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) 2013 Google Inc. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB.  If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23#include "config.h"
24#include "platform/graphics/filters/FEMerge.h"
25
26#include "SkMergeImageFilter.h"
27#include "platform/graphics/GraphicsContext.h"
28#include "platform/graphics/filters/SkiaImageFilterBuilder.h"
29#include "platform/text/TextStream.h"
30#include "wtf/OwnPtr.h"
31
32namespace blink {
33
34FEMerge::FEMerge(Filter* filter)
35    : FilterEffect(filter)
36{
37}
38
39PassRefPtr<FEMerge> FEMerge::create(Filter* filter)
40{
41    return adoptRef(new FEMerge(filter));
42}
43
44void FEMerge::applySoftware()
45{
46    unsigned size = numberOfEffectInputs();
47    ASSERT(size > 0);
48
49    ImageBuffer* resultImage = createImageBufferResult();
50    if (!resultImage)
51        return;
52
53    GraphicsContext* filterContext = resultImage->context();
54    for (unsigned i = 0; i < size; ++i) {
55        FilterEffect* in = inputEffect(i);
56        filterContext->drawImageBuffer(in->asImageBuffer(), drawingRegionOfInputImage(in->absolutePaintRect()));
57    }
58}
59
60PassRefPtr<SkImageFilter> FEMerge::createImageFilter(SkiaImageFilterBuilder* builder)
61{
62    unsigned size = numberOfEffectInputs();
63
64    OwnPtr<RefPtr<SkImageFilter>[]> inputRefs = adoptArrayPtr(new RefPtr<SkImageFilter>[size]);
65    OwnPtr<SkImageFilter*[]> inputs = adoptArrayPtr(new SkImageFilter*[size]);
66    for (unsigned i = 0; i < size; ++i) {
67        inputRefs[i] = builder->build(inputEffect(i), operatingColorSpace());
68        inputs[i] = inputRefs[i].get();
69    }
70    SkImageFilter::CropRect rect = getCropRect(builder->cropOffset());
71    return adoptRef(SkMergeImageFilter::Create(inputs.get(), size, 0, &rect));
72}
73
74TextStream& FEMerge::externalRepresentation(TextStream& ts, int indent) const
75{
76    writeIndent(ts, indent);
77    ts << "[feMerge";
78    FilterEffect::externalRepresentation(ts);
79    unsigned size = numberOfEffectInputs();
80    ASSERT(size > 0);
81    ts << " mergeNodes=\"" << size << "\"]\n";
82    for (unsigned i = 0; i < size; ++i)
83        inputEffect(i)->externalRepresentation(ts, indent + 1);
84    return ts;
85}
86
87} // namespace blink
88