icuSources/test/letest/PortableFontInstance.h

   1
   2 /*
   3  *******************************************************************************
   4  *
   5  *   Copyright (C) 1999-2003, International Business Machines
   6  *   Corporation and others.  All Rights Reserved.
   7  *
   8  *******************************************************************************
   9  *   file name:  PortableFontInstance.h
  10  *
  11  *   created on: 11/12/1999
  12  *   created by: Eric R. Mader
  13  */
  14
  15 #ifndef __PORTABLEFONTINSTANCE_H
  16 #define __PORTABLEFONTINSTANCE_H
  17
  18 #include <stdio.h>
  19
  20 #include "layout/LETypes.h"
  21 #include "layout/LEFontInstance.h"
  22
  23 #include "FontTableCache.h"
  24
  25 #include "sfnt.h"
  26 #include "cmaps.h"
  27
  28 class PortableFontInstance : public LEFontInstance, protected FontTableCache
  29 {
  30 private:
  31     FILE *fFile;
  32
  33     float    fPointSize;
  34     le_int32 fUnitsPerEM;
  35     le_int32 fAscent;
  36     le_int32 fDescent;
  37     le_int32 fLeading;
  38
  39     const SFNTDirectory *fDirectory;
  40     le_uint16 fDirPower;
  41     le_uint16 fDirExtra;
  42
  43     float fDeviceScaleX;
  44     float fDeviceScaleY;
  45
  46     CMAPMapper *fCMAPMapper;
  47
  48     const HMTXTable *fHMTXTable;
  49     le_uint16 fNumGlyphs;
  50     le_uint16 fNumLongHorMetrics;
  51
  52     static le_int8 highBit(le_int32 value);
  53
  54     const DirectoryEntry *findTable(LETag tag) const;
  55     const void *readTable(LETag tag, le_uint32 *length) const;
  56     void deleteTable(const void *table) const;
  57     void getMetrics();
  58
  59     CMAPMapper *findUnicodeMapper();
  60
  61 protected:
  62     const void *readFontTable(LETag tableTag) const;
  63
  64 public:
  65     PortableFontInstance(char *fileName, float pointSize, LEErrorCode &status);
  66
  67     virtual ~PortableFontInstance();
  68
  69     virtual const void *getFontTable(LETag tableTag) const;
  70
  71     virtual le_int32 getUnitsPerEM() const
  72     {
  73         return fUnitsPerEM;
  74     };
  75
  76     virtual le_int32 getAscent() const
  77     {
  78         return fAscent;
  79     }
  80
  81     virtual le_int32 getDescent() const
  82     {
  83         return fDescent;
  84     }
  85
  86     virtual le_int32 getLeading() const
  87     {
  88         return fLeading;
  89     }
  90
  91     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const
  92     {
  93         return fCMAPMapper->unicodeToGlyph(ch);
  94     }
  95
  96     virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;
  97
  98     virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;
  99
 100     float getXPixelsPerEm() const
 101     {
 102         return fPointSize;
 103     };
 104
 105     float getYPixelsPerEm() const
 106     {
 107         return fPointSize;
 108     };
 109
 110     float getScaleFactorX() const
 111     {
 112         return 1.0;
 113     }
 114
 115     float getScaleFactorY() const
 116     {
 117         return 1.0;
 118     }
 119
 120 };
 121
 122 #endif