sdk-world v2026.11.05
PS2 SDK - world tier (copyleft-allowed, non-essential packages)
Loading...
Searching...
No Matches
gxvmort4.c
1/****************************************************************************
2 *
3 * gxvmort4.c
4 *
5 * TrueTypeGX/AAT mort table validation
6 * body for type4 (Non-Contextual Glyph Substitution) subtable.
7 *
8 * Copyright (C) 2005-2025 by
9 * suzuki toshiya, Masatake YAMATO, Red Hat K.K.,
10 * David Turner, Robert Wilhelm, and Werner Lemberg.
11 *
12 * This file is part of the FreeType project, and may only be used,
13 * modified, and distributed under the terms of the FreeType project
14 * license, LICENSE.TXT. By continuing to use, modify, or distribute
15 * this file you indicate that you have read the license and
16 * understand and accept it fully.
17 *
18 */
19
20/****************************************************************************
21 *
22 * gxvalid is derived from both gxlayout module and otvalid module.
23 * Development of gxlayout is supported by the Information-technology
24 * Promotion Agency(IPA), Japan.
25 *
26 */
27
28
29#include "gxvmort.h"
30
31
32 /**************************************************************************
33 *
34 * The macro FT_COMPONENT is used in trace mode. It is an implicit
35 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
36 * messages during execution.
37 */
38#undef FT_COMPONENT
39#define FT_COMPONENT gxvmort
40
41
42 static void
43 gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph,
44 GXV_LookupValueCPtr value_p,
45 GXV_Validator gxvalid )
46 {
47 FT_UNUSED( glyph );
48
49 gxv_glyphid_validate( value_p->u, gxvalid );
50 }
51
52 /*
53 +===============+ --------+
54 | lookup header | |
55 +===============+ |
56 | BinSrchHeader | |
57 +===============+ |
58 | lastGlyph[0] | |
59 +---------------+ |
60 | firstGlyph[0] | | head of lookup table
61 +---------------+ | +
62 | offset[0] | -> | offset [byte]
63 +===============+ | +
64 | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
65 +---------------+ |
66 | firstGlyph[1] | |
67 +---------------+ |
68 | offset[1] | |
69 +===============+ |
70 |
71 .... |
72 |
73 16bit value array |
74 +===============+ |
75 | value | <-------+
76 ....
77 */
78
79 static GXV_LookupValueDesc
80 gxv_mort_subtable_type4_lookupfmt4_transit(
81 FT_UShort relative_gindex,
82 GXV_LookupValueCPtr base_value_p,
83 FT_Bytes lookuptbl_limit,
84 GXV_Validator gxvalid )
85 {
86 FT_Bytes p;
87 FT_Bytes limit;
88 FT_UShort offset;
89 GXV_LookupValueDesc value;
90
91 /* XXX: check range? */
92 offset = (FT_UShort)( base_value_p->u +
93 relative_gindex * sizeof ( FT_UShort ) );
94
95 p = gxvalid->lookuptbl_head + offset;
96 limit = lookuptbl_limit;
97
98 GXV_LIMIT_CHECK( 2 );
99 value.u = FT_NEXT_USHORT( p );
100
101 return value;
102 }
103
104
105 FT_LOCAL_DEF( void )
106 gxv_mort_subtable_type4_validate( FT_Bytes table,
107 FT_Bytes limit,
108 GXV_Validator gxvalid )
109 {
110 FT_Bytes p = table;
111
112
113 GXV_NAME_ENTER( "mort chain subtable type4 "
114 "(Non-Contextual Glyph Substitution)" );
115
116 gxvalid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
117 gxvalid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate;
118 gxvalid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit;
119
120 gxv_LookupTable_validate( p, limit, gxvalid );
121
122 GXV_EXIT;
123 }
124
125
126/* END */