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1 /*
2  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
3  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
4  * Copyright (C) 2013 Google Inc. All rights reserved.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public License
17  * along with this library; see the file COPYING.LIB.  If not, write to
18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19  * Boston, MA 02110-1301, USA.
20  */
21 
22 #include "config.h"
23 #include "platform/graphics/filters/FETile.h"
24 
25 #include "SkTileImageFilter.h"
26 
27 #include "platform/graphics/GraphicsContext.h"
28 #include "platform/graphics/Pattern.h"
29 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
30 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
31 #include "platform/text/TextStream.h"
32 #include "platform/transforms/AffineTransform.h"
33 #include "third_party/skia/include/core/SkDevice.h"
34 
35 namespace blink {
36 
FETile(Filter * filter)37 FETile::FETile(Filter* filter)
38     : FilterEffect(filter)
39 {
40 }
41 
create(Filter * filter)42 PassRefPtr<FETile> FETile::create(Filter* filter)
43 {
44     return adoptRef(new FETile(filter));
45 }
46 
mapPaintRect(const FloatRect & rect,bool forward)47 FloatRect FETile::mapPaintRect(const FloatRect& rect, bool forward)
48 {
49     return forward ? maxEffectRect() : inputEffect(0)->maxEffectRect();
50 }
51 
applySoftware()52 void FETile::applySoftware()
53 {
54     FilterEffect* in = inputEffect(0);
55 
56     ImageBuffer* resultImage = createImageBufferResult();
57     if (!resultImage)
58         return;
59 
60     setIsAlphaImage(in->isAlphaImage());
61 
62     // Source input needs more attention. It has the size of the filterRegion but gives the
63     // size of the cutted sourceImage back. This is part of the specification and optimization.
64     FloatRect tileRect = in->maxEffectRect();
65     FloatPoint inMaxEffectLocation = tileRect.location();
66     FloatPoint maxEffectLocation = maxEffectRect().location();
67     if (in->filterEffectType() == FilterEffectTypeSourceInput) {
68         Filter* filter = this->filter();
69         tileRect = filter->absoluteFilterRegion();
70     }
71 
72     OwnPtr<ImageBufferSurface> surface;
73     IntSize intTileSize = roundedIntSize(tileRect.size());
74     surface = adoptPtr(new UnacceleratedImageBufferSurface(intTileSize));
75     OwnPtr<ImageBuffer> tileImage = ImageBuffer::create(surface.release());
76     if (!tileImage)
77         return;
78 
79     GraphicsContext* tileImageContext = tileImage->context();
80     tileImageContext->scale(intTileSize.width() / tileRect.width(), intTileSize.height() / tileRect.height());
81     tileImageContext->translate(-inMaxEffectLocation.x(), -inMaxEffectLocation.y());
82 
83     if (ImageBuffer* tileImageBuffer = in->asImageBuffer())
84         tileImageContext->drawImageBuffer(tileImageBuffer, IntRect(in->absolutePaintRect().location(), tileImageBuffer->size()));
85 
86     RefPtr<Pattern> pattern = Pattern::createBitmapPattern(tileImage->copyImage(CopyBackingStore));
87 
88     AffineTransform patternTransform;
89     patternTransform.translate(inMaxEffectLocation.x() - maxEffectLocation.x(), inMaxEffectLocation.y() - maxEffectLocation.y());
90     pattern->setPatternSpaceTransform(patternTransform);
91     GraphicsContext* filterContext = resultImage->context();
92     filterContext->setFillPattern(pattern);
93     filterContext->fillRect(FloatRect(FloatPoint(), absolutePaintRect().size()));
94 }
95 
getRect(FilterEffect * effect)96 static FloatRect getRect(FilterEffect* effect)
97 {
98     FloatRect result = effect->filter()->filterRegion();
99     FloatRect boundaries = effect->effectBoundaries();
100     if (effect->hasX())
101         result.setX(boundaries.x());
102     if (effect->hasY())
103         result.setY(boundaries.y());
104     if (effect->hasWidth())
105         result.setWidth(boundaries.width());
106     if (effect->hasHeight())
107         result.setHeight(boundaries.height());
108     return result;
109 }
110 
createImageFilter(SkiaImageFilterBuilder * builder)111 PassRefPtr<SkImageFilter> FETile::createImageFilter(SkiaImageFilterBuilder* builder)
112 {
113     RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
114     FloatRect srcRect = inputEffect(0) ? getRect(inputEffect(0)) : filter()->filterRegion();
115     FloatRect dstRect = getRect(this);
116     return adoptRef(SkTileImageFilter::Create(srcRect, dstRect, input.get()));
117 }
118 
externalRepresentation(TextStream & ts,int indent) const119 TextStream& FETile::externalRepresentation(TextStream& ts, int indent) const
120 {
121     writeIndent(ts, indent);
122     ts << "[feTile";
123     FilterEffect::externalRepresentation(ts);
124     ts << "]\n";
125     inputEffect(0)->externalRepresentation(ts, indent + 1);
126 
127     return ts;
128 }
129 
130 } // namespace blink
131