read.c revision ea148d1d 
1/* $XdotOrg: xc/programs/fonttosfnt/read.c,v 1.2 2004/04/23 19:54:32 eich Exp $ */
2/*
3Copyright (c) 2002 by Juliusz Chroboczek
4
5Permission is hereby granted, free of charge, to any person obtaining a copy
6of this software and associated documentation files (the "Software"), to deal
7in the Software without restriction, including without limitation the rights
8to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9copies of the Software, and to permit persons to whom the Software is
10furnished to do so, subject to the following conditions:
11
12The above copyright notice and this permission notice shall be included in
13all copies or substantial portions of the Software.
14
15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
18AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21THE SOFTWARE.
22*/
23/* $XdotOrg: xc/programs/fonttosfnt/read.c,v 1.2 2004/04/23 19:54:32 eich Exp $ */
24/* $XFree86: xc/programs/fonttosfnt/read.c,v 1.5 2003/12/19 02:05:39 dawes Exp $ */
25
26#include <stdio.h>
27
28#include <ft2build.h>
29#include FT_FREETYPE_H
30#include FT_MODULE_H
31#include FT_BDF_H
32#include "X11/Xos.h"
33#include "fonttosfnt.h"
34#include "X11/fonts/fontenc.h"
35
36#define FLOOR2(x, y) ((x) >= 0 ? (x) / (y) : -(((-(x)) + (y) - 1) / (y)))
37#define CEIL2(x, y) (FLOOR2((x) + (y) - 1, (y)))
38#define FT_Pos_DOWN(x) (FLOOR2((x),64))
39#define FT_Pos_UP(x) (CEIL2((x), 64))
40#define MIN(x, y) (((x) <= (y)) ? (x) : (y))
41#define STREAM_FILE(stream) ((FILE*)stream->descriptor.pointer)
42
43static int ft_inited = 0;
44static FT_Library ft_library;
45
46static int
47FT_Ensure_Inited(void)
48{
49    int rc;
50    if(ft_inited)
51        return 0;
52
53    rc = FT_Init_FreeType(&ft_library);
54    if(rc != 0)
55        return rc;
56
57    ft_inited = 1;
58    return 0;
59}
60
61static unsigned long
62forwardRead(FT_Stream stream, unsigned long offset, unsigned char *buffer,
63            unsigned long count) {
64    unsigned char skip_buffer[BUFSIZ];
65    unsigned long skip_count;
66    FILE *file = STREAM_FILE(stream);
67
68    /* We may be asked to skip forward, but by not doing so we increase our
69       chance of survival. */
70    if(count == 0)
71        return ferror(file) == 0 ? 0 : 1;
72
73    if(offset < stream->pos) {
74        fprintf(stderr, "Cannot move backward in input stream.\n");
75        return 0;
76    }
77    while((skip_count = MIN(BUFSIZ, offset - stream->pos))) {
78        if(fread(skip_buffer, sizeof(*skip_buffer), skip_count, file) <
79           skip_count)
80            return 0;
81        stream->pos += sizeof(*skip_buffer) * skip_count;
82    }
83
84    return (unsigned long)fread(buffer, sizeof(*buffer), count, file);
85}
86
87static void
88streamClose(FT_Stream stream) {
89    fclose(STREAM_FILE(stream));
90    stream->descriptor.pointer = NULL;
91    stream->size = 0;
92}
93
94int
95readFile(char *filename, FontPtr font)
96{
97    int j, k, index;
98    int rc;
99    FT_Open_Args input = { 0 };
100    FT_Face face;
101    StrikePtr strike;
102    BitmapPtr bitmap;
103    int symbol = 0;
104    int force_unicode = 1;
105    char *encoding_name = NULL;
106    FontMapPtr mapping = NULL;
107    FontMapReversePtr reverse = NULL;
108
109
110    rc = FT_Ensure_Inited();
111    if(rc != 0)
112        return rc;
113
114    if(filename != NULL) {
115        input.pathname = filename;
116        input.flags = FT_OPEN_PATHNAME;
117    } else {
118        input.flags = FT_OPEN_STREAM | FT_OPEN_DRIVER;
119        input.driver = FT_Get_Module(ft_library, "bdf");
120        input.stream = calloc(1, sizeof(FT_StreamRec));
121        if(input.stream == NULL)
122            return -1;
123
124        input.stream->size = 0x7FFFFFFF;
125        input.stream->descriptor.pointer = stdin;
126        input.stream->read = forwardRead;
127        input.stream->close = streamClose;
128    }
129    rc = FT_Open_Face(ft_library, &input, 0, &face);
130    if(rc != 0) {
131        fprintf(stderr, "Couldn't open face %s.\n",
132                filename ? filename : "<stdin>");
133        return -1;
134    }
135
136    /* FreeType will insist on encodings which are simple subsets of unicode
137     * to be read as unicode regardless of what we call them. */
138    for(j = 0; j < face->num_charmaps; ++j) {
139        if((face->charmaps[j]->encoding == ft_encoding_none) ||
140           (face->charmaps[j]->encoding == ft_encoding_adobe_standard)) {
141            force_unicode = 0;
142            break;
143        }
144    }
145
146    encoding_name = faceEncoding(face);
147    if(encoding_name == NULL) {
148        symbol = 1;
149    } else if(strcasecmp(encoding_name, "iso10646-1") != 0) {
150        if(reencode_flag)
151            mapping = FontEncMapFind(encoding_name,
152                                     FONT_ENCODING_UNICODE, 0, 0, NULL);
153        if(mapping == NULL) {
154            symbol = 1;
155        } else {
156            reverse = FontMapReverse(mapping);
157            if(reverse == NULL) {
158                fprintf(stderr, "Couldn't reverse mapping.\n");
159                return -1;
160            }
161        }
162    }
163
164    if(verbose_flag) {
165        fprintf(stderr, "%s %s %s: %d sizes%s\n",
166                filename ? filename : "<stdin>",
167                face->family_name, face->style_name, face->num_fixed_sizes,
168                symbol ? " (symbol)" : "");
169    }
170
171    if(font->numNames == 0 && face->style_name && face->family_name) {
172        char *full_name, *unique_name;
173        BDF_PropertyRec prop;
174        int i;
175        if(strcmp(face->style_name, "Regular") == 0)
176            full_name = sprintf_alloc("%s", face->family_name);
177        else
178            full_name = sprintf_alloc("%s %s",
179                                      face->family_name, face->style_name);
180
181        /* The unique name doesn't actually need to be globally
182           unique; it only needs to be unique among all installed fonts on a
183           Windows system.  We don't bother getting it quite right. */
184        if(face->num_fixed_sizes <= 0)
185            unique_name = sprintf_alloc("%s "XVENDORNAMESHORT" bitmap",
186                                        full_name);
187        else if(face->available_sizes[0].width ==
188                face->available_sizes[0].height)
189            unique_name = sprintf_alloc("%s "XVENDORNAMESHORT
190					   " bitmap size %d",
191                                           full_name,
192                                           face->available_sizes[0].height);
193        else
194            unique_name = sprintf_alloc("%s "XVENDORNAMESHORT
195                                        " bitmap size %dx%d",
196                                        full_name,
197                                        face->available_sizes[0].width,
198                                        face->available_sizes[0].height);
199
200        font->names = malloc(10 * sizeof(FontNameEntryRec));
201        if(font->names == NULL) {
202            fprintf(stderr, "Couldn't allocate names.\n");
203            return -1;
204        }
205        i = 0;
206
207        rc = FT_Get_BDF_Property(face, "COPYRIGHT", &prop);
208        if(rc == 0 && prop.type == BDF_PROPERTY_TYPE_ATOM) {
209            font->names[i].nid = 0;
210            font->names[i].size = 2 * strlen(prop.u.atom);
211            font->names[i].value = makeUTF16((char*)prop.u.atom);
212            i++;
213        }
214
215        font->names[i].nid = 1;
216        font->names[i].size = 2 * strlen(face->family_name);
217        font->names[i].value = makeUTF16(face->family_name);
218        i++;
219
220        font->names[i].nid = 2;
221        font->names[i].size = 2 * strlen(face->style_name);
222        font->names[i].value = makeUTF16(face->style_name);
223        i++;
224
225        font->names[i].nid = 3;
226        font->names[i].size = 2 * strlen(unique_name);
227        font->names[i].value = makeUTF16(unique_name);
228        i++;
229
230        font->names[i].nid = 4;
231        font->names[i].size = 2 * strlen(full_name);
232        font->names[i].value = makeUTF16(full_name);
233        i++;
234
235        font->names[i].nid = 5;
236        font->names[i].size = 2 * strlen("Version 0.0");
237        font->names[i].value = makeUTF16("Version 0.0");
238        i++;
239
240        rc = FT_Get_BDF_Property(face, "FOUNDRY", &prop);
241        if(rc == 0 && prop.type == BDF_PROPERTY_TYPE_ATOM) {
242            font->names[i].nid = 8;
243            font->names[i].size = 2 * strlen(prop.u.atom);
244            font->names[i].value = makeUTF16((char*)prop.u.atom);
245            i++;
246        }
247
248        font->names[i].nid = 10;
249        font->names[i].size = 2 * strlen(XVENDORNAMESHORT
250					 " converted bitmap font");
251        font->names[i].value = makeUTF16(XVENDORNAMESHORT
252					 " converted bitmap font");
253        i++;
254#ifdef __VENDORWEBSUPPORT__
255        font->names[i].nid = 11;
256        font->names[i].size = 2 * strlen(__VENDORWEBSUPPORT__);
257        font->names[i].value = makeUTF16(__VENDORWEBSUPPORT__);
258        i++;
259#endif
260        font->numNames = i;
261
262        font->flags = faceFlags(face) | (symbol ? FACE_SYMBOL : 0);
263        font->weight = faceWeight(face);
264        font->width = faceWidth(face);
265        font->foundry = faceFoundry(face);
266        font->italicAngle = faceItalicAngle(face);
267
268        rc = FT_Get_BDF_Property(face, "UNDERLINE_POSITION", &prop);
269        if(rc == 0 && prop.type == BDF_PROPERTY_TYPE_INTEGER)
270            font->underlinePosition =
271                (double)prop.u.integer / face->available_sizes[0].height *
272                TWO_SIXTEENTH;
273        else
274            font->underlinePosition =
275                - 1.5 / face->available_sizes[0].height * TWO_SIXTEENTH;
276
277        rc = FT_Get_BDF_Property(face, "UNDERLINE_THICKNESS", &prop);
278        if(rc == 0 && prop.type == BDF_PROPERTY_TYPE_INTEGER)
279            font->underlineThickness =
280                (double)prop.u.integer / face->available_sizes[0].height *
281                TWO_SIXTEENTH;
282        else
283            font->underlineThickness =
284                1.0 / face->available_sizes[0].height * TWO_SIXTEENTH;
285    }
286
287    if(face->num_fixed_sizes == 0) {
288        fprintf(stderr, "No bitmaps in face.\n");
289        return -1;
290    }
291
292    if((!symbol && !mapping) || force_unicode) {
293        rc = FT_Select_Charmap(face, ft_encoding_unicode);
294    } else {
295        rc = FT_Select_Charmap(face, ft_encoding_none);
296        if(rc != 0) {
297            /* BDF will default to Adobe Standard even for nonstandard
298             * encodings, so try that as a last resort. */
299            rc = FT_Select_Charmap(face, ft_encoding_adobe_standard);
300        }
301    }
302    if(rc != 0) {
303        fprintf(stderr, "Couldn't select character map: %x.\n", rc);
304        return -1;
305    }
306
307    for(int i = 0; i < face->num_fixed_sizes; i++) {
308        if(verbose_flag)
309            fprintf(stderr, "size %d: %dx%d\n",
310                    i,
311                    (int)((face->available_sizes[i].x_ppem + 32) >> 6),
312                    (int)((face->available_sizes[i].y_ppem + 32) >> 6));
313
314        rc = FT_Set_Pixel_Sizes(face,
315                                (face->available_sizes[i].x_ppem + 32) >> 6,
316                                (face->available_sizes[i].y_ppem + 32) >> 6);
317        if(rc != 0) {
318            fprintf(stderr, "Couldn't set size.\n");
319            return -1;
320        }
321
322        strike = makeStrike(font,
323                            (face->available_sizes[i].x_ppem + 32) >> 6,
324                            (face->available_sizes[i].y_ppem + 32) >> 6);
325        if(strike == NULL) {
326            fprintf(stderr, "Couldn't allocate strike.\n");
327            return -1;
328        }
329
330        for(j = 0; j < FONT_CODES; j++) {
331            if(mapping)
332                k = reverse->reverse(j, reverse->data);
333            else
334                k = j;
335            if(k <= 0 && j != 0)
336                continue;
337            index = FT_Get_Char_Index(face, k);
338            if(j != 0 && index == 0)
339                continue;
340            rc = FT_Load_Glyph(face, index,
341                               FT_LOAD_RENDER | FT_LOAD_MONOCHROME);
342            if(rc != 0) {
343                fprintf(stderr, "Couldn't load glyph for U+%04X (%d)\n",
344                        j, index);
345                continue;
346            }
347            bitmap = makeBitmap(strike, j,
348                                FT_Pos_UP(face->glyph->metrics.horiAdvance),
349                                FT_Pos_DOWN(face->glyph->metrics.horiBearingX),
350                                FT_Pos_DOWN(face->glyph->metrics.horiBearingY),
351                                face->glyph->bitmap.width,
352                                face->glyph->bitmap.rows,
353                                face->glyph->bitmap.pitch,
354                                face->glyph->bitmap.buffer,
355                                crop_flag);
356
357            if(bitmap == NULL) {
358                fprintf(stderr, "Couldn't create bitmap.\n");
359                return -1;
360            }
361        }
362    }
363
364    FT_Done_Face(face);
365    free(input.stream);
366
367    j = 0;
368    for(int i = 0; i < FONT_CODES; i++) {
369        int found = 0;
370        strike = font->strikes;
371        while(strike) {
372            bitmap = STRIKE_BITMAP(strike, i);
373            if(bitmap) {
374                bitmap->index = j;
375                found = 1;
376            } else {
377                if(i == 0) {
378                    fprintf(stderr,
379                            "Warning: no bitmap for the undefined glyph.\n");
380                    found = 1;
381                }
382            }
383            strike = strike->next;
384        }
385        if(found)
386            j++;
387    }
388    return 0;
389}
390