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/*
*
* (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "MorphTables.h"
#include "StateTables.h"
#include "MorphStateTables.h"
#include "SubtableProcessor.h"
#include "StateTableProcessor.h"
#include "LigatureSubstProc.h"
#include "LEGlyphStorage.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
#define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))
#define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m))
#define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor)
LigatureSubstitutionProcessor::LigatureSubstitutionProcessor(const LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success)
: StateTableProcessor(morphSubtableHeader, success), ligatureSubstitutionHeader(morphSubtableHeader, success)
{
if(LE_FAILURE(success)) return;
ligatureActionTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureActionTableOffset);
componentTableOffset = SWAPW(ligatureSubstitutionHeader->componentTableOffset);
ligatureTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureTableOffset);
entryTable = LEReferenceToArrayOf<LigatureSubstitutionStateEntry>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
}
LigatureSubstitutionProcessor::~LigatureSubstitutionProcessor()
{
}
void LigatureSubstitutionProcessor::beginStateTable()
{
m = -1;
}
ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
{
LEErrorCode success = LE_NO_ERROR;
const LigatureSubstitutionStateEntry *entry = entryTable.getAlias(index, success);
ByteOffset newState = SWAPW(entry->newStateOffset);
le_int16 flags = SWAPW(entry->flags);
if (flags & lsfSetComponent) {
if (++m >= nComponents) {
m = 0;
}
componentStack[m] = currGlyph;
} else if ( m == -1) {
// bad font- skip this glyph.
currGlyph++;
return newState;
}
ByteOffset actionOffset = flags & lsfActionOffsetMask;
if (actionOffset != 0) {
LEReferenceTo<LigatureActionEntry> ap(stHeader, success, actionOffset);
LigatureActionEntry action;
le_int32 offset, i = 0;
le_int32 stack[nComponents];
le_int16 mm = -1;
do {
le_uint32 componentGlyph = componentStack[m--];
action = SWAPL(*ap.getAlias());
ap.addObject(success); // ap++
if (m < 0) {
m = nComponents - 1;
}
offset = action & lafComponentOffsetMask;
if (offset != 0) {
LEReferenceToArrayOf<le_int16> offsetTable(stHeader, success, 2 * SignExtend(offset, lafComponentOffsetMask), LE_UNBOUNDED_ARRAY);
if(LE_FAILURE(success)) {
currGlyph++;
LE_DEBUG_BAD_FONT("off end of ligature substitution header");
return newState; // get out! bad font
}
if(componentGlyph > (le_uint32)glyphStorage.getGlyphCount()) {
LE_DEBUG_BAD_FONT("preposterous componentGlyph");
currGlyph++;
return newState; // get out! bad font
}
i += SWAPW(offsetTable.getObject(LE_GET_GLYPH(glyphStorage[componentGlyph]), success));
if (action & (lafLast | lafStore)) {
LEReferenceTo<TTGlyphID> ligatureOffset(stHeader, success, i);
TTGlyphID ligatureGlyph = SWAPW(*ligatureOffset.getAlias());
glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph);
if(mm==nComponents) {
LE_DEBUG_BAD_FONT("exceeded nComponents");
mm--; // don't overrun the stack.
}
stack[++mm] = componentGlyph;
i = 0;
} else {
glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF);
}
}
#if LE_ASSERT_BAD_FONT
if(m<0) {
LE_DEBUG_BAD_FONT("m<0")
}
#endif
} while (!(action & lafLast) && (m>=0) ); // stop if last bit is set, or if run out of items
while (mm >= 0) {
if (++m >= nComponents) {
m = 0;
}
componentStack[m] = stack[mm--];
}
}
if (!(flags & lsfDontAdvance)) {
// should handle reverse too!
currGlyph += 1;
}
return newState;
}
void LigatureSubstitutionProcessor::endStateTable()
{
}
U_NAMESPACE_END
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