271 lines
9.6 KiB
C
271 lines
9.6 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 1996-2000 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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#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_Load_Locations */
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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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FT_LOCAL_DEF
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FT_Error TT_Load_Locations( 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 ( ALLOC_ARRAY( face->glyph_locations,
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face->num_locations,
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FT_Long ) )
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goto Exit;
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if ( ACCESS_Frame( 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 = GET_Long();
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}
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FORGET_Frame();
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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 ( ALLOC_ARRAY( face->glyph_locations,
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face->num_locations,
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FT_Long ) )
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goto Exit;
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if ( ACCESS_Frame( 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)GET_UShort() * 2 );
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}
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FORGET_Frame();
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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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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_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
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FT_Error TT_Load_CVT( 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_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 ( ALLOC_ARRAY( face->cvt,
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face->cvt_size,
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FT_Short ) )
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goto Exit;
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if ( ACCESS_Frame( 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 = GET_Short();
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}
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FORGET_Frame();
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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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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Load_Progams */
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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
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FT_Error TT_Load_Programs( 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(( "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 ( EXTRACT_Frame( 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 ( EXTRACT_Frame( 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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}
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/* END */
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