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
30class PortableFontInstance : public LEFontInstance, protected FontTableCache
31{
32private:
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
67protected:
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
71public:
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
123