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[truetype] Updates for the forthcoming OpenType 1.9 standard (2/2). 

* src/truetype/ttgxvar.c (ft_var_load_item_variation_store):
s/shortDeltaCount/wordDeltaCount/ (as done in the specification, too).
Recognize new format and reject it for now.
This commit is contained in:
Werner Lemberg 2021-11-13 21:11:00 +01:00
parent 93e6b3e8e9
commit e4f7673e46
1 changed files with 41 additions and 24 deletions
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65
src/truetype/ttgxvar.c
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@ -457,7 +457,8 @@
FT_UShort format; FT_UShort format;
FT_ULong region_offset; FT_ULong region_offset;
FT_UInt i, j, k; FT_UInt i, j, k;
FT_UInt shortDeltaCount; FT_UInt wordDeltaCount;
FT_Bool long_words;
GX_Blend blend = face->blend; GX_Blend blend = face->blend;
GX_ItemVarData varData; GX_ItemVarData varData;
@ -572,15 +573,18 @@
goto Exit; goto Exit;
if ( FT_READ_USHORT( varData->itemCount ) || if ( FT_READ_USHORT( varData->itemCount ) ||
FT_READ_USHORT( shortDeltaCount ) || FT_READ_USHORT( wordDeltaCount ) ||
FT_READ_USHORT( varData->regionIdxCount ) ) FT_READ_USHORT( varData->regionIdxCount ) )
goto Exit; goto Exit;
long_words = !!( wordDeltaCount & 0x8000 );
wordDeltaCount &= 0x7FFF;
/* check some data consistency */ /* check some data consistency */
if ( shortDeltaCount > varData->regionIdxCount ) if ( wordDeltaCount > varData->regionIdxCount )
{ {
FT_TRACE2(( "bad short count %d or region count %d\n", FT_TRACE2(( "bad short count %d or region count %d\n",
shortDeltaCount, wordDeltaCount,
varData->regionIdxCount )); varData->regionIdxCount ));
error = FT_THROW( Invalid_Table ); error = FT_THROW( Invalid_Table );
goto Exit; goto Exit;
@ -616,39 +620,52 @@
/* Parse delta set. */ /* Parse delta set. */
/* */ /* */
/* On input, deltas are (shortDeltaCount + regionIdxCount) bytes */ /* On input, deltas are (wordDeltaCount + regionIdxCount) bytes */
/* each; on output, deltas are expanded to `regionIdxCount' shorts */ /* each if `long_words` isn't set, and twice as much otherwise. */
/* each. */ /* */
/* On output, deltas are expanded to `regionIdxCount` shorts each. */
if ( FT_NEW_ARRAY( varData->deltaSet, if ( FT_NEW_ARRAY( varData->deltaSet,
varData->regionIdxCount * varData->itemCount ) ) varData->regionIdxCount * varData->itemCount ) )
goto Exit; goto Exit;
/* the delta set is stored as a 2-dimensional array of shorts; */ /* the delta set is stored as a 2-dimensional array of shorts */
/* sign-extend signed bytes to signed shorts */ if ( long_words )
for ( j = 0; j < varData->itemCount * varData->regionIdxCount; )
{ {
for ( k = 0; k < shortDeltaCount; k++, j++ ) /* new in OpenType 1.9, currently for 'COLR' table only; */
/* the deltas are interpreted as 16.16 fixed-point scaling values */
/* not supported yet */
error = FT_THROW( Invalid_Table );
goto Exit;
}
else
{
for ( j = 0; j < varData->itemCount * varData->regionIdxCount; )
{ {
/* read the short deltas */ for ( k = 0; k < wordDeltaCount; k++, j++ )
FT_Short delta; {
/* read the short deltas */
FT_Short delta;
if ( FT_READ_SHORT( delta ) ) if ( FT_READ_SHORT( delta ) )
goto Exit; goto Exit;
varData->deltaSet[j] = delta; varData->deltaSet[j] = delta;
} }
for ( ; k < varData->regionIdxCount; k++, j++ ) for ( ; k < varData->regionIdxCount; k++, j++ )
{ {
/* read the (signed) byte deltas */ /* read the (signed) byte deltas */
FT_Char delta; FT_Char delta;
if ( FT_READ_CHAR( delta ) ) if ( FT_READ_CHAR( delta ) )
goto Exit; goto Exit;
varData->deltaSet[j] = delta; varData->deltaSet[j] = delta;
}
} }
} }
} }