| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 3 | * |
| 4 | * This code is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License version 2 only, as |
| 6 | * published by the Free Software Foundation. Sun designates this |
| 7 | * particular file as subject to the "Classpath" exception as provided |
| 8 | * by Sun in the LICENSE file that accompanied this code. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 22 | * have any questions. |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * |
| 28 | * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved |
| 29 | * |
| 30 | */ |
| 31 | |
| 32 | #include "LETypes.h" |
| 33 | #include "OpenTypeTables.h" |
| 34 | #include "OpenTypeUtilities.h" |
| 35 | #include "CoverageTables.h" |
| 36 | #include "LESwaps.h" |
| 37 | |
| 38 | le_int32 CoverageTable::getGlyphCoverage(LEGlyphID glyphID) const |
| 39 | { |
| 40 | switch(SWAPW(coverageFormat)) |
| 41 | { |
| 42 | case 0: |
| 43 | return -1; |
| 44 | |
| 45 | case 1: |
| 46 | { |
| 47 | const CoverageFormat1Table *f1Table = (const CoverageFormat1Table *) this; |
| 48 | |
| 49 | return f1Table->getGlyphCoverage(glyphID); |
| 50 | } |
| 51 | |
| 52 | case 2: |
| 53 | { |
| 54 | const CoverageFormat2Table *f2Table = (const CoverageFormat2Table *) this; |
| 55 | |
| 56 | return f2Table->getGlyphCoverage(glyphID); |
| 57 | } |
| 58 | |
| 59 | default: |
| 60 | return -1; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | le_int32 CoverageFormat1Table::getGlyphCoverage(LEGlyphID glyphID) const |
| 65 | { |
| 66 | TTGlyphID ttGlyphID = (TTGlyphID) LE_GET_GLYPH(glyphID); |
| 67 | le_uint16 count = SWAPW(glyphCount); |
| 68 | le_uint8 bit = OpenTypeUtilities::highBit(count); |
| 69 | le_uint16 power = 1 << bit; |
| 70 | le_uint16 extra = count - power; |
| 71 | le_uint16 probe = power; |
| 72 | le_uint16 index = 0; |
| 73 | |
| 74 | if (SWAPW(glyphArray[extra]) <= ttGlyphID) { |
| 75 | index = extra; |
| 76 | } |
| 77 | |
| 78 | while (probe > (1 << 0)) { |
| 79 | probe >>= 1; |
| 80 | |
| 81 | if (SWAPW(glyphArray[index + probe]) <= ttGlyphID) { |
| 82 | index += probe; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | if (SWAPW(glyphArray[index]) == ttGlyphID) { |
| 87 | return index; |
| 88 | } |
| 89 | |
| 90 | return -1; |
| 91 | } |
| 92 | |
| 93 | le_int32 CoverageFormat2Table::getGlyphCoverage(LEGlyphID glyphID) const |
| 94 | { |
| 95 | TTGlyphID ttGlyphID = (TTGlyphID) LE_GET_GLYPH(glyphID); |
| 96 | le_uint16 count = SWAPW(rangeCount); |
| 97 | le_int32 rangeIndex = |
| 98 | OpenTypeUtilities::getGlyphRangeIndex(ttGlyphID, rangeRecordArray, count); |
| 99 | |
| 100 | if (rangeIndex < 0) { |
| 101 | return -1; |
| 102 | } |
| 103 | |
| 104 | TTGlyphID firstInRange = SWAPW(rangeRecordArray[rangeIndex].firstGlyph); |
| 105 | le_uint16 startCoverageIndex = SWAPW(rangeRecordArray[rangeIndex].rangeValue); |
| 106 | |
| 107 | return startCoverageIndex + (ttGlyphID - firstInRange); |
| 108 | } |