1
2/*
3 *******************************************************************************
4 *
5 *   © 2016 and later: Unicode, Inc. and others.
6 *   License & terms of use: http://www.unicode.org/copyright.html#License
7 *
8 *******************************************************************************
9 *******************************************************************************
10 *
11 *   Copyright (C) 1999-2013, International Business Machines
12 *   Corporation and others.  All Rights Reserved.
13 *
14 *******************************************************************************
15 *   file name:  PortableFontInstance.h
16 *
17 *   created on: 11/12/1999
18 *   created by: Eric R. Mader
19 */
20
21#ifndef __PORTABLEFONTINSTANCE_H
22#define __PORTABLEFONTINSTANCE_H
23
24#include <stdio.h>
25
26#include "layout/LETypes.h"
27#include "layout/LEFontInstance.h"
28
29#include "FontTableCache.h"
30
31#include "sfnt.h"
32#include "cmaps.h"
33
34class PortableFontInstance : public LEFontInstance, protected FontTableCache
35{
36private:
37    FILE *fFile;
38
39    float     fPointSize;
40    le_int32  fUnitsPerEM;
41    le_uint32 fFontChecksum;
42    le_int32  fAscent;
43    le_int32  fDescent;
44    le_int32  fLeading;
45
46    const SFNTDirectory *fDirectory;
47    le_uint16 fDirPower;
48    le_uint16 fDirExtra;
49
50    float fDeviceScaleX;
51    float fDeviceScaleY;
52
53    const NAMETable *fNAMETable;
54    le_uint16 fNameCount;
55    le_uint16 fNameStringOffset;
56
57    CMAPMapper *fCMAPMapper;
58
59    const HMTXTable *fHMTXTable;
60    le_uint16 fNumGlyphs;
61    le_uint16 fNumLongHorMetrics;
62
63    static le_int8 highBit(le_int32 value);
64
65    const DirectoryEntry *findTable(LETag tag) const;
66    const void *readTable(LETag tag, le_uint32 *length) const;
67    void getMetrics();
68
69    CMAPMapper *findUnicodeMapper();
70
71protected:
72    const void *readFontTable(LETag tableTag) const { size_t ignored; return readFontTable(tableTag, ignored); }
73    const void *readFontTable(LETag tableTag, size_t &length) const;
74
75public:
76    PortableFontInstance(const char *fileName, float pointSize, LEErrorCode &status);
77
78    virtual ~PortableFontInstance();
79
80    virtual const void *getFontTable(LETag tableTag) const;
81    virtual const void *getFontTable(LETag tableTag, size_t &length) const;
82
83    virtual const char *getNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
84
85    virtual const LEUnicode16 *getUnicodeNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
86
87    virtual void deleteNameString(const char *name) const;
88
89    virtual void deleteNameString(const LEUnicode16 *name) const;
90
91    virtual le_int32 getUnitsPerEM() const;
92
93    virtual le_uint32 getFontChecksum() const;
94
95    virtual le_uint32 getRawChecksum() const;
96
97    virtual le_int32 getAscent() const;
98
99    virtual le_int32 getDescent() const;
100
101    virtual le_int32 getLeading() const;
102
103    // We really want to inherit this method from the superclass, but some compilers
104    // issue a warning if we don't implement it...
105    virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const;
106
107    // We really want to inherit this method from the superclass, but some compilers
108    // issue a warning if we don't implement it...
109    virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const;
110
111    virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const;
112
113    virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;
114
115    virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;
116
117    float getXPixelsPerEm() const;
118
119    float getYPixelsPerEm() const;
120
121    float getScaleFactorX() const;
122
123    float getScaleFactorY() const;
124
125};
126
127#endif
128