gfx/public/nsDeviceContext.h

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   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
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  15  * The Original Code is mozilla.org code.
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  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s):
  23  *   Roland Mainz <Roland.Mainz@informatik.med.uni-giessen.de>
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  25  * Alternatively, the contents of this file may be used under the terms of
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #ifndef nsDeviceContext_h___
  40 #define nsDeviceContext_h___
  41
  42 #include "nsIDeviceContext.h"
  43 #include "nsIDeviceContextSpec.h"
  44 #include "nsCOMPtr.h"
  45 #include "nsIAtom.h"
  46 #include "nsVoidArray.h"
  47 #include "nsIObserver.h"
  48 #include "nsIObserverService.h"
  49 #include "nsWeakReference.h"
  50 #include "gfxCore.h"
  51
  52 class nsIImageRequest;
  53 class nsHashtable;
  54
  55 class NS_GFX nsFontCache
  56 {
  57 public:
  58   nsFontCache();
  59   virtual ~nsFontCache();
  60
  61   virtual nsresult Init(nsIDeviceContext* aContext);
  62   virtual nsresult GetDeviceContext(nsIDeviceContext *&aContext) const;
  63   virtual nsresult GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
  64                                  nsIFontMetrics *&aMetrics, gfxUserFontSet *aUserFontSet = nsnull);
  65
  66   nsresult   FontMetricsDeleted(const nsIFontMetrics* aFontMetrics);
  67   nsresult   Compact();
  68   nsresult   Flush();
  69   /* printer device context classes may create their own
  70    * subclasses of nsFontCache (and override this method) and override
  71    * DeviceContextImpl::CreateFontCache (see bug 81311).
  72    */
  73   virtual nsresult CreateFontMetricsInstance(nsIFontMetrics** fm);
  74
  75 protected:
  76   nsVoidArray      mFontMetrics;
  77   nsIDeviceContext *mContext; // we do not addref this since
  78                               // ownership is implied. MMP.
  79 };
  80
  81 // inherit visibility from the NS_GFX class declaration
  82 #undef IMETHOD_VISIBILITY
  83 #define IMETHOD_VISIBILITY
  84
  85 class NS_GFX DeviceContextImpl : public nsIDeviceContext,
  86                                  public nsIObserver,
  87                                  public nsSupportsWeakReference
  88 {
  89 public:
  90   DeviceContextImpl();
  91
  92   NS_DECL_ISUPPORTS
  93   NS_DECL_NSIOBSERVER
  94
  95   NS_IMETHOD  Init(nsNativeWidget aWidget);
  96
  97   NS_IMETHOD  CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext);
  98   NS_IMETHOD  CreateRenderingContext(nsIWidget *aWidget, nsIRenderingContext *&aContext);
  99   NS_IMETHOD  CreateRenderingContext(nsIRenderingContext *&aContext){return NS_ERROR_NOT_IMPLEMENTED;}
 100   NS_IMETHOD  CreateRenderingContextInstance(nsIRenderingContext *&aContext);
 101
 102   NS_IMETHOD  GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
 103                             nsIFontMetrics*& aMetrics, gfxUserFontSet *aUserFontSet = nsnull);
 104   NS_IMETHOD  GetMetricsFor(const nsFont& aFont, nsIFontMetrics*& aMetrics,
 105                             gfxUserFontSet *aUserFontSet = nsnull);
 106
 107   NS_IMETHOD FirstExistingFont(const nsFont& aFont, nsString& aFaceName);
 108
 109   NS_IMETHOD GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
 110                               PRBool& aAliased);
 111
 112   NS_IMETHOD CreateFontCache();
 113   NS_IMETHOD FontMetricsDeleted(const nsIFontMetrics* aFontMetrics);
 114   NS_IMETHOD FlushFontCache(void);
 115
 116   NS_IMETHOD GetDepth(PRUint32& aDepth);
 117
 118   NS_IMETHOD GetPaletteInfo(nsPaletteInfo& aPaletteInfo);
 119
 120   NS_IMETHOD PrepareDocument(PRUnichar * aTitle,
 121                              PRUnichar*  aPrintToFileName) { return NS_OK; }
 122   NS_IMETHOD AbortDocument(void) { return NS_OK; }
 123
 124   NS_IMETHOD PrepareNativeWidget(nsIWidget *aWidget, void **aOut);
 125   NS_IMETHOD ClearCachedSystemFonts();
 126
 127 private:
 128   /* Helper methods for |CreateRenderingContext|&co. */
 129   nsresult InitRenderingContext(nsIRenderingContext *aContext, nsIWidget *aWindow);
 130
 131 protected:
 132   virtual ~DeviceContextImpl();
 133
 134   void CommonInit(void);
 135   nsresult CreateIconILGroupContext();
 136   virtual nsresult CreateFontAliasTable();
 137   nsresult AliasFont(const nsString& aFont,
 138                      const nsString& aAlias, const nsString& aAltAlias,
 139                      PRBool aForceAlias);
 140   void GetLocaleLangGroup(void);
 141
 142   nsFontCache       *mFontCache;
 143   nsCOMPtr<nsIAtom> mLocaleLangGroup; // XXX temp fix for performance bug - erik
 144   nsHashtable*      mFontAliasTable;
 145
 146 public:
 147   nsNativeWidget    mWidget;
 148 #ifdef NS_DEBUG
 149   PRBool            mInitialized;
 150 #endif
 151 };
 152
 153 #undef IMETHOD_VISIBILITY
 154 #define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
 155
 156 #endif /* nsDeviceContext_h___ */