| /* |
| * 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. |
| */ |
| |
| #ifndef CSSImageGeneratorValue_h |
| #define CSSImageGeneratorValue_h |
| |
| #include "base/memory/scoped_refptr.h" |
| #include "core/CoreExport.h" |
| #include "core/css/CSSValue.h" |
| #include "platform/geometry/LayoutSizeHash.h" |
| #include "platform/heap/SelfKeepAlive.h" |
| #include "platform/wtf/HashCountedSet.h" |
| |
| namespace blink { |
| |
| class Document; |
| class Image; |
| class FloatSize; |
| class ComputedStyle; |
| class ImageResourceObserver; |
| |
| class GeneratedImageCache { |
| public: |
| void AddSize(const LayoutSize&); |
| void RemoveSize(const LayoutSize&); |
| |
| Image* GetImage(const LayoutSize&) const; |
| void PutImage(const LayoutSize&, scoped_refptr<Image>); |
| |
| private: |
| // A count of how many times a given image size is in use. |
| HashCountedSet<LayoutSize> sizes_; |
| |
| // A cache of Image objects by image size. |
| HashMap<LayoutSize, scoped_refptr<Image>> images_; |
| }; |
| |
| struct SizeAndCount { |
| DISALLOW_NEW(); |
| SizeAndCount(LayoutSize new_size = LayoutSize(), int new_count = 0) |
| : size(new_size), count(new_count) {} |
| |
| LayoutSize size; |
| int count; |
| }; |
| |
| using ClientSizeCountMap = HashMap<const ImageResourceObserver*, SizeAndCount>; |
| |
| class CORE_EXPORT CSSImageGeneratorValue : public CSSValue { |
| public: |
| ~CSSImageGeneratorValue(); |
| |
| void AddClient(const ImageResourceObserver*, const LayoutSize&); |
| void RemoveClient(const ImageResourceObserver*); |
| // The |container_size| is the container size with subpixel snapping. |
| scoped_refptr<Image> GetImage(const ImageResourceObserver&, |
| const Document&, |
| const ComputedStyle&, |
| const LayoutSize& container_size); |
| |
| bool IsFixedSize() const; |
| FloatSize FixedSize(const Document&, const FloatSize& default_object_size); |
| |
| bool IsPending() const; |
| bool KnownToBeOpaque(const Document&, const ComputedStyle&) const; |
| |
| void LoadSubimages(const Document&); |
| |
| CSSImageGeneratorValue* ValueWithURLsMadeAbsolute(); |
| |
| void TraceAfterDispatch(blink::Visitor* visitor) { |
| CSSValue::TraceAfterDispatch(visitor); |
| } |
| |
| protected: |
| explicit CSSImageGeneratorValue(ClassType); |
| |
| Image* GetImage(const ImageResourceObserver*, const LayoutSize&); |
| void PutImage(const LayoutSize&, scoped_refptr<Image>); |
| const ClientSizeCountMap& Clients() const { return clients_; } |
| |
| // A map from LayoutObjects (with entry count) to image sizes. |
| ClientSizeCountMap clients_; |
| |
| // Cached image instances. |
| GeneratedImageCache cached_images_; |
| |
| // TODO(Oilpan): when/if we can make the layoutObject point directly to the |
| // CSSImageGenerator value using a member we don't need to have this hack |
| // where we keep a persistent to the instance as long as there are clients in |
| // the ClientSizeCountMap. |
| SelfKeepAlive<CSSImageGeneratorValue> keep_alive_; |
| }; |
| |
| DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageGeneratorValue, IsImageGeneratorValue()); |
| |
| } // namespace blink |
| |
| #endif // CSSImageGeneratorValue_h |