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[woff2] Handle TTCs and start reconstructing font. 

We `handle' TTCs by modifying the `indices' array to point to only
those tables that are part of the requested `face_index'.

Set and use `num_tables' in `WOFF2_TtcFont'.

* src/sfnt/sfwoff2.c (reconstruct_font): New function.
(woff2_open_font): Start reconstruction of font.
This commit is contained in:
Nikhil Ramakrishnan 2019-07-01 01:29:30 +05:30 committed by Werner Lemberg
parent 7a1639bc1e
commit 18f6ff11f9
2 changed files with 75 additions and 14 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
2019-08-27 Nikhil Ramakrishnan <ramakrishnan.nikhil@gmail.com>
[woff2] Handle TTCs and start reconstructing font.
We `handle' TTCs by modifying the `indices' array to point to only
those tables that are part of the requested `face_index'.
Set and use `num_tables' in `WOFF2_TtcFont'.
* src/sfnt/sfwoff2.c (reconstruct_font): New function.
(woff2_open_font): Start reconstruction of font.
2019-08-27 Nikhil Ramakrishnan <ramakrishnan.nikhil@gmail.com>
[woff2] Get known tags from function.

77
src/sfnt/sfwoff2.c
View File

@ -235,6 +235,27 @@
}
static FT_Error
reconstruct_font( FT_Byte* transformed_buf,
FT_ULong transformed_buf_size,
WOFF2_Table* indices,
WOFF2_Header woff2,
FT_Int face_index,
FT_Byte* sfnt )
{
/* We're writing only one face per call, so offset is fixed. */
FT_ULong dst_offset = 12;
FT_Byte* table_entry = NULL;
FT_UNUSED( dst_offset );
FT_UNUSED( table_entry );
/* TODO reconstruct the font tables! */
return FT_Err_Ok;
}
/* Replace `face->root.stream' with a stream containing the extracted */
/* SFNT of a WOFF2 font. */
@ -247,8 +268,9 @@
FT_Error error = FT_Err_Ok;
WOFF2_HeaderRec woff2;
WOFF2_Table tables = NULL;
WOFF2_Table* indices = NULL;
WOFF2_Table tables = NULL;
WOFF2_Table* indices = NULL;
WOFF2_Table* temp_indices = NULL;
WOFF2_Table last_table;
FT_Int nn;
@ -257,7 +279,6 @@
FT_UShort xform_version;
FT_ULong src_offset = 0;
FT_UShort ttc_num_tables;
FT_UInt glyf_index;
FT_UInt loca_index;
FT_UInt64 first_table_offset;
@ -453,23 +474,23 @@
{
WOFF2_TtcFont ttc_font = woff2.ttc_fonts + nn;
if( READ_255USHORT( ttc_num_tables ) )
if( READ_255USHORT( ttc_font->num_tables ) )
goto Exit;
if( FT_READ_ULONG( ttc_font->flavor ) )
goto Exit;
if( FT_NEW_ARRAY( ttc_font->table_indices, ttc_num_tables ) )
if( FT_NEW_ARRAY( ttc_font->table_indices, ttc_font->num_tables ) )
goto Exit;
/* DEBUG - Change to TRACE4 */
FT_TRACE2(( "Number of tables in font %d: %ld\n",
nn, ttc_num_tables ));
nn, ttc_font->num_tables ));
/* DEBUG - Change to TRACE5 */
FT_TRACE2(( " Indices: " ));
glyf_index = 0;
loca_index = 0;
for ( j = 0; j < ttc_num_tables; j++ )
for ( j = 0; j < ttc_font->num_tables; j++ )
{
FT_UShort table_index;
WOFF2_Table table;
@ -492,7 +513,8 @@
/* glyf and loca must be consecutive */
if( glyf_index > 0 || loca_index > 0 )
{
if(glyf_index > loca_index || loca_index - glyf_index != 1)
if( glyf_index > loca_index ||
loca_index - glyf_index != 1 )
return FT_THROW( Invalid_Table );
/* DEBUG - Remove later */
else
@ -531,13 +553,38 @@
if( file_offset != ( ROUND4( woff2.length ) ) )
return FT_THROW( Invalid_Table );
/* TODO Add support for uncompression of TTC fonts. */
/* Redirect a TTC to exit for now. */
/* Only retain tables of the requested face in a TTC. */
/* TODO Check whether it is OK for rest of the code to be unaware of the
fact that we're working with a TTC. */
if( woff2.header_version )
{
FT_TRACE2(( "Reading TTC fonts not supported yet.\n" ));
error = FT_THROW( Unimplemented_Feature );
goto Exit;
WOFF2_TtcFont ttc_font = woff2.ttc_fonts + face_index;
/* Create a temporary array. */
if( FT_NEW_ARRAY( temp_indices,
ttc_font->num_tables ) )
goto Exit;
for ( nn = 0; nn < ttc_font->num_tables; nn++ )
{
/* DEBUG - Remove later */
FT_TRACE2(( "i=%d, table_index=%d\n",
nn, ttc_font->table_indices[nn] ));
temp_indices[nn] = indices[ttc_font->table_indices[nn]];
}
/* Resize array to required size. */
if( FT_RENEW_ARRAY( indices, woff2.num_tables,
ttc_font->num_tables ) )
goto Exit;
for ( nn = 0; nn < ttc_font->num_tables; nn++ )
indices[nn] = temp_indices[nn];
FT_FREE( temp_indices );
/* Change header values. */
woff2.flavor = ttc_font->flavor;
woff2.num_tables = ttc_font->num_tables;
}
/* Write sfnt header. */
@ -580,7 +627,7 @@
/* DEBUG - Remove later */
FT_TRACE2(( "Sorted table indices: \n" ));
for( nn = 0; nn < woff2.num_tables; ++nn )
for ( nn = 0; nn < woff2.num_tables; ++nn )
{
WOFF2_Table table = indices[nn];
/* DEBUG - Remove later */
@ -612,6 +659,8 @@
FT_FRAME_EXIT();
/* TODO Write table entries. */
reconstruct_font( uncompressed_buf, woff2.uncompressed_size,
indices, &woff2, face_index, sfnt );
error = FT_THROW( Unimplemented_Feature );
/* DEBUG - Remove later */