446 lines
13 KiB
C
446 lines
13 KiB
C
/***************************************************************************/
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/* */
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/* ttpload.c */
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/* */
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/* TrueType glyph data/program tables loader (body). */
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/* */
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/* Copyright 1996-2001, 2002, 2004, 2005 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_INTERNAL_STREAM_H
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#include FT_TRUETYPE_TAGS_H
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#include "ttpload.h"
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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#include "ttgxvar.h"
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#endif
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#include "tterrors.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttpload
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_load_loca */
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/* */
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/* <Description> */
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/* Loads the locations table. */
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/* */
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/* <InOut> */
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/* face :: A handle to the target face object. */
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/* */
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/* <Input> */
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/* stream :: The input stream. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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#ifdef FT_OPTIMIZE_MEMORY
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_loca( TT_Face face,
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FT_Stream stream )
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{
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FT_Error error;
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FT_ULong table_len;
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FT_TRACE2(( "Locations " ));
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error = face->goto_table( face, TTAG_loca, stream, &table_len );
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if ( error )
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{
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error = TT_Err_Locations_Missing;
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goto Exit;
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}
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if ( face->header.Index_To_Loc_Format != 0 )
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{
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if ( table_len >= 0x40000 )
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{
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FT_TRACE2(( "table too large!\n" ));
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error = TT_Err_Invalid_Table;
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goto Exit;
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}
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face->num_locations = (FT_UInt)( table_len >> 2 );
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}
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else
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{
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if ( table_len >= 0x20000 )
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{
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FT_TRACE2(( "table too large!\n" ));
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error = TT_Err_Invalid_Table;
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goto Exit;
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}
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face->num_locations = (FT_UInt)( table_len >> 1 );
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}
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/*
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* Extract the frame. We don't need to decompress it since
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* we are able to parse it directly.
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*/
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if ( FT_FRAME_EXTRACT( table_len, face->glyph_locations ) )
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goto Exit;
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FT_TRACE2(( "loaded\n" ));
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Exit:
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return error;
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}
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FT_LOCAL_DEF( FT_ULong )
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tt_face_get_location( TT_Face face,
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FT_UInt gindex,
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FT_UInt *asize )
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{
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FT_ULong pos1, pos2;
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FT_Byte* p;
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FT_Byte* p_limit;
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pos1 = pos2 = 0;
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if ( gindex < face->num_locations )
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{
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if ( face->header.Index_To_Loc_Format != 0 )
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{
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p = face->glyph_locations + gindex * 4;
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p_limit = face->glyph_locations + face->num_locations * 4;
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pos1 = FT_NEXT_ULONG( p );
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pos2 = pos1;
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if ( p + 4 <= p_limit )
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pos2 = FT_NEXT_ULONG( p );
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}
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else
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{
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p = face->glyph_locations + gindex * 2;
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p_limit = face->glyph_locations + face->num_locations * 2;
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pos1 = FT_NEXT_USHORT( p );
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pos2 = pos1;
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if ( p + 2 <= p_limit )
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pos2 = FT_NEXT_USHORT( p );
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pos1 <<= 1;
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pos2 <<= 1;
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}
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}
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*asize = (FT_UInt)( pos2 - pos1 );
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return pos1;
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}
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FT_LOCAL_DEF( void )
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tt_face_done_loca( TT_Face face )
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{
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FT_Stream stream = face->root.stream;
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FT_FRAME_RELEASE( face->glyph_locations );
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face->num_locations = 0;
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}
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#else /* !FT_OPTIMIZE_MEMORY */
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_loca( TT_Face face,
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FT_Stream stream )
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{
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FT_Error error;
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FT_Memory memory = stream->memory;
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FT_Short LongOffsets;
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FT_ULong table_len;
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FT_TRACE2(( "Locations " ));
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LongOffsets = face->header.Index_To_Loc_Format;
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error = face->goto_table( face, TTAG_loca, stream, &table_len );
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if ( error )
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{
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error = TT_Err_Locations_Missing;
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goto Exit;
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}
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if ( LongOffsets != 0 )
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{
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face->num_locations = (FT_UShort)( table_len >> 2 );
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FT_TRACE2(( "(32bit offsets): %12d ", face->num_locations ));
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if ( FT_NEW_ARRAY( face->glyph_locations, face->num_locations ) )
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goto Exit;
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if ( FT_FRAME_ENTER( face->num_locations * 4L ) )
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goto Exit;
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{
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FT_Long* loc = face->glyph_locations;
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FT_Long* limit = loc + face->num_locations;
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for ( ; loc < limit; loc++ )
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*loc = FT_GET_LONG();
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}
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FT_FRAME_EXIT();
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}
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else
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{
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face->num_locations = (FT_UShort)( table_len >> 1 );
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FT_TRACE2(( "(16bit offsets): %12d ", face->num_locations ));
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if ( FT_NEW_ARRAY( face->glyph_locations, face->num_locations ) )
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goto Exit;
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if ( FT_FRAME_ENTER( face->num_locations * 2L ) )
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goto Exit;
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{
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FT_Long* loc = face->glyph_locations;
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FT_Long* limit = loc + face->num_locations;
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for ( ; loc < limit; loc++ )
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*loc = (FT_Long)( (FT_ULong)FT_GET_USHORT() * 2 );
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}
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FT_FRAME_EXIT();
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}
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FT_TRACE2(( "loaded\n" ));
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Exit:
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return error;
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}
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FT_LOCAL_DEF( FT_ULong )
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tt_face_get_location( TT_Face face,
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FT_UInt gindex,
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FT_UInt *asize )
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{
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FT_ULong offset;
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FT_UInt count;
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offset = face->glyph_locations[gindex];
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count = 0;
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if ( gindex < (FT_UInt)face->num_locations - 1 )
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count = (FT_UInt)( face->glyph_locations[gindex + 1] - offset );
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*asize = count;
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return offset;
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}
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FT_LOCAL_DEF( void )
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tt_face_done_loca( TT_Face face )
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{
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FT_Memory memory = face->root.memory;
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FT_FREE( face->glyph_locations );
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face->num_locations = 0;
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}
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#endif /* !FT_OPTIMIZE_MEMORY */
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_load_cvt */
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/* */
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/* <Description> */
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/* Loads the control value table into a face object. */
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/* */
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/* <InOut> */
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/* face :: A handle to the target face object. */
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/* */
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/* <Input> */
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/* stream :: A handle to the input stream. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_cvt( TT_Face face,
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FT_Stream stream )
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{
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#ifdef FT_CONFIG_OPTION_BYTECODE_INTERPRETER
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FT_Error error;
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FT_Memory memory = stream->memory;
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FT_ULong table_len;
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FT_TRACE2(( "CVT " ));
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error = face->goto_table( face, TTAG_cvt, stream, &table_len );
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if ( error )
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{
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FT_TRACE2(( "is missing!\n" ));
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face->cvt_size = 0;
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face->cvt = NULL;
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error = TT_Err_Ok;
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goto Exit;
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}
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face->cvt_size = table_len / 2;
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if ( FT_NEW_ARRAY( face->cvt, face->cvt_size ) )
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goto Exit;
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if ( FT_FRAME_ENTER( face->cvt_size * 2L ) )
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goto Exit;
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{
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FT_Short* cur = face->cvt;
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FT_Short* limit = cur + face->cvt_size;
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for ( ; cur < limit; cur++ )
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*cur = FT_GET_SHORT();
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}
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FT_FRAME_EXIT();
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FT_TRACE2(( "loaded\n" ));
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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if ( face->doblend )
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error = tt_face_vary_cvt( face, stream );
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#endif
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Exit:
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return error;
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#else /* !FT_CONFIG_OPTION_BYTECODE_INTERPRETER */
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FT_UNUSED( face );
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FT_UNUSED( stream );
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return 0;
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#endif
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_load_fpgm */
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/* */
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/* <Description> */
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/* Loads the font program and the cvt program. */
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/* */
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/* <InOut> */
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/* face :: A handle to the target face object. */
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/* */
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/* <Input> */
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/* stream :: A handle to the input stream. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_fpgm( TT_Face face,
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FT_Stream stream )
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{
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#ifdef FT_CONFIG_OPTION_BYTECODE_INTERPRETER
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FT_Error error;
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FT_ULong table_len;
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FT_TRACE2(( "Font program " ));
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/* The font program is optional */
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error = face->goto_table( face, TTAG_fpgm, stream, &table_len );
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if ( error )
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{
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face->font_program = NULL;
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face->font_program_size = 0;
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FT_TRACE2(( "is missing!\n" ));
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}
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else
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{
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face->font_program_size = table_len;
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if ( FT_FRAME_EXTRACT( table_len, face->font_program ) )
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goto Exit;
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FT_TRACE2(( "loaded, %12d bytes\n", face->font_program_size ));
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}
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FT_TRACE2(( "Prep program " ));
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error = face->goto_table( face, TTAG_prep, stream, &table_len );
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if ( error )
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{
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face->cvt_program = NULL;
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face->cvt_program_size = 0;
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error = TT_Err_Ok;
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FT_TRACE2(( "is missing!\n" ));
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}
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else
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{
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face->cvt_program_size = table_len;
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if ( FT_FRAME_EXTRACT( table_len, face->cvt_program ) )
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goto Exit;
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FT_TRACE2(( "loaded, %12d bytes\n", face->cvt_program_size ));
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}
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Exit:
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return error;
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#else /* !FT_CONFIG_OPTION_BYTECODE_INTERPRETER */
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FT_UNUSED( face );
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FT_UNUSED( stream );
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return 0;
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#endif
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}
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/* END */
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