1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/*
* @(#)GlyphSubstLookupProc.cpp 1.6 00/03/15
*
* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "MorphTables.h"
#include "StateTables.h"
#include "MorphStateTables.h"
#include "SubtableProcessor.h"
#include "StateTableProcessor.h"
#include "LigatureSubstProc.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
#define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))
#define SignBit(m) ((ExtendedComplement(m) >> 1) & (m))
#define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))
LigatureSubstitutionProcessor::LigatureSubstitutionProcessor(const MorphSubtableHeader *morphSubtableHeader)
: StateTableProcessor(morphSubtableHeader)
{
ligatureSubstitutionHeader = (const LigatureSubstitutionHeader *) morphSubtableHeader;
ligatureActionTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureActionTableOffset);
componentTableOffset = SWAPW(ligatureSubstitutionHeader->componentTableOffset);
ligatureTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureTableOffset);
entryTable = (const LigatureSubstitutionStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);
}
LigatureSubstitutionProcessor::~LigatureSubstitutionProcessor()
{
}
void LigatureSubstitutionProcessor::beginStateTable()
{
m = -1;
}
ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphID *glyphs, le_int32 *charIndices, le_int32 &currGlyph, le_int32 glyphCount, EntryTableIndex index)
{
const LigatureSubstitutionStateEntry *entry = &entryTable[index];
ByteOffset newState = SWAPW(entry->newStateOffset);
le_int16 flags = SWAPW(entry->flags);
if (flags & lsfSetComponent) {
if (++m >= nComponents) {
m = 0;
}
componentStack[m] = currGlyph;
}
ByteOffset actionOffset = flags & lsfActionOffsetMask;
if (actionOffset != 0) {
const LigatureActionEntry *ap = (const LigatureActionEntry *) ((char *) &ligatureSubstitutionHeader->stHeader + actionOffset);
LigatureActionEntry action;
le_int32 offset, i = 0;
le_int32 stack[nComponents];
le_int16 mm = -1;
do {
le_uint32 componentGlyph = componentStack[m--];
action = SWAPL(*ap++);
if (m < 0) {
m = nComponents - 1;
}
offset = action & lafComponentOffsetMask;
if (offset != 0) {
const le_int16 *offsetTable = (const le_int16 *)((char *) &ligatureSubstitutionHeader->stHeader + 2 * SignExtend(offset, lafComponentOffsetMask));
i += SWAPW(offsetTable[glyphs[componentGlyph]]);
if (action & (lafLast | lafStore)) {
const le_int16 *ligatureOffset = (const le_int16 *) ((char *) &ligatureSubstitutionHeader->stHeader + i);
glyphs[componentGlyph] = SWAPW(*ligatureOffset);
stack[++mm] = componentGlyph;
i = 0;
} else {
glyphs[componentGlyph] = 0xFFFF;
}
}
} while (!(action & lafLast));
while (mm >= 0) {
if (++m >= nComponents) {
m = 0;
}
componentStack[m] = stack[mm--];
}
}
if (!(flags & lsfDontAdvance)) {
// should handle reverse too!
currGlyph += 1;
}
return newState;
}
void LigatureSubstitutionProcessor::endStateTable()
{
}
U_NAMESPACE_END
|
