Adds SVGImageElement as a CanvasImageSource

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

+/*
+ * Copyright (C) 2017 Google Inc. All rights reserved.

[fs, 2017/03/06 22:46:15]

Same comment as in the header.

[fserb, 2017/03/07 20:44:02]

done. sorry for that.

+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ *
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "core/html/canvas/CanvasHTMLSVGImage.h"
+
+#include "core/html/HTMLImageLoader.h"
+#include "core/layout/LayoutObject.h"
+#include "core/svg/graphics/SVGImageForContainer.h"
+
+namespace blink {
+
+bool CanvasHTMLSVGImage::isSVGSource() const {
+  return cachedImage() && cachedImage()->getImage()->isSVGImage();
+}
+
+PassRefPtr<Image> CanvasHTMLSVGImage::getSourceImageForCanvas(
+    SourceImageStatus* status,
+    AccelerationHint,
+    SnapshotReason,
+    const FloatSize& defaultObjectSize) const {
+  if (!imageLoaded() || !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 CanvasHTMLSVGImage::wouldTaintOrigin(
+    SecurityOrigin* destinationSecurityOrigin) const {
+  return cachedImage() &&
+         !cachedImage()->isAccessAllowed(destinationSecurityOrigin);
+}
+
+FloatSize CanvasHTMLSVGImage::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 CanvasHTMLSVGImage::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 CanvasHTMLSVGImage::isAccelerated() const {
+  return false;

[fs, 2017/03/06 22:46:15]

Isn't this what the base-class has?

[fserb, 2017/03/07 20:44:02]

pure virtual on base class, do you want me to change that?

[fs, 2017/03/07 22:01:24]

Sorry, maybe I quick-scanned too quickly and got it mixed up with the impl for
isOpaque. This is fine.

+}
+
+const KURL& CanvasHTMLSVGImage::sourceURL() const {
+  return cachedImage()->response().url();
+}
+
+int CanvasHTMLSVGImage::sourceWidth() {
+  SourceImageStatus status;
+  FloatSize defaultObjectSize;  // (width(), height()) ??

[fs, 2017/03/06 22:46:15]

Yes, looks like this needs to move down to *ImageElement. Maybe make a IntSize
sourceSize(const FloatSize& defaultObjectSize) helper in this class though? 

[fserb, 2017/03/07 20:44:02]

did something like that. sourceDefaultSize() and left the rest as is.

+  RefPtr<Image> image = getSourceImageForCanvas(
+      &status, PreferNoAcceleration, SnapshotReasonUnknown, defaultObjectSize);
+  return image->width();
+}
+
+int CanvasHTMLSVGImage::sourceHeight() {
+  SourceImageStatus status;
+  FloatSize defaultObjectSize;
+  RefPtr<Image> image = getSourceImageForCanvas(
+      &status, PreferNoAcceleration, SnapshotReasonUnknown, defaultObjectSize);
+  return image->height();
+}
+
+bool CanvasHTMLSVGImage::isOpaque() const {
+  Image* image = const_cast<Element*>(element())->imageContents();
+  return image && image->currentFrameKnownToBeOpaque();
+}
+
+}  // namespace blink