114 lines
4.6 KiB
C
114 lines
4.6 KiB
C
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/***************************************************************************/
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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 2005 by 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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/* gxvalid is derived from both gxlayout module and otvalid module. */
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/* Development of gxlayout was support of Information-technology Promotion */
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/* Agency(IPA), Japan. */
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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 trace_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_LookupValueDesc value,
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GXV_Validator valid )
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{
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gxv_glyphid_validate( value.u, valid );
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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( FT_UShort relative_gindex,
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GXV_LookupValueDesc base_value,
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FT_Bytes lookuptbl_limit,
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GXV_Validator valid )
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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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offset = base_value.u + ( relative_gindex * sizeof ( FT_UShort ) );
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p = valid->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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static 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 valid )
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{
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FT_Bytes p = table;
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GXV_NAME_ENTER( "mort chain subtable type4 (Non-Contextual Glyph Substitution)" );
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valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
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valid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate;
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valid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit;
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gxv_LookupTable_validate( p, limit, valid );
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GXV_EXIT;
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}
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/* END */
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