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