1/*
2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#include "config.h"
21
22#if ENABLE(FILTERS)
23#include "SourceAlpha.h"
24
25#include "Color.h"
26#include "Filter.h"
27#include "GraphicsContext.h"
28#include "TextStream.h"
29#include <wtf/StdLibExtras.h>
30#include <wtf/text/WTFString.h>
31
32namespace WebCore {
33
34PassRefPtr<SourceAlpha> SourceAlpha::create(Filter* filter)
35{
36    return adoptRef(new SourceAlpha(filter));
37}
38
39const AtomicString& SourceAlpha::effectName()
40{
41    DEPRECATED_DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha", AtomicString::ConstructFromLiteral));
42    return s_effectName;
43}
44
45void SourceAlpha::determineAbsolutePaintRect()
46{
47    Filter& filter = this->filter();
48    FloatRect paintRect = filter.sourceImageRect();
49    paintRect.scale(filter.filterResolution().width(), filter.filterResolution().height());
50    setAbsolutePaintRect(enclosingIntRect(paintRect));
51}
52
53void SourceAlpha::platformApplySoftware()
54{
55    ImageBuffer* resultImage = createImageBufferResult();
56    Filter& filter = this->filter();
57    if (!resultImage || !filter.sourceImage())
58        return;
59
60    setIsAlphaImage(true);
61
62    FloatRect imageRect(FloatPoint(), absolutePaintRect().size());
63    GraphicsContext* filterContext = resultImage->context();
64    filterContext->fillRect(imageRect, Color::black, ColorSpaceDeviceRGB);
65    filterContext->drawImageBuffer(filter.sourceImage(), ColorSpaceDeviceRGB, IntPoint(), CompositeDestinationIn);
66}
67
68void SourceAlpha::dump()
69{
70}
71
72TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const
73{
74    writeIndent(ts, indent);
75    ts << "[SourceAlpha]\n";
76    return ts;
77}
78
79} // namespace WebCore
80
81#endif // ENABLE(FILTERS)
82