Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/StaticBitmapImage.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "StaticBitmapImage.h"
+
+#include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/ImageObserver.h"
+#include "platform/graphics/skia/NativeImageSkia.h"
+#include "third_party/skia/include/core/SkImage.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkShader.h"
+
+namespace blink {
+
+PassRefPtr<Image> StaticBitmapImage::create(PassRefPtr<SkImage> image)
+{
+    return adoptRef(new StaticBitmapImage(image));
+}
+
+StaticBitmapImage::StaticBitmapImage(PassRefPtr<SkImage> image) : m_image(image)
+{
+    m_image->setGpuToCpuCachingStrategy(SkImage::kWholeBitmap_CachingStrategy);
+}
+
+StaticBitmapImage::~StaticBitmapImage() { }
+
+IntSize StaticBitmapImage::size() const
+{
+    return IntSize(m_image->width(), m_image->height());
+}
+
+void StaticBitmapImage::draw(GraphicsContext* ctx, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, blink::WebBlendMode blendMode)
+{
+    FloatRect normDstRect = adjustForNegativeSize(dstRect);
+    FloatRect normSrcRect = adjustForNegativeSize(srcRect);
+
+    normSrcRect.intersect(FloatRect(0, 0, m_image->width(), m_image->height()));
+
+    if (normSrcRect.isEmpty() || normDstRect.isEmpty())
+        return; // Nothing to draw.
+
+    ASSERT(normSrcRect.width() <= m_image->width() && normSrcRect.height() <= m_image->height());
+
+    SkPaint paint;
+    ctx->preparePaintForDrawRectToRect(&paint, srcRect, dstRect, compositeOp, blendMode);
+
+    SkRect srcSkRect = WebCoreFloatRectToSKRect(normSrcRect);
+    SkRect dstSkRect = WebCoreFloatRectToSKRect(normDstRect);
+
+    SkCanvas* canvas = ctx->canvas();
+
+    m_image->draw(canvas, &srcSkRect, dstSkRect, &paint);
+
+    if (ImageObserver* observer = imageObserver())
+        observer->didDraw(this);
+}
+
+}