146 lines
5.0 KiB
C++
146 lines
5.0 KiB
C++
/*
|
|
*
|
|
* (C) Copyright IBM Corp and Others. 1998-2014 - All Rights Reserved
|
|
*
|
|
*/
|
|
|
|
#include "LETypes.h"
|
|
#include "MorphTables.h"
|
|
#include "StateTables.h"
|
|
#include "MorphStateTables.h"
|
|
#include "SubtableProcessor2.h"
|
|
#include "StateTableProcessor2.h"
|
|
#include "LigatureSubstProc2.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(LigatureSubstitutionProcessor2)
|
|
|
|
LigatureSubstitutionProcessor2::LigatureSubstitutionProcessor2(const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
|
|
: StateTableProcessor2(morphSubtableHeader, success),
|
|
ligActionOffset(0),
|
|
componentOffset(0), ligatureOffset(0), entryTable(), ligatureSubstitutionHeader(morphSubtableHeader, success)
|
|
{
|
|
if (LE_FAILURE(success)) return;
|
|
|
|
ligActionOffset = SWAPL(ligatureSubstitutionHeader->ligActionOffset);
|
|
componentOffset = SWAPL(ligatureSubstitutionHeader->componentOffset);
|
|
ligatureOffset = SWAPL(ligatureSubstitutionHeader->ligatureOffset);
|
|
|
|
entryTable = LEReferenceToArrayOf<LigatureSubstitutionStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
|
|
}
|
|
|
|
LigatureSubstitutionProcessor2::~LigatureSubstitutionProcessor2()
|
|
{
|
|
}
|
|
|
|
void LigatureSubstitutionProcessor2::beginStateTable()
|
|
{
|
|
m = -1;
|
|
}
|
|
|
|
le_uint16 LigatureSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex2 index, LEErrorCode &success)
|
|
{
|
|
const LigatureSubstitutionStateEntry2 *entry = entryTable.getAlias(index, success);
|
|
if(LE_FAILURE(success)) return 0;
|
|
|
|
le_uint16 nextStateIndex = SWAPW(entry->nextStateIndex);
|
|
le_uint16 flags = SWAPW(entry->entryFlags);
|
|
le_uint16 ligActionIndex = SWAPW(entry->ligActionIndex);
|
|
|
|
if (flags & lsfSetComponent) {
|
|
if (++m >= nComponents) {
|
|
m = 0;
|
|
}
|
|
componentStack[m] = currGlyph;
|
|
} else if ( m == -1) {
|
|
// bad font- skip this glyph.
|
|
//LE_DEBUG_BAD_FONT("m==-1 (componentCount went negative)")
|
|
currGlyph+= dir;
|
|
return nextStateIndex;
|
|
}
|
|
|
|
ByteOffset actionOffset = flags & lsfPerformAction;
|
|
|
|
if (actionOffset != 0) {
|
|
LEReferenceTo<LigatureActionEntry> ap(stHeader, success, ligActionOffset); // byte offset
|
|
ap.addObject(ligActionIndex - 1, success); // index offset ( one before the actual start, because we will pre-increment)
|
|
LEReferenceToArrayOf<TTGlyphID> ligatureTable(stHeader, success, ligatureOffset, LE_UNBOUNDED_ARRAY);
|
|
LigatureActionEntry action;
|
|
le_int32 offset, i = 0;
|
|
le_int32 stack[nComponents];
|
|
le_int16 mm = -1;
|
|
|
|
LEReferenceToArrayOf<le_uint16> componentTable(stHeader, success, componentOffset, LE_UNBOUNDED_ARRAY);
|
|
if(LE_FAILURE(success)) {
|
|
currGlyph+= dir;
|
|
return nextStateIndex; // get out! bad font
|
|
}
|
|
|
|
do {
|
|
le_int32 componentGlyph = componentStack[m--]; // pop off
|
|
|
|
ap.addObject(success);
|
|
action = SWAPL(*ap.getAlias());
|
|
|
|
if (m < 0) {
|
|
m = nComponents - 1;
|
|
}
|
|
|
|
offset = action & lafComponentOffsetMask;
|
|
if (offset != 0) {
|
|
if(componentGlyph > glyphStorage.getGlyphCount() || componentGlyph < 0) {
|
|
LE_DEBUG_BAD_FONT("preposterous componentGlyph");
|
|
currGlyph+= dir;
|
|
return nextStateIndex; // get out! bad font
|
|
}
|
|
i += SWAPW(componentTable(LE_GET_GLYPH(glyphStorage[componentGlyph]) + (SignExtend(offset, lafComponentOffsetMask)),success));
|
|
|
|
if (action & (lafLast | lafStore)) {
|
|
TTGlyphID ligatureGlyph = SWAPW(ligatureTable(i,success));
|
|
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)) {
|
|
currGlyph += dir;
|
|
}
|
|
|
|
return nextStateIndex;
|
|
}
|
|
|
|
void LigatureSubstitutionProcessor2::endStateTable()
|
|
{
|
|
}
|
|
|
|
U_NAMESPACE_END
|