1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/textandloc/fontservices/textshaperplugin/IcuSource/layout/MarkToBasePosnSubtables.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,99 @@
     1.4 +/*
     1.5 + *
     1.6 + * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
     1.7 + *
     1.8 + */
     1.9 +
    1.10 +#include "LETypes.h"
    1.11 +#include "LEFontInstance.h"
    1.12 +#include "OpenTypeTables.h"
    1.13 +#include "AnchorTables.h"
    1.14 +#include "MarkArrays.h"
    1.15 +#include "GlyphPositioningTables.h"
    1.16 +#include "AttachmentPosnSubtables.h"
    1.17 +#include "MarkToBasePosnSubtables.h"
    1.18 +#include "GlyphIterator.h"
    1.19 +#include "LESwaps.h"
    1.20 +
    1.21 +U_NAMESPACE_BEGIN
    1.22 +
    1.23 +LEGlyphID MarkToBasePositioningSubtable::findBaseGlyph(GlyphIterator *glyphIterator) const
    1.24 +{
    1.25 +    if (glyphIterator->prev()) {
    1.26 +        return glyphIterator->getCurrGlyphID();
    1.27 +    }
    1.28 +
    1.29 +    return 0xFFFF;
    1.30 +}
    1.31 +
    1.32 +le_int32 MarkToBasePositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
    1.33 +{
    1.34 +    LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
    1.35 +    le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
    1.36 +
    1.37 +    if (markCoverage < 0) {
    1.38 +        // markGlyph isn't a covered mark glyph
    1.39 +        return 0;
    1.40 +    }
    1.41 +
    1.42 +    LEPoint markAnchor;
    1.43 +    const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset));
    1.44 +    le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor);
    1.45 +    le_uint16 mcCount = SWAPW(classCount);
    1.46 +
    1.47 +    if (markClass < 0 || markClass >= mcCount) {
    1.48 +        // markGlyph isn't in the mark array or its
    1.49 +        // mark class is too big. The table is mal-formed!
    1.50 +        return 0;
    1.51 +    }
    1.52 +
    1.53 +    // FIXME: We probably don't want to find a base glyph before a previous ligature... 
    1.54 +    GlyphIterator baseIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks /*| lfIgnoreLigatures*/));
    1.55 +    LEGlyphID baseGlyph = findBaseGlyph(&baseIterator);
    1.56 +    le_int32 baseCoverage = getBaseCoverage((LEGlyphID) baseGlyph);
    1.57 +    const BaseArray *baseArray = (const BaseArray *) ((char *) this + SWAPW(baseArrayOffset));
    1.58 +    le_uint16 baseCount = SWAPW(baseArray->baseRecordCount);
    1.59 +
    1.60 +    if (baseCoverage < 0 || baseCoverage >= baseCount) {
    1.61 +        // The base glyph isn't covered, or the coverage
    1.62 +        // index is too big. The latter means that the
    1.63 +        // table is mal-formed...
    1.64 +        return 0;
    1.65 +    }
    1.66 +
    1.67 +    const BaseRecord *baseRecord = &baseArray->baseRecordArray[baseCoverage * mcCount];
    1.68 +    Offset anchorTableOffset = SWAPW(baseRecord->baseAnchorTableOffsetArray[markClass]);
    1.69 +    const AnchorTable *anchorTable = (const AnchorTable *) ((char *) baseArray + anchorTableOffset);
    1.70 +    LEPoint baseAnchor, markAdvance, pixels;
    1.71 +
    1.72 +    if (anchorTableOffset == 0) {
    1.73 +        // this means the table is mal-formed...
    1.74 +        glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
    1.75 +        return 0;
    1.76 +    }
    1.77 +
    1.78 +    anchorTable->getAnchor(baseGlyph, fontInstance, baseAnchor);
    1.79 +
    1.80 +    fontInstance->getGlyphAdvance(markGlyph, pixels);
    1.81 +    fontInstance->pixelsToUnits(pixels, markAdvance);
    1.82 +
    1.83 +    float anchorDiffX = baseAnchor.fX - markAnchor.fX;
    1.84 +    float anchorDiffY = baseAnchor.fY - markAnchor.fY;
    1.85 +
    1.86 +    glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
    1.87 +
    1.88 +    if (glyphIterator->isRightToLeft()) {
    1.89 +        glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
    1.90 +    } else {
    1.91 +        LEPoint baseAdvance;
    1.92 +
    1.93 +        fontInstance->getGlyphAdvance(baseGlyph, pixels);
    1.94 +        fontInstance->pixelsToUnits(pixels, baseAdvance);
    1.95 +
    1.96 +        glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - baseAdvance.fX, anchorDiffY - baseAdvance.fY, -markAdvance.fX, -markAdvance.fY);
    1.97 +    }
    1.98 +
    1.99 +    return 1;
   1.100 +}
   1.101 +
   1.102 +U_NAMESPACE_END