forked from minhngoc25a/freetype2
524 lines
18 KiB
C
524 lines
18 KiB
C
/***************************************************************************/
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/* */
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/* ttpload.c */
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/* */
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/* TrueType-specific tables loader (body). */
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/* */
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/* Copyright 1996-2001, 2002, 2004, 2005, 2006, 2007 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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/* Load 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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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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/* we need the size of the `glyf' table for malformed `loca' tables */
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error = face->goto_table( face, TTAG_glyf, stream, &face->glyf_len );
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if ( error )
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goto Exit;
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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 >= 0x40000L )
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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 >= 0x20000L )
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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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/* It isn't mentioned explicitly that the `loca' table must be */
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/* ordered, but implicitly it refers to the length of an entry */
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/* as the difference between the current and the next position. */
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/* Anyway, there do exist (malformed) fonts which don't obey */
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/* this rule, so we are only able to provide an upper bound for */
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/* the size. */
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if ( pos2 >= pos1 )
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*asize = (FT_UInt)( pos2 - pos1 );
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else
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*asize = (FT_UInt)( face->glyf_len - 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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/*************************************************************************/
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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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/* Load 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 TT_USE_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 /* !TT_USE_BYTECODE_INTERPRETER */
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FT_UNUSED( face );
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FT_UNUSED( stream );
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return TT_Err_Ok;
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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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/* Load the font 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 TT_USE_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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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->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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Exit:
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return error;
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#else /* !TT_USE_BYTECODE_INTERPRETER */
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FT_UNUSED( face );
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FT_UNUSED( stream );
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return TT_Err_Ok;
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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_prep */
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/* */
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/* <Description> */
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/* Load 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_prep( TT_Face face,
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FT_Stream stream )
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{
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#ifdef TT_USE_BYTECODE_INTERPRETER
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FT_Error error;
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FT_ULong table_len;
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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 /* !TT_USE_BYTECODE_INTERPRETER */
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FT_UNUSED( face );
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FT_UNUSED( stream );
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return TT_Err_Ok;
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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_hdmx */
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/* */
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/* <Description> */
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/* Load the `hdmx' table into the face object. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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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_hdmx( 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_UInt version, nn, num_records;
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FT_ULong table_size, record_size;
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FT_Byte* p;
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FT_Byte* limit;
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/* this table is optional */
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error = face->goto_table( face, TTAG_hdmx, stream, &table_size );
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if ( error || table_size < 8 )
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return TT_Err_Ok;
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if ( FT_FRAME_EXTRACT( table_size, face->hdmx_table ) )
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goto Exit;
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p = face->hdmx_table;
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limit = p + table_size;
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version = FT_NEXT_USHORT( p );
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num_records = FT_NEXT_USHORT( p );
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record_size = FT_NEXT_ULONG( p );
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/* The maximum number of bytes in an hdmx device record is the */
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/* maximum number of glyphs + 2; this is 0xFFFF + 2; this is */
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/* the reason why `record_size' is a long (which we read as */
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/* unsigned long for convenience). In practice, two bytes */
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/* sufficient to hold the size value. */
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/* */
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/* There are at least two fonts, HANNOM-A and HANNOM-B version */
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/* 2.0 (2005), which get this wrong: The upper two bytes of */
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/* the size value are set to 0xFF instead of 0x00. We catch */
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/* and fix this. */
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if ( record_size >= 0xFFFF0000UL )
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record_size &= 0xFFFFU;
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/* The limit for `num_records' is a heuristic value. */
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if ( version != 0 || num_records > 255 || record_size > 0x10001L )
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{
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error = TT_Err_Invalid_File_Format;
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goto Fail;
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}
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if ( FT_NEW_ARRAY( face->hdmx_record_sizes, num_records ) )
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goto Fail;
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for ( nn = 0; nn < num_records; nn++ )
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{
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if ( p + record_size > limit )
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break;
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face->hdmx_record_sizes[nn] = p[0];
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p += record_size;
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}
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face->hdmx_record_count = nn;
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face->hdmx_table_size = table_size;
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face->hdmx_record_size = record_size;
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Exit:
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return error;
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Fail:
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FT_FRAME_RELEASE( face->hdmx_table );
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face->hdmx_table_size = 0;
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goto Exit;
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}
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FT_LOCAL_DEF( void )
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tt_face_free_hdmx( TT_Face face )
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{
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FT_Stream stream = face->root.stream;
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FT_Memory memory = stream->memory;
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FT_FREE( face->hdmx_record_sizes );
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FT_FRAME_RELEASE( face->hdmx_table );
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}
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/*************************************************************************/
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/* */
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/* Return the advance width table for a given pixel size if it is found */
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/* in the font's `hdmx' table (if any). */
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/* */
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FT_LOCAL_DEF( FT_Byte* )
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tt_face_get_device_metrics( TT_Face face,
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FT_UInt ppem,
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FT_UInt gindex )
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{
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FT_UInt nn;
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FT_Byte* result = NULL;
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FT_ULong record_size = face->hdmx_record_size;
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FT_Byte* record = face->hdmx_table + 8;
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for ( nn = 0; nn < face->hdmx_record_count; nn++ )
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if ( face->hdmx_record_sizes[nn] == ppem )
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{
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gindex += 2;
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if ( gindex < record_size )
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result = record + nn * record_size + gindex;
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break;
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}
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return result;
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}
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/* END */
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