Dart bindings for WebKit

Source/WebCore/bindings/dart/custom/DartHTMLCanvasElementCustom.cpp

+// Copyright 2011, Google 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:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * 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.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "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 THE COPYRIGHT
+// OWNER 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 "DartHTMLCanvasElement.h"
+
+#include "CanvasRenderingContext.h"
+#include "CanvasRenderingContext2D.h"
+#include "DartDOMWrapper.h"
+#include "DartCanvasRenderingContext2D.h"
+#if ENABLE(WEBGL)
+#include "DartWebGLRenderingContext.h"
+#endif
+#include "HTMLCanvasElement.h"
+#if ENABLE(WEBGL)
+#include "DartUtilities.h"
+#include "WebGLRenderingContext.h"
+#endif
+
+
+namespace WebCore {
+
+namespace DartHTMLCanvasElementInternal {
+
+void toDataURLCallback(Dart_NativeArguments args)
+{
+    DartApiScope dartApiScope;
+    Dart_Handle exception;
+    {
+        HTMLCanvasElement* receiver = DartDOMWrapper::receiver<HTMLCanvasElement>(args);
+
+        const ParameterAdapter< String > type(Dart_GetNativeArgument(args, 1));
+        if (!type.conversionSuccessful()) {
+            exception = type.exception();
+            goto fail;
+        }
+
+        ExceptionCode ec = 0;
+        String result = receiver->toDataURL(type, 0, ec);
+        if (UNLIKELY(ec)) {
+            exception = DartDOMWrapper::exceptionCodeToDartException(ec);
+            goto fail;
+        }
+
+        DartDOMWrapper::returnValue(args, result, ConvertDefaultToNull);
+        return;
+    }
+
+fail:
+    Dart_ThrowException(exception);
+    ASSERT_NOT_REACHED();
+}
+
+void getContextCallback(Dart_NativeArguments args)
+{
+    DartApiScope dartApiScope;
+    Dart_Handle exception;
+    {
+        HTMLCanvasElement* receiver = DartDOMWrapper::receiver<HTMLCanvasElement>(args);
+
+        const ParameterAdapter< String > contextId(Dart_GetNativeArgument(args, 1));
+        if (!contextId.conversionSuccessful()) {
+            exception = contextId.exception();
+            goto fail;
+        }
+
+        // FIXME: implement support for CanvasContextAttributes.
+        CanvasRenderingContext* result = receiver->getContext(contextId, 0);
+        if (!result)
+            return;
+        if (result->is2d())
+            DartDOMWrapper::returnValue(args, static_cast<CanvasRenderingContext2D*>(result));
+#if ENABLE(WEBGL)
+        else if (result->is3d())
+            DartDOMWrapper::returnValue(args, static_cast<WebGLRenderingContext*>(result));
+#endif
+        else
+            ASSERT_NOT_REACHED();
+        return;
+    }
+
+fail:
+    Dart_ThrowException(exception);
+    ASSERT_NOT_REACHED();
+}
+
+} // namespace DartHTMLCanvasElementInternal
+
+} // namespace WebCore