127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/****************************************************************************
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*
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* gxvmort4.c
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*
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* TrueTypeGX/AAT mort table validation
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* body for type4 (Non-Contextual Glyph Substitution) subtable.
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*
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* Copyright (C) 2005-2021 by
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* suzuki toshiya, Masatake YAMATO, Red Hat K.K.,
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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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/****************************************************************************
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*
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* gxvalid is derived from both gxlayout module and otvalid module.
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* Development of gxlayout is supported by the Information-technology
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* Promotion Agency(IPA), Japan.
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*
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*/
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#include "gxvmort.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 gxvmort
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static void
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gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph,
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GXV_LookupValueCPtr value_p,
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GXV_Validator gxvalid )
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{
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FT_UNUSED( glyph );
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gxv_glyphid_validate( value_p->u, gxvalid );
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}
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/*
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+===============+ --------+
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| lookup header | |
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+===============+ |
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| BinSrchHeader | |
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+===============+ |
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| lastGlyph[0] | |
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+---------------+ |
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| firstGlyph[0] | | head of lookup table
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+---------------+ | +
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| offset[0] | -> | offset [byte]
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+===============+ | +
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| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
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+---------------+ |
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| firstGlyph[1] | |
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+---------------+ |
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| offset[1] | |
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+===============+ |
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.... |
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16bit value array |
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+===============+ |
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| value | <-------+
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....
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*/
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static GXV_LookupValueDesc
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gxv_mort_subtable_type4_lookupfmt4_transit(
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FT_UShort relative_gindex,
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GXV_LookupValueCPtr base_value_p,
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FT_Bytes lookuptbl_limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p;
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FT_Bytes limit;
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FT_UShort offset;
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GXV_LookupValueDesc value;
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/* XXX: check range? */
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offset = (FT_UShort)( base_value_p->u +
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relative_gindex * sizeof ( FT_UShort ) );
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p = gxvalid->lookuptbl_head + offset;
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limit = lookuptbl_limit;
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GXV_LIMIT_CHECK( 2 );
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value.u = FT_NEXT_USHORT( p );
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return value;
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}
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FT_LOCAL_DEF( void )
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gxv_mort_subtable_type4_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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GXV_NAME_ENTER( "mort chain subtable type4 "
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"(Non-Contextual Glyph Substitution)" );
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gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
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gxvalid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate;
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gxvalid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit;
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gxv_LookupTable_validate( p, limit, gxvalid );
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GXV_EXIT;
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}
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/* END */
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