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 "SkFlattenableBuffers.h"
26#include "SkTileImageFilter.h"
27
28#include "platform/graphics/GraphicsContext.h"
29#include "platform/graphics/Pattern.h"
30#include "platform/graphics/UnacceleratedImageBufferSurface.h"
31#include "platform/graphics/filters/SkiaImageFilterBuilder.h"
32#include "platform/text/TextStream.h"
33#include "platform/transforms/AffineTransform.h"
34#include "third_party/skia/include/core/SkDevice.h"
35
36namespace WebCore {
37
38FETile::FETile(Filter* filter)
39    : FilterEffect(filter)
40{
41}
42
43PassRefPtr<FETile> FETile::create(Filter* filter)
44{
45    return adoptRef(new FETile(filter));
46}
47
48FloatRect FETile::mapPaintRect(const FloatRect& rect, bool forward)
49{
50    return forward ? maxEffectRect() : inputEffect(0)->maxEffectRect();
51}
52
53void FETile::applySoftware()
54{
55    FilterEffect* in = inputEffect(0);
56
57    ImageBuffer* resultImage = createImageBufferResult();
58    if (!resultImage)
59        return;
60
61    setIsAlphaImage(in->isAlphaImage());
62
63    // Source input needs more attention. It has the size of the filterRegion but gives the
64    // size of the cutted sourceImage back. This is part of the specification and optimization.
65    FloatRect tileRect = in->maxEffectRect();
66    FloatPoint inMaxEffectLocation = tileRect.location();
67    FloatPoint maxEffectLocation = maxEffectRect().location();
68    if (in->filterEffectType() == FilterEffectTypeSourceInput) {
69        Filter* filter = this->filter();
70        tileRect = filter->absoluteFilterRegion();
71    }
72
73    OwnPtr<ImageBufferSurface> surface;
74    IntSize intTileSize = roundedIntSize(tileRect.size());
75    surface = adoptPtr(new UnacceleratedImageBufferSurface(intTileSize));
76    OwnPtr<ImageBuffer> tileImage = ImageBuffer::create(surface.release());
77    if (!tileImage)
78        return;
79
80    GraphicsContext* tileImageContext = tileImage->context();
81    tileImageContext->scale(intTileSize.width() / tileRect.width(), intTileSize.height() / tileRect.height());
82    tileImageContext->translate(-inMaxEffectLocation.x(), -inMaxEffectLocation.y());
83
84    if (ImageBuffer* tileImageBuffer = in->asImageBuffer())
85        tileImageContext->drawImageBuffer(tileImageBuffer, IntRect(in->absolutePaintRect().location(), tileImageBuffer->size()));
86
87    RefPtr<Pattern> pattern = Pattern::create(tileImage->copyImage(CopyBackingStore), true, true);
88
89    AffineTransform patternTransform;
90    patternTransform.translate(inMaxEffectLocation.x() - maxEffectLocation.x(), inMaxEffectLocation.y() - maxEffectLocation.y());
91    pattern->setPatternSpaceTransform(patternTransform);
92    GraphicsContext* filterContext = resultImage->context();
93    filterContext->setFillPattern(pattern);
94    filterContext->fillRect(FloatRect(FloatPoint(), absolutePaintRect().size()));
95}
96
97static FloatRect getRect(FilterEffect* effect)
98{
99    FloatRect result = effect->filter()->filterRegion();
100    FloatRect boundaries = effect->effectBoundaries();
101    if (effect->hasX())
102        result.setX(boundaries.x());
103    if (effect->hasY())
104        result.setY(boundaries.y());
105    if (effect->hasWidth())
106        result.setWidth(boundaries.width());
107    if (effect->hasHeight())
108        result.setHeight(boundaries.height());
109    return result;
110}
111
112PassRefPtr<SkImageFilter> FETile::createImageFilter(SkiaImageFilterBuilder* builder)
113{
114    RefPtr<SkImageFilter> input(builder->build(inputEffect(0), operatingColorSpace()));
115    FloatRect srcRect = inputEffect(0) ? getRect(inputEffect(0)) : filter()->filterRegion();
116    FloatRect dstRect = getRect(this);
117    return adoptRef(SkTileImageFilter::Create(srcRect, dstRect, input.get()));
118}
119
120TextStream& FETile::externalRepresentation(TextStream& ts, int indent) const
121{
122    writeIndent(ts, indent);
123    ts << "[feTile";
124    FilterEffect::externalRepresentation(ts);
125    ts << "]\n";
126    inputEffect(0)->externalRepresentation(ts, indent + 1);
127
128    return ts;
129}
130
131} // namespace WebCore
132