Use SkImage as a backing store for copying 2d Contexts to ImageBitmaps.

Source/core/platform/graphics/ReadOnlyBitmapImage.cpp

Index: Source/core/platform/graphics/ReadOnlyBitmapImage.cpp
diff --git a/Source/core/platform/graphics/ReadOnlyBitmapImage.cpp b/Source/core/platform/graphics/ReadOnlyBitmapImage.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a57f293dace3668cb6010d5127e3e8fd354e4b91
--- /dev/null
+++ b/Source/core/platform/graphics/ReadOnlyBitmapImage.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2013 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 "core/platform/graphics/ReadOnlyBitmapImage.h"
+
+#include "core/platform/graphics/FloatRect.h"
+#include "core/platform/graphics/GraphicsContext.h"
+#include "third_party/skia/include/core/SkImage.h"
+
+namespace WebCore {
+
+ReadOnlyBitmapImage::ReadOnlyBitmapImage(SkImage* image)
+    : Image()
+    , m_image(image)
+    , m_size(image->width(), image->height())
+{
+}
+
+void ReadOnlyBitmapImage::draw(GraphicsContext* ctx, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, BlendMode blendMode)
+{
+    draw(ctx, dstRect, srcRect, compositeOp, blendMode, DoNotRespectImageOrientation);
+}
+
+void ReadOnlyBitmapImage::draw(GraphicsContext* ctx, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, BlendMode blendMode, RespectImageOrientationEnum shouldRespectImageOrientation)
+{
+    SkRect skSrcRect = srcRect;
+    m_image->draw(ctx->canvas(), &skSrcRect, dstRect, 0);
+}
+
+unsigned ReadOnlyBitmapImage::decodedSize() const
+{
+    return 0;
+}
+
+bool ReadOnlyBitmapImage::currentFrameKnownToBeOpaque()
+{
+    return false;
+}
+
+void ReadOnlyBitmapImage::destroyDecodedData()
+{
+    return;
+}
+
+} // namespace WebCore