1 /****************************************************************************
2 *
3 * t42drivr.c
4 *
5 * High-level Type 42 driver interface (body).
6 *
7 * Copyright (C) 2002-2023 by
8 * Roberto Alameda.
9 *
10 * This file is part of the FreeType project, and may only be used,
11 * modified, and distributed under the terms of the FreeType project
12 * license, LICENSE.TXT. By continuing to use, modify, or distribute
13 * this file you indicate that you have read the license and
14 * understand and accept it fully.
15 *
16 */
17
18
19 /**************************************************************************
20 *
21 * This driver implements Type42 fonts as described in the
22 * Technical Note #5012 from Adobe, with these limitations:
23 *
24 * 1) CID Fonts are not currently supported.
25 * 2) Incremental fonts making use of the GlyphDirectory keyword
26 * will be loaded, but the rendering will be using the TrueType
27 * tables.
28 * 3) As for Type1 fonts, CDevProc is not supported.
29 * 4) The Metrics dictionary is not supported.
30 * 5) AFM metrics are not supported.
31 *
32 * In other words, this driver supports Type42 fonts derived from
33 * TrueType fonts in a non-CID manner, as done by usual conversion
34 * programs.
35 *
36 */
37
38
39 #include "t42drivr.h"
40 #include "t42objs.h"
41 #include "t42error.h"
42 #include <freetype/internal/ftdebug.h>
43
44 #include <freetype/internal/services/svfntfmt.h>
45 #include <freetype/internal/services/svgldict.h>
46 #include <freetype/internal/services/svpostnm.h>
47 #include <freetype/internal/services/svpsinfo.h>
48
49 #undef FT_COMPONENT
50 #define FT_COMPONENT t42
51
52
53 /*
54 *
55 * GLYPH DICT SERVICE
56 *
57 */
58
59 FT_CALLBACK_DEF( FT_Error )
60 t42_get_glyph_name( FT_Face face, /* T42_Face */
61 FT_UInt glyph_index,
62 FT_Pointer buffer,
63 FT_UInt buffer_max )
64 {
65 T42_Face t42face = (T42_Face)face;
66
67
68 FT_STRCPYN( buffer,
69 t42face->type1.glyph_names[glyph_index],
70 buffer_max );
71
72 return FT_Err_Ok;
73 }
74
75
76 FT_CALLBACK_DEF( FT_UInt )
77 t42_get_name_index( FT_Face face, /* T42_Face */
78 const FT_String* glyph_name )
79 {
80 T42_Face t42face = (T42_Face)face;
81 FT_Int i;
82
83
84 for ( i = 0; i < t42face->type1.num_glyphs; i++ )
85 {
86 FT_String* gname = t42face->type1.glyph_names[i];
87
88
89 if ( glyph_name[0] == gname[0] && !ft_strcmp( glyph_name, gname ) )
90 return (FT_UInt)ft_strtol(
91 (const char *)t42face->type1.charstrings[i],
92 NULL,
93 10 );
94 }
95
96 return 0;
97 }
98
99
100 static const FT_Service_GlyphDictRec t42_service_glyph_dict =
101 {
102 (FT_GlyphDict_GetNameFunc) t42_get_glyph_name, /* get_name */
103 (FT_GlyphDict_NameIndexFunc)t42_get_name_index /* name_index */
104 };
105
106
107 /*
108 *
109 * POSTSCRIPT NAME SERVICE
110 *
111 */
112
113 FT_CALLBACK_DEF( const char* )
114 t42_get_ps_font_name( FT_Face face ) /* T42_Face */
115 {
116 T42_Face t42face = (T42_Face)face;
117
118
119 return (const char*)t42face->type1.font_name;
120 }
121
122
123 static const FT_Service_PsFontNameRec t42_service_ps_font_name =
124 {
125 (FT_PsName_GetFunc)t42_get_ps_font_name /* get_ps_font_name */
126 };
127
128
129 /*
130 *
131 * POSTSCRIPT INFO SERVICE
132 *
133 */
134
135 FT_CALLBACK_DEF( FT_Error )
136 t42_ps_get_font_info( FT_Face face,
137 PS_FontInfoRec* afont_info )
138 {
139 *afont_info = ((T42_Face)face)->type1.font_info;
140
141 return FT_Err_Ok;
142 }
143
144
145 FT_CALLBACK_DEF( FT_Error )
146 t42_ps_get_font_extra( FT_Face face,
147 PS_FontExtraRec* afont_extra )
148 {
149 *afont_extra = ((T42_Face)face)->type1.font_extra;
150
151 return FT_Err_Ok;
152 }
153
154
155 FT_CALLBACK_DEF( FT_Int )
156 t42_ps_has_glyph_names( FT_Face face )
157 {
158 FT_UNUSED( face );
159
160 return 1;
161 }
162
163
164 static const FT_Service_PsInfoRec t42_service_ps_info =
165 {
166 (PS_GetFontInfoFunc) t42_ps_get_font_info, /* ps_get_font_info */
167 (PS_GetFontExtraFunc) t42_ps_get_font_extra, /* ps_get_font_extra */
168 (PS_HasGlyphNamesFunc) t42_ps_has_glyph_names, /* ps_has_glyph_names */
169 /* Type42 fonts don't have a Private dict */
170 (PS_GetFontPrivateFunc)NULL, /* ps_get_font_private */
171 /* not implemented */
172 (PS_GetFontValueFunc) NULL /* ps_get_font_value */
173 };
174
175
176 /*
177 *
178 * SERVICE LIST
179 *
180 */
181
182 static const FT_ServiceDescRec t42_services[] =
183 {
184 { FT_SERVICE_ID_GLYPH_DICT, &t42_service_glyph_dict },
185 { FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &t42_service_ps_font_name },
186 { FT_SERVICE_ID_POSTSCRIPT_INFO, &t42_service_ps_info },
187 { FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_TYPE_42 },
188 { NULL, NULL }
189 };
190
191
192 FT_CALLBACK_DEF( FT_Module_Interface )
193 T42_Get_Interface( FT_Module module,
194 const FT_String* t42_interface )
195 {
196 FT_UNUSED( module );
197
198 return ft_service_list_lookup( t42_services, t42_interface );
199 }
200
201
202 const FT_Driver_ClassRec t42_driver_class =
203 {
204 {
205 FT_MODULE_FONT_DRIVER |
206 FT_MODULE_DRIVER_SCALABLE |
207 #ifdef TT_USE_BYTECODE_INTERPRETER
208 FT_MODULE_DRIVER_HAS_HINTER,
209 #else
210 0,
211 #endif
212
213 sizeof ( T42_DriverRec ),
214
215 "type42",
216 0x10000L,
217 0x20000L,
218
219 NULL, /* module-specific interface */
220
221 T42_Driver_Init, /* FT_Module_Constructor module_init */
222 T42_Driver_Done, /* FT_Module_Destructor module_done */
223 T42_Get_Interface, /* FT_Module_Requester get_interface */
224 },
225
226 sizeof ( T42_FaceRec ),
227 sizeof ( T42_SizeRec ),
228 sizeof ( T42_GlyphSlotRec ),
229
230 T42_Face_Init, /* FT_Face_InitFunc init_face */
231 T42_Face_Done, /* FT_Face_DoneFunc done_face */
232 T42_Size_Init, /* FT_Size_InitFunc init_size */
233 T42_Size_Done, /* FT_Size_DoneFunc done_size */
234 T42_GlyphSlot_Init, /* FT_Slot_InitFunc init_slot */
235 T42_GlyphSlot_Done, /* FT_Slot_DoneFunc done_slot */
236
237 T42_GlyphSlot_Load, /* FT_Slot_LoadFunc load_glyph */
238
239 NULL, /* FT_Face_GetKerningFunc get_kerning */
240 NULL, /* FT_Face_AttachFunc attach_file */
241 NULL, /* FT_Face_GetAdvancesFunc get_advances */
242
243 T42_Size_Request, /* FT_Size_RequestFunc request_size */
244 T42_Size_Select /* FT_Size_SelectFunc select_size */
245 };
246
247
248 /* END */