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 "GlyphPositioningTables.h"

    11 #include "PairPositioningSubtables.h"

    12 #include "ValueRecords.h"

    13 #include "GlyphIterator.h"

    14 #include "OpenTypeUtilities.h"

    15 #include "LESwaps.h"

    16 

    17 U_NAMESPACE_BEGIN

    18 

    19 le_uint32 PairPositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const

    20 {

    21     switch(SWAPW(subtableFormat))

    22     {

    23     case 0:

    24         return 0;

    25 

    26     case 1:

    27     {

    28         const PairPositioningFormat1Subtable *subtable = (const PairPositioningFormat1Subtable *) this;

    29 

    30         return subtable->process(glyphIterator, fontInstance);

    31     }

    32 

    33     case 2:

    34     {

    35         const PairPositioningFormat2Subtable *subtable = (const PairPositioningFormat2Subtable *) this;

    36 

    37         return subtable->process(glyphIterator, fontInstance);

    38     }

    39 

    40     default:

    41         return 0;

    42     }

    43 }

    44 

    45 le_uint32 PairPositioningFormat1Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const

    46 {

    47     LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();

    48     le_int32 coverageIndex = getGlyphCoverage(firstGlyph);

    49     GlyphIterator tempIterator(*glyphIterator);

    50 

    51     if (coverageIndex >= 0 && glyphIterator->next()) {

    52         Offset pairSetTableOffset = SWAPW(pairSetTableOffsetArray[coverageIndex]);

    53         PairSetTable *pairSetTable = (PairSetTable *) ((char *) this + pairSetTableOffset);

    54         le_uint16 pairValueCount = SWAPW(pairSetTable->pairValueCount);

    55         le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));

    56         le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));

    57         le_int16 recordSize = sizeof(PairValueRecord) - sizeof(ValueRecord) + valueRecord1Size + valueRecord2Size;

    58         LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();

    59         const PairValueRecord *pairValueRecord = NULL;

    60 

    61         if (pairValueCount != 0) {

    62             pairValueRecord = findPairValueRecord((TTGlyphID) LE_GET_GLYPH(secondGlyph), pairSetTable->pairValueRecordArray, pairValueCount, recordSize);

    63         }

    64 

    65         if (pairValueRecord == NULL) {

    66             return 0;

    67         }

    68 

    69         if (valueFormat1 != 0) {

    70             pairValueRecord->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);

    71         }

    72 

    73         if (valueFormat2 != 0) {

    74             const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &pairValueRecord->valueRecord1 + valueRecord1Size);

    75 

    76             valueRecord2->adjustPosition(SWAPW(valueFormat2), (char *) this, *glyphIterator, fontInstance);

    77         }

    78 

    79         return 2;

    80     }

    81 

    82     return 0;

    83 }

    84 

    85 le_uint32 PairPositioningFormat2Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const

    86 {

    87     LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();

    88     le_int32 coverageIndex = getGlyphCoverage(firstGlyph);

    89     GlyphIterator tempIterator(*glyphIterator);

    90 

    91     if (coverageIndex >= 0 && glyphIterator->next()) {

    92         LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();

    93         const ClassDefinitionTable *classDef1 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef1Offset));

    94         const ClassDefinitionTable *classDef2 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef2Offset));

    95         le_int32 class1 = classDef1->getGlyphClass(firstGlyph);

    96         le_int32 class2 = classDef2->getGlyphClass(secondGlyph);

    97         le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));

    98         le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));

    99         le_int16 class2RecordSize = valueRecord1Size + valueRecord2Size;

   100         le_int16 class1RecordSize = class2RecordSize * SWAPW(class2Count);

   101         const Class1Record *class1Record = (const Class1Record *) ((char *) class1RecordArray + (class1RecordSize * class1));

   102         const Class2Record *class2Record = (const Class2Record *) ((char *) class1Record->class2RecordArray + (class2RecordSize * class2));

   103 

   104 

   105         if (valueFormat1 != 0) {

   106             class2Record->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);

   107         }

   108 

   109         if (valueFormat2 != 0) {

   110             const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &class2Record->valueRecord1 + valueRecord1Size);

   111 

   112             valueRecord2->adjustPosition(SWAPW(valueFormat2), (const char *) this, *glyphIterator, fontInstance);

   113         }

   114 

   115         return 2;

   116     }

   117 

   118     return 0;

   119 }

   120 

   121 const PairValueRecord *PairPositioningFormat1Subtable::findPairValueRecord(TTGlyphID glyphID, const PairValueRecord *records, le_uint16 recordCount, le_uint16 recordSize) const

   122 {

   123     le_uint8 bit = OpenTypeUtilities::highBit(recordCount);

   124     le_uint16 power = 1 << bit;

   125     le_uint16 extra = (recordCount - power) * recordSize;

   126     le_uint16 probe = power * recordSize;

   127     const PairValueRecord *record = records;

   128     const PairValueRecord *trial = (const PairValueRecord *) ((char *) record + extra);

   129 

   130     if (SWAPW(trial->secondGlyph) <= glyphID) {

   131         record = trial;

   132     }

   133 

   134     while (probe > recordSize) {

   135         probe >>= 1;

   136         trial = (const PairValueRecord *) ((char *) record + probe);

   137 

   138         if (SWAPW(trial->secondGlyph) <= glyphID) {

   139             record = trial;

   140         }

   141     }

   142 

   143     if (SWAPW(record->secondGlyph) == glyphID) {

   144         return record;

   145     }

   146 

   147     return NULL;

   148 }

   149 

   150 U_NAMESPACE_END