1/*
2 *
3 * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
4 *
5 */
6
7#include "LETypes.h"
8#include "LEFontInstance.h"
9#include "OpenTypeTables.h"
10#include "AnchorTables.h"
11#include "MarkArrays.h"
12#include "GlyphPositioningTables.h"
13#include "AttachmentPosnSubtables.h"
14#include "MarkToMarkPosnSubtables.h"
15#include "GlyphIterator.h"
16#include "LESwaps.h"
17
18U_NAMESPACE_BEGIN
19
20LEGlyphID MarkToMarkPositioningSubtable::findMark2Glyph(GlyphIterator *glyphIterator) const
21{
22    if (glyphIterator->findMark2Glyph()) {
23        return glyphIterator->getCurrGlyphID();
24    }
25
26    return 0xFFFF;
27}
28
29le_int32 MarkToMarkPositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
30{
31    LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
32    le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
33
34    if (markCoverage < 0) {
35        // markGlyph isn't a covered mark glyph
36        return 0;
37    }
38
39    LEPoint markAnchor;
40    const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset));
41    le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor);
42    le_uint16 mcCount = SWAPW(classCount);
43
44    if (markClass < 0 || markClass >= mcCount) {
45        // markGlyph isn't in the mark array or its
46        // mark class is too big. The table is mal-formed!
47        return 0;
48    }
49
50    GlyphIterator mark2Iterator(*glyphIterator);
51    LEGlyphID mark2Glyph = findMark2Glyph(&mark2Iterator);
52    le_int32 mark2Coverage = getBaseCoverage((LEGlyphID) mark2Glyph);
53    const Mark2Array *mark2Array = (const Mark2Array *) ((char *) this + SWAPW(baseArrayOffset));
54    le_uint16 mark2Count = SWAPW(mark2Array->mark2RecordCount);
55
56    if (mark2Coverage < 0 || mark2Coverage >= mark2Count) {
57        // The mark2 glyph isn't covered, or the coverage
58        // index is too big. The latter means that the
59        // table is mal-formed...
60        return 0;
61    }
62
63    const Mark2Record *mark2Record = &mark2Array->mark2RecordArray[mark2Coverage * mcCount];
64    Offset anchorTableOffset = SWAPW(mark2Record->mark2AnchorTableOffsetArray[markClass]);
65    const AnchorTable *anchorTable = (const AnchorTable *) ((char *) mark2Array + anchorTableOffset);
66    LEPoint mark2Anchor, markAdvance, pixels;
67
68    if (anchorTableOffset == 0) {
69        // this seems to mean that the marks don't attach...
70        return 0;
71    }
72
73    anchorTable->getAnchor(mark2Glyph, fontInstance, mark2Anchor);
74
75    fontInstance->getGlyphAdvance(markGlyph, pixels);
76    fontInstance->pixelsToUnits(pixels, markAdvance);
77
78    float anchorDiffX = mark2Anchor.fX - markAnchor.fX;
79    float anchorDiffY = mark2Anchor.fY - markAnchor.fY;
80
81    glyphIterator->setCurrGlyphBaseOffset(mark2Iterator.getCurrStreamPosition());
82
83    if (glyphIterator->isRightToLeft()) {
84        glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
85    } else {
86        LEPoint mark2Advance;
87
88        fontInstance->getGlyphAdvance(mark2Glyph, pixels);
89        fontInstance->pixelsToUnits(pixels, mark2Advance);
90
91        glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - mark2Advance.fX, anchorDiffY - mark2Advance.fY, -markAdvance.fX, -markAdvance.fY);
92    }
93
94    return 1;
95}
96
97U_NAMESPACE_END
98