Loading: move ImageResource and related classes to core/loader/resource

third_party/WebKit/Source/core/fetch/ImageResourceContent.h

-// Copyright 2016 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.
-
-#ifndef ImageResourceContent_h
-#define ImageResourceContent_h
-
-#include "core/CoreExport.h"
-#include "core/fetch/ResourceStatus.h"
-#include "platform/geometry/IntRect.h"
-#include "platform/geometry/IntSizeHash.h"
-#include "platform/geometry/LayoutSize.h"
-#include "platform/graphics/Image.h"
-#include "platform/graphics/ImageObserver.h"
-#include "platform/graphics/ImageOrientation.h"
-#include "platform/network/ResourceLoadPriority.h"
-#include "platform/weborigin/KURL.h"
-#include "wtf/HashCountedSet.h"
-#include "wtf/HashMap.h"
-#include <memory>
-
-namespace blink {
-
-class FetchRequest;
-class ImageResourceInfo;
-class ImageResourceObserver;
-class ResourceError;
-class ResourceFetcher;
-class ResourceResponse;
-class SecurityOrigin;
-
-// ImageResourceContent is a container that holds fetch result of
-// an ImageResource in a decoded form.
-// Classes that use the fetched images
-// should hold onto this class and/or inherit ImageResourceObserver,
-// instead of holding onto ImageResource or inheriting ResourceClient.
-// https://docs.google.com/document/d/1O-fB83mrE0B_V8gzXNqHgmRLCvstTB4MMi3RnVLr8bE/edit?usp=sharing
-// TODO(hiroshige): Make ImageResourceContent ResourceClient and remove the
-// word 'observer' from ImageResource.
-// TODO(hiroshige): Rename local variables of type ImageResourceContent to
-// e.g. |imageContent|. Currently they have Resource-like names.
-class CORE_EXPORT ImageResourceContent final
-    : public GarbageCollectedFinalized<ImageResourceContent>,
-      public ImageObserver {
-  USING_GARBAGE_COLLECTED_MIXIN(ImageResourceContent);
-
- public:
-  static ImageResourceContent* create(
-      PassRefPtr<blink::Image> image = nullptr) {
-    return new ImageResourceContent(std::move(image));
-  }
-  static ImageResourceContent* fetch(FetchRequest&, ResourceFetcher*);
-
-  // Returns the nullImage() if the image is not available yet.
-  blink::Image* getImage();
-  bool hasImage() const { return m_image.get(); }
-
-  static std::pair<blink::Image*, float> brokenImage(
-      float deviceScaleFactor);  // Returns an image and the image's resolution
-                                 // scale factor.
-
-  bool usesImageContainerSize() const;
-  bool imageHasRelativeSize() const;
-  // The device pixel ratio we got from the server for this image, or 1.0.
-  float devicePixelRatioHeaderValue() const;
-  bool hasDevicePixelRatioHeaderValue() const;
-
-  enum SizeType {
-    // Report the intrinsic size.
-    IntrinsicSize,
-
-    // Report the intrinsic size corrected to account for image density.
-    IntrinsicCorrectedToDPR,
-  };
-
-  // This method takes a zoom multiplier that can be used to increase the
-  // natural size of the image by the zoom.
-  LayoutSize imageSize(
-      RespectImageOrientationEnum shouldRespectImageOrientation,
-      float multiplier,
-      SizeType = IntrinsicSize);
-
-  void updateImageAnimationPolicy();
-
-  void addObserver(ImageResourceObserver*);
-  void removeObserver(ImageResourceObserver*);
-
-  DECLARE_TRACE();
-
-  // Redirecting methods to Resource.
-  const KURL& url() const;
-  bool isAccessAllowed(SecurityOrigin*);
-  const ResourceResponse& response() const;
-  bool isLoaded() const;
-  bool isLoading() const;
-  bool errorOccurred() const;
-  bool loadFailedOrCanceled() const;
-  ResourceStatus getStatus() const;
-  const ResourceError& resourceError() const;
-
-  // For FrameSerializer.
-  bool hasCacheControlNoStoreHeader() const;
-
-  void emulateLoadStartedForInspector(ResourceFetcher*,
-                                      const KURL&,
-                                      const AtomicString& initiatorName);
-
-  void setNotRefetchableDataFromDiskCache() {
-    m_isRefetchableDataFromDiskCache = false;
-  }
-
-  // For ImageResource only.
-  void setImageResourceInfo(ImageResourceInfo*);
-  enum ClearImageOption { ClearExistingImage, KeepExistingImage };
-  void updateImage(PassRefPtr<SharedBuffer>,
-                   ClearImageOption,
-                   bool allDataReceived);
-  enum NotifyFinishOption { ShouldNotifyFinish, DoNotNotifyFinish };
-  void clearImage();
-  void clearImageAndNotifyObservers(NotifyFinishOption);
-  ResourcePriority priorityFromObservers() const;
-  void destroyDecodedData();
-  void doResetAnimation();
-  PassRefPtr<const SharedBuffer> resourceBuffer() const;
-  bool shouldUpdateImageImmediately() const;
-  bool hasObservers() const {
-    return !m_observers.isEmpty() || !m_finishedObservers.isEmpty();
-  }
-  bool isRefetchableDataFromDiskCache() const {
-    return m_isRefetchableDataFromDiskCache;
-  }
-
- private:
-  explicit ImageResourceContent(PassRefPtr<blink::Image> = nullptr);
-
-  // ImageObserver
-  void decodedSizeChangedTo(const blink::Image*, size_t newSize) override;
-  bool shouldPauseAnimation(const blink::Image*) override;
-  void animationAdvanced(const blink::Image*) override;
-  void changedInRect(const blink::Image*, const IntRect&) override;
-
-  PassRefPtr<Image> createImage();
-
-  // If not null, changeRect is the changed part of the image.
-  void notifyObservers(NotifyFinishOption, const IntRect* changeRect = nullptr);
-  void markObserverFinished(ImageResourceObserver*);
-
-  Member<ImageResourceInfo> m_info;
-
-  RefPtr<blink::Image> m_image;
-
-  HashCountedSet<ImageResourceObserver*> m_observers;
-  HashCountedSet<ImageResourceObserver*> m_finishedObservers;
-
-  Image::SizeAvailability m_sizeAvailable = Image::SizeUnavailable;
-
-  // Indicates if this resource's encoded image data can be purged and refetched
-  // from disk cache to save memory usage. See crbug/664437.
-  bool m_isRefetchableDataFromDiskCache;
-};
-
-}  // namespace blink
-
-#endif