third_party/WebKit/Source/core/style/StyleImage.h

   1 /*
   2  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
   3  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
   4  *           (C) 2000 Dirk Mueller (mueller@kde.org)
   5  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public License
  18  * along with this library; see the file COPYING.LIB.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  * Boston, MA 02110-1301, USA.
  21  *
  22  */
  23
  24 #ifndef StyleImage_h
  25 #define StyleImage_h
  26
  27 #include "core/CoreExport.h"
  28 #include "core/css/CSSValue.h"
  29 #include "platform/geometry/IntSize.h"
  30 #include "platform/geometry/LayoutSize.h"
  31 #include "platform/graphics/Image.h"
  32 #include "wtf/PassRefPtr.h"
  33 #include "wtf/RefCounted.h"
  34 #include "wtf/RefPtr.h"
  35
  36 namespace blink {
  37
  38 class ImageResource;
  39 class CSSValue;
  40 class LayoutObject;
  41
  42 typedef void* WrappedImagePtr;
  43
  44 class CORE_EXPORT StyleImage : public RefCountedWillBeGarbageCollectedFinalized<StyleImage> {
  45 public:
  46     virtual ~StyleImage() { }
  47
  48     bool operator==(const StyleImage& other) const
  49     {
  50         return data() == other.data();
  51     }
  52
  53     virtual PassRefPtrWillBeRawPtr<CSSValue> cssValue() const = 0;
  54     virtual PassRefPtrWillBeRawPtr<CSSValue> computedCSSValue() const = 0;
  55
  56     virtual bool canRender(const LayoutObject&, float /*multiplier*/) const { return true; }
  57     virtual bool isLoaded() const { return true; }
  58     virtual bool errorOccurred() const { return false; }
  59     virtual LayoutSize imageSize(const LayoutObject*, float multiplier) const = 0;
  60     virtual void computeIntrinsicDimensions(const LayoutObject*, Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) = 0;
  61     virtual bool imageHasRelativeWidth() const = 0;
  62     virtual bool imageHasRelativeHeight() const = 0;
  63     virtual bool usesImageContainerSize() const = 0;
  64     virtual void setContainerSizeForLayoutObject(const LayoutObject*, const IntSize&, float) = 0;
  65     virtual void addClient(LayoutObject*) = 0;
  66     virtual void removeClient(LayoutObject*) = 0;
  67     virtual PassRefPtr<Image> image(LayoutObject*, const IntSize&) const = 0;
  68     virtual WrappedImagePtr data() const = 0;
  69     virtual float imageScaleFactor() const { return 1; }
  70     virtual bool knownToBeOpaque(const LayoutObject*) const = 0;
  71     virtual ImageResource* cachedImage() const { return 0; }
  72
  73     ALWAYS_INLINE bool isImageResource() const { return m_isImageResource; }
  74     ALWAYS_INLINE bool isPendingImage() const { return m_isPendingImage; }
  75     ALWAYS_INLINE bool isGeneratedImage() const { return m_isGeneratedImage; }
  76     ALWAYS_INLINE bool isImageResourceSet() const { return m_isImageResourceSet; }
  77
  78     DEFINE_INLINE_VIRTUAL_TRACE() { }
  79
  80 protected:
  81     StyleImage()
  82         : m_isImageResource(false)
  83         , m_isPendingImage(false)
  84         , m_isGeneratedImage(false)
  85         , m_isImageResourceSet(false)
  86     {
  87     }
  88     bool m_isImageResource:1;
  89     bool m_isPendingImage:1;
  90     bool m_isGeneratedImage:1;
  91     bool m_isImageResourceSet:1;
  92 };
  93
  94 #define DEFINE_STYLE_IMAGE_TYPE_CASTS(thisType, function) \
  95     DEFINE_TYPE_CASTS(thisType, StyleImage, styleImage, styleImage->function, styleImage.function); \
  96     inline thisType* to##thisType(const RefPtrWillBeMember<StyleImage>& styleImage) { return to##thisType(styleImage.get()); } \
  97     typedef int NeedsSemiColonAfterDefineStyleImageTypeCasts
  98
  99 }
 100 #endif