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[truetype] Allow shared points in `cvar' table (#52532).

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* src/truetype/ttgxvar.c (tt_face_vary_cvt): Implement it by copying
and adjusting the corresponding code from
`TT_Vary_Apply_Glyph_Deltas'.
This commit is contained in:
Werner Lemberg 2017-12-04 12:36:07 +01:00
parent c18c391b68
commit 337e49cfe2
2 changed files with 58 additions and 31 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2017-12-04 Werner Lemberg <wl@gnu.org>
[truetype] Allow shared points in `cvar' table (#52532).
* src/truetype/ttgxvar.c (tt_face_vary_cvt): Implement it by copying
and adjusting the corresponding code from
`TT_Vary_Apply_Glyph_Deltas'.
2017-11-28 Werner Lemberg <wl@gnu.org>
[truetype] Improving tracing of composite glyphs.

81
src/truetype/ttgxvar.c
View File

@ -2941,8 +2941,10 @@
FT_Fixed* im_start_coords = NULL;
FT_Fixed* im_end_coords = NULL;
GX_Blend blend = face->blend;
FT_UInt point_count;
FT_UShort* localpoints;
FT_UInt point_count, spoint_count = 0;
FT_UShort* sharedpoints = NULL;
FT_UShort* localpoints = NULL;
FT_UShort* points;
FT_Short* deltas;
@ -3011,9 +3013,19 @@
offsetToData += table_start;
/* The documentation implies there are flags packed into */
/* `tupleCount', but John Jenkins says that shared points don't apply */
/* to `cvar', and no other flags are defined. */
if ( tupleCount & GX_TC_TUPLES_SHARE_POINT_NUMBERS )
{
here = FT_Stream_FTell( stream );
FT_Stream_SeekSet( stream, offsetToData );
sharedpoints = ft_var_readpackedpoints( stream,
table_len,
&spoint_count );
offsetToData = FT_Stream_FTell( stream );
FT_Stream_SeekSet( stream, here );
}
FT_TRACE5(( "cvar: there are %d tuples:\n", tupleCount & 0xFFF ));
@ -3029,26 +3041,25 @@
tupleDataSize = FT_GET_USHORT();
tupleIndex = FT_GET_USHORT();
/* There is no provision here for a global tuple coordinate section, */
/* so John says. There are no tuple indices, just embedded tuples. */
if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
{
for ( j = 0; j < blend->num_axis; j++ )
tuple_coords[j] = FT_GET_SHORT() * 4; /* convert from */
/* short frac to fixed */
}
else
else if ( ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) >= blend->tuplecount )
{
/* skip this tuple; it makes no sense */
FT_TRACE2(( "tt_face_vary_cvt:"
" invalid tuple index\n" ));
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
for ( j = 0; j < 2 * blend->num_axis; j++ )
(void)FT_GET_SHORT();
offsetToData += tupleDataSize;
continue;
error = FT_THROW( Invalid_Table );
goto Exit;
}
else
FT_MEM_COPY(
tuple_coords,
&blend->tuplecoords[( tupleIndex & 0xFFF ) * blend->num_axis],
blend->num_axis * sizeof ( FT_Fixed ) );
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
{
@ -3063,11 +3074,8 @@
tuple_coords,
im_start_coords,
im_end_coords );
if ( /* tuple isn't active for our blend */
apply == 0 ||
/* global points not allowed, */
/* if they aren't local, makes no sense */
!( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) )
if ( apply == 0 ) /* tuple isn't active for our blend */
{
offsetToData += tupleDataSize;
continue;
@ -3077,14 +3085,24 @@
FT_Stream_SeekSet( stream, offsetToData );
localpoints = ft_var_readpackedpoints( stream,
table_len,
&point_count );
deltas = ft_var_readpackeddeltas( stream,
table_len,
point_count == 0 ? face->cvt_size
: point_count );
if ( !localpoints || !deltas )
if ( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS )
{
localpoints = ft_var_readpackedpoints( stream,
table_len,
&point_count );
points = localpoints;
}
else
{
points = sharedpoints;
point_count = spoint_count;
}
deltas = ft_var_readpackeddeltas( stream,
table_len,
point_count == 0 ? face->cvt_size
: point_count );
if ( !points || !deltas )
; /* failure, ignore it */
else if ( localpoints == ALL_POINTS )
@ -3136,7 +3154,7 @@
FT_Long orig_cvt;
pindex = localpoints[j];
pindex = points[j];
if ( (FT_ULong)pindex >= face->cvt_size )
continue;
@ -3175,6 +3193,8 @@
FT_FRAME_EXIT();
Exit:
if ( sharedpoints != ALL_POINTS )
FT_FREE( sharedpoints );
FT_FREE( tuple_coords );
FT_FREE( im_start_coords );
FT_FREE( im_end_coords );
@ -3461,7 +3481,6 @@
glyph_start = FT_Stream_FTell( stream );
/* each set of glyph variation data is formatted similarly to `cvar' */
/* (except we get shared points and global tuples) */
if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||