read.c revision d2f28e1b 
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 FT_FONT_FORMATS_H
33#include "X11/Xos.h"
34#include "fonttosfnt.h"
35#include "X11/fonts/fontenc.h"
36
37#define FLOOR2(x, y) ((x) >= 0 ? (x) / (y) : -(((-(x)) + (y) - 1) / (y)))
38#define CEIL2(x, y) (FLOOR2((x) + (y) - 1, (y)))
39#define FT_Pos_DOWN(x) (FLOOR2((x),64))
40#define FT_Pos_UP(x) (CEIL2((x), 64))
41#define MIN(x, y) (((x) <= (y)) ? (x) : (y))
42#define STREAM_FILE(stream) ((FILE*)stream->descriptor.pointer)
43
44static int ft_inited = 0;
45static FT_Library ft_library;
46
47static int
48FT_Ensure_Inited(void)
49{
50    int rc;
51    if(ft_inited)
52        return 0;
53
54    rc = FT_Init_FreeType(&ft_library);
55    if(rc != 0)
56        return rc;
57
58    ft_inited = 1;
59    return 0;
60}
61
62static unsigned long
63forwardRead(FT_Stream stream, unsigned long offset, unsigned char *buffer,
64            unsigned long count) {
65    unsigned char skip_buffer[BUFSIZ];
66    unsigned long skip_count;
67    FILE *file = STREAM_FILE(stream);
68
69    /* We may be asked to skip forward, but by not doing so we increase our
70       chance of survival. */
71    if(count == 0)
72        return ferror(file) == 0 ? 0 : 1;
73
74    if(offset < stream->pos) {
75        fprintf(stderr, "Cannot move backward in input stream.\n");
76        return 0;
77    }
78    while((skip_count = MIN(BUFSIZ, offset - stream->pos))) {
79        if(fread(skip_buffer, sizeof(*skip_buffer), skip_count, file) <
80           skip_count)
81            return 0;
82        stream->pos += sizeof(*skip_buffer) * skip_count;
83    }
84
85    return (unsigned long)fread(buffer, sizeof(*buffer), count, file);
86}
87
88static void
89streamClose(FT_Stream stream) {
90    fclose(STREAM_FILE(stream));
91    stream->descriptor.pointer = NULL;
92    stream->size = 0;
93}
94
95int
96readFile(char *filename, FontPtr font)
97{
98    int j, k, index;
99    int rc;
100    FT_Open_Args input = { 0 };
101    FT_Face face;
102    StrikePtr strike;
103    BitmapPtr bitmap;
104    int symbol = 0;
105    int force_unicode = 1;
106    const char *family_name, *encoding_name, *file_format;
107    FontMapPtr mapping = NULL;
108    FontMapReversePtr reverse = NULL;
109
110
111    rc = FT_Ensure_Inited();
112    if(rc != 0)
113        return rc;
114
115    if(filename != NULL) {
116        input.pathname = filename;
117        input.flags = FT_OPEN_PATHNAME;
118    } else {
119        input.flags = FT_OPEN_STREAM | FT_OPEN_DRIVER;
120        input.driver = FT_Get_Module(ft_library, "bdf");
121        input.stream = calloc(1, sizeof(FT_StreamRec));
122        if(input.stream == NULL)
123            return -1;
124
125        input.stream->size = 0x7FFFFFFF;
126        input.stream->descriptor.pointer = stdin;
127        input.stream->read = forwardRead;
128        input.stream->close = streamClose;
129    }
130    rc = FT_Open_Face(ft_library, &input, 0, &face);
131    if(rc != 0) {
132        fprintf(stderr, "Couldn't open face %s.\n",
133                filename ? filename : "<stdin>");
134        return -1;
135    }
136
137    file_format = FT_Get_Font_Format(face);
138    if(strcmp(file_format, "BDF") != 0)
139	fprintf(stderr,
140		"font file %s is of format %s.\n"
141		"It's recommended to convert directly from a BDF font.\n"
142		"Some font properties may get lost when converting via a PCF font.\n",
143		filename ? filename : "<stdin>",
144		file_format);
145
146    /* FreeType will insist on encodings which are simple subsets of unicode
147     * to be read as unicode regardless of what we call them. */
148    for(j = 0; j < face->num_charmaps; ++j) {
149        if((face->charmaps[j]->encoding == ft_encoding_none) ||
150           (face->charmaps[j]->encoding == ft_encoding_adobe_standard)) {
151            force_unicode = 0;
152            break;
153        }
154    }
155
156    encoding_name = faceEncoding(face);
157    if(encoding_name == NULL) {
158        symbol = 1;
159    } else if(strcasecmp(encoding_name, "iso10646-1") != 0) {
160        if(reencode_flag)
161            mapping = FontEncMapFind(encoding_name,
162                                     FONT_ENCODING_UNICODE, 0, 0, NULL);
163        if(mapping == NULL) {
164            symbol = 1;
165        } else {
166            reverse = FontMapReverse(mapping);
167            if(reverse == NULL) {
168                fprintf(stderr, "Couldn't reverse mapping.\n");
169                return -1;
170            }
171        }
172    }
173
174    if(face->family_name)
175        family_name = face->family_name;
176    else
177	family_name = faceStringProp(face, "FONT");
178
179    if(verbose_flag) {
180        fprintf(stderr, "%s %s %s: %d sizes%s\n",
181                filename ? filename : "<stdin>",
182                face->family_name, face->style_name, face->num_fixed_sizes,
183                symbol ? " (symbol)" : "");
184    }
185
186    if(font->numNames == 0 && face->style_name && family_name) {
187        char *full_name, *unique_name, *buf;
188        int i;
189        if(strcmp(face->style_name, "Regular") == 0)
190            full_name = sprintf_alloc("%s", family_name);
191        else
192            full_name = sprintf_alloc("%s %s",
193                                      family_name, face->style_name);
194
195        /* The unique name doesn't actually need to be globally
196           unique; it only needs to be unique among all installed fonts on a
197           Windows system.  We don't bother getting it quite right. */
198        if(face->num_fixed_sizes <= 0)
199            unique_name = sprintf_alloc("%s "XVENDORNAMESHORT" bitmap",
200                                        full_name);
201        else if(face->available_sizes[0].width ==
202                face->available_sizes[0].height)
203            unique_name = sprintf_alloc("%s "XVENDORNAMESHORT
204					   " bitmap size %d",
205                                           full_name,
206                                           face->available_sizes[0].height);
207        else
208            unique_name = sprintf_alloc("%s "XVENDORNAMESHORT
209                                        " bitmap size %dx%d",
210                                        full_name,
211                                        face->available_sizes[0].width,
212                                        face->available_sizes[0].height);
213
214        font->names = malloc(10 * sizeof(FontNameEntryRec));
215        if(font->names == NULL) {
216            fprintf(stderr, "Couldn't allocate names.\n");
217            return -1;
218        }
219        i = 0;
220
221	buf = faceStringProp(face, "COPYRIGHT");
222	if(buf) {
223            font->names[i].nid = 0;
224            font->names[i].size = 2 * strlen(buf);
225            font->names[i].value = makeUTF16(buf);
226	    free(buf);
227            i++;
228	}
229
230        font->names[i].nid = 1;
231        font->names[i].size = 2 * strlen(family_name);
232        font->names[i].value = makeUTF16(family_name);
233        i++;
234
235        font->names[i].nid = 2;
236        font->names[i].size = 2 * strlen(face->style_name);
237        font->names[i].value = makeUTF16(face->style_name);
238        i++;
239
240        font->names[i].nid = 3;
241        font->names[i].size = 2 * strlen(unique_name);
242        font->names[i].value = makeUTF16(unique_name);
243        i++;
244
245        font->names[i].nid = 4;
246        font->names[i].size = 2 * strlen(full_name);
247        font->names[i].value = makeUTF16(full_name);
248        i++;
249
250        font->names[i].nid = 5;
251        font->names[i].size = 2 * strlen("Version 0.0");
252        font->names[i].value = makeUTF16("Version 0.0");
253        i++;
254
255	buf = faceStringProp(face, "FOUNDRY");
256	if(buf) {
257            font->names[i].nid = 8;
258	    font->names[i].size = 2 * strlen(buf);
259	    font->names[i].value = makeUTF16(buf);
260	    free(buf);
261            i++;
262	}
263
264        font->names[i].nid = 10;
265        font->names[i].size = 2 * strlen(XVENDORNAMESHORT
266					 " converted bitmap font");
267        font->names[i].value = makeUTF16(XVENDORNAMESHORT
268					 " converted bitmap font");
269        i++;
270#ifdef __VENDORWEBSUPPORT__
271        font->names[i].nid = 11;
272        font->names[i].size = 2 * strlen(__VENDORWEBSUPPORT__);
273        font->names[i].value = makeUTF16(__VENDORWEBSUPPORT__);
274        i++;
275#endif
276        font->numNames = i;
277    }
278
279    if(face->num_fixed_sizes == 0) {
280        fprintf(stderr, "No bitmaps in face.\n");
281        return -1;
282    }
283
284    if((!symbol && !mapping) || force_unicode) {
285        rc = FT_Select_Charmap(face, ft_encoding_unicode);
286    } else {
287        rc = FT_Select_Charmap(face, ft_encoding_none);
288        if(rc != 0) {
289            /* BDF will default to Adobe Standard even for nonstandard
290             * encodings, so try that as a last resort. */
291            rc = FT_Select_Charmap(face, ft_encoding_adobe_standard);
292        }
293    }
294    if(rc != 0) {
295        fprintf(stderr, "Couldn't select character map: %x.\n", rc);
296        return -1;
297    }
298
299    font->flags = faceFlags(face) | (symbol ? FACE_SYMBOL : 0);
300    font->weight = faceWeight(face);
301    font->width = faceWidth(face);
302    font->foundry = faceFoundry(face);
303    font->italicAngle = faceItalicAngle(face);
304    font->pxMetrics.height = face->available_sizes[0].height;
305    font->pxMetrics.size = faceIntProp(face, "PIXEL_SIZE");
306    font->pxMetrics.xHeight = faceIntProp(face, "X_HEIGHT");
307    font->pxMetrics.capHeight = faceIntProp(face, "CAP_HEIGHT");
308    font->pxMetrics.ascent = faceIntProp(face, "FONT_ASCENT");
309    font->pxMetrics.descent = faceIntProp(face, "FONT_DESCENT");
310    font->pxMetrics.underlinePosition = faceIntProp(face, "UNDERLINE_POSITION");
311    font->pxMetrics.underlineThickness = faceIntProp(face, "UNDERLINE_THICKNESS");
312
313    for(int i = 0; i < face->num_fixed_sizes; i++) {
314        if(verbose_flag)
315            fprintf(stderr, "size %d: %dx%d\n",
316                    i,
317                    (int)((face->available_sizes[i].x_ppem + 32) >> 6),
318                    (int)((face->available_sizes[i].y_ppem + 32) >> 6));
319
320        rc = FT_Set_Pixel_Sizes(face,
321                                (face->available_sizes[i].x_ppem + 32) >> 6,
322                                (face->available_sizes[i].y_ppem + 32) >> 6);
323        if(rc != 0) {
324            fprintf(stderr, "Couldn't set size.\n");
325            return -1;
326        }
327
328        strike = makeStrike(font,
329                            (face->available_sizes[i].x_ppem + 32) >> 6,
330                            (face->available_sizes[i].y_ppem + 32) >> 6);
331        if(strike == NULL) {
332            fprintf(stderr, "Couldn't allocate strike.\n");
333            return -1;
334        }
335
336        for(j = 0; j < FONT_CODES; j++) {
337            if(mapping)
338                k = reverse->reverse(j, reverse->data);
339            else
340                k = j;
341            if(k <= 0 && j != 0)
342                continue;
343            index = FT_Get_Char_Index(face, k);
344            if(j != 0 && index == 0)
345                continue;
346            rc = FT_Load_Glyph(face, index,
347                               FT_LOAD_RENDER | FT_LOAD_MONOCHROME);
348            if(rc != 0) {
349                fprintf(stderr, "Couldn't load glyph for U+%04X (%d)\n",
350                        j, index);
351                continue;
352            }
353            bitmap = makeBitmap(strike, j,
354                                FT_Pos_UP(face->glyph->metrics.horiAdvance),
355                                FT_Pos_DOWN(face->glyph->metrics.horiBearingX),
356                                FT_Pos_DOWN(face->glyph->metrics.horiBearingY),
357                                face->glyph->bitmap.width,
358                                face->glyph->bitmap.rows,
359                                face->glyph->bitmap.pitch,
360                                face->glyph->bitmap.buffer,
361                                crop_flag);
362
363            if(bitmap == NULL) {
364                fprintf(stderr, "Couldn't create bitmap.\n");
365                return -1;
366            }
367        }
368    }
369
370    FT_Done_Face(face);
371    free(input.stream);
372
373    j = 0;
374    for(int i = 0; i < FONT_CODES; i++) {
375        int found = 0;
376        strike = font->strikes;
377        while(strike) {
378            bitmap = STRIKE_BITMAP(strike, i);
379            if(bitmap) {
380                bitmap->index = j;
381                found = 1;
382            } else {
383                if(i == 0) {
384                    fprintf(stderr,
385                            "Warning: no bitmap for the undefined glyph.\n");
386                    found = 1;
387                }
388            }
389            strike = strike->next;
390        }
391        if(found)
392            j++;
393    }
394    return 0;
395}
396