2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
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.
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.
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.
23 #include "SourceAlpha.h"
27 #include "GraphicsContext.h"
28 #include "PlatformString.h"
29 #include "RenderTreeAsText.h"
30 #include "TextStream.h"
32 #include <wtf/StdLibExtras.h>
36 PassRefPtr<SourceAlpha> SourceAlpha::create(Filter* filter)
38 return adoptRef(new SourceAlpha(filter));
41 const AtomicString& SourceAlpha::effectName()
43 DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha"));
47 void SourceAlpha::determineAbsolutePaintRect()
49 Filter* filter = this->filter();
50 FloatRect paintRect = filter->sourceImageRect();
51 paintRect.scale(filter->filterResolution().width(), filter->filterResolution().height());
52 setAbsolutePaintRect(enclosingIntRect(paintRect));
55 void SourceAlpha::platformApplySoftware()
57 ImageBuffer* resultImage = createImageBufferResult();
58 Filter* filter = this->filter();
59 if (!resultImage || !filter->sourceImage())
62 setIsAlphaImage(true);
64 FloatRect imageRect(FloatPoint(), absolutePaintRect().size());
65 GraphicsContext* filterContext = resultImage->context();
66 GraphicsContextStateSaver stateSaver(*filterContext);
67 filterContext->clipToImageBuffer(filter->sourceImage(), imageRect);
68 filterContext->fillRect(imageRect, Color::black, ColorSpaceDeviceRGB);
71 void SourceAlpha::dump()
75 TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const
77 writeIndent(ts, indent);
78 ts << "[SourceAlpha]\n";
82 } // namespace WebCore
84 #endif // ENABLE(FILTERS)