/***************************************************************************/ | |
/* */ | |
/* gxvmort4.c */ | |
/* */ | |
/* TrueTypeGX/AAT mort table validation */ | |
/* body for type4 (Non-Contextual Glyph Substitution) subtable. */ | |
/* */ | |
/* Copyright 2005-2015 by */ | |
/* suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ | |
/* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
/* */ | |
/* This file is part of the FreeType project, and may only be used, */ | |
/* modified, and distributed under the terms of the FreeType project */ | |
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
/* this file you indicate that you have read the license and */ | |
/* understand and accept it fully. */ | |
/* */ | |
/***************************************************************************/ | |
/***************************************************************************/ | |
/* */ | |
/* gxvalid is derived from both gxlayout module and otvalid module. */ | |
/* Development of gxlayout is supported by the Information-technology */ | |
/* Promotion Agency(IPA), Japan. */ | |
/* */ | |
/***************************************************************************/ | |
#include "gxvmort.h" | |
/*************************************************************************/ | |
/* */ | |
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */ | |
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ | |
/* messages during execution. */ | |
/* */ | |
#undef FT_COMPONENT | |
#define FT_COMPONENT trace_gxvmort | |
static void | |
gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph, | |
GXV_LookupValueCPtr value_p, | |
GXV_Validator gxvalid ) | |
{ | |
FT_UNUSED( glyph ); | |
gxv_glyphid_validate( value_p->u, gxvalid ); | |
} | |
/* | |
+===============+ --------+ | |
| lookup header | | | |
+===============+ | | |
| BinSrchHeader | | | |
+===============+ | | |
| lastGlyph[0] | | | |
+---------------+ | | |
| firstGlyph[0] | | head of lookup table | |
+---------------+ | + | |
| offset[0] | -> | offset [byte] | |
+===============+ | + | |
| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte] | |
+---------------+ | | |
| firstGlyph[1] | | | |
+---------------+ | | |
| offset[1] | | | |
+===============+ | | |
| | |
.... | | |
| | |
16bit value array | | |
+===============+ | | |
| value | <-------+ | |
.... | |
*/ | |
static GXV_LookupValueDesc | |
gxv_mort_subtable_type4_lookupfmt4_transit( | |
FT_UShort relative_gindex, | |
GXV_LookupValueCPtr base_value_p, | |
FT_Bytes lookuptbl_limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p; | |
FT_Bytes limit; | |
FT_UShort offset; | |
GXV_LookupValueDesc value; | |
/* XXX: check range? */ | |
offset = (FT_UShort)( base_value_p->u + | |
relative_gindex * sizeof ( FT_UShort ) ); | |
p = gxvalid->lookuptbl_head + offset; | |
limit = lookuptbl_limit; | |
GXV_LIMIT_CHECK( 2 ); | |
value.u = FT_NEXT_USHORT( p ); | |
return value; | |
} | |
FT_LOCAL_DEF( void ) | |
gxv_mort_subtable_type4_validate( FT_Bytes table, | |
FT_Bytes limit, | |
GXV_Validator gxvalid ) | |
{ | |
FT_Bytes p = table; | |
GXV_NAME_ENTER( "mort chain subtable type4 " | |
"(Non-Contextual Glyph Substitution)" ); | |
gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; | |
gxvalid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate; | |
gxvalid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit; | |
gxv_LookupTable_validate( p, limit, gxvalid ); | |
GXV_EXIT; | |
} | |
/* END */ |