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nsXFontAAScaledBitmap.h
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00039 
00040 #ifndef nsXFontAAScaledBitmap_h__
00041 #define nsXFontAAScaledBitmap_h__
00042 
00043 #include <gdk/gdk.h>
00044 #include <gdk/gdkx.h>
00045 
00046 #include <X11/Xlib.h>
00047 #include "nspr.h"
00048 #include "nsXFont.h"
00049 #include "nsAntiAliasedGlyph.h"
00050 
00051 extern PRUint8 gAASBDarkTextMinValue;
00052 extern double  gAASBDarkTextGain;
00053 extern PRUint8 gAASBLightTextMinValue;
00054 extern double  gAASBLightTextGain;
00055 
00056 
00057 #define SCALED_SIZE(x) (PRInt32)(rint(((double)(x))*mRatio))
00058 class nsHashtable;
00059 
00060 class nsXFontAAScaledBitmap : public nsXFont {
00061 public:
00062   // we use PRUint16 instead of PRUint32 for the final two arguments in this
00063   // constructor to work around a GCC 2.95[.3] bug which would otherwise cause
00064   // these parameters to be corrupted in the callee.  n.b. at the time of
00065   // writing the only caller is passing PRUint16 values anyway (and within
00066   // the constructor we go on toassign a parameter to a PRUint16-sized member
00067   // variable) so semantically nothing is lost.
00068   nsXFontAAScaledBitmap(Display *aDisplay, int aScreen, GdkFont *,
00069                         PRUint16, PRUint16);
00070   ~nsXFontAAScaledBitmap();
00071 
00072   void         DrawText8(GdkDrawable *Drawable, GdkGC *GC, PRInt32, PRInt32,
00073                          const char *, PRUint32);
00074   void         DrawText16(GdkDrawable *Drawable, GdkGC *GC, PRInt32, PRInt32,
00075                           const XChar2b *, PRUint32);
00076   PRBool       GetXFontProperty(Atom, unsigned long *);
00077   XFontStruct *GetXFontStruct();
00078   PRBool       LoadFont();
00079   void         TextExtents8(const char *, PRUint32, PRInt32*, PRInt32*,
00080                             PRInt32*, PRInt32*, PRInt32*);
00081   void         TextExtents16(const XChar2b *, PRUint32, PRInt32*, PRInt32*,
00082                              PRInt32*, PRInt32*, PRInt32*);
00083   PRInt32      TextWidth8(const char *, PRUint32);
00084   PRInt32      TextWidth16(const XChar2b *, PRUint32);
00085   void         UnloadFont();
00086 
00087 public:
00088   static PRBool InitGlobals(Display *aDisplay, int aScreen);
00089   static void   FreeGlobals();
00090 
00091 protected:
00092   void         DrawText8or16(GdkDrawable *Drawable, GdkGC *GC, PRInt32,
00093                              PRInt32, void *, PRUint32);
00094   void         TextExtents8or16(void *, PRUint32, PRInt32*, PRInt32*,
00095                              PRInt32*, PRInt32*, PRInt32*);
00096   PRBool GetScaledGreyImage(const char *, nsAntiAliasedGlyph **);
00097 #ifdef DEBUG
00098   void dump_XImage_blue_data(XImage *ximage);
00099 #endif
00100   static PRBool DisplayIsLocal(Display *);
00101 
00102 protected:
00103   PRBool       mAlreadyLoaded;
00104   Display     *mDisplay;
00105   GC           mForegroundGC;
00106   GdkFont     *mGdkFont;
00107   nsHashtable* mGlyphHash;
00108   double       mRatio;
00109   XFontStruct  mScaledFontInfo;
00110   GlyphMetrics mScaledMax;
00111   int          mScreen;
00112   Pixmap       mUnscaledBitmap;
00113   XFontStruct *mUnscaledFontInfo;
00114   GlyphMetrics mUnscaledMax;
00115   PRUint16     mUnscaledSize;
00116 
00117 // class globals
00118 protected:
00119   static Display *sDisplay;
00120   static GC       sBackgroundGC; // used to clear the pixmaps
00121                                  // before drawing the glyph
00122   static PRUint8  sWeightedScaleDarkText[256];
00123   static PRUint8  sWeightedScaleLightText[256];
00124 };
00125 
00126 #endif /* nsXFontAAScaledBitmap_h__ */