1 files changed, 84 insertions, 0 deletions
diff --git a/Source/WebCore/platform/graphics/filters/SourceAlpha.cpp b/Source/WebCore/platform/graphics/filters/SourceAlpha.cpp
new file mode 100644
index 000000000..aeebde6f8
--- /dev/null
+++ b/Source/WebCore/platform/graphics/filters/SourceAlpha.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+
+#if ENABLE(FILTERS)
+#include "SourceAlpha.h"
+
+#include "Color.h"
+#include "Filter.h"
+#include "GraphicsContext.h"
+#include "PlatformString.h"
+#include "RenderTreeAsText.h"
+#include "TextStream.h"
+
+#include <wtf/StdLibExtras.h>
+
+namespace WebCore {
+
+PassRefPtr<SourceAlpha> SourceAlpha::create(Filter* filter)
+{
+    return adoptRef(new SourceAlpha(filter));
+}
+
+const AtomicString& SourceAlpha::effectName()
+{
+    DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha"));
+    return s_effectName;
+}
+
+void SourceAlpha::determineAbsolutePaintRect()
+{
+    Filter* filter = this->filter();
+    FloatRect paintRect = filter->sourceImageRect();
+    paintRect.scale(filter->filterResolution().width(), filter->filterResolution().height());
+    setAbsolutePaintRect(enclosingIntRect(paintRect));
+}
+
+void SourceAlpha::platformApplySoftware()
+{
+    ImageBuffer* resultImage = createImageBufferResult();
+    Filter* filter = this->filter();
+    if (!resultImage || !filter->sourceImage())
+        return;
+
+    setIsAlphaImage(true);
+
+    FloatRect imageRect(FloatPoint(), absolutePaintRect().size());
+    GraphicsContext* filterContext = resultImage->context();
+    GraphicsContextStateSaver stateSaver(*filterContext);
+    filterContext->clipToImageBuffer(filter->sourceImage(), imageRect);
+    filterContext->fillRect(imageRect, Color::black, ColorSpaceDeviceRGB);
+}
+
+void SourceAlpha::dump()
+{
+}
+
+TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const
+{
+    writeIndent(ts, indent);
+    ts << "[SourceAlpha]\n";
+    return ts;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(FILTERS)