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
28class PortableFontInstance : public LEFontInstance, protected FontTableCache
29{
30private:
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
65protected:
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
69public:
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