1 /***************************************************************************/
5 /* TrueTypeGX/AAT mort table validation */
6 /* body for type4 (Non-Contextual Glyph Substitution) subtable. */
8 /* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
11 /* This file is part of the FreeType project, and may only be used, */
12 /* modified, and distributed under the terms of the FreeType project */
13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
14 /* this file you indicate that you have read the license and */
15 /* understand and accept it fully. */
17 /***************************************************************************/
19 /***************************************************************************/
21 /* gxvalid is derived from both gxlayout module and otvalid module. */
22 /* Development of gxlayout is supported by the Information-technology */
23 /* Promotion Agency(IPA), Japan. */
25 /***************************************************************************/
31 /*************************************************************************/
33 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
34 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
35 /* messages during execution. */
38 #define FT_COMPONENT trace_gxvmort
42 gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph,
43 GXV_LookupValueCPtr value_p,
48 gxv_glyphid_validate( value_p->u, valid );
52 +===============+ --------+
59 | firstGlyph[0] | | head of lookup table
61 | offset[0] | -> | offset [byte]
63 | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
78 static GXV_LookupValueDesc
79 gxv_mort_subtable_type4_lookupfmt4_transit(
80 FT_UShort relative_gindex,
81 GXV_LookupValueCPtr base_value_p,
82 FT_Bytes lookuptbl_limit,
88 GXV_LookupValueDesc value;
90 /* XXX: check range? */
91 offset = (FT_UShort)( base_value_p->u +
92 relative_gindex * sizeof ( FT_UShort ) );
94 p = valid->lookuptbl_head + offset;
95 limit = lookuptbl_limit;
98 value.u = FT_NEXT_USHORT( p );
105 gxv_mort_subtable_type4_validate( FT_Bytes table,
107 GXV_Validator valid )
112 GXV_NAME_ENTER( "mort chain subtable type4 "
113 "(Non-Contextual Glyph Substitution)" );
115 valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
116 valid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate;
117 valid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit;
119 gxv_LookupTable_validate( p, limit, valid );