ftfonts.h

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// $Id: ftfonts.h 1138 2006-05-19 17:42:05Z gerry $
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 */
// Header file for FreeType Font manager. This font manager provides access to
// scalable fonts supported by FreeType (via Pango, fontconfig and FreeType)

/*
*/

#ifndef INC_FTFONTS
#define INC_FTFONTS

#include "fontbase.h"

// Forward definitions
class OILEnumFonts;

/********************************************************************************************
>   class FTFont : public FontBase
            
    Author:     Martin Wuerthner <xara@mw-software.com>
    Created:    22/02/06
    Purpose:    A class description of a font managed by FreeType.
********************************************************************************************/

class FTFont : public FontBase
{
    CC_DECLARE_DYNCREATE(FTFont)

public:
     FTFont(FontClass fc = FC_UNDEFINED);
    ~FTFont();

    virtual FontClass GetFontClass() { return m_FontClass; };
    virtual void Dump();
 private:
    // fonts managed by FreeType can be TrueType fonts or Type1 fonts
    FontClass m_FontClass;
};

/********************************************************************************************

>   class FTFontCacheEntry
            
    Author:     Martin Wuerthner <xara@mw-software.com>
    Created:    19/05/06
    Purpose:    an entry in the new font list cache - used as the value part of a key/value
                pair where the key is the face name wrapped in an ENUMLOGFONT structure

********************************************************************************************/

class FTFontCacheEntry
{
 public:
    FontClass m_Class;
    BOOL m_Referenced;               // used during recaching

    FTFontCacheEntry(FontClass Class, BOOL Referenced):
        m_Class(Class), m_Referenced(Referenced) {}
    FTFontCacheEntry(): m_Class(FC_UNDEFINED), m_Referenced(FALSE) {}
};

// we need to be able to compare ENUMLOGFONTs so we can use them as the keys of a map
bool operator<(ENUMLOGFONT &e1, ENUMLOGFONT &e2);

// Our font list cache is simply a map from font name to class (plus flags).
// This allows us to add/list entries easily and find out whether a specific
// font is in the cache in logarithmic time (for incremental cache updates).
// Using ENUMLOGFONTs as keys allows us to enumerate fonts more efficiently
// because the Kernel expects to be passed ENUMLOGFONT structures.
typedef map<ENUMLOGFONT,FTFontCacheEntry> FTFontCache;

/********************************************************************************************

>   class FTFontMan : public CCObject
            
    Author:     Martin Wuerthner <xara@mw-software.com>
    Created:    22/02/06
    Purpose:    A static class to allow access to fonts managed by FreeType.

********************************************************************************************/

class FTFontMan : public CCObject
{
    CC_DECLARE_DYNCREATE(FTFontMan)

    friend class OILFontMan;

// constructor
public:
    FTFontMan();

    static BOOL     GetAscentDescent(CharDescription& ChDesc, INT32* pAscent, INT32* pDescent);
    static BOOL     GetCharWidth(CharDescription& ChDesc, TCHAR FirstChar, TCHAR LastChar, INT32* pCharWidthsBuf);
    static INT32    GetCharsKerning(CharDescription& FontDesc, TCHAR LeftChar, TCHAR RightChar);

// the support interface (functions in class OILFontMan will use these)
private:
    static BOOL     IsOkToCall();
    static BOOL     CacheNamedFont(String_64* pFont);
    static BOOL     CacheCompatibleFont(String_64* pFont);
    static void     ValidateCache();
    static void     FindClosestFont();
    static FTFont*  CreateNewFont(String_64* pFontName, FontClass Class);

    // extract the Panose information
    static OUTLINETEXTMETRIC* GetOutlineTextMetric(LOGFONT *pLogFont);

    // get a vector representation of a glyph
    static BOOL     GetCharOutline(CharDescription& ChDesc, 
                                   DocCoord** ppCoords,
                                   PathVerb** ppVerbs,
                                   UINT32* pNumCoords,
                                   wxDC* pDC);
// utterly private
private:
    static BOOL CacheFontCore(String_64* pFont, BOOL compatible);

    // the font list cache - a cache of enumerated fonts
    // do not confuse this with the kernel's font cache
    // (which holds the fonts that have been used)
    static FTFontCache* m_cache;

// function called by class EnumFonts as a method for the kernel to enumerate all the installed fonts
public:
    static void     EnumAllFonts(OILEnumFonts* pClass);

    // get a font class for a face name (FC_TRUETYPE or FC_ATM) - returns FC_UNDEFINED
    // for non-scalable or virtual fonts or fonts that are not present
    static FontClass GetFontClass(String_64& FaceName);

    // routines for the font list cache - a cache of enumerated fonts
    // do not confuse this with the kernel's font cache
    static void AddFontToCache(ENUMLOGFONT& EnumLogFont);
    static BOOL FontIsCached(ENUMLOGFONT &EnumLogFont);
    static void UpdateCache();
};

#endif

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