summaryrefslogtreecommitdiff
path: root/font.go
blob: cb6ecbb7adef70f11dd406fe171104de17550800 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
/*
 * Copyright (c) 2013 Kurt Jung (Gmail: kurt.w.jung)
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package gofpdf

// Utility to generate font definition files

// Version: 1.2
// Date:    2011-06-18
// Author:  Olivier PLATHEY
// Port to Go: Kurt Jung, 2013-07-15

import (
	"bufio"
	"compress/zlib"
	"encoding/binary"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

func baseNoExt(fileStr string) string {
	str := filepath.Base(fileStr)
	extLen := len(filepath.Ext(str))
	if extLen > 0 {
		str = str[:len(str)-extLen]
	}
	return str
}

func loadMap(encodingFileStr string) (encList encListType, err error) {
	// printf("Encoding file string [%s]\n", encodingFileStr)
	var f *os.File
	// f, err = os.Open(encodingFilepath(encodingFileStr))
	f, err = os.Open(encodingFileStr)
	if err == nil {
		defer f.Close()
		for j := range encList {
			encList[j].uv = -1
			encList[j].name = ".notdef"
		}
		scanner := bufio.NewScanner(f)
		var enc encType
		var pos int
		for scanner.Scan() {
			// "!3F U+003F question"
			_, err = fmt.Sscanf(scanner.Text(), "!%x U+%x %s", &pos, &enc.uv, &enc.name)
			if err == nil {
				if pos < 256 {
					encList[pos] = enc
				} else {
					err = fmt.Errorf("map position 0x%2X exceeds 0xFF", pos)
					return
				}
			} else {
				return
			}
		}
		if err = scanner.Err(); err != nil {
			return
		}
	}
	return
}

// Return informations from a TrueType font
func getInfoFromTrueType(fileStr string, msgWriter io.Writer, embed bool, encList encListType) (info fontInfoType, err error) {
	var ttf TtfType
	ttf, err = TtfParse(fileStr)
	if err != nil {
		return
	}
	if embed {
		if !ttf.Embeddable {
			err = fmt.Errorf("font license does not allow embedding")
			return
		}
		info.Data, err = ioutil.ReadFile(fileStr)
		if err != nil {
			return
		}
		info.OriginalSize = len(info.Data)
	}
	k := 1000.0 / float64(ttf.UnitsPerEm)
	info.FontName = ttf.PostScriptName
	info.Bold = ttf.Bold
	info.Desc.ItalicAngle = int(ttf.ItalicAngle)
	info.IsFixedPitch = ttf.IsFixedPitch
	info.Desc.Ascent = round(k * float64(ttf.TypoAscender))
	info.Desc.Descent = round(k * float64(ttf.TypoDescender))
	info.UnderlineThickness = round(k * float64(ttf.UnderlineThickness))
	info.UnderlinePosition = round(k * float64(ttf.UnderlinePosition))
	info.Desc.FontBBox = fontBoxType{
		round(k * float64(ttf.Xmin)),
		round(k * float64(ttf.Ymin)),
		round(k * float64(ttf.Xmax)),
		round(k * float64(ttf.Ymax)),
	}
	// printf("FontBBox\n")
	// dump(info.Desc.FontBBox)
	info.Desc.CapHeight = round(k * float64(ttf.CapHeight))
	info.Desc.MissingWidth = round(k * float64(ttf.Widths[0]))
	var wd int
	for j := 0; j < len(info.Widths); j++ {
		wd = info.Desc.MissingWidth
		if encList[j].name != ".notdef" {
			uv := encList[j].uv
			pos, ok := ttf.Chars[uint16(uv)]
			if ok {
				wd = round(k * float64(ttf.Widths[pos]))
			} else {
				fmt.Fprintf(msgWriter, "Character %s is missing\n", encList[j].name)
			}
		}
		info.Widths[j] = wd
	}
	// printf("getInfoFromTrueType/FontBBox\n")
	// dump(info.Desc.FontBBox)
	return
}

type segmentType struct {
	marker uint8
	tp     uint8
	size   uint32
	data   []byte
}

func segmentRead(f *os.File) (s segmentType, err error) {
	if err = binary.Read(f, binary.LittleEndian, &s.marker); err != nil {
		return
	}
	if s.marker != 128 {
		err = fmt.Errorf("font file is not a valid binary Type1")
		return
	}
	if err = binary.Read(f, binary.LittleEndian, &s.tp); err != nil {
		return
	}
	if err = binary.Read(f, binary.LittleEndian, &s.size); err != nil {
		return
	}
	s.data = make([]byte, s.size)
	_, err = f.Read(s.data)
	return
}

// -rw-r--r-- 1 root root  9532 2010-04-22 11:27 /usr/share/fonts/type1/mathml/Symbol.afm
// -rw-r--r-- 1 root root 37744 2010-04-22 11:27 /usr/share/fonts/type1/mathml/Symbol.pfb

// Return informations from a Type1 font
func getInfoFromType1(fileStr string, msgWriter io.Writer, embed bool, encList encListType) (info fontInfoType, err error) {
	if embed {
		var f *os.File
		f, err = os.Open(fileStr)
		if err != nil {
			return
		}
		defer f.Close()
		// Read first segment
		var s1, s2 segmentType
		s1, err = segmentRead(f)
		if err != nil {
			return
		}
		s2, err = segmentRead(f)
		if err != nil {
			return
		}
		info.Data = s1.data
		info.Data = append(info.Data, s2.data...)
		info.Size1 = s1.size
		info.Size2 = s2.size
	}
	afmFileStr := fileStr[0:len(fileStr)-3] + "afm"
	size, ok := fileSize(afmFileStr)
	if !ok {
		err = fmt.Errorf("font file (ATM) %s not found", afmFileStr)
		return
	} else if size == 0 {
		err = fmt.Errorf("font file (AFM) %s empty or not readable", afmFileStr)
		return
	}
	var f *os.File
	f, err = os.Open(afmFileStr)
	if err != nil {
		return
	}
	defer f.Close()
	scanner := bufio.NewScanner(f)
	var fields []string
	var wd int
	var wt, name string
	wdMap := make(map[string]int)
	for scanner.Scan() {
		fields = strings.Fields(strings.TrimSpace(scanner.Text()))
		// Comment Generated by FontForge 20080203
		// FontName Symbol
		// C 32 ; WX 250 ; N space ; B 0 0 0 0 ;
		if len(fields) >= 2 {
			switch fields[0] {
			case "C":
				if wd, err = strconv.Atoi(fields[4]); err == nil {
					name = fields[7]
					wdMap[name] = wd
				}
			case "FontName":
				info.FontName = fields[1]
			case "Weight":
				wt = strings.ToLower(fields[1])
			case "ItalicAngle":
				info.Desc.ItalicAngle, err = strconv.Atoi(fields[1])
			case "Ascender":
				info.Desc.Ascent, err = strconv.Atoi(fields[1])
			case "Descender":
				info.Desc.Descent, err = strconv.Atoi(fields[1])
			case "UnderlineThickness":
				info.UnderlineThickness, err = strconv.Atoi(fields[1])
			case "UnderlinePosition":
				info.UnderlinePosition, err = strconv.Atoi(fields[1])
			case "IsFixedPitch":
				info.IsFixedPitch = fields[1] == "true"
			case "FontBBox":
				if info.Desc.FontBBox.Xmin, err = strconv.Atoi(fields[1]); err == nil {
					if info.Desc.FontBBox.Ymin, err = strconv.Atoi(fields[2]); err == nil {
						if info.Desc.FontBBox.Xmax, err = strconv.Atoi(fields[3]); err == nil {
							info.Desc.FontBBox.Ymax, err = strconv.Atoi(fields[4])
						}
					}
				}
			case "CapHeight":
				info.Desc.CapHeight, err = strconv.Atoi(fields[1])
			case "StdVW":
				info.Desc.StemV, err = strconv.Atoi(fields[1])
			}
		}
		if err != nil {
			return
		}
	}
	if err = scanner.Err(); err != nil {
		return
	}
	if info.FontName == "" {
		err = fmt.Errorf("the field FontName missing in AFM file %s", afmFileStr)
		return
	}
	info.Bold = wt == "bold" || wt == "black"
	var missingWd int
	missingWd, ok = wdMap[".notdef"]
	if ok {
		info.Desc.MissingWidth = missingWd
	}
	for j := 0; j < len(info.Widths); j++ {
		info.Widths[j] = info.Desc.MissingWidth
	}
	for j := 0; j < len(info.Widths); j++ {
		name = encList[j].name
		if name != ".notdef" {
			wd, ok = wdMap[name]
			if ok {
				info.Widths[j] = wd
			} else {
				fmt.Fprintf(msgWriter, "Character %s is missing\n", name)
			}
		}
	}
	// printf("getInfoFromType1/FontBBox\n")
	// dump(info.Desc.FontBBox)
	return
}

func makeFontDescriptor(info *fontInfoType) {
	if info.Desc.CapHeight == 0 {
		info.Desc.CapHeight = info.Desc.Ascent
	}
	info.Desc.Flags = 1 << 5
	if info.IsFixedPitch {
		info.Desc.Flags |= 1
	}
	if info.Desc.ItalicAngle != 0 {
		info.Desc.Flags |= 1 << 6
	}
	if info.Desc.StemV == 0 {
		if info.Bold {
			info.Desc.StemV = 120
		} else {
			info.Desc.StemV = 70
		}
	}
	// printf("makeFontDescriptor/FontBBox\n")
	// dump(info.Desc.FontBBox)
}

// Build differences from reference encoding
func makeFontEncoding(encList encListType, refEncFileStr string) (diffStr string, err error) {
	var refList encListType
	if refList, err = loadMap(refEncFileStr); err != nil {
		return
	}
	var buf fmtBuffer
	last := 0
	for j := 32; j < 256; j++ {
		if encList[j].name != refList[j].name {
			if j != last+1 {
				buf.printf("%d ", j)
			}
			last = j
			buf.printf("/%s ", encList[j].name)
		}
	}
	diffStr = strings.TrimSpace(buf.String())
	return
}

func makeDefinitionFile(fileStr, tpStr, encodingFileStr string, embed bool, encList encListType, info fontInfoType) (err error) {
	var def fontDefType
	def.Tp = tpStr
	def.Name = info.FontName
	makeFontDescriptor(&info)
	def.Desc = info.Desc
	// printf("makeDefinitionFile/FontBBox\n")
	// dump(def.Desc.FontBBox)
	def.Up = info.UnderlinePosition
	def.Ut = info.UnderlineThickness
	def.Cw = info.Widths
	def.Enc = baseNoExt(encodingFileStr)
	// fmt.Printf("encodingFileStr [%s], def.Enc [%s]\n", encodingFileStr, def.Enc)
	// fmt.Printf("reference [%s]\n", filepath.Join(filepath.Dir(encodingFileStr), "cp1252.map"))
	def.Diff, err = makeFontEncoding(encList, filepath.Join(filepath.Dir(encodingFileStr), "cp1252.map"))
	if err != nil {
		return
	}
	def.File = info.File
	def.Size1 = int(info.Size1)
	def.Size2 = int(info.Size2)
	def.OriginalSize = info.OriginalSize
	// printf("Font definition file [%s]\n", fileStr)
	var buf []byte
	buf, err = json.Marshal(def)
	if err != nil {
		return
	}
	var f *os.File
	f, err = os.Create(fileStr)
	if err != nil {
		return
	}
	defer f.Close()
	f.Write(buf)
	return
}

// MakeFont generates a font definition file in JSON format. A definition file
// of this type is required to use non-core fonts in the PDF documents that
// gofpdf generates. See the makefont utility in the gofpdf package for a
// command line interface to this function.
//
// fontFileStr is the name of the TrueType (or OpenType based on TrueType) or
// Type1 file from which to generate a definition file.
//
// encodingFileStr is the name of the encoding file that corresponds to the
// font.
//
// dstDirStr is the name of the directory in which to save the definition file
// and, if embed is true, the compressed font file.
//
// msgWriter is the writer that is called to display messages throughout the
// process. Use nil to turn off messages.
//
// embed is true if the font is to be embedded in the PDF files.
func MakeFont(fontFileStr, encodingFileStr, dstDirStr string, msgWriter io.Writer, embed bool) (err error) {
	if msgWriter == nil {
		msgWriter = ioutil.Discard
	}
	if !fileExist(fontFileStr) {
		err = fmt.Errorf("font file not found: %s", fontFileStr)
		return
	}
	extStr := strings.ToLower(fontFileStr[len(fontFileStr)-3:])
	// printf("Font file extension [%s]\n", extStr)
	var tpStr string
	if extStr == "ttf" || extStr == "otf" {
		tpStr = "TrueType"
	} else if extStr == "pfb" {
		tpStr = "Type1"
	} else {
		err = fmt.Errorf("unrecognized font file extension: %s", extStr)
		return
	}
	var encList encListType
	var info fontInfoType
	encList, err = loadMap(encodingFileStr)
	if err != nil {
		return
	}
	// printf("Encoding table\n")
	// dump(encList)
	if tpStr == "TrueType" {
		info, err = getInfoFromTrueType(fontFileStr, msgWriter, embed, encList)
		if err != nil {
			return
		}
	} else {
		info, err = getInfoFromType1(fontFileStr, msgWriter, embed, encList)
		if err != nil {
			return
		}
	}
	baseStr := baseNoExt(fontFileStr)
	// fmt.Printf("Base [%s]\n", baseStr)
	if embed {
		var f *os.File
		info.File = baseStr + ".z"
		zFileStr := filepath.Join(dstDirStr, info.File)
		f, err = os.Create(zFileStr)
		if err != nil {
			return
		}
		defer f.Close()
		cmp := zlib.NewWriter(f)
		cmp.Write(info.Data)
		cmp.Close()
		fmt.Fprintf(msgWriter, "Font file compressed: %s\n", zFileStr)
	}
	defFileStr := filepath.Join(dstDirStr, baseStr+".json")
	err = makeDefinitionFile(defFileStr, tpStr, encodingFileStr, embed, encList, info)
	if err != nil {
		return
	}
	fmt.Fprintf(msgWriter, "Font definition file successfully generated: %s\n", defFileStr)
	return
}