Open source LRF viewer

kovidgoyal · 09-22-2007, 09:13 PM

libprs500 0.4.1 has an open source cross-platform LRF viewer that supports hyphenation (for english) and uses real fonts instead of the SONY's limited three. Use it from the command line (for the moment) by

Code:

lrfviewer mybook.lrf

Note that this is an initial implementation and so its bound to be buggy. I've only tested it with LRF files generated by recent versions of libprs500. Also the current implementation is slow/memory intensive, so I doubt its suitable for use on handhelds. I will work on speeding it up when I get the time.

It doesn't support the DrawChar tag as yet (Used to make drop-caps) and the search functionality is not implemented.

JSWolf · 09-22-2007, 10:11 PM

Is it going to support full justification instead of left justification?

Bob Russell · 09-22-2007, 10:30 PM

Wonderful.... this provides a spark of hope for long term readability of the non-DRM'd BBeB files!

kovidgoyal · 09-22-2007, 11:04 PM

Quote:

Originally Posted by JSWolf

Is it going to support full justification instead of left justification?

Not sure what you mean by "full" justification. It already supports hyphenation.

JSWolf · 09-22-2007, 11:06 PM

Quote:

Originally Posted by kovidgoyal

Not sure what you mean by "full" justification. It already supports hyphenation.

The Sony Reader supports full justification but not hyphenation.

Full justification is where the right edge is not ragged. Like in most dead tree books.

RWood · 09-22-2007, 11:11 PM

This is a wonderful addition to libprs500. Karma is on its way.

kovidgoyal · 09-22-2007, 11:13 PM

Quote:

Originally Posted by JSWolf

The Sony Reader supports full justification but not hyphenation.

Full justification is where the right edge is not ragged. Like in most dead tree books.

That's achieved by hyphenation, so yes.

kovidgoyal · 09-22-2007, 11:13 PM

Quote:

Originally Posted by RWood

This is a wonderful addition to libprs500. Karma is on its way.

Thanks.

JSWolf · 09-22-2007, 11:34 PM

Quote:

Originally Posted by kovidgoyal

That's achieved by hyphenation, so yes.

Yes to full justification is going to be added to the viewer in some later version?

kovidgoyal · 09-22-2007, 11:43 PM

It's already there.

JSWolf · 09-22-2007, 11:53 PM

If you look at the photo I have attached, what you will see is left justified, not full justified.

kovidgoyal · 09-23-2007, 12:06 AM

Ahh I see, you mean adjusting the space between words so that the line ends at the same point. Yeah I can do that, but I'm not sure it's a desirable goal. The SONY reader does it and I think it looks worse. Of course, with hyphenation it doesn't look as bad since the adjustments to wordspacing are typically smaller.

JSWolf · 09-23-2007, 12:10 AM

If Sony supported Hyphenation, then the word spacing would almost be the same on every line. You might have the odd line here or there where auto-hyphenation won't work, but it would look better overall. The best way to do hyphenation is to use a dictionary to lookup the words.

kovidgoyal · 09-23-2007, 12:21 AM

My viewer does precisely that. It uses the Liang hyphenation algorithm, which is the same as that used in Tex. However to achieve perfect justification you have to combine that with flexible word spacing, which works well in books that have small print, but I don't think it looks so good at the larger sizes at which electronic documents are typically viewed.

JSWolf · 09-23-2007, 12:24 AM

Well to be honest, other then the hyphenation, it looks like we are viewing on a simulated Libre. I do think full justification would look fine. I get it justified using MS Reader on my computer and I have no complaints that it's not left justified.

09-22-2007, 09:13 PM	#1
kovidgoyal creator of calibre Posts: 44,566 Karma: 24495948 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Open source LRF viewer libprs500 0.4.1 has an open source cross-platform LRF viewer that supports hyphenation (for english) and uses real fonts instead of the SONY's limited three. Use it from the command line (for the moment) by Code: lrfviewer mybook.lrf Note that this is an initial implementation and so its bound to be buggy. I've only tested it with LRF files generated by recent versions of libprs500. Also the current implementation is slow/memory intensive, so I doubt its suitable for use on handhelds. I will work on speeding it up when I get the time. It doesn't support the DrawChar tag as yet (Used to make drop-caps) and the search functionality is not implemented. Attached Thumbnails

09-22-2007, 11:53 PM	#11
JSWolf Resident Curmudgeon Posts: 76,509 Karma: 136564766 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	If you look at the photo I have attached, what you will see is left justified, not full justified. Attached Thumbnails

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09-22-2007, 10:11 PM	#2
JSWolf Resident Curmudgeon Posts: 76,509 Karma: 136564766 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Is it going to support full justification instead of left justification?

09-22-2007, 10:30 PM	#3
Bob Russell Recovering Gadget Addict Posts: 5,381 Karma: 676161 Join Date: May 2004 Location: Pittsburgh, PA Device: iPad	Wonderful.... this provides a spark of hope for long term readability of the non-DRM'd BBeB files!

09-22-2007, 11:11 PM	#6
RWood Technogeezer Posts: 7,233 Karma: 1601464 Join Date: Nov 2006 Location: Virginia, USA Device: Sony PRS-500	This is a wonderful addition to libprs500. Karma is on its way.

09-22-2007, 11:43 PM	#10
kovidgoyal creator of calibre Posts: 44,566 Karma: 24495948 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It's already there.

09-23-2007, 12:06 AM	#12
kovidgoyal creator of calibre Posts: 44,566 Karma: 24495948 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Ahh I see, you mean adjusting the space between words so that the line ends at the same point. Yeah I can do that, but I'm not sure it's a desirable goal. The SONY reader does it and I think it looks worse. Of course, with hyphenation it doesn't look as bad since the adjustments to wordspacing are typically smaller.

09-23-2007, 12:10 AM	#13
JSWolf Resident Curmudgeon Posts: 76,509 Karma: 136564766 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	If Sony supported Hyphenation, then the word spacing would almost be the same on every line. You might have the odd line here or there where auto-hyphenation won't work, but it would look better overall. The best way to do hyphenation is to use a dictionary to lookup the words.

09-23-2007, 12:21 AM	#14
kovidgoyal creator of calibre Posts: 44,566 Karma: 24495948 Join Date: Oct 2006 Location: Mumbai, India Device: Various	My viewer does precisely that. It uses the Liang hyphenation algorithm, which is the same as that used in Tex. However to achieve perfect justification you have to combine that with flexible word spacing, which works well in books that have small print, but I don't think it looks so good at the larger sizes at which electronic documents are typically viewed.

09-23-2007, 12:24 AM	#15
JSWolf Resident Curmudgeon Posts: 76,509 Karma: 136564766 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Well to be honest, other then the hyphenation, it looks like we are viewing on a simulated Libre. I do think full justification would look fine. I get it justified using MS Reader on my computer and I have no complaints that it's not left justified.

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