third_party/WebKit/Source/core/layout/LayoutImageResource.cpp

/*
 * Copyright (C) 1999 Lars Knoll <knoll@kde.org>
 * Copyright (C) 1999 Antti Koivisto <koivisto@kde.org>
 * Copyright (C) 2000 Dirk Mueller <mueller@kde.org>
 * Copyright (C) 2006 Allan Sandfeld Jensen <kde@carewolf.com>
 * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc.
 *               All rights reserved.
 * Copyright (C) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
 *
 * 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/layout/LayoutImageResource.h"

#include "core/dom/Element.h"
#include "core/layout/LayoutImage.h"
#include "core/svg/graphics/SVGImageForContainer.h"

namespace blink {

LayoutImageResource::LayoutImageResource()
    : m_layoutObject(nullptr), m_cachedImage(nullptr) {}

LayoutImageResource::~LayoutImageResource() {}

void LayoutImageResource::initialize(LayoutObject* layoutObject) {
  ASSERT(!m_layoutObject);
  ASSERT(layoutObject);
  m_layoutObject = layoutObject;
}

void LayoutImageResource::shutdown() {
  ASSERT(m_layoutObject);

  if (!m_cachedImage)
    return;
  m_cachedImage->removeObserver(m_layoutObject);
}

void LayoutImageResource::setImageResource(ImageResourceContent* newImage) {
  ASSERT(m_layoutObject);

  if (m_cachedImage == newImage)
    return;

  if (m_cachedImage) {
    m_cachedImage->removeObserver(m_layoutObject);
  }
  m_cachedImage = newImage;
  if (m_cachedImage) {
    m_cachedImage->addObserver(m_layoutObject);
    if (m_cachedImage->errorOccurred())
      m_layoutObject->imageChanged(m_cachedImage.get());
  } else {
    m_layoutObject->imageChanged(m_cachedImage.get());
  }
}

void LayoutImageResource::resetAnimation() {
  ASSERT(m_layoutObject);

  if (!m_cachedImage)
    return;

  m_cachedImage->getImage()->resetAnimation();

  m_layoutObject->setShouldDoFullPaintInvalidation();
}

LayoutSize LayoutImageResource::imageSize(float multiplier) const {
  if (!m_cachedImage)
    return LayoutSize();
  LayoutSize size = m_cachedImage->imageSize(
      LayoutObject::shouldRespectImageOrientation(m_layoutObject), multiplier);
  if (m_layoutObject && m_layoutObject->isLayoutImage() && size.width() &&
      size.height())
    size.scale(toLayoutImage(m_layoutObject)->imageDevicePixelRatio());
  return size;
}

PassRefPtr<Image> LayoutImageResource::image(const IntSize& containerSize,
                                             float zoom) const {
  if (!m_cachedImage)
    return Image::nullImage();

  if (!m_cachedImage->getImage()->isSVGImage())
    return m_cachedImage->getImage();

  KURL url;
  SVGImage* svgImage = toSVGImage(m_cachedImage->getImage());
  Node* node = m_layoutObject->node();
  if (node && node->isElementNode()) {
    const AtomicString& urlString = toElement(node)->imageSourceURL();
    url = node->document().completeURL(urlString);
  }
  return SVGImageForContainer::create(svgImage, containerSize, zoom, url);
}

bool LayoutImageResource::maybeAnimated() const {
  Image* image = m_cachedImage ? m_cachedImage->getImage() : Image::nullImage();
  return image->maybeAnimated();
}

}  // namespace blink