third_party/WebKit/Source/core/style/StyleFetchedImageSet.cpp

/*
 * Copyright (C) 2012 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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
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#include "core/style/StyleFetchedImageSet.h"

#include "core/css/CSSImageSetValue.h"
#include "core/fetch/ImageResource.h"
#include "core/layout/LayoutObject.h"
#include "core/svg/graphics/SVGImageForContainer.h"

namespace blink {

StyleFetchedImageSet::StyleFetchedImageSet(ImageResource* image,
                                           float imageScaleFactor,
                                           CSSImageSetValue* value,
                                           const KURL& url)
    : m_bestFitImage(image),
      m_imageScaleFactor(imageScaleFactor),
      m_imageSetValue(value),
      m_url(url) {
  m_isImageResourceSet = true;
  m_bestFitImage->addClient(this);
  ThreadState::current()->registerPreFinalizer(this);
}

StyleFetchedImageSet::~StyleFetchedImageSet() {}

void StyleFetchedImageSet::dispose() {
  m_bestFitImage->removeClient(this);
  m_bestFitImage = nullptr;
}

WrappedImagePtr StyleFetchedImageSet::data() const {
  return m_bestFitImage.get();
}

ImageResource* StyleFetchedImageSet::cachedImage() const {
  return m_bestFitImage.get();
}

CSSValue* StyleFetchedImageSet::cssValue() const {
  return m_imageSetValue;
}

CSSValue* StyleFetchedImageSet::computedCSSValue() const {
  return m_imageSetValue->valueWithURLsMadeAbsolute();
}

bool StyleFetchedImageSet::canRender() const {
  return !m_bestFitImage->errorOccurred() &&
         !m_bestFitImage->getImage()->isNull();
}

bool StyleFetchedImageSet::isLoaded() const {
  return m_bestFitImage->isLoaded();
}

bool StyleFetchedImageSet::errorOccurred() const {
  return m_bestFitImage->errorOccurred();
}

LayoutSize StyleFetchedImageSet::imageSize(
    const LayoutObject&,
    float multiplier,
    const LayoutSize& defaultObjectSize) const {
  if (m_bestFitImage->getImage() && m_bestFitImage->getImage()->isSVGImage())
    return imageSizeForSVGImage(toSVGImage(m_bestFitImage->getImage()),
                                multiplier, defaultObjectSize);

  // Image orientation should only be respected for content images,
  // not decorative ones such as StyleImage (backgrounds,
  // border-image, etc.)
  //
  // https://drafts.csswg.org/css-images-3/#the-image-orientation
  LayoutSize scaledImageSize =
      m_bestFitImage->imageSize(DoNotRespectImageOrientation, multiplier);
  scaledImageSize.scale(1 / m_imageScaleFactor);
  return scaledImageSize;
}

bool StyleFetchedImageSet::imageHasRelativeSize() const {
  return m_bestFitImage->imageHasRelativeSize();
}

bool StyleFetchedImageSet::usesImageContainerSize() const {
  return m_bestFitImage->usesImageContainerSize();
}

void StyleFetchedImageSet::addClient(LayoutObject* layoutObject) {
  m_bestFitImage->addObserver(layoutObject);
}

void StyleFetchedImageSet::removeClient(LayoutObject* layoutObject) {
  m_bestFitImage->removeObserver(layoutObject);
}

PassRefPtr<Image> StyleFetchedImageSet::image(const LayoutObject&,
                                              const IntSize& containerSize,
                                              float zoom) const {
  if (!m_bestFitImage->getImage()->isSVGImage())
    return m_bestFitImage->getImage();

  return SVGImageForContainer::create(toSVGImage(m_bestFitImage->getImage()),
                                      containerSize, zoom, m_url);
}

bool StyleFetchedImageSet::knownToBeOpaque(
    const LayoutObject& layoutObject) const {
  TRACE_EVENT1(
      TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data",
      InspectorPaintImageEvent::data(&layoutObject, *m_bestFitImage.get()));
  return m_bestFitImage->getImage()->currentFrameKnownToBeOpaque(
      Image::PreCacheMetadata);
}

DEFINE_TRACE(StyleFetchedImageSet) {
  visitor->trace(m_bestFitImage);
  visitor->trace(m_imageSetValue);
  StyleImage::trace(visitor);
  ResourceClient::trace(visitor);
}

}  // namespace blink