1 files changed, 98 insertions, 0 deletions
diff --git a/Source/WebCore/html/canvas/CanvasRenderingContext.cpp b/Source/WebCore/html/canvas/CanvasRenderingContext.cpp
new file mode 100644
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+++ b/Source/WebCore/html/canvas/CanvasRenderingContext.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "CanvasRenderingContext.h"
+
+#include "CachedImage.h"
+#include "CanvasPattern.h"
+#include "HTMLCanvasElement.h"
+#include "HTMLImageElement.h"
+#include "HTMLVideoElement.h"
+#include "KURL.h"
+#include "SecurityOrigin.h"
+
+namespace WebCore {
+
+CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
+    : m_canvas(canvas)
+{
+}
+
+void CanvasRenderingContext::ref()
+{
+    m_canvas->ref();
+}
+
+void CanvasRenderingContext::deref()
+{
+    m_canvas->deref(); 
+}
+
+void CanvasRenderingContext::checkOrigin(const CanvasPattern* pattern)
+{
+    if (canvas()->originClean() && pattern && !pattern->originClean())
+        canvas()->setOriginTainted();
+}
+
+void CanvasRenderingContext::checkOrigin(const HTMLCanvasElement* sourceCanvas)
+{
+    if (canvas()->originClean() && sourceCanvas && !sourceCanvas->originClean())
+        canvas()->setOriginTainted();
+}
+
+void CanvasRenderingContext::checkOrigin(const HTMLImageElement* image)
+{
+    if (!image || !canvas()->originClean())
+        return;
+
+    CachedImage* cachedImage = image->cachedImage();
+    checkOrigin(cachedImage->response().url());
+
+    if (canvas()->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())
+        canvas()->setOriginTainted();
+}
+
+void CanvasRenderingContext::checkOrigin(const HTMLVideoElement* video)
+{
+#if ENABLE(VIDEO)
+    checkOrigin(KURL(KURL(), video->currentSrc()));
+    if (canvas()->originClean() && video && !video->hasSingleSecurityOrigin())
+        canvas()->setOriginTainted();
+#endif
+}
+
+void CanvasRenderingContext::checkOrigin(const KURL& url)
+{
+    if (!canvas()->originClean() || m_cleanOrigins.contains(url.string()))
+        return;
+
+    if (canvas()->securityOrigin().taintsCanvas(url))
+        canvas()->setOriginTainted();
+    else
+        m_cleanOrigins.add(url.string());
+}
+
+} // namespace WebCore