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nsCairoFontMetrics.h
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00001 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00015  * The Original Code is mozilla.org code.
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00017  * The Initial Developer of the Original Code is
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00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Stuart Parmenter <pavlov@pavlov.net>
00024  *   Joe Hewitt <hewitt@netscape.com>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
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00039 
00040 #ifndef NSCAIROFONTMETRICS__H__
00041 #define NSCAIROFONTMETRICS__H__
00042 
00043 #include "nsIFontMetrics.h"
00044 #include "nsCOMPtr.h"
00045 #include "nsIDeviceContext.h"
00046 #include "nsIAtom.h"
00047 
00048 #include <ft2build.h>
00049 #include FT_FREETYPE_H
00050 
00051 class nsCairoFontMetrics : public nsIFontMetrics
00052 {
00053 public:
00054     nsCairoFontMetrics();
00055     virtual ~nsCairoFontMetrics();
00056 
00057     NS_DECL_ISUPPORTS
00058 
00059     NS_IMETHOD  Init(const nsFont& aFont, nsIAtom* aLangGroup,
00060                      nsIDeviceContext *aContext);
00061     NS_IMETHOD  Destroy();
00062     NS_IMETHOD  GetXHeight(nscoord& aResult);
00063     NS_IMETHOD  GetSuperscriptOffset(nscoord& aResult);
00064     NS_IMETHOD  GetSubscriptOffset(nscoord& aResult);
00065     NS_IMETHOD  GetStrikeout(nscoord& aOffset, nscoord& aSize);
00066     NS_IMETHOD  GetUnderline(nscoord& aOffset, nscoord& aSize);
00067     NS_IMETHOD  GetHeight(nscoord &aHeight);
00068     NS_IMETHOD  GetInternalLeading(nscoord &aLeading);
00069     NS_IMETHOD  GetExternalLeading(nscoord &aLeading);
00070     NS_IMETHOD  GetEmHeight(nscoord &aHeight);
00071     NS_IMETHOD  GetEmAscent(nscoord &aAscent);
00072     NS_IMETHOD  GetEmDescent(nscoord &aDescent);
00073     NS_IMETHOD  GetMaxHeight(nscoord &aHeight);
00074     NS_IMETHOD  GetMaxAscent(nscoord &aAscent);
00075     NS_IMETHOD  GetMaxDescent(nscoord &aDescent);
00076     NS_IMETHOD  GetMaxAdvance(nscoord &aAdvance);
00077     NS_IMETHOD  GetLangGroup(nsIAtom** aLangGroup);
00078     NS_IMETHOD  GetFontHandle(nsFontHandle &aHandle);
00079     NS_IMETHOD  GetAveCharWidth(nscoord& aAveCharWidth);
00080     NS_IMETHOD  GetSpaceWidth(nscoord& aSpaceCharWidth);
00081     NS_IMETHOD  GetLeading(nscoord& aLeading);
00082     NS_IMETHOD  GetNormalLineHeight(nscoord& aLineHeight);
00083 
00084 /* local methods */
00085     nscoord MeasureString(const char *aString, PRUint32 aLength);
00086     nscoord MeasureString(const PRUnichar *aString, PRUint32 aLength);
00087 
00088 private:
00089     FT_Face mFace;
00090     nsCOMPtr<nsIDeviceContext> mDeviceContext;
00091     nsCOMPtr<nsIAtom> mLangGroup;
00092     float mDev2App;
00093 
00094     long mMaxAscent;
00095     long mMaxDescent;
00096     short mMaxAdvance;
00097 
00098     long mUnderlineOffset;
00099     long mUnderlineHeight;
00100 };
00101 
00102 #endif /* NSCAIROFONTMETRICS__H__ */