRect & rect,bool)82 FloatRect FEMorphology::mapRect(const FloatRect& rect, bool)
83 {
84     FloatRect result = rect;
85     result.inflateX(filter()->applyHorizontalScale(m_radiusX));
86     result.inflateY(filter()->applyVerticalScale(m_radiusY));
87     return result;
88 }
89 
setRadiusY(float radiusY)90 bool FEMorphology::setRadiusY(float radiusY)
91 {
92     if (m_radiusY == radiusY)
93         return false;
94     m_radiusY = radiusY;
95     return true;
96 }
97 
applySoftware()98 void FEMorphology::applySoftware()
99 {
100     ImageBuffer* resultImage = createImageBufferResult();
101     if (!resultImage)
102         return;
103 
104     FilterEffect* in = inputEffect(0);
105 
106     IntRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect());
107 
108     setIsAlphaImage(in->isAlphaImage());
109 
110     float radiusX = filter()->applyHorizontalScale(m_radiusX);
111     float radiusY = filter()->applyVerticalScale(m_radiusY);
112 
113     RefPtr<Image> image = in->asImageBuffer()->copyImage(DontCopyBackingStore);
114 
115     SkPaint paint;
116     GraphicsContext* dstContext = resultImage->context();
117     if (m_type == FEMORPHOLOGY_OPERATOR_DILATE)
118         paint.setImageFilter(SkDilateImageFilter::Create(radiusX, radiusY))->unref();
119     else if (m_type == FEMORPHOLOGY_OPERATOR_ERODE)
120         paint.setImageFilter(SkErodeImageFilter::Create(radiusX, radiusY))->unref();
121 
122     SkRect bounds = SkRect::MakeWH(absolutePaintRect().width(), absolutePaintRect().height());
123     dstContext->saveLayer(&bounds, &paint);
124     dstContext->drawImage(image.get(), drawingRegion.location(), CompositeCopy);
125     dstContext->restoreLayer();
126 }
127 
createImageFilter(SkiaImageFilterBuilder * builder)128 PassRefPtr<SkImageFilter> FEMorphology::createImageFilter(SkiaImageFilterBuilder* builder)
129 {
130     RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
131     SkScalar radiusX = SkFloatToScalar(filter()->applyHorizontalScale(m_radiusX));
132     SkScalar radiusY = SkFloatToScalar(filter()->applyVerticalScale(m_radiusY));
133     SkImageFilter::CropRect rect = getCropRect(builder->cropOffset());
134     if (m_type == FEMORPHOLOGY_OPERATOR_DILATE)
135         return adoptRef(SkDilateImageFilter::Create(radiusX, radiusY, input.get(), &rect));
136     return adoptRef(SkErodeImageFilter::Create(radiusX, radiusY, input.get(), &rect));
137 }
138 
operator <<(TextStream & ts,const MorphologyOperatorType & type)139 static TextStream& operator<<(TextStream& ts, const MorphologyOperatorType& type)
140 {
141     switch (type) {
142     case FEMORPHOLOGY_OPERATOR_UNKNOWN:
143         ts << "UNKNOWN";
144         break;
145     case FEMORPHOLOGY_OPERATOR_ERODE:
146         ts << "ERODE";
147         break;
148     case FEMORPHOLOGY_OPERATOR_DILATE:
149         ts << "DILATE";
150         break;
151     }
152     return ts;
153 }
154 
externalRepresentation(TextStream & ts,int indent) const155 TextStream& FEMorphology::externalRepresentation(TextStream& ts, int indent) const
156 {
157     writeIndent(ts, indent);
158     ts << "[feMorphology";
159     FilterEffect::externalRepresentation(ts);
160     ts << " operator=\"" << morphologyOperator() << "\" "
161         << "radius=\"" << radiusX() << ", " << radiusY() << "\"]\n";
162     inputEffect(0)->externalRepresentation(ts, indent + 1);
163     return ts;
164 }
165 
166 } // namespace blink
167