PortableFontInstance.h revision af169d2813ff8075288cd4a7811f0715e4fea3da 
1
2/*
3 *******************************************************************************
4 *
5 *   Copyright (C) 1999-2008, 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#define HB_H_IN
19#include <hb-font.h>
20#include <hb-blob.h>
21
22#include "layout/LETypes.h"
23#include "layout/LEFontInstance.h"
24
25#include "FontTableCache.h"
26
27#include "cmaps.h"
28
29class PortableFontInstance : public LEFontInstance, protected FontTableCache
30{
31private:
32    hb_face_t *fFace;
33
34    float     fXScale;
35    float     fYScale;
36    le_int32  fUnitsPerEM;
37    le_int32  fAscent;
38    le_int32  fDescent;
39    le_int32  fLeading;
40
41    float fDeviceScaleX;
42    float fDeviceScaleY;
43
44    const NAMETable *fNAMETable;
45    le_uint16 fNameCount;
46    le_uint16 fNameStringOffset;
47
48    CMAPMapper *fCMAPMapper;
49
50    const HMTXTable *fHMTXTable;
51    le_uint16 fNumGlyphs;
52    le_uint16 fNumLongHorMetrics;
53
54    static le_int8 highBit(le_int32 value);
55
56    void getMetrics();
57
58    CMAPMapper *findUnicodeMapper();
59
60protected:
61    hb_blob_t *readFontTable(LETag tableTag) const;
62
63public:
64    PortableFontInstance(hb_face_t *face, float xScale, float yScale, LEErrorCode &status);
65
66    virtual ~PortableFontInstance();
67
68    virtual const void *getFontTable(LETag tableTag) const;
69
70    virtual const char *getNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
71
72    virtual const LEUnicode16 *getUnicodeNameString(le_uint16 nameID, le_uint16 platform, le_uint16 encoding, le_uint16 language) const;
73
74    virtual void deleteNameString(const char *name) const;
75
76    virtual void deleteNameString(const LEUnicode16 *name) const;
77
78    virtual le_int32 getUnitsPerEM() const;
79
80    virtual le_uint32 getFontChecksum() const;
81
82    virtual le_int32 getAscent() const;
83
84    virtual le_int32 getDescent() const;
85
86    virtual le_int32 getLeading() const;
87
88    // We really want to inherit this method from the superclass, but some compilers
89    // issue a warning if we don't implement it...
90    virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const;
91
92    // We really want to inherit this method from the superclass, but some compilers
93    // issue a warning if we don't implement it...
94    virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const;
95
96    virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const;
97
98    virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;
99
100    virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;
101
102    virtual float getXPixelsPerEm() const;
103
104    virtual float getYPixelsPerEm() const;
105
106    virtual float getScaleFactorX() const;
107
108    virtual float getScaleFactorY() const;
109
110};
111
112#endif
113