icuSources/test/letest/PortableFontInstance.h

   1
   2 /*
   3  *******************************************************************************
   4  *
   5  *   Copyright (C) 1999-2015, 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_uint32 fFontChecksum;
  36     le_int32  fAscent;
  37     le_int32  fDescent;
  38     le_int32  fLeading;
  39
  40     const SFNTDirectory *fDirectory;
  41     le_uint16 fDirPower;
  42     le_uint16 fDirExtra;
  43
  44     float fDeviceScaleX;
  45     float fDeviceScaleY;
  46
  47     const NAMETable *fNAMETable;
  48     le_uint16 fNameCount;
  49     le_uint16 fNameStringOffset;
  50
  51     CMAPMapper *fCMAPMapper;
  52
  53     const HMTXTable *fHMTXTable;
  54     le_uint16 fNumGlyphs;
  55     le_uint16 fNumLongHorMetrics;
  56
  57     static le_int8 highBit(le_int32 value);
  58
  59     const DirectoryEntry *findTable(LETag tag) const;
  60     const void *readTable(LETag tag, le_uint32 *length) const;
  61     void getMetrics();
  62
  63     CMAPMapper *findUnicodeMapper();
  64
  65 protected:
  66     const void *readFontTable(LETag tableTag) const { size_t ignored; return readFontTable(tableTag, ignored); }
  67     const void *readFontTable(LETag tableTag, size_t &length) const;
  68
  69 public:
  70     PortableFontInstance(const char *fileName, float pointSize, LEErrorCode &status);
  71
  72     virtual ~PortableFontInstance();
  73
  74     virtual const void *getFontTable(LETag tableTag, size_t &length) const;
  75
  76     virtual const char *getNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
  77
  78     virtual const LEUnicode16 *getUnicodeNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
  79
  80     virtual void deleteNameString(const char *name) const;
  81
  82     virtual void deleteNameString(const LEUnicode16 *name) const;
  83
  84     virtual le_int32 getUnitsPerEM() const;
  85
  86     virtual le_uint32 getFontChecksum() const;
  87
  88     virtual le_uint32 getRawChecksum() const;
  89
  90     virtual le_int32 getAscent() const;
  91
  92     virtual le_int32 getDescent() const;
  93
  94     virtual le_int32 getLeading() const;
  95
  96     // We really want to inherit this method from the superclass, but some compilers
  97     // issue a warning if we don't implement it...
  98     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const;
  99
 100     // We really want to inherit this method from the superclass, but some compilers
 101     // issue a warning if we don't implement it...
 102     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const;
 103
 104     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const;
 105
 106     virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;
 107
 108     virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;
 109
 110     float getXPixelsPerEm() const;
 111
 112     float getYPixelsPerEm() const;
 113
 114     float getScaleFactorX() const;
 115
 116     float getScaleFactorY() const;
 117
 118 };
 119
 120 #endif