Adds SVGImageElement as a CanvasImageSource

third_party/WebKit/Source/core/html/canvas/CanvasImageElementSource.cpp

+// Copyright 2017 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 "core/html/canvas/CanvasImageElementSource.h"
+
+#include "core/layout/LayoutObject.h"
+#include "core/loader/ImageLoader.h"
+#include "core/svg/graphics/SVGImageForContainer.h"
+
+namespace blink {
+
+ImageResourceContent* CanvasImageElementSource::cachedImage() const {
+  return imageLoader().image();
+}
+
+const Element& CanvasImageElementSource::element() const {
+  return *imageLoader().element();
+}
+
+bool CanvasImageElementSource::isSVGSource() const {
+  return cachedImage() && cachedImage()->getImage()->isSVGImage();
+}
+
+PassRefPtr<Image> CanvasImageElementSource::getSourceImageForCanvas(
+    SourceImageStatus* status,
+    AccelerationHint,
+    SnapshotReason,
+    const FloatSize& defaultObjectSize) const {
+  if (!imageLoader().imageComplete() || !cachedImage()) {
+    *status = IncompleteSourceImageStatus;
+    return nullptr;
+  }
+
+  if (cachedImage()->errorOccurred()) {
+    *status = UndecodableSourceImageStatus;
+    return nullptr;
+  }
+
+  RefPtr<Image> sourceImage;
+  if (cachedImage()->getImage()->isSVGImage()) {
+    UseCounter::count(element().document(), UseCounter::SVGInCanvas2D);
+    SVGImage* svgImage = toSVGImage(cachedImage()->getImage());
+    IntSize imageSize =
+        roundedIntSize(svgImage->concreteObjectSize(defaultObjectSize));
+    sourceImage = SVGImageForContainer::create(
+        svgImage, imageSize, 1,
+        element().document().completeURL(element().imageSourceURL()));
+  } else {
+    sourceImage = cachedImage()->getImage();
+  }
+
+  *status = NormalSourceImageStatus;
+  return sourceImage->imageForDefaultFrame();
+}
+
+bool CanvasImageElementSource::wouldTaintOrigin(
+    SecurityOrigin* destinationSecurityOrigin) const {
+  return cachedImage() &&
+         !cachedImage()->isAccessAllowed(destinationSecurityOrigin);
+}
+
+FloatSize CanvasImageElementSource::elementSize(
+    const FloatSize& defaultObjectSize) const {
+  ImageResourceContent* image = cachedImage();
+  if (!image)
+    return FloatSize();
+
+  if (image->getImage() && image->getImage()->isSVGImage()) {
+    return toSVGImage(cachedImage()->getImage())
+        ->concreteObjectSize(defaultObjectSize);
+  }
+
+  return FloatSize(image->imageSize(
+      LayoutObject::shouldRespectImageOrientation(element().layoutObject()),
+      1.0f));
+}
+
+FloatSize CanvasImageElementSource::defaultDestinationSize(
+    const FloatSize& defaultObjectSize) const {
+  ImageResourceContent* image = cachedImage();
+  if (!image)
+    return FloatSize();
+
+  if (image->getImage() && image->getImage()->isSVGImage()) {
+    return toSVGImage(cachedImage()->getImage())
+        ->concreteObjectSize(defaultObjectSize);
+  }
+
+  LayoutSize size;
+  size = image->imageSize(
+      LayoutObject::shouldRespectImageOrientation(element().layoutObject()),
+      1.0f);
+  return FloatSize(size);
+}
+
+bool CanvasImageElementSource::isAccelerated() const {
+  return false;
+}
+
+const KURL& CanvasImageElementSource::sourceURL() const {
+  return cachedImage()->response().url();
+}
+
+int CanvasImageElementSource::sourceWidth() {
+  SourceImageStatus status;
+  RefPtr<Image> image =
+      getSourceImageForCanvas(&status, PreferNoAcceleration,
+                              SnapshotReasonUnknown, sourceDefaultObjectSize());
+  return image->width();
+}
+
+int CanvasImageElementSource::sourceHeight() {
+  SourceImageStatus status;
+  RefPtr<Image> image =
+      getSourceImageForCanvas(&status, PreferNoAcceleration,
+                              SnapshotReasonUnknown, sourceDefaultObjectSize());
+  return image->height();
+}
+
+bool CanvasImageElementSource::isOpaque() const {
+  Image* image = const_cast<Element&>(element()).imageContents();
+  return image && image->currentFrameKnownToBeOpaque();
+}
+
+}  // namespace blink