MarkToBasePosnSubtables.cpp 5.5 KB
Newer Older
D
duke 已提交
1 2 3 4 5
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
6
 * published by the Free Software Foundation.  Oracle designates this
D
duke 已提交
7
 * particular file as subject to the "Classpath" exception as provided
8
 * by Oracle in the LICENSE file that accompanied this code.
D
duke 已提交
9 10 11 12 13 14 15 16 17 18 19
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
20 21 22
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
D
duke 已提交
23 24 25 26 27
 *
 */

/*
 *
S
srl 已提交
28
 * (C) Copyright IBM Corp. 1998-2010 - All Rights Reserved
D
duke 已提交
29 30 31 32 33 34 35 36 37 38 39 40 41 42
 *
 */

#include "LETypes.h"
#include "LEFontInstance.h"
#include "OpenTypeTables.h"
#include "AnchorTables.h"
#include "MarkArrays.h"
#include "GlyphPositioningTables.h"
#include "AttachmentPosnSubtables.h"
#include "MarkToBasePosnSubtables.h"
#include "GlyphIterator.h"
#include "LESwaps.h"

43 44
U_NAMESPACE_BEGIN

D
duke 已提交
45 46 47 48 49 50 51 52 53
LEGlyphID MarkToBasePositioningSubtable::findBaseGlyph(GlyphIterator *glyphIterator) const
{
    if (glyphIterator->prev()) {
        return glyphIterator->getCurrGlyphID();
    }

    return 0xFFFF;
}

P
prr 已提交
54
le_int32 MarkToBasePositioningSubtable::process(const LETableReference &base, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode &success) const
D
duke 已提交
55 56
{
    LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
P
prr 已提交
57
    le_int32 markCoverage = getGlyphCoverage(base, (LEGlyphID) markGlyph, success);
D
duke 已提交
58

59 60 61 62
    if (LE_FAILURE(success)) {
      return 0;
    }

D
duke 已提交
63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81
    if (markCoverage < 0) {
        // markGlyph isn't a covered mark glyph
        return 0;
    }

    LEPoint markAnchor;
    const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset));
    le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor);
    le_uint16 mcCount = SWAPW(classCount);

    if (markClass < 0 || markClass >= mcCount) {
        // markGlyph isn't in the mark array or its
        // mark class is too big. The table is mal-formed!
        return 0;
    }

    // FIXME: We probably don't want to find a base glyph before a previous ligature...
    GlyphIterator baseIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks /*| lfIgnoreLigatures*/));
    LEGlyphID baseGlyph = findBaseGlyph(&baseIterator);
P
prr 已提交
82
    le_int32 baseCoverage = getBaseCoverage(base, (LEGlyphID) baseGlyph, success);
D
duke 已提交
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
    const BaseArray *baseArray = (const BaseArray *) ((char *) this + SWAPW(baseArrayOffset));
    le_uint16 baseCount = SWAPW(baseArray->baseRecordCount);

    if (baseCoverage < 0 || baseCoverage >= baseCount) {
        // The base glyph isn't covered, or the coverage
        // index is too big. The latter means that the
        // table is mal-formed...
        return 0;
    }

    const BaseRecord *baseRecord = &baseArray->baseRecordArray[baseCoverage * mcCount];
    Offset anchorTableOffset = SWAPW(baseRecord->baseAnchorTableOffsetArray[markClass]);
    const AnchorTable *anchorTable = (const AnchorTable *) ((char *) baseArray + anchorTableOffset);
    LEPoint baseAnchor, markAdvance, pixels;

    if (anchorTableOffset == 0) {
        // this means the table is mal-formed...
        glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
        return 0;
    }

    anchorTable->getAnchor(baseGlyph, fontInstance, baseAnchor);

    fontInstance->getGlyphAdvance(markGlyph, pixels);
    fontInstance->pixelsToUnits(pixels, markAdvance);

    float anchorDiffX = baseAnchor.fX - markAnchor.fX;
    float anchorDiffY = baseAnchor.fY - markAnchor.fY;

    glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());

    if (glyphIterator->isRightToLeft()) {
S
srl 已提交
115 116
        // FIXME: need similar patch to below; also in MarkToLigature and MarkToMark
        // (is there a better way to approach this for all the cases?)
D
duke 已提交
117 118 119 120 121
        glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
    } else {
        LEPoint baseAdvance;

        fontInstance->getGlyphAdvance(baseGlyph, pixels);
S
srl 已提交
122 123 124 125 126 127 128 129 130 131 132 133 134 135

        //JK: adjustment needs to account for non-zero advance of any marks between base glyph and current mark
        GlyphIterator gi(baseIterator, (le_uint16)0); // copy of baseIterator that won't ignore marks
        gi.next(); // point beyond the base glyph
        while (gi.getCurrStreamPosition() < glyphIterator->getCurrStreamPosition()) { // for all intervening glyphs (marks)...
            LEGlyphID otherMark = gi.getCurrGlyphID();
            LEPoint px;
            fontInstance->getGlyphAdvance(otherMark, px); // get advance, in case it's non-zero
            pixels.fX += px.fX; // and add that to the base glyph's advance
            pixels.fY += px.fY;
            gi.next();
        }
        // end of JK patch

D
duke 已提交
136 137 138 139 140 141 142
        fontInstance->pixelsToUnits(pixels, baseAdvance);

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

    return 1;
}
143 144

U_NAMESPACE_END