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[woff2] Support hmtx reconstruction when glyf is untransformed. 

`reconstruct_hmtx' requires `info->x_mins' and `info->num_glyphs' to
reconstruct the hmtx table. In case glyf is not transformed, we call
`get_x_mins' which does the necessary work.

(get_x_mins): New function.
(reconstruct_font): Call get_x_mins.
This commit is contained in:
Nikhil Ramakrishnan 2019-08-14 02:36:27 +05:30
parent b25c352ed4
commit 73dc5ef018
1 changed files with 89 additions and 4 deletions
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93
src/sfnt/sfwoff2.c
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@ -1170,7 +1170,92 @@
}
/* XXX What if hmtx is transformed but glyf is not? */
/* Get `x_mins' for untransformed glyf table. */
static FT_Error
get_x_mins( FT_Stream stream,
WOFF2_Table* tables,
FT_UShort num_tables,
WOFF2_Info info,
FT_Memory memory )
{
FT_UShort num_glyphs;
FT_UShort index_format;
FT_ULong glyf_offset;
FT_UShort glyf_offset_short;
FT_ULong loca_offset;
FT_Int i;
FT_Error error = FT_Err_Ok;
FT_ULong offset_size;
const WOFF2_Table glyf_table = find_table( tables, num_tables,
TTAG_glyf );
const WOFF2_Table loca_table = find_table( tables, num_tables,
TTAG_loca );
const WOFF2_Table maxp_table = find_table( tables, num_tables,
TTAG_maxp );
const WOFF2_Table head_table = find_table( tables, num_tables,
TTAG_head );
/* Read `numGlyphs' from maxp table. */
if ( FT_STREAM_SEEK( maxp_table->src_offset ) && FT_STREAM_SKIP( 8 ) )
return error;
if( FT_READ_USHORT( num_glyphs ) )
return error;
info->num_glyphs = num_glyphs;
FT_TRACE2(( "num_glyphs = %d", num_glyphs ));
/* Read `indexToLocFormat' from head table. */
if( FT_STREAM_SEEK( head_table->src_offset ) && FT_STREAM_SKIP( 50 ) )
return error;
if( FT_READ_USHORT( index_format ) )
return error;
offset_size = index_format ? 4 : 2;
/* Create x_mins array. */
if( FT_NEW_ARRAY( info->x_mins, num_glyphs ) )
return error;
loca_offset = loca_table->src_offset;
for( i = 0; i < num_glyphs; ++i )
{
if( FT_STREAM_SEEK( loca_offset ) )
return error;
loca_offset += offset_size;
if( index_format )
{
if( FT_READ_ULONG( glyf_offset ) )
return error;
}
else
{
if( FT_READ_USHORT( glyf_offset_short ) )
return error;
glyf_offset = (FT_ULong)( glyf_offset_short );
glyf_offset = glyf_offset << 1;
}
glyf_offset += glyf_table->src_offset;
if( FT_STREAM_SEEK( glyf_offset ) && FT_STREAM_SKIP( 2 ) )
return error;
if( FT_READ_USHORT( info->x_mins[i] ) )
return error;
}
return error;
}
static FT_Error
reconstruct_hmtx( FT_Stream stream,
FT_ULong transformed_size,
@ -1450,11 +1535,11 @@
}
else if( table.Tag == TTAG_hmtx )
{
/* If glyf is not transformed and hmtx is, handle separately. */
if( !is_glyf_xform )
{
FT_ERROR(( "hmtx is transformed but glyf is not.\n" ));
error = FT_THROW( Unimplemented_Feature );
goto Fail;
if( get_x_mins(stream, indices, num_tables, info, memory) )
return FT_THROW( Invalid_Table );
}
table.dst_offset = dest_offset;
if( reconstruct_hmtx( stream, table.src_length, info->num_glyphs,