Register Guidelines E-Books Search Today's Posts Mark Forums Read

Go Back   MobileRead Forums > E-Book Readers > More E-Book Readers > iRex

Notices

Reply
 
Thread Tools Search this Thread
Old 04-09-2011, 06:17 AM   #1
bokjeid
Addict
bokjeid began at the beginning.
 
Posts: 217
Karma: 10
Join Date: May 2010
Device: DR1000S
PDF pre-fetching doesn't work on fullscreen mode

Hello,
Today I found out some strange problem regarding PDF on DR1000S.
When I use it on "fullscreen mode", there shows up a loading box every time I turn to the next page nevertheless I waited much time to let DR1000S pre-fetch the next pages.
But this problem doesn't appear on "not fullscreen mode" - in this case, DR1000S normally pre-fetchs the next pages.
So it hinders me in using DR1000S on "fullscreen mode" ;;

Why is it? How can I solve it?

Is there anybody who has similar experience?

If you want more detailed explanation, please tell me.
bokjeid is offline   Reply With Quote
Old 04-11-2011, 03:00 PM   #2
Mackx
Guru
Mackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to behold
 
Posts: 998
Karma: 19985
Join Date: Dec 2008
Location: Netherlands
Device: iRex DR1000S
Hi bokje,

I did some quick experiments, but did not see too much difference. Maybe rendering to the bigger 'full-screen' size is taking an un-proportional amount of extra cpu power?
The document I am reading now is rather simple, that might explain that I do not see any wait-dialogs. I also used a e-magazine, which gives both dialogs with normal and full-screen for most pages.

Unfortunately pre-caching is done by UDS of which no source code is published.
Mackx is offline   Reply With Quote
Old 04-11-2011, 05:45 PM   #3
Shaggy
Wizard
Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.Shaggy ought to be getting tired of karma fortunes by now.
 
Shaggy's Avatar
 
Posts: 4,293
Karma: 529619
Join Date: May 2007
Device: iRex iLiad, DR800SG
Quote:
Originally Posted by Mackx View Post
Hi bokje,

I did some quick experiments, but did not see too much difference. Maybe rendering to the bigger 'full-screen' size is taking an un-proportional amount of extra cpu power?
The document I am reading now is rather simple, that might explain that I do not see any wait-dialogs. I also used a e-magazine, which gives both dialogs with normal and full-screen for most pages.

Unfortunately pre-caching is done by UDS of which no source code is published.
I imagine a text-PDF vs an image-PDF would make a difference, as well as the resolution/etc if it's image based. The DR isn't terribly fast at scaling images.
Shaggy is offline   Reply With Quote
Old 04-11-2011, 06:28 PM   #4
rvs
Groupie
rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.
 
Posts: 181
Karma: 364
Join Date: Oct 2009
Device: DR1000s, Hanlin V5
I haven't seen any difference either, but you might try converting to djvu. This might shave off a few seconds on the page load time, which might be enough to get the prefetching working again.

I have a feeling that when the pages load too slow (perhaps somewhere between 10-15 seconds), the prefetching normally doesn't happen. I could be wrong though, I haven't tested this thoroughly.
rvs is offline   Reply With Quote
Old 04-12-2011, 07:50 AM   #5
bokjeid
Addict
bokjeid began at the beginning.
 
Posts: 217
Karma: 10
Join Date: May 2010
Device: DR1000S
Quote:
Originally Posted by Mackx View Post
Hi bokje,

I did some quick experiments, but did not see too much difference. Maybe rendering to the bigger 'full-screen' size is taking an un-proportional amount of extra cpu power?
The document I am reading now is rather simple, that might explain that I do not see any wait-dialogs. I also used a e-magazine, which gives both dialogs with normal and full-screen for most pages.

Unfortunately pre-caching is done by UDS of which no source code is published.
Hello Mackx,

You can check it with this test pdf file which I attached at my another thread in this forum some time ago.

http://www.mobileread.com/forums/att...3&d=1298962624

And, I agree with you. It seems that only 'full screen' mode takes some rendering time every page turning on some exact PDF files. In my case, most of my PDF files don't show this problem but only 2 PDF files did.
But I couldn't express it well so I just mentioned it as 'pre-fetching'..

Then, if it is a problem or bug of the 'full screen' mode itself, it means that we can't solve it as a user, not a developer?

So far, the only solution for this problem which I've found is 'to turn off full screen mode'..


Quote:
Originally Posted by Shaggy View Post
I imagine a text-PDF vs an image-PDF would make a difference, as well as the resolution/etc if it's image based. The DR isn't terribly fast at scaling images.
Hello Shaggy,
Yes, sometimes DR1000S shows phenomenal page turning speed on some text PDF files such as especially the DR1000S manual PDF inside. No loading time, nearly.
Maybe developers were satisfied with its PDF page turning speed as they test it with only that kind of PDF files.. Of course I don't know well..


Quote:
Originally Posted by rvs View Post
I haven't seen any difference either, but you might try converting to djvu. This might shave off a few seconds on the page load time, which might be enough to get the prefetching working again.

I have a feeling that when the pages load too slow (perhaps somewhere between 10-15 seconds), the prefetching normally doesn't happen. I could be wrong though, I haven't tested this thoroughly.
Hello rvs,
Yeah, I also assume that djvu converting would be one of the best options. So I've tried it many times as what I posted in one of my old threads.

But some issues of this method blocked me..
1) a clash with CBZ
2) we can't merge the scribbles with Xournal
3) it would take much time to convert all of dozens of PDF files..
4) the margin data of a PDF file was lost when converting to a djvu file - this was the most serious problem in my case

However, if you don't have to care of those in your case, it can be a good solution.


bokjeid is offline   Reply With Quote
Old 04-12-2011, 09:29 AM   #6
rvs
Groupie
rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.
 
Posts: 181
Karma: 364
Join Date: Oct 2009
Device: DR1000s, Hanlin V5
Hi bokjeid,

I checked your file and I get the same results as you (prefetching works on normal view, but not on full-screen). I have another pdf on my DR though where it happens both with normal and full-screen view, so the bug (if it is a bug and not a power-saving 'feature') is not limited to full-screen per se.
rvs is offline   Reply With Quote
Old 04-13-2011, 08:04 AM   #7
rvs
Groupie
rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.
 
Posts: 181
Karma: 364
Join Date: Oct 2009
Device: DR1000s, Hanlin V5
I think I might've found a somewhat workable workaround for this problem.

Before turning a page, hold the lower middle button (menu button) for 3/4 to 15 seconds. Now prefetching should work on the next page.

You don't have to do it right before you turn the page. The time needed depends on the book and if you do it right after you turn a page (this takes longer, so you still can't skip through a book very fast).

PS. Hold it for at least 3/4 seconds, otherwise the menu will show up.
rvs is offline   Reply With Quote
Old 04-15-2011, 09:04 AM   #8
bokjeid
Addict
bokjeid began at the beginning.
 
Posts: 217
Karma: 10
Join Date: May 2010
Device: DR1000S
Quote:
Originally Posted by rvs View Post
I think I might've found a somewhat workable workaround for this problem.

Before turning a page, hold the lower middle button (menu button) for 3/4 to 15 seconds. Now prefetching should work on the next page.

You don't have to do it right before you turn the page. The time needed depends on the book and if you do it right after you turn a page (this takes longer, so you still can't skip through a book very fast).

PS. Hold it for at least 3/4 seconds, otherwise the menu will show up.

Wow! Miracle!
I tested it yesterday and it really worked!!
And I'll test it at 2nd time tomorrow.
Is there anybody who tried it, too?
Thank you so much, rvs.
Do you know how and why it works?
I've really never seen this method anywhere until now.
bokjeid is offline   Reply With Quote
Old 04-15-2011, 09:46 AM   #9
Mackx
Guru
Mackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to behold
 
Posts: 998
Karma: 19985
Join Date: Dec 2008
Location: Netherlands
Device: iRex DR1000S
Quote:
Originally Posted by bokjeid View Post
Do you know how and why it works?
The key-press is waking-up the DR so it continues with its activities, which was pre-fetching/rendering the next page(s). It seems that when not in fullscreen the page can be rendered before idle-mode starts, and in full-screen mode not. If this helps then increasing the timeout for the idl-mode should also help with this problem. The timeout currently is 5s, but it is fixed in code.
What I find strange is that the pre-fetcher does not prevent the idle-mode from starting, there is a possibility to prevent this using a system-call. There could also be a bug in UDS, which only shows up when entering full-screen mode.
It is also strange that it is reproducable with a lot of documents. If it is really a matter of longer rendering time, I would expect it to go wrong only when rendering takes about 5s. Unless redering for full-screen takes a considerable extra amount of time. (Maybe, due to a bug, the page is first rendered to the non-fullscreen resolution and after that also to the full-screen resolution?)
Mackx is offline   Reply With Quote
Old 04-15-2011, 10:53 AM   #10
rvs
Groupie
rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.
 
Posts: 181
Karma: 364
Join Date: Oct 2009
Device: DR1000s, Hanlin V5
Quote:
Originally Posted by Mackx View Post
The key-press is waking-up the DR so it continues with its activities, which was pre-fetching/rendering the next page(s). It seems that when not in fullscreen the page can be rendered before idle-mode starts, and in full-screen mode not. If this helps then increasing the timeout for the idl-mode should also help with this problem. The timeout currently is 5s, but it is fixed in code.
I already tried this (setting it to 10s), but it didn't seem to do anything. I may have made a mistake somewhere though.
rvs is offline   Reply With Quote
Old 04-16-2011, 05:48 AM   #11
Mackx
Guru
Mackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to beholdMackx is a splendid one to behold
 
Posts: 998
Karma: 19985
Join Date: Dec 2008
Location: Netherlands
Device: iRex DR1000S
Quote:
Originally Posted by rvs View Post
I already tried this (setting it to 10s), but it didn't seem to do anything. I may have made a mistake somewhere though.
Maybe there is a time-out in UDS, allowing a pre-render of 5s and killing it when it does not finish within that time?
Mackx is offline   Reply With Quote
Old 04-16-2011, 06:44 AM   #12
bokjeid
Addict
bokjeid began at the beginning.
 
Posts: 217
Karma: 10
Join Date: May 2010
Device: DR1000S
Yes, it would be certainly 'one of bugs' of DR1000S that 'pre-rendering' doesn't work well on full screen mode on some PDF files. This problem makes the full screen mode unusable.
I tested it again today and thought that to keep pressing the middle button is a valid solution to this problem in most times but it is inconvenient to keep pressing the middle button every time turning page.
The best way for this would be to fix and eradicate the bug inside but it seems that there is no update or patch of the firmware any more from IRX, doesn't it? But users can fix it?
bokjeid is offline   Reply With Quote
Old 04-16-2011, 07:36 AM   #13
rvs
Groupie
rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.
 
Posts: 181
Karma: 364
Join Date: Oct 2009
Device: DR1000s, Hanlin V5
I think in principle it might be possible. I don't know if there'll be any adverse side-effects though (like noticeable increased power consumption) and I don't know how to implement it (yet).

Basically what you do when you press the button is create a wake up event, which is handled outside of UDS. So in that way it looks promising.
rvs is offline   Reply With Quote
Old 04-16-2011, 11:35 PM   #14
bokjeid
Addict
bokjeid began at the beginning.
 
Posts: 217
Karma: 10
Join Date: May 2010
Device: DR1000S
Quote:
Originally Posted by rvs View Post
I think in principle it might be possible. I don't know if there'll be any adverse side-effects though (like noticeable increased power consumption) and I don't know how to implement it (yet).

Basically what you do when you press the button is create a wake up event, which is handled outside of UDS. So in that way it looks promising.
I see.
Anyway, thank you for the very useful information.
bokjeid is offline   Reply With Quote
Old 04-18-2011, 03:57 PM   #15
rvs
Groupie
rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.rvs has a complete set of Star Wars action figures.
 
Posts: 181
Karma: 364
Join Date: Oct 2009
Device: DR1000s, Hanlin V5
Setting it to 10 seconds does seem to work. I think I made a mistake earlier when directing the output from the compiler.
rvs is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
how does amazon's free pre-order work? wyndslash Amazon Kindle 20 02-24-2011 02:13 AM
PDF Zoom Mode An Truong Ectaco jetBook 1 07-16-2010 03:02 PM
Pdf on DR800SG, landscape mode al35 iRex 1 02-23-2010 06:26 AM
Lire les pdf mode image Cleanthe Cybook 4 06-11-2008 02:54 PM
iLiad iRex Fullscreen mode iPDF realityloop iRex Developer's Corner 4 07-12-2007 09:52 AM


All times are GMT -4. The time now is 09:39 PM.


MobileRead.com is a privately owned, operated and funded community.