third_party/WebKit/Source/core/css/CSSImageGeneratorValue.cpp

/*
 * Copyright (C) 2008 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 "core/css/CSSImageGeneratorValue.h"

#include "core/css/CSSCrossfadeValue.h"
#include "core/css/CSSGradientValue.h"
#include "core/css/CSSPaintValue.h"
#include "platform/graphics/Image.h"

namespace blink {

using cssvalue::ToCSSCrossfadeValue;
using cssvalue::ToCSSConicGradientValue;
using cssvalue::ToCSSLinearGradientValue;
using cssvalue::ToCSSRadialGradientValue;

Image* GeneratedImageCache::GetImage(const LayoutSize& size) const {
  if (size.IsEmpty())
    return nullptr;
  return images_.at(size);
}

void GeneratedImageCache::PutImage(const LayoutSize& size,
                                   scoped_refptr<Image> image) {
  images_.insert(size, std::move(image));
}

void GeneratedImageCache::AddSize(const LayoutSize& size) {
  if (size.IsEmpty())
    return;
  sizes_.insert(size);
}

void GeneratedImageCache::RemoveSize(const LayoutSize& size) {
  if (size.IsEmpty())
    return;
  if (sizes_.erase(size))
    images_.erase(size);
}

CSSImageGeneratorValue::CSSImageGeneratorValue(ClassType class_type)
    : CSSValue(class_type) {}

CSSImageGeneratorValue::~CSSImageGeneratorValue() = default;

void CSSImageGeneratorValue::AddClient(const ImageResourceObserver* client,
                                       const LayoutSize& size) {
  DCHECK(client);
  if (clients_.IsEmpty()) {
    DCHECK(!keep_alive_);
    keep_alive_ = this;
  }

  cached_images_.AddSize(size);

  ClientSizeCountMap::iterator it = clients_.find(client);
  if (it == clients_.end()) {
    clients_.insert(client, SizeAndCount(size, 1));
  } else {
    SizeAndCount& size_count = it->value;
    ++size_count.count;
  }
}

CSSImageGeneratorValue* CSSImageGeneratorValue::ValueWithURLsMadeAbsolute() {
  if (IsCrossfadeValue())
    return ToCSSCrossfadeValue(this)->ValueWithURLsMadeAbsolute();
  return this;
}

void CSSImageGeneratorValue::RemoveClient(const ImageResourceObserver* client) {
  DCHECK(client);
  ClientSizeCountMap::iterator it = clients_.find(client);
  SECURITY_DCHECK(it != clients_.end());

  SizeAndCount& size_count = it->value;
  cached_images_.RemoveSize(size_count.size);

  if (!--size_count.count)
    clients_.erase(client);

  if (clients_.IsEmpty()) {
    DCHECK(keep_alive_);
    keep_alive_.Clear();
  }
}

Image* CSSImageGeneratorValue::GetImage(const ImageResourceObserver* client,
                                        const LayoutSize& size) {
  ClientSizeCountMap::iterator it = clients_.find(client);
  if (it != clients_.end()) {
    DCHECK(keep_alive_);
    SizeAndCount& size_count = it->value;
    if (size_count.size != size) {
      cached_images_.RemoveSize(size_count.size);
      cached_images_.AddSize(size);

      // If there's only one use for this client, then update the size.
      if (size_count.count == 1)
        size_count.size = size;
    }
  }
  return cached_images_.GetImage(size);
}

void CSSImageGeneratorValue::PutImage(const LayoutSize& size,
                                      scoped_refptr<Image> image) {
  cached_images_.PutImage(size, std::move(image));
}

scoped_refptr<Image> CSSImageGeneratorValue::GetImage(
    const ImageResourceObserver& client,
    const Document& document,
    const ComputedStyle& style,
    const LayoutSize& container_size) {
  switch (GetClassType()) {
    case kCrossfadeClass:
      return ToCSSCrossfadeValue(this)->GetImage(client, document, style,
                                                 container_size);
    case kLinearGradientClass:
      return ToCSSLinearGradientValue(this)->GetImage(client, document, style,
                                                      container_size);
    case kPaintClass:
      return ToCSSPaintValue(this)->GetImage(client, document, style,
                                             container_size);
    case kRadialGradientClass:
      return ToCSSRadialGradientValue(this)->GetImage(client, document, style,
                                                      container_size);
    case kConicGradientClass:
      return ToCSSConicGradientValue(this)->GetImage(client, document, style,
                                                     container_size);
    default:
      NOTREACHED();
  }
  return nullptr;
}

bool CSSImageGeneratorValue::IsFixedSize() const {
  switch (GetClassType()) {
    case kCrossfadeClass:
      return ToCSSCrossfadeValue(this)->IsFixedSize();
    case kLinearGradientClass:
      return ToCSSLinearGradientValue(this)->IsFixedSize();
    case kPaintClass:
      return ToCSSPaintValue(this)->IsFixedSize();
    case kRadialGradientClass:
      return ToCSSRadialGradientValue(this)->IsFixedSize();
    case kConicGradientClass:
      return ToCSSConicGradientValue(this)->IsFixedSize();
    default:
      NOTREACHED();
  }
  return false;
}

FloatSize CSSImageGeneratorValue::FixedSize(
    const Document& document,
    const FloatSize& default_object_size) {
  switch (GetClassType()) {
    case kCrossfadeClass:
      return ToCSSCrossfadeValue(this)->FixedSize(document,
                                                  default_object_size);
    case kLinearGradientClass:
      return ToCSSLinearGradientValue(this)->FixedSize(document);
    case kPaintClass:
      return ToCSSPaintValue(this)->FixedSize(document);
    case kRadialGradientClass:
      return ToCSSRadialGradientValue(this)->FixedSize(document);
    case kConicGradientClass:
      return ToCSSConicGradientValue(this)->FixedSize(document);
    default:
      NOTREACHED();
  }
  return FloatSize();
}

bool CSSImageGeneratorValue::IsPending() const {
  switch (GetClassType()) {
    case kCrossfadeClass:
      return ToCSSCrossfadeValue(this)->IsPending();
    case kLinearGradientClass:
      return ToCSSLinearGradientValue(this)->IsPending();
    case kPaintClass:
      return ToCSSPaintValue(this)->IsPending();
    case kRadialGradientClass:
      return ToCSSRadialGradientValue(this)->IsPending();
    case kConicGradientClass:
      return ToCSSConicGradientValue(this)->IsPending();
    default:
      NOTREACHED();
  }
  return false;
}

bool CSSImageGeneratorValue::KnownToBeOpaque(const Document& document,
                                             const ComputedStyle& style) const {
  switch (GetClassType()) {
    case kCrossfadeClass:
      return ToCSSCrossfadeValue(this)->KnownToBeOpaque(document, style);
    case kLinearGradientClass:
      return ToCSSLinearGradientValue(this)->KnownToBeOpaque(document, style);
    case kPaintClass:
      return ToCSSPaintValue(this)->KnownToBeOpaque(document, style);
    case kRadialGradientClass:
      return ToCSSRadialGradientValue(this)->KnownToBeOpaque(document, style);
    case kConicGradientClass:
      return ToCSSConicGradientValue(this)->KnownToBeOpaque(document, style);
    default:
      NOTREACHED();
  }
  return false;
}

void CSSImageGeneratorValue::LoadSubimages(const Document& document) {
  switch (GetClassType()) {
    case kCrossfadeClass:
      ToCSSCrossfadeValue(this)->LoadSubimages(document);
      break;
    case kLinearGradientClass:
      ToCSSLinearGradientValue(this)->LoadSubimages(document);
      break;
    case kPaintClass:
      ToCSSPaintValue(this)->LoadSubimages(document);
      break;
    case kRadialGradientClass:
      ToCSSRadialGradientValue(this)->LoadSubimages(document);
      break;
    case kConicGradientClass:
      ToCSSConicGradientValue(this)->LoadSubimages(document);
      break;
    default:
      NOTREACHED();
  }
}

}  // namespace blink