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 | ( FT_Face face, |
147 | PS_FontExtraRec* ) |
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 */ |
249 | |