Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/StaticBitmapImage.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 //
 // The Chromium Authors can be found at
 // http://src.chromium.org/svn/trunk/src/AUTHORS
 //
 // 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
@@ skipping 10 matching lines @@
 // "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 "StaticBitmapImage.h"
+
+#include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/ImageObserver.h"
+#include "platform/graphics/skia/NativeImageSkia.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkShader.h"
+
+namespace WebCore {
+
+PassRefPtr<Image> StaticBitmapImage::create(PassRefPtr<SkImage> image)
+{
+    return adoptRef(new StaticBitmapImage(image));
+}
+
+StaticBitmapImage::StaticBitmapImage(PassRefPtr<SkImage> image) : m_image(image)
+{
+    m_image->setGpuToCpuCachingMechanism(SkImage::kWholeBitmap_CachingMechanism);

[Justin Novosad, 2014/07/29 14:56:52]

Mechanism -> Mode or Strategy?

[Rémi Piotaix, 2014/07/29 17:18:23]

Strategy :D
Done

+}
+
+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);
+}
+
+}