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
|
<!DOCTYPE html>
<html>
<head>
<title>mutool run: reference</title>
<link rel="stylesheet" href="style.css" type="text/css">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<header>
<h1>Calling MuPDF from JavaScript</h1>
</header>
<nav>
<a href="http://mupdf.com/index.html">About</a>
<a href="http://mupdf.com/news.html">News</a>
<a href="index.html">Documentation</a>
<a href="http://mupdf.com/downloads/">Downloads</a>
<a href="http://git.ghostscript.com/?p=mupdf.git;a=summary">Source</a>
<a href="https://bugs.ghostscript.com/">Bugs</a>
</nav>
<article>
<p>
The 'mutool run' command executes a JavaScript program, which has access to most of the features of the MuPDF library.
The command supports ECMAScript 5 syntax in strict mode.
All of the MuPDF constructors and functions live in the global object, and the command line arguments are accessible
from the global 'argv' object.
<pre>
mutool run script.js [ arguments ... ]
</pre>
<p>
If invoked without any arguments, it will drop you into an interactive REPL (read-eval-print-loop).
<h2>
Example scripts
</h2>
<p>
Create and edit PDF documents:
<ul>
<li><a href="examples/pdf-create-lowlevel.js">pdf-create-lowlevel.js</a>: Create PDF document from scratch using only low level functions.
<li><a href="examples/pdf-create.js">pdf-create.js</a>: Create PDF document from scratch, using helper functions.
<li><a href="examples/pdf-merge.js">pdf-merge.js</a>: Merge pages from multiple PDF documents into one PDF file.
</ul>
<p>
Graphics and the device interface:
<ul>
<li><a href="examples/draw-document.js">draw-document.js</a>: Draw all pages in a document to PNG files.
<li><a href="examples/draw-device.js">draw-device.js</a>: Use device API to draw graphics and save as a PNG file.
<li><a href="examples/trace-device.js">trace-device.js</a>: Implement a device in JavaScript.
</ul>
<p>
Advanced examples:
<ul>
<li><a href="examples/create-thumbnail.js">create-thumbnail.js</a>: Create a PDF from rendered page thumbnails.
</ul>
<h2>
JavaScript Shell
</h2>
<p>
Several global functions that are common for command line shells are available:
<dl>
<dt>gc(report)
<dd>Run the garbage collector to free up memory. Optionally report statistics on the garbage collection.
<dt>load(fileName)
<dd>Load and execute script in 'fileName'.
<dt>print(...)
<dd>Print arguments to stdout, separated by spaces and followed by a newline.
<dt>quit()
<dd>Exit the shell.
<dt>read(fileName)
<dd>Read the contents of a file and return them as a UTF-8 decoded string.
<dt>readline()
<dd>Read one line of input from stdin and return it as a string.
<dt>require(module)
<dd>Load a JavaScript module.
<dt>write(...)
<dd>Print arguments to stdout, separated by spaces.
</dl>
<h2>
Buffer
</h2>
<p>
The Buffer objects are used for working with binary data.
They can be used much like arrays, but are much more efficient since they
only store bytes.
<dl>
<dt>new Buffer()
<dd>Create a new empty buffer.
<dt>readFile(fileName)
<dd>Create a new buffer with the contents of a file.
<dt>Buffer#length
<dd>The number of bytes in the buffer.
<dt>Buffer#[n]
<dd>Read/write the byte at index 'n'. Will throw exceptions on out of bounds accesses.
<dt>Buffer#writeByte(b)
<dd>Append a single byte to the end of the buffer.
<dt>Buffer#writeRune(c)
<dd>Encode a unicode character as UTF-8 and append to the end of the buffer.
<dt>Buffer#writeLine(...)
<dd>Append arguments to the end of the buffer, separated by spaces, ending with a newline.
<dt>Buffer#write(...)
<dd>Append arguments to the end of the buffer, separated by spaces.
<dt>Buffer#writeBuffer(data)
<dd>Append the contents of the 'data' buffer to the end of the buffer.
<dt>Buffer#save(fileName)
<dd>Write the contents of the buffer to a file.
</dl>
<h2>
Matrices and Rectangles
</h2>
<p>
All dimensions are in points unless otherwise specified.
<p>
Matrices are simply 6-element arrays representing a 3-by-3 transformation matrix as
<pre>
/ a b 0 \
| c d 0 |
\ e f 1 /
</pre>
<p>
This matrix is represented in JavaScript as <code>[a,b,c,d,e,f]</code>.
<dl>
<dt>Identity
<dd>The identity matrix, short hand for <code>[1,0,0,1,0,0]</code>.
<dt>Scale(sx, sy)
<dd>Return a scaling matrix, short hand for <code>[sx,0,0,sy,0,0]</code>.
<dt>Translate(tx, ty)
<dd>Return a translation matrix, short hand for <code>[1,0,0,1,tx,ty]</code>.
<dt>Concat(a, b)
<dd>Concatenate matrices a and b. Bear in mind that matrix multiplication is not commutative.
</dl>
<p>
Rectangles are 4-element arrays, specifying the minimum and maximum corners (typically
upper left and lower right, in a coordinate space with the origin at the top left with
descending y): <code>[ulx,uly,lrx,lry]</code>.
<p>
If the minimum x coordinate is bigger than the maximum x coordinate, MuPDF treats the rectangle
as infinite in size.
<h2>
Document and Page
</h2>
<p>
MuPDF can open many document types (PDF, XPS, CBZ, EPUB, FB2 and a handful of image formats).
<dl>
<dt>new Document(fileName)
<dd>Open the named document.
<dt>Document#needsPassword()
<dd>Returns true if a password is required to open this password protected PDF.
<dt>Document#authenticatePassword(password)
<dd>Returns true if the password matches.
<dt>Document#getMetaData(key)
<dd>Return various meta data information. The common keys are: "format", "encryption", "info:Author", and "info:Title".
<dt>Document#layout(pageWidth, pageHeight, fontSize)
<dd>Layout a reflowable document (EPUB, FB2, or XHTML) to fit the specified page and font size.
<dt>Document#countPages()
<dd>Count the number of pages in the document. This may change if you call the layout function with different parameters.
<dt>Document#loadPage(number)
<dd>Returns a Page object for the given page number. Page number zero (0) is the first page in the document.
<dt>Document#loadOutline()
<dd>Returns an array with the outline (table of contents).
In the array is an object for each heading with the property 'title', and a property 'page' containing the page number.
If the object has a 'down' property, it contains an array with all the sub-headings for that entry.
<dt>Document#isPDF()
<dd>Returns true if the document is a PDF document.
</dl>
<dl>
<dt>setUserCSS(userStylesheet, usePublisherStyles)
<dd>Set user styles and whether to use publisher styles when laying out reflowable documents.
</dl>
<dl>
<dt>Page#bound()
<dd>Returns a rectangle containing the page dimensions.
<dt>Page#run(device, transform, skipAnnotations)
<dd>Calls device functions for all the contents on the page, using the specified transform matrix.
The device can be one of the built-in devices or a JavaScript object with methods for the device calls.
The transform maps from user space points to device space pixels.
If skipAnnotations is true, ignore annotations.
<dt>Page#toPixmap(transform, colorspace, alpha, skipAnnotations)
<dd>Render the page into a Pixmap, using the transform and colorspace.
If alpha is true, the page will be drawn on a transparent background, otherwise white.
<dt>Page#toDisplayList(skipAnnotations)
<dd>Record the contents on the page into a DisplayList.
<dt>Page#toStructuredText(options)
<dd>Extract the text on the page into a StructuredText object.
The options argument is a comma separated list of flags: preserve-ligatures, preserve-whitespace, and preserve-images.
<dt>Page#search(needle)
<dd>Search for 'needle' text on the page, and return an array with rectangles of all matches found.
<dt>Page#getAnnotations()
<dd>Return array of all annotations on the page.
<dt>Page#getLinks()
<dd>Return an array of all the links on the page.
Each link is an object with a 'bounds' property, and either a 'page' or 'uri' property,
depending on whether it's an internal or external link.
<dt>Page#isPDF()
<dd>Returns true if the page is from a PDF document.
</dl>
<dl>
<dt>Annotation#bound()
<dd>Returns a rectangle containing the location and dimension of the annotation.
<dt>Annotation#run(device, transform)
<dd>Calls device functions to draw the annotation.
<dt>Annotation#toPixmap(transform, colorspace, alpha)
<dd>Render the annotation into a Pixmap, using the transform and colorspace.
<dt>Annotation#toDisplayList()
<dd>Record the contents of the annotation into a DisplayList.
<dt>Annotation#isPDF()
<dd>Returns true if the annotation is from a PDF document.
</dl>
<h2>
StructuredText
</h2>
<p>
StructuredText objects hold text from a page that has been analyzed and grouped into blocks, lines and spans.
</p>
<dl>
<dt>StructuredText#search(needle)
<dd>Search the text for all instances of 'needle', and return an array with rectangles of all matches found.
<dt>StructuredText#highlight(p, q)
<dd>Return an array with rectangles needed to highlight a selection defined by the start and end points.
<dt>StructuredText#copy(p, q)
<dd>Return the text from the selection defined by the start and end points.
</dl>
<h2>
ColorSpace
</h2>
<dl>
<dt>DeviceGray
<dd>The default grayscale colorspace.
<dt>DeviceRGB
<dd>The default RGB colorspace.
<dt>DeviceBGR
<dd>The default RGB colorspace, but with components in reverse order.
<dt>DeviceCMYK
<dd>The default CMYK colorspace.
<dt>ColorSpace#getNumberOfComponents()
<dd>A grayscale colorspace has one component, RGB has 3, CMYK has 4, and DeviceN may have any number of components.
</dl>
<h2>
Pixmap
</h2>
<p>
A Pixmap object contains a color raster image (short for pixel map).
The components in a pixel in the pixmap are all byte values, with the transparency as the last component.
A pixmap also has a location (x, y) in addition to its size; so that they can easily be used to represent
tiles of a page.
<dl>
<dt>new Pixmap(colorspace, bounds, alpha)
<dd>Create a new pixmap. The pixel data is <b>not</b> initialized; and will contain garbage.
<dt>Pixmap#clear(value)
<dd>Clear the pixels to the specified value. Pass 255 for white, or undefined for transparent.
<dt>Pixmap#bound()
<dd>Return the pixmap bounds.
<dt>Pixmap#getWidth()
<dt>Pixmap#getHeight()
<dt>Pixmap#getNumberOfComponents()
<dd>Number of colors; plus one if an alpha channel is present.
<dt>Pixmap#getAlpha()
<dd>True if alpha channel is present.
<dt>Pixmap#getStride()
<dd>Number of bytes per row.
<dt>Pixmap#getColorSpace()
<dt>Pixmap#getXResolution()
<dt>Pixmap#getYResolution()
<dd>Image resolution in dots per inch.
<dt>Pixmap#getSample(x, y, k)
<dd>Get the value of component k at position x, y (relative to the image origin: 0, 0 is the top left pixel).
<dt>Pixmap#saveAsPNG(fileName, saveAlpha)
<dd>Save the pixmap as a PNG. Only works for Gray and RGB images.
</dl>
<h2>
DrawDevice
</h2>
<p>
The DrawDevice can be used to render to a Pixmap; either by running a Page with it or by calling its methods directly.
<dl>
<dt>new DrawDevice(transform, pixmap)
<dd>Create a device for drawing into a pixmap. The pixmap bounds used should match the transformed page bounds,
or you can adjust them to only draw a part of the page.
</dl>
<h2>
DisplayList and DisplayListDevice
</h2>
<p>
A display list records all the device calls for playback later.
If you want to run a page through several devices, or run it multiple times for any other reason,
recording the page to a display list and replaying the display list may be a performance gain
since then you can avoid reinterpreting the page each time. Be aware though, that a display list
will keep all the graphics required in memory, so will increase the amount of memory required.
<dl>
<dt>new DisplayList(mediabox)
<dd>Create an empty display list. The mediabox rect has the bounds of the page in points.
<dt>DisplayList#run(device, transform)
<dd>Play back the recorded device calls onto the device.
<dt>DisplayList#toPixmap(transform, colorspace, alpha)
<dd>Render display list to a pixmap. If alpha is true, it will render to a transparent background, otherwise white.
<dt>DisplayList#toStructuredText(options)
<dd>Extract the text in the display list into a StructuredText object.
The options argument is a comma separated list of flags: preserve-ligatures, preserve-whitespace, and preserve-images.
<dt>DisplayList#search(needle)
<dd>Search the display list text for all instances of 'needle', and return an array with rectangles of all matches found.
<dd>
</dl>
<dl>
<dt>new DisplayListDevice(displayList)
<dd>Create a device for recording onto a display list.
</dl>
<h2>
Device
</h2>
<p>
All built-in devices have the methods listed below. Any function that accepts a device will also
accept a JavaScript object with the same methods. Any missing methods are simply ignored, so you
only need to create methods for the device calls you care about.
<p>
Many of the methods take graphics objects as arguments: Path, Text, Image and Shade.
<p>
The stroking state is a dictionary with keys for:
<dl>
<dt>startCap, dashCap, endCap:
<dd>"Butt", "Round", "Square", or "Triangle".
<dt>lineCap:
<dd>Set startCap, dashCap, and endCap all at once.
<dt>lineJoin:
<dd>"Miter", "Round", "Bevel", or "MiterXPS".
<dt>lineWidth:
<dd>Thickness of the line.
<dt>miterLimit:
<dd>Maximum ratio of the miter length to line width, before beveling the join instead.
<dt>dashPhase:
<dd>Starting offset for dash pattern.
<dt>dashes:
<dd>Array of on/off dash lengths.
</dl>
<p>
Colors are specified as arrays with the appropriate number of components for the color space.
<p>
The methods that clip graphics must be balanced with a corresponding popClip.
<dl>
<dt>Device#fillPath(path, evenOdd, transform, colorspace, color, alpha)
<dt>Device#strokePath(path, stroke, transform)
<dt>Device#clipPath(path, evenOdd, transform, colorspace, color, alpha)
<dt>Device#clipStrokePath(path, stroke, transform)
<dd>Fill/stroke/clip a path.
</dl>
<dl>
<dt>Device#fillText(text, transform, colorspace, color, alpha)
<dt>Device#strokeText(text, stroke, transform, colorspace, color, alpha)
<dt>Device#clipText(text, transform)
<dt>Device#clipStrokeText(text, stroke, transform)
<dd>Fill/stroke/clip a text object.
<dt>Device#ignoreText(text, transform)
<dd>Invisible text that can be searched but should not be visible, such as for overlaying a scanned OCR image.
</dl>
<dl>
<dt>Device#fillShade(shade, transform, alpha)
<dd>Fill a shade (a.k.a. gradient). TODO: this details of gradient fills are not exposed to JavaScript yet.
<dt>Device#fillImage(shade, transform, alpha)
<dd>Draw an image. An image always fills a unit rectangle [0,0,1,1], so must be transformed to be placed and drawn at the appropriate size.
<dt>Device#fillImageMask(shade, transform, colorspace, color, alpha)
<dd>An image mask is an image without color. Fill with the color where the image is opaque.
<dt>Device#clipImageMask(shade, transform)
<dd>Clip graphics using the image to mask the areas to be drawn.
</dl>
<dl>
<dt>Device#beginMask(area, luminosity, backdropColorspace, backdropColor)
<dt>Device#endMask()
<dd>Create a soft mask. Any drawing commands between beginMask and endMask are grouped and used as a clip mask.
If luminosity is true, the mask is derived from the luminosity (grayscale value) of the graphics drawn;
otherwise the color is ignored completely and the mask is derived from the alpha of the group.
</dl>
<dl>
<dt>Device#popClip()
<dd>Pop the clip mask installed by the last clipping operation.
</dl>
<dl>
<dt>Device#beginGroup(area, isolated, knockout, blendmode, alpha)
<dt>Device#endGroup()
<dd>Push/pop a transparency blending group. Blendmode is one of the standard PDF blend modes: "Normal", "Multiply", "Screen", etc. See the PDF reference for details on isolated and knockout.
</dl>
<dl>
<dt>Device#beginTile(areaRect, viewRect, xStep, yStep, transform)
<dt>Device#endTile()
<dd>Draw a tiling pattern. Any drawing commands between beginTile and endTile are grouped and then repeated across the whole page.
Apply a clip mask to restrict the pattern to the desired shape.
</dl>
<dl>
<dt>Device#close()
<dd>Tell the device that we are done, and flush any pending output.
</dl>
<h2>
Path
</h2>
<p>
A Path object represents vector graphics as drawn by a pen. A path can be either stroked or filled, or used as a clip mask.
<dl>
<dt>new Path()
<dd>Create a new empty path.
<dt>Path#moveTo(x, y)
<dd>Lift and move the pen to the coordinate.
<dt>Path#lineTo(x, y)
<dd>Draw a line to the coordinate.
<dt>Path#curveTo(x1, y1, x2, y2, x3, y3)
<dd>Draw a cubic bezier curve to (x3,y3) using (x1,y1) and (x2,y2) as control points.
<dt>Path#closePath()
<dd>Close the path by drawing a line to the last moveTo.
<dt>Path#rect(x1, y1, x2, y2)
<dd>Shorthand for moveTo, lineTo, lineTo, lineTo, closePath to draw a rectangle.
<dt>Path#walk(pathWalker)
<dd>Call moveTo, lineTo, curveTo and closePath methods on the pathWalker object to replay the path.
</dl>
<h2>
Text
</h2>
<p>
A Text object contains text.
<dl>
<dt>new Text()
<dd>Create a new empty text object.
<dt>Text#showGlyph(font, transform, glyph, unicode, wmode)
<dd>Add a glyph to the text object. Transform is the text matrix, specifying font size and glyph location. For example: <code>[size,0,0,-size,x,y]</code>.
Glyph and unicode may be -1 for n-to-m cluster mappings.
For example, the "fi" ligature would be added in two steps: first the glyph for the 'fi' ligature and the unicode value for 'f';
then glyph -1 and the unicode value for 'i'.
WMode is 0 for horizontal writing, and 1 for vertical writing.
<dt>Text#showString(font, transform, string)
<dd>Add a simple string to the text object. Will do font substitution if the font does not have all the unicode characters required.
<dt>Text#walk(textWalker)
<dd>Call the showGlyph method on the textWalker object for each glyph in the text object.
</dl>
<h2>
Font
</h2>
<p>
Font objects can be created from TrueType, OpenType, Type1 or CFF fonts.
In PDF there are also special Type3 fonts.
<dl>
<dt>new Font(fontName or fileName)
<dd>Create a new font, either using a built-in font name or a filename.
The built-in fonts are: Times-Roman, Times-Italic, Times-Bold, Times-BoldItalic,
Helvetica, Helvetica-Oblique, Helvetica-Bold, Helvetica-BoldOblique,
Courier, Courier-Oblique, Courier-Bold, Courier-BoldOblique,
Symbol, and ZapfDingbats.
<dt>Font#getName()
<dd>Get the font name.
<dt>Font#encodeCharacter(unicode)
<dd>Get the glyph index for a unicode character. Glyph zero (.notdef) is returned if the font does not have a glyph for the character.
<dt>Font#advanceGlyph(glyph, wmode)
<dd>Return advance width for a glyph in either horizontal or vertical writing mode.
</dl>
<h2>
Image
</h2>
<p>
Image objects are similar to Pixmaps, but can contain compressed data.
<dl>
<dt>new Image(pixmap or fileName)
<dd>Create a new image from a pixmap data, or load an image from a file.
<dt>Image#getWidth()
<dt>Image#getHeight()
<dd>Image size in pixels.
<dt>Image#getXResolution()
<dt>Image#getYResolution()
<dd>Image resolution in dots per inch.
<dt>Image#getColorSpace()
<dt>Image#toPixmap(scaledWidth, scaledHeight)
<dd>Create a pixmap from the image. The scaledWidth and scaledHeight arguments are optional,
but may be used to decode a down-scaled pixmap.
</dl>
<h2>
Document Writer
</h2>
<p>
Document writer objects are used to create new documents in several formats.
<dl>
<dt>new DocumentWriter(filename, format, options)
<dd>Create a new document writer to create a document with the specified format and output options.
If format is null it is inferred from the filename suffix. The options argument is a comma separated list
of flags and key-value pairs. See below for more details.
<dt>DocumentWriter#beginPage(mediabox)
<dd>Begin rendering a new page. Returns a Device that can be used to render the page graphics.
<dt>DocumentWriter#endPage(device)
<dd>Finish the page rendering.
The argument must be the same device object that was returned by the beginPage method.
<dt>DocumentWriter#close()
<dd>Finish the document and flush any pending output.
</dl>
<p>
The output formats and options supported are the same as in the
<a href="manual-mutool-convert.html">mutool convert</a> command.
<h2>
PDFDocument and PDFObject
</h2>
<p>
With MuPDF it is also possible to create, edit and manipulate PDF documents
using low level access to the objects and streams contained in a PDF file.
A PDFDocument object is also a Document object. You can test a Document object
to see if it is safe to use as a PDFDocument by calling document.isPDF().
<dl>
<dt>new PDFDocument()
<dd>Create a new empty PDF document.
<dt>new PDFDocument(fileName)
<dd>Load a PDF document from file.
<dt>PDFDocument#save(fileName, options)
<dd>Write the PDF document to file.
The write options are a string of comma separated options (see the document writer <a href="#pdf-write-options">options</a>).
</dl>
<h3>
PDF Object Access
</h3>
<p>
A PDF document contains objects, similar to those in JavaScript: arrays, dictionaries, strings, booleans, and numbers.
At the root of the PDF document is the trailer object; which contains pointers to the meta data dictionary and the
catalog object which contains the pages and other information.
<p>
Pointers in PDF are also called indirect references,
and are of the form "32 0 R" (where 32 is the object number, 0 is the generation, and R is magic syntax).
All functions in MuPDF dereference indirect references automatically.
<p>
PDF has two types of strings: /Names and (Strings). All dictionary keys are names.
<p>
Some dictionaries in PDF also have attached binary data. These are called streams, and may be compressed.
<dl>
<dt>PDFDocument#getTrailer()
<dd>The trailer dictionary. This contains indirect references to the Root and Info dictionaries.
<dt>PDFDocument#countObjects()
<dd>Return the number of objects in the PDF. Object number 0 is reserved, and may not be used for anything.
<dt>PDFDocument#createObject()
<dd>Allocate a new numbered object in the PDF, and return an indirect reference to it.
The object itself is uninitialized.
<dt>PDFDocument#deleteObject(obj)
<dd>Delete the object referred to by the indirect reference.
</dl>
<p>
PDFObjects are always bound to the document that created them.
Do NOT mix and match objects from one document with another document!
<dl>
<dt>PDFDocument#addObject(obj)
<dd>Add 'obj' to the PDF as a numbered object, and return an indirect reference to it.
<dt>PDFDocument#addStream(buffer, object)
<dd>Create a stream object with the contents of 'buffer', add it to the PDF, and return an indirect reference to it. If object is defined, it will be used as the stream object dictionary.
<dt>PDFDocument#addRawStream(buffer, object)
<dd>Create a stream object with the contents of 'buffer', add it to the PDF, and return an indirect reference to it.
If object is defined, it will be used as the stream object dictionary.
The buffer must contain already compressed data that matches the Filter and DecodeParms.
<dt>PDFDocument#newNull()
<dt>PDFDocument#newBoolean(boolean)
<dt>PDFDocument#newInteger(number)
<dt>PDFDocument#newReal(number)
<dt>PDFDocument#newString(string)
<dt>PDFDocument#newName(string)
<dt>PDFDocument#newIndirect(objectNumber, generation)
<dt>PDFDocument#newArray()
<dt>PDFDocument#newDictionary()
</dl>
<p>
The following functions can be used to copy objects from one document to another:
<dl>
<dt>PDFDocument#graftObject(object)
<dd>Deep copy an object into the destination document. This function will not remember previously
copied objects.
If you are copying several objects from the same source document using multiple calls, you should
use a graft map instead.
<dt>PDFDocument#newGraftMap()
<dd>Create a graft map for the source document, so that objects that have already been copied can be found again.
<dt>PDFGraftMap#graftObject(object)
<dd>Use the graft map to copy objects, with the ability to remember previously copied objects.
</dl>
<p>
All functions that take PDF objects, do automatic translation between JavaScript objects
and PDF objects using a few basic rules. Null, booleans, and numbers are translated directly.
JavaScript strings are translated to PDF names, unless they are surrounded by parentheses:
"Foo" becomes the PDF name /Foo and "(Foo)" becomes the PDF string (Foo).
<p>
Arrays and dictionaries are recursively translated to PDF arrays and dictionaries.
Be aware of cycles though! The translation does NOT cope with cyclic references!
<p>
The translation goes both ways: PDF dictionaries and arrays can be accessed similarly
to JavaScript objects and arrays by getting and setting their properties.
<dl>
<dt>PDFObject#get(key or index)
<dt>PDFObject#put(key or index, value)
<dt>PDFObject#delete(key or index)
<dd>Access dictionaries and arrays. Dictionaries and arrays can also be accessed using normal property syntax: obj.Foo = 42; delete obj.Foo; x = obj[5].
<dt>PDFObject#resolve()
<dd>If the object is an indirect reference, return the object it points to; otherwise return the object itself.
<dt>PDFObject#isArray()
<dt>PDFObject#isDictionary()
<dt>PDFObject#forEach(function(key,value){...})
<dd>Iterate over all the entries in a dictionary or array and call fun for each key-value pair.
<dt>PDFObject#length
<dd>Length of the array.
<dt>PDFObject#push(item)
<dd>Append item to the end of the array.
</dl>
<p>
The only way to access a stream is via an indirect object, since all streams
are numbered objects.
<dl>
<dt>PDFObject#isIndirect()
<dd>Is the object an indirect reference.
<dt>PDFObject#asIndirect()
<dd>Return the object number the indirect reference points to.
<dt>PDFObject#isStream()
<dd>True if the object is an indirect reference pointing to a stream.
<dt>PDFObject#readStream()
<dd>Read the contents of the stream object into a Buffer.
<dt>PDFObject#readRawStream()
<dd>Read the raw, uncompressed, contents of the stream object into a Buffer.
<dt>PDFObject#writeObject(obj)
<dd>Update the object the indirect reference points to.
<dt>PDFObject#writeStream(buffer)
<dd>Update the contents of the stream the indirect reference points to.
This will update the Length, Filter and DecodeParms automatically.
<dt>PDFObject#writeRawStream(buffer)
<dd>Update the contents of the stream the indirect reference points to.
The buffer must contain already compressed data that matches the Filter and DecodeParms.
This will update the Length automatically, but leave the Filter and DecodeParms untouched.
</dl>
<p>
Primitive PDF objects such as booleans, names, and numbers can usually be treated like JavaScript values.
When that is not sufficient use these functions:
<dl>
<dt>PDFObject#isNull()
<dd>Is the object the 'null' object?
<dt>PDFObject#isBoolean()
<dd>Is the object a boolean?
<dt>PDFObject#asBoolean()
<dd>Get the boolean primitive value.
<dt>PDFObject#isNumber()
<dd>Is the object a number?
<dt>PDFObject#asNumber()
<dd>Get the number primitive value.
<dt>PDFObject#isName()
<dd>Is the object a name?
<dt>PDFObject#asName()
<dd>Get the name as a string.
<dt>PDFObject#isString()
<dd>Is the object a string?
<dt>PDFObject#asString()
<dd>Convert a "text string" to a javascript unicode string.
<dt>PDFObject#asByteString()
<dd>Convert a string to an array of byte values.
</dl>
<h3>
PDF Page Access
</h3>
<p>
All page objects are structured into a page tree, which defines the order the pages appear in.
<dl>
<dt>PDFDocument#countPages()
<dd>Number of pages in the document.
<dt>PDFDocument#findPage(number)
<dd>Return the page object for a page number. The first page is number zero.
<dt>PDFDocument#deletePage(number)
<dd>Delete the numbered page.
<dt>PDFDocument#insertPage(at, page)
<dd>Insert the page object in the page tree at the location. If 'at' is -1, at the end of the document.
</dl>
<p>
Pages consist of a content stream, and a resource dictionary containing all of the fonts and images used.
<dl>
<dt>PDFDocument#addPage(mediabox, rotate, resources, contents)
<dd>Create a new page object. Note: this function does NOT add it to the page tree.
<dt>PDFDocument#addSimpleFont(font)
<dd>Create a PDF object from the Font object as a WinAnsiEncoding encoded simple font.
<dt>PDFDocument#addFont(font)
<dd>Create a PDF object from the Font object as an Identity-H encoded CID font.
<dt>PDFDocument#addImage(image)
<dd>Create a PDF object from the Image object.
</dl>
<h3>
PDF Annotations (WORK IN PROGRESS!)
</h3>
<dl>
<dt>PDFPage#createAnnotation(type)
<dd>Create a new blank annotation of a given type.
The type must be one of the annotation subtypes listed in the PDF reference.
<dt>PDFPage#deleteAnnotation(annot)
<dd>Delete the annotation from the page.
</dl>
<dl>
<dt>PDFAnnotation#getType()
<dd>Return the annotation subtype.
<dt>PDFAnnotation#getFlags(), #setFlags(flags)
<dd>Get/set the annotation flags.
<dt>PDFAnnotation#getContents(), #setContents(text)
<dt>PDFAnnotation#getRect(), #setRect(rect)
<dt>PDFAnnotation#getBorder(), #setBorder(width)
<dt>PDFAnnotation#getColor(), #setColor(color)
<dt>PDFAnnotation#getQuadPoints(), #setQuadPoints(quadPoints)
<dt>PDFAnnotation#getInkList(), #setInkList(inkList)
<dt>PDFAnnotation#updateAppearance()
<dd>Update the appearance stream to account for changes in the annotation.
</dl>
<h2>
TODO
</h2>
<p>
There are several areas in MuPDF that still need bindings to access from JavaScript:
<ul>
<li>Shadings
<li>PDFDocument#graftObject()
<li>PDFWriteDevice
<li>DocumentWriter
</ul>
</article>
<footer>
<a href="http://artifex.com"><img src="artifex-logo.png" align="right"></a>
Copyright © 2006-2017 Artifex Software Inc.
</footer>
</body>
</html>
|
