diff -r 000000000000 -r 4f2f89ce4247 WebCore/bindings/js/JSHTMLCanvasElementCustom.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/js/JSHTMLCanvasElementCustom.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2007 Apple Inc. All rights reserved.
+ * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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 "JSHTMLCanvasElement.h"
+
+#include "CanvasContextAttributes.h"
+#include "HTMLCanvasElement.h"
+#include "JSCanvasRenderingContext2D.h"
+#if ENABLE(3D_CANVAS)
+#include "JSWebGLRenderingContext.h"
+#include "WebGLContextAttributes.h"
+#endif
+#include <wtf/GetPtr.h>
+
+using namespace JSC;
+
+namespace WebCore {
+
+void JSHTMLCanvasElement::markChildren(MarkStack& markStack)
+{
+    Base::markChildren(markStack);
+
+    HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
+    JSGlobalData& globalData = *Heap::heap(this)->globalData();
+
+    markDOMObjectWrapper(markStack, globalData, canvas->renderingContext());
+}
+
+JSValue JSHTMLCanvasElement::getContext(ExecState* exec)
+{
+    HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
+    const UString& contextId = exec->argument(0).toString(exec);
+    RefPtr<CanvasContextAttributes> attrs;
+#if ENABLE(3D_CANVAS)
+    if (contextId == "experimental-webgl" || contextId == "webkit-3d") {
+        attrs = WebGLContextAttributes::create();
+        WebGLContextAttributes* webGLAttrs = static_cast<WebGLContextAttributes*>(attrs.get());
+        if (exec->argumentCount() > 1 && exec->argument(1).isObject()) {
+            JSObject* jsAttrs = exec->argument(1).getObject();
+            Identifier alpha(exec, "alpha");
+            if (jsAttrs->hasProperty(exec, alpha))
+                webGLAttrs->setAlpha(jsAttrs->get(exec, alpha).toBoolean(exec));
+            Identifier depth(exec, "depth");
+            if (jsAttrs->hasProperty(exec, depth))
+                webGLAttrs->setDepth(jsAttrs->get(exec, depth).toBoolean(exec));
+            Identifier stencil(exec, "stencil");
+            if (jsAttrs->hasProperty(exec, stencil))
+                webGLAttrs->setStencil(jsAttrs->get(exec, stencil).toBoolean(exec));
+            Identifier antialias(exec, "antialias");
+            if (jsAttrs->hasProperty(exec, antialias))
+                webGLAttrs->setAntialias(jsAttrs->get(exec, antialias).toBoolean(exec));
+            Identifier premultipliedAlpha(exec, "premultipliedAlpha");
+            if (jsAttrs->hasProperty(exec, premultipliedAlpha))
+                webGLAttrs->setPremultipliedAlpha(jsAttrs->get(exec, premultipliedAlpha).toBoolean(exec));
+        }
+    }
+#endif
+    CanvasRenderingContext* context = canvas->getContext(ustringToString(contextId), attrs.get());
+    if (!context)
+        return jsNull();
+    return toJS(exec, globalObject(), WTF::getPtr(context));
+}
+
+JSValue JSHTMLCanvasElement::toDataURL(ExecState* exec)
+{
+    const String& type = valueToStringWithUndefinedOrNullCheck(exec, exec->argument(0));
+    HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
+    ExceptionCode ec = 0;
+    
+    JSC::JSValue result;
+    double quality;
+    double* qualityPtr = 0;
+    if (exec->argumentCount() > 1) {
+        JSValue v = exec->argument(1);
+        if (v.isNumber()) {
+            quality = v.toNumber(exec);
+            qualityPtr = &quality;
+        }
+    }
+    
+    result = jsString(exec, canvas->toDataURL(type, qualityPtr, ec));
+    setDOMException(exec, ec);
+    return result;
+}
+
+} // namespace WebCore