1 /*

     2  *******************************************************************************

     3  *

     4  *   Copyright (C) 1999-2003, International Business Machines

     5  *   Corporation and others.  All Rights Reserved.

     6  *

     7  *******************************************************************************

     8  *   file name:  PortableFontInstance.h

     9  *

    10  *   created on: 11/12/1999

    11  *   created by: Eric R. Mader

    12  */

    13 

    14 #ifndef __PORTABLEFONTINSTANCE_H

    15 #define __PORTABLEFONTINSTANCE_H

    16 

    17 #include <stdio.h>

    18 

    19 #include "layout/LETypes.h"

    20 #include "layout/LEFontInstance.h"

    21 

    22 #include "FontTableCache.h"

    23 

    24 #include "sfnt.h"

    25 #include "cmaps.h"

    26 

    27 class PortableFontInstance : public LEFontInstance, protected FontTableCache

    28 {

    29 private:

    30     FILE *fFile;

    31 

    32     float    fPointSize;

    33     le_int32 fUnitsPerEM;

    34     le_int32 fAscent;

    35     le_int32 fDescent;

    36     le_int32 fLeading;

    37 

    38     const SFNTDirectory *fDirectory;

    39     le_uint16 fDirPower;

    40     le_uint16 fDirExtra;

    41 

    42     float fDeviceScaleX;

    43     float fDeviceScaleY;

    44 

    45     CMAPMapper *fCMAPMapper;

    46 

    47     const HMTXTable *fHMTXTable;

    48     le_uint16 fNumGlyphs;

    49     le_uint16 fNumLongHorMetrics;

    50 

    51     static le_int8 highBit(le_int32 value);

    52 

    53     const DirectoryEntry *findTable(LETag tag) const;

    54     const void *readTable(LETag tag, le_uint32 *length) const;

    55     void deleteTable(const void *table) const;

    56     void getMetrics();

    57 

    58     CMAPMapper *findUnicodeMapper();

    59 

    60 protected:

    61     const void *readFontTable(LETag tableTag) const;

    62 

    63 public:

    64     PortableFontInstance(char *fileName, float pointSize, LEErrorCode &status);

    65 

    66     virtual ~PortableFontInstance();

    67 

    68     virtual const void *getFontTable(LETag tableTag) const;

    69 

    70     virtual le_int32 getUnitsPerEM() const

    71     {

    72         return fUnitsPerEM;

    73     };

    74 

    75     virtual le_int32 getAscent() const

    76     {

    77         return fAscent;

    78     }

    79 

    80     virtual le_int32 getDescent() const

    81     {

    82         return fDescent;

    83     }

    84 

    85     virtual le_int32 getLeading() const

    86     {

    87         return fLeading;

    88     }

    89 

    90     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const

    91     {

    92         return fCMAPMapper->unicodeToGlyph(ch);

    93     }

    94 

    95     virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;

    96 

    97     virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;

    98 

    99     float getXPixelsPerEm() const

   100     {

   101         return fPointSize;

   102     };

   103 

   104     float getYPixelsPerEm() const

   105     {

   106         return fPointSize;

   107     };

   108 

   109     float getScaleFactorX() const

   110     {

   111         return 1.0;

   112     }

   113 

   114     float getScaleFactorY() const

   115     {

   116         return 1.0;

   117     }

   118 

   119 };

   120 

   121 #endif