icuSources/test/letest/PortableFontInstance.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3
   4 /*
   5  *******************************************************************************
   6  *
   7  *   Copyright (C) 1999-2015, International Business Machines
   8  *   Corporation and others.  All Rights Reserved.
   9  *
  10  *******************************************************************************
  11  *   file name:  PortableFontInstance.h
  12  *
  13  *   created on: 11/12/1999
  14  *   created by: Eric R. Mader
  15  */
  16
  17 #ifndef __PORTABLEFONTINSTANCE_H
  18 #define __PORTABLEFONTINSTANCE_H
  19
  20 #include <stdio.h>
  21
  22 #include "layout/LETypes.h"
  23 #include "layout/LEFontInstance.h"
  24
  25 #include "FontTableCache.h"
  26
  27 #include "sfnt.h"
  28 #include "cmaps.h"
  29
  30 class PortableFontInstance : public LEFontInstance, protected FontTableCache
  31 {
  32 private:
  33     FILE *fFile;
  34
  35     float     fPointSize;
  36     le_int32  fUnitsPerEM;
  37     le_uint32 fFontChecksum;
  38     le_int32  fAscent;
  39     le_int32  fDescent;
  40     le_int32  fLeading;
  41
  42     const SFNTDirectory *fDirectory;
  43     le_uint16 fDirPower;
  44     le_uint16 fDirExtra;
  45
  46     float fDeviceScaleX;
  47     float fDeviceScaleY;
  48
  49     const NAMETable *fNAMETable;
  50     le_uint16 fNameCount;
  51     le_uint16 fNameStringOffset;
  52
  53     CMAPMapper *fCMAPMapper;
  54
  55     const HMTXTable *fHMTXTable;
  56     le_uint16 fNumGlyphs;
  57     le_uint16 fNumLongHorMetrics;
  58
  59     static le_int8 highBit(le_int32 value);
  60
  61     const DirectoryEntry *findTable(LETag tag) const;
  62     const void *readTable(LETag tag, le_uint32 *length) const;
  63     void getMetrics();
  64
  65     CMAPMapper *findUnicodeMapper();
  66
  67 protected:
  68     const void *readFontTable(LETag tableTag) const { size_t ignored; return readFontTable(tableTag, ignored); }
  69     const void *readFontTable(LETag tableTag, size_t &length) const;
  70
  71 public:
  72     PortableFontInstance(const char *fileName, float pointSize, LEErrorCode &status);
  73
  74     virtual ~PortableFontInstance();
  75
  76     virtual const void *getFontTable(LETag tableTag, size_t &length) const;
  77
  78     virtual const char *getNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
  79
  80     virtual const LEUnicode16 *getUnicodeNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
  81
  82     virtual void deleteNameString(const char *name) const;
  83
  84     virtual void deleteNameString(const LEUnicode16 *name) const;
  85
  86     virtual le_int32 getUnitsPerEM() const;
  87
  88     virtual le_uint32 getFontChecksum() const;
  89
  90     virtual le_uint32 getRawChecksum() const;
  91
  92     virtual le_int32 getAscent() const;
  93
  94     virtual le_int32 getDescent() const;
  95
  96     virtual le_int32 getLeading() const;
  97
  98     // We really want to inherit this method from the superclass, but some compilers
  99     // issue a warning if we don't implement it...
 100     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const;
 101
 102     // We really want to inherit this method from the superclass, but some compilers
 103     // issue a warning if we don't implement it...
 104     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const;
 105
 106     virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const;
 107
 108     virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;
 109
 110     virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;
 111
 112     float getXPixelsPerEm() const;
 113
 114     float getYPixelsPerEm() const;
 115
 116     float getScaleFactorX() const;
 117
 118     float getScaleFactorY() const;
 119
 120 };
 121
 122 #endif