* src/cff/cffload.c, src/cff/cffload.h, src/cff/cffgload.c,
src/cff/cfftypes.h: formatting + do not load the CFF index offsets into memory, since this wastes a *lot* of heap memory with large Asian CFF fonts. There is no significant performance loss
This commit is contained in:
David Turner
parent
82dba7620e
commit
5dbdb6c3c4
@ -1,6 +1,10 @@
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2007-01-04 David Turner <david@freetype.org>
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* src/cff/cffload.c: formatting
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* src/cff/cffload.c, src/cff/cffload.h, src/cff/cffgload.c,
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src/cff/cfftypes.h: formatting + do not load the CFF index
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offsets into memory, since this wastes a *lot* of heap memory
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with large Asian CFF fonts. There is no significant performance
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loss
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2007-01-04 David Turner <david@freetype.org>
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@ -2291,9 +2291,8 @@
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if ( cff->top_font.font_dict.cid_registry != 0xFFFFU &&
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cff->charset.cids )
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{
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if ( glyph_index < cff->charset.max_cid )
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glyph_index = cff->charset.cids[glyph_index];
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else
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glyph_index = cff_charset_cid_to_gindex( &cff->charset, glyph_index );
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if ( glyph_index == 0 )
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return CFF_Err_Invalid_Argument;
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}
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else if ( glyph_index >= cff->num_glyphs )
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@ -2423,13 +2422,13 @@
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/* See how charstring loads at cff_index_access_element() in */
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/* cffload.c. */
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{
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CFF_IndexRec csindex = cff->charstrings_index;
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CFF_Index csindex = &cff->charstrings_index;
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glyph->root.control_data =
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csindex.bytes + csindex.offsets[glyph_index] - 1;
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glyph->root.control_len =
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charstring_len;
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if (csindex->offsets)
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{
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glyph->root.control_data = csindex->bytes + csindex->offsets[glyph_index] - 1;
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glyph->root.control_len = charstring_len;
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}
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}
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}
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@ -193,11 +193,33 @@
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_cffload
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/* read an offset from the index's stream current position */
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static FT_ULong
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cff_index_read_offset( CFF_Index idx,
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FT_Error *perror )
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{
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FT_Error error;
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FT_Stream stream = idx->stream;
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FT_Byte tmp[4];
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FT_ULong result = 0;
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if ( !FT_STREAM_READ( tmp, idx->off_size ) )
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{
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FT_Int nn;
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for ( nn = 0; nn < idx->off_size; nn++ )
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result = (result << 8) | tmp[nn];
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}
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*perror = error;
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return result;
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}
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static FT_Error
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cff_new_index( CFF_Index idx,
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FT_Stream stream,
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FT_Bool load )
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cff_index_init( CFF_Index idx,
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FT_Stream stream,
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FT_Bool load )
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{
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FT_Error error;
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FT_Memory memory = stream->memory;
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@ -207,14 +229,12 @@
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FT_MEM_ZERO( idx, sizeof ( *idx ) );
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idx->stream = stream;
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idx->start = FT_STREAM_POS();
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if ( !FT_READ_USHORT( count ) &&
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count > 0 )
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{
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FT_Byte* p;
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FT_Byte offsize;
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FT_ULong data_size;
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FT_ULong* poff;
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FT_Byte* p_end;
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FT_ULong size, last_offset;
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/* there is at least one element; read the offset size, */
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@ -228,12 +248,86 @@
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goto Exit;
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}
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idx->stream = stream;
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idx->count = count;
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idx->off_size = offsize;
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data_size = (FT_ULong)( count + 1 ) * offsize;
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size = (FT_ULong)( count + 1 ) * offsize;
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if ( FT_NEW_ARRAY( idx->offsets, count + 1 ) ||
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idx->data_offset = idx->start + 3 + size;
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if ( FT_STREAM_SKIP( size - offsize ) )
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goto Exit;
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size = cff_index_read_offset( idx, &error );
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if (error)
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goto Exit;
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if ( size == 0 )
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{
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error = CFF_Err_Invalid_Table;
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goto Exit;
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}
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idx->data_size = --size;
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if ( load )
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{
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/* load the data */
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if ( FT_FRAME_EXTRACT( size, idx->bytes ) )
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goto Exit;
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}
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else
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{
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/* skip the data */
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if ( FT_STREAM_SKIP( size ) )
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goto Exit;
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}
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}
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Exit:
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if ( error )
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FT_FREE( idx->offsets );
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return error;
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}
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static void
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cff_index_done( CFF_Index idx )
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{
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if ( idx->stream )
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{
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FT_Stream stream = idx->stream;
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FT_Memory memory = stream->memory;
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if ( idx->bytes )
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FT_FRAME_RELEASE( idx->bytes );
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FT_FREE( idx->offsets );
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FT_MEM_ZERO( idx, sizeof ( *idx ) );
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}
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}
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static FT_Error
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cff_index_load_offsets( CFF_Index idx )
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{
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FT_Error error = 0;
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FT_Stream stream = idx->stream;
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FT_Memory memory = stream->memory;
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if ( idx->count > 0 && idx->offsets == NULL )
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{
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FT_Byte offsize = idx->off_size;
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FT_ULong data_size;
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FT_Byte* p;
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FT_Byte* p_end;
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FT_ULong* poff;
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data_size = (FT_ULong)( idx->count + 1 ) * offsize;
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if ( FT_NEW_ARRAY( idx->offsets, idx->count + 1 ) ||
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FT_STREAM_SEEK( idx->start + 3 ) ||
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FT_FRAME_ENTER( data_size ) )
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goto Exit;
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@ -264,48 +358,16 @@
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}
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FT_FRAME_EXIT();
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idx->data_offset = FT_STREAM_POS();
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data_size = poff[-1] - 1;
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if ( load )
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{
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/* load the data */
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if ( FT_FRAME_EXTRACT( data_size, idx->bytes ) )
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goto Exit;
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}
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else
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{
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/* skip the data */
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if ( FT_STREAM_SKIP( data_size ) )
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goto Exit;
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}
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}
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Exit:
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if ( error )
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if (error)
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FT_FREE( idx->offsets );
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return error;
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}
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static void
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cff_done_index( CFF_Index idx )
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{
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if ( idx->stream )
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{
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FT_Stream stream = idx->stream;
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FT_Memory memory = stream->memory;
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if ( idx->bytes )
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FT_FRAME_RELEASE( idx->bytes );
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FT_FREE( idx->offsets );
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FT_MEM_ZERO( idx, sizeof ( *idx ) );
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}
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}
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/* allocate a table containing pointers to an index's elements */
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@ -321,6 +383,13 @@
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*table = 0;
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if ( idx->offsets == NULL )
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{
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error = cff_index_load_offsets( idx );
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if ( error )
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goto Exit;
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}
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if ( idx->count > 0 && !FT_NEW_ARRAY( t, idx->count + 1 ) )
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{
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old_offset = 1;
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@ -330,6 +399,10 @@
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if ( !offset )
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offset = old_offset;
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/* sanity check for invalid offset tables */
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else if ( offset < old_offset || offset-1 >= idx->data_size )
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offset = old_offset;
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t[n] = idx->bytes + offset - 1;
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old_offset = offset;
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@ -337,6 +410,7 @@
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*table = t;
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}
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Exit:
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return error;
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}
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@ -353,21 +427,43 @@
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if ( idx && idx->count > element )
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{
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/* compute start and end offsets */
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FT_ULong off1, off2 = 0;
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FT_Stream stream = idx->stream;
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FT_ULong off1, off2 = 0;
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off1 = idx->offsets[element];
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if ( off1 )
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/* load offsets from file or the offset table */
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if ( !idx->offsets )
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{
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do
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FT_ULong pos = element*idx->off_size;
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if ( FT_STREAM_SEEK( idx->start + 3 + pos ) )
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goto Exit;
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off1 = cff_index_read_offset( idx, &error );
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if (error) goto Exit;
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if ( off1 != 0 )
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{
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element++;
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off2 = idx->offsets[element];
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do
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{
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element++;
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off2 = cff_index_read_offset( idx, &error );
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}
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while ( off2 == 0 && element < idx->count );
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}
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}
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else /* use offsets table */
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{
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off1 = idx->offsets[element];
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if ( off1 )
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{
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do
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{
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element++;
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off2 = idx->offsets[element];
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} while ( off2 == 0 && element < idx->count );
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if ( !off2 )
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off1 = 0;
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} while ( off2 == 0 && element < idx->count );
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}
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}
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/* access element */
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@ -383,9 +479,6 @@
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else
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{
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/* this index is still on disk/file, access it through a frame */
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FT_Stream stream = idx->stream;
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if ( FT_STREAM_SEEK( idx->data_offset + off1 - 1 ) ||
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FT_FRAME_EXTRACT( off2 - off1, *pbytes ) )
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goto Exit;
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@ -660,6 +753,18 @@
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}
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FT_LOCAL_DEF( FT_UInt )
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cff_charset_cid_to_gindex( CFF_Charset charset,
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FT_UInt cid )
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{
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FT_UInt result = 0;
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if ( cid < charset->max_cid )
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result = charset->cids[cid];
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return result;
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}
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static void
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cff_charset_free_cids( CFF_Charset charset,
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FT_Memory memory )
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@ -1209,7 +1314,7 @@
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priv->local_subrs_offset ) )
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goto Exit;
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error = cff_new_index( &font->local_subrs_index, stream, 1 );
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error = cff_index_init( &font->local_subrs_index, stream, 1 );
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if ( error )
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goto Exit;
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@ -1231,7 +1336,7 @@
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{
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if ( subfont )
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{
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cff_done_index( &subfont->local_subrs_index );
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cff_index_done( &subfont->local_subrs_index );
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FT_FREE( subfont->local_subrs );
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}
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}
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@ -1287,10 +1392,10 @@
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goto Exit;
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/* read the name, top dict, string and global subrs index */
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if ( FT_SET_ERROR( cff_new_index( &font->name_index, stream, 0 )) ||
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FT_SET_ERROR( cff_new_index( &font->font_dict_index, stream, 0 )) ||
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FT_SET_ERROR( cff_new_index( &font->string_index, stream, 0 )) ||
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FT_SET_ERROR( cff_new_index( &font->global_subrs_index, stream, 1 )) )
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if ( FT_SET_ERROR( cff_index_init( &font->name_index, stream, 0 )) ||
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FT_SET_ERROR( cff_index_init( &font->font_dict_index, stream, 0 )) ||
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FT_SET_ERROR( cff_index_init( &font->string_index, stream, 0 )) ||
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FT_SET_ERROR( cff_index_init( &font->global_subrs_index, stream, 1 )) )
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goto Exit;
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/* well, we don't really forget the `disabled' fonts... */
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@ -1318,7 +1423,7 @@
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if ( FT_STREAM_SEEK( base_offset + dict->charstrings_offset ) )
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goto Exit;
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error = cff_new_index( &font->charstrings_index, stream, 0 );
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error = cff_index_init( &font->charstrings_index, stream, 0 );
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if ( error )
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goto Exit;
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@ -1335,7 +1440,7 @@
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if ( FT_STREAM_SEEK( base_offset + dict->cid_fd_array_offset ) )
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goto Exit;
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error = cff_new_index( &fd_index, stream, 0 );
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error = cff_index_init( &fd_index, stream, 0 );
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if ( error )
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goto Exit;
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@ -1371,7 +1476,7 @@
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base_offset + dict->cid_fd_select_offset );
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Fail_CID:
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cff_done_index( &fd_index );
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cff_index_done( &fd_index );
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if ( error )
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goto Exit;
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@ -1441,11 +1546,11 @@
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FT_UInt idx;
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cff_done_index( &font->global_subrs_index );
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cff_done_index( &font->string_index );
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cff_done_index( &font->font_dict_index );
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cff_done_index( &font->name_index );
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cff_done_index( &font->charstrings_index );
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cff_index_done( &font->global_subrs_index );
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cff_index_done( &font->string_index );
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cff_index_done( &font->font_dict_index );
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cff_index_done( &font->name_index );
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cff_index_done( &font->charstrings_index );
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/* release font dictionaries, but only if working with */
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/* a CID keyed CFF font */
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@ -52,6 +52,10 @@ FT_BEGIN_HEADER
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FT_Byte** pbytes );
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FT_LOCAL( FT_UInt )
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cff_charset_cid_to_gindex( CFF_Charset charset,
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FT_UInt cid );
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FT_LOCAL( FT_Error )
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cff_font_load( FT_Stream stream,
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FT_Int face_index,
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@ -39,6 +39,9 @@ FT_BEGIN_HEADER
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/* <Fields> */
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/* stream :: The source input stream. */
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/* */
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/* start :: The position of the first index byte in the */
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/* input stream */
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/* */
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/* count :: The number of elements in the index. */
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/* */
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/* off_size :: The size in bytes of object offsets in index. */
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@ -46,16 +49,21 @@ FT_BEGIN_HEADER
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/* data_offset :: The position of first data byte in the index's */
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/* bytes. */
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/* */
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/* offsets :: A table of element offsets in the index. */
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/* data_size :: size of data table in this index */
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/* */
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/* offsets :: A table of element offsets in the index. must be */
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/* loaded explicitely */
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/* */
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/* bytes :: If the index is loaded in memory, its bytes. */
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/* */
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typedef struct CFF_IndexRec_
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{
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FT_Stream stream;
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FT_ULong start;
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FT_UInt count;
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FT_Byte off_size;
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FT_ULong data_offset;
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FT_ULong data_size;
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FT_ULong* offsets;
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FT_Byte* bytes;
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@ -85,6 +93,8 @@ FT_BEGIN_HEADER
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FT_UShort* cids; /* the inverse mapping of `sids'; only needed */
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/* for CID-keyed fonts */
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FT_UInt max_cid;
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FT_UInt num_glyphs;
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} CFF_CharsetRec, *CFF_Charset;
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