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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2006 Allan Sandfeld Jensen (kde (at) carewolf.com)
      5  *           (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com)
      6  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  *
     23  */
     24 
     25 #ifndef RenderImage_h
     26 #define RenderImage_h
     27 
     28 #include "RenderImageResource.h"
     29 #include "RenderReplaced.h"
     30 
     31 namespace WebCore {
     32 
     33 class HTMLAreaElement;
     34 class HTMLMapElement;
     35 
     36 class RenderImage : public RenderReplaced {
     37 public:
     38     RenderImage(Node*);
     39     virtual ~RenderImage();
     40 
     41     void setImageResource(PassOwnPtr<RenderImageResource>);
     42 
     43     RenderImageResource* imageResource() { return m_imageResource.get(); }
     44     const RenderImageResource* imageResource() const { return m_imageResource.get(); }
     45     CachedImage* cachedImage() const { return m_imageResource ? m_imageResource->cachedImage() : 0; }
     46 
     47     bool setImageSizeForAltText(CachedImage* newImage = 0);
     48 
     49     void updateAltText();
     50 
     51     HTMLMapElement* imageMap() const;
     52     void areaElementFocusChanged(HTMLAreaElement*);
     53 
     54     void highQualityRepaintTimerFired(Timer<RenderImage>*);
     55 
     56 protected:
     57     virtual void styleDidChange(StyleDifference, const RenderStyle*);
     58 
     59     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0);
     60 
     61     virtual void paintIntoRect(GraphicsContext*, const IntRect&);
     62     virtual void paint(PaintInfo&, int tx, int ty);
     63 
     64     bool isLogicalWidthSpecified() const;
     65     bool isLogicalHeightSpecified() const;
     66 
     67     virtual void intrinsicSizeChanged()
     68     {
     69         if (m_imageResource)
     70             imageChanged(m_imageResource->imagePtr());
     71     }
     72 
     73 private:
     74     virtual const char* renderName() const { return "RenderImage"; }
     75 
     76     virtual bool isImage() const { return true; }
     77     virtual bool isRenderImage() const { return true; }
     78 
     79     virtual void paintReplaced(PaintInfo&, int tx, int ty);
     80 
     81     virtual int minimumReplacedHeight() const;
     82 
     83     virtual void notifyFinished(CachedResource*);
     84     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
     85 
     86     virtual int computeReplacedLogicalWidth(bool includeMaxWidth = true) const;
     87     virtual int computeReplacedLogicalHeight() const;
     88 
     89     IntSize imageSizeForError(CachedImage*) const;
     90     void imageDimensionsChanged(bool imageSizeChanged, const IntRect* = 0);
     91 
     92     int calcAspectRatioLogicalWidth() const;
     93     int calcAspectRatioLogicalHeight() const;
     94 
     95     void paintAreaElementFocusRing(PaintInfo&);
     96 
     97     // Text to display as long as the image isn't available.
     98     String m_altText;
     99     OwnPtr<RenderImageResource> m_imageResource;
    100     bool m_needsToSetSizeForAltText;
    101 
    102     friend class RenderImageScaleObserver;
    103 };
    104 
    105 inline RenderImage* toRenderImage(RenderObject* object)
    106 {
    107     ASSERT(!object || object->isRenderImage());
    108     return static_cast<RenderImage*>(object);
    109 }
    110 
    111 inline const RenderImage* toRenderImage(const RenderObject* object)
    112 {
    113     ASSERT(!object || object->isRenderImage());
    114     return static_cast<const RenderImage*>(object);
    115 }
    116 
    117 // This will catch anyone doing an unnecessary cast.
    118 void toRenderImage(const RenderImage*);
    119 
    120 } // namespace WebCore
    121 
    122 #endif // RenderImage_h
    123