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:
readFontTable(LETag tableTag)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
121