1 /*

     2  *

     3  * (C) Copyright IBM Corp. 1998-2004 - 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 

    18 U_NAMESPACE_BEGIN

    19 

    20 LEGlyphID MarkToMarkPositioningSubtable::findMark2Glyph(GlyphIterator *glyphIterator) const

    21 {

    22     if (glyphIterator->findMark2Glyph()) {

    23         return glyphIterator->getCurrGlyphID();

    24     }

    25 

    26     return 0xFFFF;

    27 }

    28 

    29 le_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     anchorTable->getAnchor(mark2Glyph, fontInstance, mark2Anchor);

    69 

    70     fontInstance->getGlyphAdvance(markGlyph, pixels);

    71     fontInstance->pixelsToUnits(pixels, markAdvance);

    72 

    73     float anchorDiffX = mark2Anchor.fX - markAnchor.fX;

    74     float anchorDiffY = mark2Anchor.fY - markAnchor.fY;

    75 

    76     glyphIterator->setCurrGlyphBaseOffset(mark2Iterator.getCurrStreamPosition());

    77 

    78     if (glyphIterator->isRightToLeft()) {

    79         glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);

    80     } else {

    81         LEPoint mark2Advance;

    82 

    83         fontInstance->getGlyphAdvance(mark2Glyph, pixels);

    84         fontInstance->pixelsToUnits(pixels, mark2Advance);

    85 

    86         glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - mark2Advance.fX, anchorDiffY - mark2Advance.fY, -markAdvance.fX, -markAdvance.fY);

    87     }

    88 

    89     return 1;

    90 }

    91 

    92 U_NAMESPACE_END