Sync with trunk r47367
[reactos.git] / lib / 3rdparty / freetype / src / gxvalid / 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 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* */
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. */
16 /* */
17 /***************************************************************************/
18
19 /***************************************************************************/
20 /* */
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. */
24 /* */
25 /***************************************************************************/
26
27
28 #include "gxvmort.h"
29
30
31 /*************************************************************************/
32 /* */
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. */
36 /* */
37 #undef FT_COMPONENT
38 #define FT_COMPONENT trace_gxvmort
39
40
41 static void
42 gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph,
43 GXV_LookupValueCPtr value_p,
44 GXV_Validator valid )
45 {
46 FT_UNUSED( glyph );
47
48 gxv_glyphid_validate( value_p->u, valid );
49 }
50
51 /*
52 +===============+ --------+
53 | lookup header | |
54 +===============+ |
55 | BinSrchHeader | |
56 +===============+ |
57 | lastGlyph[0] | |
58 +---------------+ |
59 | firstGlyph[0] | | head of lookup table
60 +---------------+ | +
61 | offset[0] | -> | offset [byte]
62 +===============+ | +
63 | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
64 +---------------+ |
65 | firstGlyph[1] | |
66 +---------------+ |
67 | offset[1] | |
68 +===============+ |
69 |
70 .... |
71 |
72 16bit value array |
73 +===============+ |
74 | value | <-------+
75 ....
76 */
77
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,
83 GXV_Validator valid )
84 {
85 FT_Bytes p;
86 FT_Bytes limit;
87 FT_UShort offset;
88 GXV_LookupValueDesc value;
89
90 /* XXX: check range? */
91 offset = (FT_UShort)( base_value_p->u +
92 relative_gindex * sizeof ( FT_UShort ) );
93
94 p = valid->lookuptbl_head + offset;
95 limit = lookuptbl_limit;
96
97 GXV_LIMIT_CHECK( 2 );
98 value.u = FT_NEXT_USHORT( p );
99
100 return value;
101 }
102
103
104 FT_LOCAL_DEF( void )
105 gxv_mort_subtable_type4_validate( FT_Bytes table,
106 FT_Bytes limit,
107 GXV_Validator valid )
108 {
109 FT_Bytes p = table;
110
111
112 GXV_NAME_ENTER( "mort chain subtable type4 "
113 "(Non-Contextual Glyph Substitution)" );
114
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;
118
119 gxv_LookupTable_validate( p, limit, valid );
120
121 GXV_EXIT;
122 }
123
124
125 /* END */