This file is indexed.

/usr/share/doc/libwmf0.2-7/tutapi.html is in libwmf-doc 0.2.8.4-10.3ubuntu1.14.04.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
<html>
<head>
<title>libwmf-0.2.0 Tutorial 1: The API</title>
</head>
<body link="#CC0000" alink="#FF3300" vlink="#330099" text="#000000" bgcolor="#ffffff"
      background="caolan/pics/weave.jpg">
<h1>libwmf-0.2.0 Tutorial 1: The API</h1>

<h2>Contents</h2>

<ul>
<li><a href="#intro">Introduction</a>
<li><a href="#headers">Header Files</a>
<li><a href="#api">Creating The <b>API</b></a>
<li><a href="#devinit">Acknowledging The Device Layer</a>
<li><a href="#scan">Scanning The Metafile</a>
<li><a href="#devsetup">Setting Up The Device Layer</a>
<li><a href="#play">Playing The Metafile</a>
<li><a href="#font">Fonts &amp; libwmf</a>
<li><a href="#fns">Other <b>API</b> Functions</a>
</ul>

<a name="intro"><h2>Introduction</h2></a>

<p>
The figure below illustrates the tripartite division of <b>application</b>,
<b>interpreter</b>, and <b>device layer</b>. The internal workings of each
of the three is irrelevant; all that matters is the three interfaces which
are separate. The core of <tt>libwmf</tt> is the interpreter, and as such
only the interfaces between (a) the interpreter and the application - the
<b>API</b> - and (b) the interpreter and the device layer - the <b>IPA</b>
- are defined. Applications that wish to implement their own new device
layer are free therefore to define whatever interface is suitable.
</p>

<table align=center><tr><td><img src="wmfpic.png"></td></tr></table>

<p>
<tt>libwmf</tt> includes two device layers: <tt>eps</tt> for conversion to
<tt>EPS</tt> (Encapsulated Postscript) or <tt>PS</tt> (Postscript); and
<tt>gd</tt> for conversion to <tt>PNG</tt> or <tt>JPEG</tt> image formats.
Included with <tt>libwmf</tt> are converters for these: <tt>wmf2eps</tt>
and <tt>wmf2gd</tt> respectively. The source-code for these is an excellent
place to see how to use the various features of the <b>API</b> and device-layer
interfaces.
</p>

<a name="headers"><h2>Header Files</h2></a>

<p>
All libwmf header files are now in a <tt>libwmf</tt> subdirectory. In general
you will need to include two. Unless you are writing a new device layer, which
will be discussed later, you should include only <tt>libwmf/api.h</tt> and the
header for whichever device layer you are interested in, for example:
</p>
<font color=blue>
<pre>
#include &#60;libwmf/api.h&#62;
#include &#60;libwmf/gd.h&#62;
</pre>
</font>
<p>
The <tt>gd</tt> device layer uses the <tt>GD</tt> library, included with
<tt>libwmf</tt>, to output images in <tt>PNG</tt> (or possibly in <tt>JPEG</tt>)
format. Alternatively, if you wish the output to be in <tt>PS</tt> or
<tt>EPS</tt> format, you would include:
</p>
<font color=blue>
<pre>
#include &#60;libwmf/api.h&#62;
#include &#60;libwmf/eps.h&#62;
</pre>
</font>

<a name="api"><h2>Creating The API</h2></a>

<p>
For each metafile you wish to process and convert to a given image type, you
must create an instance of the <b>API</b>. This can be sophisticated or simple.
In its simplest form, the only thing that needs to be specified is which
device layer you wish to use. For example, to use <tt>GD</tt>:
</p>
<font color=blue>
<pre>
	wmfAPI_Options options;
	wmfAPI* API;

	wmf_error_t error;

	unsigned long flags;

	/* */

	flags = WMF_OPT_FUNCTION;

	options.function = wmf_gd_function;

	/* Other Options */

	error = wmf_api_create (&API,flags,&options);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}

	/* */
</pre>
</font>
<p>
The library performs all memory allocation with respect to the <b>API</b>, and
destroying the instance will free up all associated memory:
</p>
<font color=blue>
<pre>
	error = wmf_api_destroy (API);
</pre>
</font>
<p>
There are a number of different options which can be used when creating the
<b>API</b>. The structure of <tt>wmfAPI_Options</tt> is:
</p>
<font color=blue>
<pre>
typedef struct _wmfAPI_Options wmfAPI_Options;

struct _wmfAPI_Options
{	void* context;

	void* (*malloc)  (void* context,size_t size);
	void* (*realloc) (void* context,void* mem,size_t size);
	void  (*free)    (void* context,void* mem);

	int    argc;
	char** argv;

	char** fontdirs; /* NULL-terminated list of directories to search for font files */

	struct
	{	wmfFontMap* wmf; /* {0,*}-terminated list: wmf-font-name -> ps-font-name */
		wmfMapping* sub; /* {0,*}-terminated list: wmf-font-name substring equiv */
		wmfMapping* ps;  /* {0,*}-terminated list: ps-font-name -> pfb-file-name */
	} font;

	char* sys_fontmap_file;
	char* xtra_fontmap_file;

	void (*function) (wmfAPI*);

	char*  module;
	char** dirs;

	FILE* debug_out;
	FILE* error_out;
};
</pre>
</font>
<ul>
<li><b>WMF_OPT_ALLOC</b><br>
If you wish to provide your own memory allocation routines for <tt>libwmf</tt>
to use instead of <tt>malloc</tt>, <tt>realloc</tt> and <tt>free</tt>, these
can be specified:
<font color=blue>
<pre>
	flags |= WMF_OPT_ALLOC;

	options.context = my_memory_manager_data;
	options.malloc  = my_malloc;
	options.realloc = my_realloc;
	options.free    = my_free;
</pre>
</font>
<li><b>WMF_OPT_ARGS</b><br>
<tt>libwmf</tt> can be allowed to check for certain command line arguments:
<pre>
  --wmf-ignore-nonfatal     ignore any non-critical errors or unsupported features
  --wmf-error=no            suppress error reports
  --wmf-debug=no            suppress debug reports
  --wmf-diagnostics         emit diagnostic information (for analysis of metafiles)
  --wmf-fontdir=&#60;path&#62;      add &#60;path&#62; to list of directories searched for fonts
  --wmf-sys-fonts           use system fonts, if any found
  --wmf-sys-fontmap=&#60;file&#62;  use system xml-fontmap file &#60;file&#62; (implies --wmf-sys-fonts)
  --wmf-xtra-fonts          use non-system fonts, if any found
  --wmf-xtra-fontmap=&#60;file&#62; use non-system xml-fontmap file &#60;file&#62; (implies --wmf-xtra-fonts)
</pre>
where the command line is specified by:
<font color=blue>
<pre>
int main (int argc,char** argv)
{	/* */

	flags |= WMF_OPT_ARGS;

	options.argc = argc;
	options.argv = argv;
</pre>
</font>
<li><b>WMF_OPT_FONTDIRS</b><br>
A <b>NULL</b>-terminated list of directories to be searched for fonts can be
specified by:
<font color=blue>
<pre>
	char* dirs[3] = { "/usr/share/fonts", "/usr/local/share/fonts", NULL };

	/* */

	flags |= WMF_OPT_FONTDIRS;

	options.fontdirs = dirs;
</pre>
</font>
<li><b>WMF_OPT_FONTMAP</b> [UNTESTED]<br>
This is a system for specifying font mappings; see section on fonts.
<li><b>WMF_OPT_SYS_FONTS</b><br>
Use any system fonts found, not just standard 13.
<li><b>WMF_OPT_SYS_FONTMAP</b> [UNTESTED]<br>
Use specified system XML fontmap file:
<font color=blue>
<pre>
	flags |= WMF_OPT_SYS_FONTS;
	flags |= WMF_OPT_SYS_FONTMAP;

	options.sys_fontmap_file = "/usr/local/share/fonts/fontmap";
</pre>
</font>
<li><b>WMF_OPT_XTRA_FONTS</b><br>
Use any system fonts found, not just standard 13.
<li><b>WMF_OPT_XTRA_FONTMAP</b> [UNTESTED]<br>
Use specified non-system XML fontmap file:
<font color=blue>
<pre>
	flags |= WMF_OPT_XTRA_FONTS;
	flags |= WMF_OPT_XTRA_FONTMAP;

	options.xtra_fontmap_file = "/usr/local/share/libwmf/fonts/fontmap";
</pre>
</font>
<li><b>WMF_OPT_FUNCTION</b><br>
This is how to initialize a device-layer with a supplied function. (Currently
this is the only way to initialize a device layer since modules are not yet
implemented.) The function is device-specific. See above.
<li><b>WMF_OPT_MODULE</b> [UNIMPLEMENTED]<br>
initialize device-layer with specified module
<li><b>WMF_OPT_MODULE_DIRS</b> [UNIMPLEMENTED]<br>
check for module also in specified directories
<li><b>WMF_OPT_IGNORE_NONFATAL</b> [HIGHLY RECOMMENDED]<br>
Ignore (some) non-fatal errors, equivalent to --wmf-ignore-nonfatal
<font color=blue>
<pre>
	flags |= WMF_OPT_IGNORE_NONFATAL;
</pre>
</font>
<li><b>WMF_OPT_NO_ERROR</b><br>
Suppress all error reports, equivalent to --wmf-error=no
<font color=blue>
<pre>
	flags |= WMF_OPT_NO_ERROR;
</pre>
</font>
<li><b>WMF_OPT_NO_DEBUG</b><br>
Suppress all debug reports, equivalent to --wmf-debug=no
<font color=blue>
<pre>
	flags |= WMF_OPT_NO_DEBUG;
</pre>
</font>
<li><b>WMF_OPT_LOG_ERROR</b> [UNTESTED]<br>
Divert error reports to specified stream:
<font color=blue>
<pre>
	FILE* e_out;

	/* */

	e_out = fopen ("error.log","w");
	if (e_out)
	{	flags |= WMF_OPT_LOG_ERROR;

		options.error_out = e_out;
	}
</pre>
</font>
<li><b>WMF_OPT_LOG_DEBUG</b> [UNTESTED]<br>
Divert debug reports to specified stream:
<font color=blue>
<pre>
	FILE* d_out;

	/* */

	d_out = fopen ("debug.log","w");
	if (d_out)
	{	flags |= WMF_OPT_LOG_DEBUG;

		options.debug_out = d_out;
	}
</pre>
</font>
</ul>

<a name="devinit"><h2>Acknowledging The Device Layer</h2></a>

<p>
In addition to creating the <b>API</b>, <tt>wmf_api_create</tt> sets up the
link with the device layer. Device layer data can be accessed through
<tt>API->device_data</tt>, but the implementation will probably provide a
convenient interface. For example, with <tt>GD</tt>:
</p>
<font color=blue>
<pre>
	wmfAPI_Options options;
	wmfAPI* API;

	wmf_error_t error;

	wmf_gd_t* ddata;

	unsigned long flags;

	/* */

	flags = WMF_OPT_FUNCTION | WMF_OPT_IGNORE_NONFATAL;

	options.function = wmf_gd_function;

	/* Other Options */

	error = wmf_api_create (&API,flags,&options);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}

	ddata = WMF_GD_GetData (API);

	if ((ddata->flags & WMF_GD_SUPPORTS_JPEG) == 0)
	{	fprintf (stderr,"libwmf does not support JPEG conversion!\n");

		wmf_api_destroy (API);

		/* */
	}

	/* */
</pre>
</font>
<p>
At this point there is little need to acknowledge the device layer, except if
(as in the above example) the device layer indicates possible restrictions.
</p>

<a name="scan"><h2>Scanning The Metafile</h2></a>

<p>
Before <i>playing</i> the metafile (i.e., rendering the image) it is necessary
first to open the metafile and second to <i>scan</i> it. To open a metafile
that is a file on disc is simple:
</p>
<font color=blue>
<pre>
	error = wmf_file_open (API,"file.wmf");
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}
</pre>
</font>
<p>
The file needs to be closed later by calling:
</p>
<font color=blue>
<pre>
	error = wmf_file_close (API);
</pre>
</font>
<p>
Alternatively, if the metafile is preloaded in memory, it can be opened with:
</p>
<font color=blue>
<pre>
	error = wmf_mem_open (API,(unsigned char*) buffer,(long) buffer_length);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}
</pre>
</font>
<p>
and closed later by calling:
</p>
<font color=blue>
<pre>
	error = wmf_mem_close (API);
</pre>
</font>
<p>
A third, more generic method is available as well, but requires more work. For
example, to `open' an already-open file stream:
</p>
<font color=blue>
<pre>
int  my_wmfRead (void*);
int  my_wmfSeek (void*,long);
long my_wmfTell (void*);

/* User redefinable functions for input-stream access:
 * wmfRead: returns unsigned char cast to int, or EOF
 */
int my_wmfRead (void* context)
{	return (fgetc ((FILE*) context));
}

/* User redefinable functions for input-stream access:
 * wmfSeek: returns (-1) on error, else 0
 */
int my_wmfSeek (void* context,long position)
{	return (fseek ((FILE*) context,position,SEEK_SET));
}

/* User redefinable functions for input-stream access:
 * wmfTell: returns (-1) on error, else pos
 */
long my_wmfTell (void* context)
{	return (ftell ((FILE*) context));
}

	/* */

	error = wmf_bbuf_input (API,my_wmfRead,my_wmfSeek,my_wmfTell,(void*) in);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}
</pre>
</font>
<p>
Once the metafile has been opened, it must be scanned. Scanning parses the
metafile without any interaction with the device layer, and its purpose is
(a) determine whether it is a valid metafile, and (b) estimate the dimensions
of the metafile.
</p>
<font color=blue>
<pre>
	wmfD_Rect bbox;

	/* */

	error = wmf_scan (API,0,&bbox);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}
</pre>
</font>
<p>
A metafile needs to be scanned, but only once. <tt>wmf_scan</tt> will reject
any further attempts to scan; <tt>wmf_play</tt> (see below) will fail unless
the metafile has been scanned.
</p>

<a name="devsetup"><h2>Setting Up The Device Layer</h2></a>

<p>
Metafiles are basically a vector-graphic format and as such they can be scaled
to any size and aspect ratio. The interpreter describes the metafile in a
scaleable manner to the device layer, and the device layer is free to scale
the metafile in any manner it chooses. As such, the device layer will almost
certainly require (a) the dimensions of the metafile found by <tt>wmf_scan</tt>
(see above), and (b) the image width and height desired by the application.
</p>
<p>
<tt>wmfD_Rect</tt> describes a bounding box in the interpreter's device
coordinates, and is defined as:
</p>
<font color=blue>
<pre>
typedef struct _wmfD_Coord wmfD_Coord;
typedef struct _wmfD_Rect  wmfD_Rect;

struct _wmfD_Coord
{	float x;
	float y;
};

struct _wmfD_Rect
{	wmfD_Coord TL;
	wmfD_Coord BR;
};
</pre>
</font>
<p>
and so an application can determine the image's aspect ratio by:
</p>
<font color=blue>
<pre>
	float aspect_ratio;

	/* */

	aspect_ratio = (bbox.BR.y - bbox.TL.y) / (bbox.BR.x - bbox.TL.x);
</pre>
</font>
<p>
<b>Note: By definition bbox.BR.y &#62; bbox.TL.y and bbox.BR.x &#62; bbox.TL.x</b>
</p>
<p>
Putting this all together, and again using <tt>GD</tt> as an example:
</p>
<font color=blue>
<pre>
	wmfAPI_Options options;
	wmfAPI* API;

	wmfD_Rect bbox;

	wmf_error_t error;

	wmf_gd_t* ddata;

	unsigned long flags;

	FILE* out;

	/* */

	flags = WMF_OPT_FUNCTION | WMF_OPT_IGNORE_NONFATAL;

	options.function = wmf_gd_function;

	/* Other Options */

	error = wmf_api_create (&API,flags,&options);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}

	ddata = WMF_GD_GetData (API);

	if ((ddata->flags & WMF_GD_SUPPORTS_JPEG) == 0)
	{	fprintf (stderr,"libwmf does not support JPEG conversion!\n");

		wmf_api_destroy (API);

		/* */
	}

	error = wmf_file_open (API,"file.wmf");
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}

	error = wmf_scan (API,0,&bbox);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}

	out = fopen ("file.jpeg","w");
	if (out == 0)
	{	wmf_api_destroy (API);

		/* */
	}

	ddata->type = wmf_gd_jpeg;

	ddata->flags |= WMF_GD_OUTPUT_FILE;
	ddata->file = out;

	ddata->bbox = bbox;

	ddata->width  = (unsigned int) ceil (ddata->bbox.BR.x - ddata->bbox.TL.x);
	ddata->height = (unsigned int) ceil (ddata->bbox.BR.y - ddata->bbox.TL.y);
</pre>
</font>
<p>
The above example doesn't do anything intelligent with the size of the image.
The converter <tt>wmf2gd</tt> sets a maximum size and scales the image
accordingly.
</p>

<a name="play"><h2>Playing The Metafile</h2></a>

<p>
The final step is simply to play the metafile:
</p>
<font color=blue>
<pre>
	error = wmf_play (API,0,0);
	if (error != wmf_E_None)
	{	wmf_api_destroy (API);

		/* */
	}
</pre>
</font>
<p>
This can be done any number of times, with varying device layer settings if
desired.
</p>

<a name="font"><h2>Fonts &amp; libwmf</h2></a>

<p>
There are a number of issues with fonts and <tt>libwmf</tt> to complicate
matters: the first is the need to translate font names specified into font
names recognized by <tt>libwmf</tt>; the second is to find the corresponding
font files; a third is to work out what encoding (char. set) to use. Described
below is <tt>libwmf</tt>'s native mechanism for dealing with these issues.
While versatile, unfortunately it requires significant effort on the part of an
application that seeks to extend the limited font mapping provided by default.
A second (experimental and optional) mechanism is provided also, and this reads
an XML file containing font information (file locations and font names); on
RedHat Linux systems this file is <tt>/usr/share/fonts/fontmap</tt>. No doubt
this is an area that will see considerable future development.
</p>
<p>
Chances are, the metafile will require fonts that are not available to
<tt>libwmf</tt>, and there must be a mechanism, therefore, for translating
metafile fontnames into usable fonts. As noted above, the
<tt>wmfAPI_Options</tt> structure passed to <tt>wmf_api_create</tt> has the
following entries:
</p>
<font color=blue>
<pre>
typedef struct _wmfAPI_Options wmfAPI_Options;

struct _wmfAPI_Options
{	/* */

	struct
	{	wmfFontMap* wmf; /* {0,*}-terminated list: wmf-font-name -> ps-font-name */
		wmfMapping* sub; /* {0,*}-terminated list: wmf-font-name substring equiv */
		wmfMapping* ps;  /* {0,*}-terminated list: ps-font-name -> pfb-file-name */
	} font;

	/* */
}
</pre>
</font>
<p>
The two mapping types are defined:
</p>
<font color=blue>
<pre>
typedef struct _wmfMapping             wmfMapping;
typedef struct _wmfFontMap             wmfFontMap;

struct _wmfMapping
{	char* name;
	char* mapping;

	FT_Encoding encoding;
};

struct _wmfFontMap
{	char* name;       /* wmf font name */

	char* normal;     /* postscript font names */
	char* italic;
	char* bold;
	char* bolditalic;
};
</pre>
</font>
<p>
Internally <tt>libwmf</tt> has the following default definitions:
</p>
<font color=blue>
<pre>
/* postscript (standard 13) font name mapping to type 1 font file
 */
static wmfMapping PSFontMap[13] = {
	{	"Courier",		"n022003l.pfb",	ft_encoding_adobe_standard	},
	{	"Courier-Oblique",	"n022023l.pfb",	ft_encoding_adobe_standard	},
	{	"Courier-Bold",		"n022004l.pfb",	ft_encoding_adobe_standard	},
	{	"Courier-BoldOblique",	"n022024l.pfb",	ft_encoding_adobe_standard	},
	{	"Helvetica",		"n019003l.pfb",	ft_encoding_adobe_standard	},
	{	"Helvetica-Oblique",	"n019023l.pfb",	ft_encoding_adobe_standard	},
	{	"Helvetica-Bold",	"n019004l.pfb",	ft_encoding_adobe_standard	},
	{	"Helvetica-BoldOblique","n019024l.pfb",	ft_encoding_adobe_standard	},
	{	"Times-Roman",		"n021003l.pfb",	ft_encoding_adobe_standard	},
	{	"Times-Italic",		"n021023l.pfb",	ft_encoding_adobe_standard	},
	{	"Times-Bold",		"n021004l.pfb",	ft_encoding_adobe_standard	},
	{	"Times-BoldItalic",	"n021024l.pfb",	ft_encoding_adobe_standard	},
	{	"Symbol",		"s050000l.pfb",	ft_encoding_adobe_custom	}};

/* exact WMF font name to postscript (standard 13) equivalent...
 * well, yeah, I know. :-(
 */
static wmfFontMap WMFFontMap[] = {
{ "Courier",		"Courier",     "Courier-Oblique",   "Courier-Bold",   "Courier-BoldOblique"   },
{ "Helvetica",		"Helvetica",   "Helvetica-Oblique", "Helvetica-Bold", "Helvetica-BoldOblique" },
{ "Modern",		"Courier",     "Courier-Oblique",   "Courier-Bold",   "Courier-BoldOblique"   },
{ "Monotype Corsiva",	"Courier",     "Courier-Oblique",   "Courier-Bold",   "Courier-BoldOblique"   },
{ "News Gothic",	"Helvetica",   "Helvetica-Oblique", "Helvetica-Bold", "Helvetica-BoldOblique" },
{ "Symbol",		"Symbol",      "Symbol",            "Symbol",         "Symbol"                },
{ "System",		"Courier",     "Courier-Oblique",   "Courier-Bold",   "Courier-BoldOblique"   },
{ "Times",		"Times-Roman", "Times-Italic",      "Times-Bold",     "Times-BoldItalic"      }};

/* Sub-string match if not in the above list;
 */
static wmfMapping SubFontMap[] = {
	{	"Arial",		"Helvetica"	},
	{	"Courier",		"Courier"	},
	{	"Fixed",		"Courier"	},
	{	"Helvetica",		"Helvetica"	},
	{	"Sans",			"Helvetica"	},
	{	"Sym",			"Symbol"	},
	{	"Terminal",		"Courier"	},
	{	"Times",		"Times"		},
	{	"Wingdings",		"Symbol"	}};

/* If all else fails, assume Times
 */
static char* DefaultFontMapping = "Times";
</pre>
</font>
<p>
Bundled with <tt>libwmf</tt> are the thirteen standard <tt>ghostscript</tt>
fonts. Unless the application specifies other fonts, <tt>libwmf</tt> will
attempt to map the metafile's font name to one of these default fonts.
</p>
<p>
First an exact match is sought with the first argument of each font in
<tt>WMFFontMap</tt>. For example, "News Gothic" would be an exact match;
"Arial" would not. If there is no exact match, then a substring search is
performed against the first argument of each font in <tt>SubFontMap</tt>.
For example, this time "Arial" would match; "Zapf Chancery" would not. If
there is still no exact match then "Times" is assumed.
</p>
<p>
Once a font name is found, this is converted to an equivalent name, assumed to
be the postscript font name, using <tt>WMFFontMap</tt>. And finally the
equivalent name is searched for in <tt>PSFontMap</tt>. For example,
"Zapf Chancery" in italics would be mapped to "Times" in italics, then to
"Times-Italic", and finally to "n021023l.pfb".
</p>
<p>
<tt>libwmf</tt> searches through the list of font directories for this file
and loads it using <tt>freetype (2)</tt> with the encoding specified by the
third argument of the <tt>PSFontMap</tt> entry.
</p>
<p>
These three lists can be prepended by using the <b>WMF_OPT_FONTMAP</b> option.
The font files can be any format supported by <tt>freetype (2)</tt>.
</p>
<p>
After the metafile has been scanned, <tt>API->fonts</tt> is a
<tt>NULL</tt>-terminated list of (postscript) font names corresponding to the
fonts selected by the interpreter.
</p>

<a name="fns"><h2>Other API Functions</h2></a>

<p>
<tt>libwmf</tt> performs all memory allocation with respect to the <b>API</b>.
When the <b>API</b> is destroyed, all associated memory is freed. The routines
for allocating and freeing such memory are:
</p>
<font color=blue>
<pre>
extern void* wmf_malloc (wmfAPI*,size_t);
extern void* wmf_calloc (wmfAPI*,size_t,size_t);
extern void* wmf_realloc (wmfAPI*,void*,size_t);
extern void  wmf_free (wmfAPI*,void*);
</pre>
</font>
<p>
These behave similarly to the standard <tt>malloc</tt>, etc. Similarly:
</p>
<font color=blue>
<pre>
extern char* wmf_strdup (wmfAPI*,char*);
</pre>
</font>
<p>
is an internal implementation of <tt>strdup</tt> which allocates the copied
string w.r.t. the <b>API</b>. On a related note,
</p>
<font color=blue>
<pre>
extern char* wmf_strstr (const char*,const char*);
</pre>
</font>
<p>
is an internal implementation of <tt>strstr</tt> and may be just a wrapper for
it. This is a special case of a function which does not refer to the
<b>API</b>.
</p>
<p>
Messages can be added to the <i>error</i> and <i>debug</i> streams using:
</p>
<font color=blue>
<pre>
extern void wmf_error (wmfAPI* API,char* srcfilename,int linenumber,char* message);
extern void wmf_debug (wmfAPI* API,char* srcfilename,int linenumber,char* message);
extern void wmf_assert (wmfAPI* API,char* srcfilename,int linenumber);
</pre>
</font>
<p>
but these functions should be used via the macros <tt>WMF_ERROR(API,"mesg")</tt>,
<tt>WMF_DEBUG(API,"mesg")</tt>, and <tt>WMF_ASSERT(API,&#60;expr&#62;)</tt>.
</p>
<p>
Finally, a call-back function can be set. This is called after each metafile
record with an estimate of the proportion of the metafile read; if the return
value is non-zero then the player will exit prematurely.
</p>
<font color=blue>
<pre>
typedef int (*wmfStatus) (void* context,float proportion);

extern void wmf_status_function (wmfAPI* API,void* context,wmfStatus function);
</pre>
</font>
<p>
For example, the following status function is used by <tt>wmf2gd</tt>:
</p>
<font color=blue>
<pre>
int wmf2gd_status (void* context,float p)
{	int percent;

	percent = (int) (p * 100);

	if (percent <  0) percent =  0;
	if (percent > 99) percent = 99;

	fprintf (stderr,"%2d%%\b\b\b",percent);
}
</pre>
</font>
<p>
Although there are other functions in the <b>API</b>, their use is <i>not</i>
recommended.
</p>

<hr>

<address>
Copyright 2001 wvWare/libwmf <a href="http://www.wvware.com/">http://www.wvware.com/</a>
</address>

</body>
</html>