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1 /*
2 *
3 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
4 *
5 */
6
7 #include "LETypes.h"
8 #include "MorphTables.h"
9 #include "StateTables.h"
10 #include "MorphStateTables.h"
11 #include "SubtableProcessor.h"
12 #include "StateTableProcessor.h"
13 #include "ContextualGlyphSubstProc.h"
14 #include "LEGlyphStorage.h"
15 #include "LESwaps.h"
16
17 U_NAMESPACE_BEGIN
18
19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor)
20
21 ContextualGlyphSubstitutionProcessor::ContextualGlyphSubstitutionProcessor(const LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success)
22 : StateTableProcessor(morphSubtableHeader, success), entryTable(), contextualGlyphSubstitutionHeader(morphSubtableHeader, success)
23 {
24 contextualGlyphSubstitutionHeader.orphan();
25 substitutionTableOffset = SWAPW(contextualGlyphSubstitutionHeader->substitutionTableOffset);
26
27
28 entryTable = LEReferenceToArrayOf<ContextualGlyphSubstitutionStateEntry>(stateTableHeader, success,
29 (const ContextualGlyphSubstitutionStateEntry*)(&stateTableHeader->stHeader),
30 entryTableOffset, LE_UNBOUNDED_ARRAY);
31 int16Table = LEReferenceToArrayOf<le_int16>(stateTableHeader, success, (const le_int16*)(&stateTableHeader->stHeader),
32 0, LE_UNBOUNDED_ARRAY); // rest of the table as le_int16s
33 }
34
35 ContextualGlyphSubstitutionProcessor::~ContextualGlyphSubstitutionProcessor()
36 {
37 }
38
39 void ContextualGlyphSubstitutionProcessor::beginStateTable()
40 {
41 markGlyph = 0;
42 }
43
44 ByteOffset ContextualGlyphSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
45 {
46 LEErrorCode success = LE_NO_ERROR;
47 const ContextualGlyphSubstitutionStateEntry *entry = entryTable.getAlias(index, success);
48 ByteOffset newState = SWAPW(entry->newStateOffset);
49 le_int16 flags = SWAPW(entry->flags);
50 WordOffset markOffset = SWAPW(entry->markOffset);
51 WordOffset currOffset = SWAPW(entry->currOffset);
52
53 if (markOffset != 0 && LE_SUCCESS(success)) {
54 LEGlyphID mGlyph = glyphStorage[markGlyph];
55 TTGlyphID newGlyph = SWAPW(int16Table.getObject(markOffset + LE_GET_GLYPH(mGlyph), success)); // whew.
56
57 glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);
58 }
59
60 if (currOffset != 0) {
61 LEGlyphID thisGlyph = glyphStorage[currGlyph];
62 TTGlyphID newGlyph = SWAPW(int16Table.getObject(currOffset + LE_GET_GLYPH(thisGlyph), success)); // whew.
63
64 glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph);
65 }
66
67 if (flags & cgsSetMark) {
68 markGlyph = currGlyph;
69 }
70
71 if (!(flags & cgsDontAdvance)) {
72 // should handle reverse too!
73 currGlyph += 1;
74 }
75
76 return newState;
77 }
78
79 void ContextualGlyphSubstitutionProcessor::endStateTable()
80 {
81 }
82
83 U_NAMESPACE_END