Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

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gxvmort4.c
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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;
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 )
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 
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 */
GLfloat GLfloat p
#define GXV_NAME_ENTER(name)
Definition: gxvcommn.h:301
sizeof(AF_ModuleRec)
#define FT_UNUSED(arg)
Definition: ftconfig.h:76
gxv_mort_subtable_type4_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmort4.c:105
#define GXV_EXIT
Definition: gxvcommn.h:302
FT_Bytes lookuptbl_head
Definition: gxvcommn.h:249
const FT_Byte * FT_Bytes
Definition: fttypes.h:161
GLintptr offset
GLsizei const GLfloat * value
gxv_LookupTable_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvcommn.c:755
#define FT_NEXT_USHORT(buffer)
Definition: ftstream.h:226
GXV_Lookup_Fmt4_Transit_Func lookupfmt4_trans
Definition: gxvcommn.h:248
GXV_Lookup_Value_Validate_Func lookupval_func
Definition: gxvcommn.h:247
GXV_LookupValue_SignSpec lookupval_sign
Definition: gxvcommn.h:246
unsigned short FT_UShort
Definition: fttypes.h:205
GLenum GLsizei GLenum GLenum const GLvoid * table
gxv_glyphid_validate(FT_UShort gid, GXV_Validator valid)
Definition: gxvcommn.c:813
GLint limit
#define FT_LOCAL_DEF(x)
Definition: ftconfig.h:236
#define GXV_LIMIT_CHECK(_count)
Definition: gxvcommn.h:272