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nsDrawingSurfacePh.h
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00037 
00038 #ifndef nsDrawingSurfacePh_h___
00039 #define nsDrawingSurfacePh_h___
00040 
00041 #include "nsIDrawingSurface.h"
00042 #include "nsIDrawingSurfacePh.h"
00043 
00044 
00045 class nsDrawingSurfacePh : public nsIDrawingSurface,
00046                            public nsIDrawingSurfacePh
00047 {
00048 public:
00049   nsDrawingSurfacePh();
00050   virtual ~nsDrawingSurfacePh();
00051   
00052   NS_DECL_ISUPPORTS
00053 
00054   //nsIDrawingSurface interface
00055 
00056   NS_IMETHOD Lock(PRInt32 aX, PRInt32 aY, PRUint32 aWidth, PRUint32 aHeight,
00057                   void **aBits, PRInt32 *aStride, PRInt32 *aWidthBytes,
00058                   PRUint32 aFlags);
00059   NS_IMETHOD Unlock(void);
00060 
00061        inline
00062   NS_IMETHODIMP GetDimensions(PRUint32 *aWidth, PRUint32 *aHeight)
00063               {
00064               *aWidth = mWidth;
00065               *aHeight = mHeight;
00066               return NS_OK;
00067               }
00068 
00069   inline NS_IMETHODIMP IsOffscreen( PRBool *aOffScreen ) { *aOffScreen = mIsOffscreen; return NS_OK; }
00070   inline NS_IMETHODIMP IsPixelAddressable( PRBool *aAddressable ) { *aAddressable = PR_FALSE; return NS_OK; }
00071 
00072        inline
00073   NS_IMETHODIMP GetPixelFormat(nsPixelFormat *aFormat)
00074               { 
00075               *aFormat = mPixFormat;
00076               return NS_OK;
00077               }
00078 
00079   //nsIDrawingSurfacePh interface
00080 
00081   /* Initialize a On-Screen Drawing Surface */
00082        inline
00083   NS_IMETHODIMP Init( PhDrawContext_t *aDC, PhGC_t *aGC )
00084               {
00085               mGC = aGC;
00086               mIsOffscreen = PR_FALSE;
00087               mDrawContext =  aDC;
00088               return NS_OK;
00089               }
00090 
00091   /* Initizlize a Off-Screen Drawing Surface */
00092   NS_IMETHOD Init( PRUint32 aWidth, PRUint32 aHeight, PRUint32 aFlags );
00093 
00094   /* Make this DrawingSurface active */
00095   inline PhDrawContext_t* Select( )
00096               {
00097               PgSetGC( NULL );
00098               PhDCSetCurrent( mDrawContext );
00099               PgSetGCCx( mDrawContext, mGC );
00100               return mDrawContext;
00101               }
00102 
00103   /* Flush the Off-Screen draw buffer to the pixmap or PgFlush the On-Screen */
00104   inline PhGC_t                                                       *GetGC( void ) { return mGC; }
00105   inline PhDrawContext_t                  *GetDC( void ) { return mDrawContext; }
00106   inline void                                                         GetSize( PRUint32 *aWidth, PRUint32 *aHeight ) { *aWidth = mWidth; *aHeight = mHeight;}
00107 
00108 private:
00109   PRUint32                                mWidth;
00110   PRUint32                                mHeight;
00111   PRBool                                         mIsOffscreen;
00112   PhGC_t                    *mGC;
00113   PhDrawContext_t           *mDrawContext;
00114   
00115   PRUint32                                mFlags;
00116 
00117   /* for lock & unlock */
00118   PhDrawContext_t           *mLockDrawContext;
00119   PRInt32                                        mLockX;
00120   PRInt32                                        mLockY;
00121   PRUint32                                mLockWidth;
00122   PRUint32                                mLockHeight;
00123   PRUint32                                mLockFlags;
00124   PRBool                                         mLocked;
00125   static nsPixelFormat      mPixFormat;
00126   static int                              prefChanged(const char* aPref, void* aClosure);
00127 };
00128 
00129 #endif