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 > 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--];
}
}
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
if (LE_FAILURE(success)) {
currGlyph+= dir;
return nextStateIndex;
}
ap.addObject(ligActionIndex, success);
LEReferenceToArrayOf<TTGlyphID> ligatureTable(stHeader, success, ligatureOffset, LE_UNBOUNDED_ARRAY);
LigatureActionEntry action;
le_int32 offset, i = 0, j = 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_uint32 componentGlyph = componentStack[m--]; // pop off
if (j++ > 0) {
ap.addObject(success);
}
if (LE_FAILURE(success)) {
currGlyph+= dir;
return nextStateIndex;
}
action = SWAPL(*ap.getAlias());
if (m < 0) {
m = nComponents - 1;
}
offset = action & lafComponentOffsetMask;
if (offset != 0) {
if(componentGlyph >= glyphStorage.getGlyphCount()) {
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 (LE_FAILURE(success)) {
currGlyph+= dir;
return nextStateIndex;
}
if (action & (lafLast | lafStore)) {
TTGlyphID ligatureGlyph = SWAPW(ligatureTable(i,success));
if (LE_FAILURE(success)) {
currGlyph+= dir;
return nextStateIndex;
}
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 (LE_SUCCESS(success) && !(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--];
}
}
