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TOPIC: The pdf reader does not preload next page

The pdf reader does not preload next page 5 years 8 months ago #737

  • ysh19841211
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I used Galaxy tab and tested some pdf from real magazines, and the reader does not seem to preload the next page. Therefore it felt slow when changing page. Is it possible to make the reader preload the next page?

The second question I encountered is that when on tablet, changing page on the reader requires a big swipe (long-distance swipe) in order to go to the next page. Is it possible to shorten the swiping distance?

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The pdf reader does not preload next page 5 years 8 months ago #738

  • radaee
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for preload cache:
not enable in pdfex package,
you may need realize preload cache by yourself.

shorten the distance of swaping:
set Global.fling_dis to smaller in Global.default_config().

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The pdf reader does not preload next page 5 years 8 months ago #747

  • support
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With our internal tests we saw slow rendering performances opening PDFs files with a lot of high res, not optimized images and pictures.

By the way actually, doing a performances comparison with other available rendering engine we with our PDFViewer has good performances.

Are the magazines you are writing about freely distributable? May you send us one of them? We would like to do some tests on it, maybe looking at others reader again.

To send us big files write a direct email with a download link (our mailboxes should accept 10mb attachments and no more). If you don't own web space and don't want to adopt a free transfer service as wetransfer, let me know: I'll ask collegue to open a temporary ftp area.

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The pdf reader does not preload next page 5 years 8 months ago #753

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here's a link for the sample pdf. The performance is worse on android tablet. many thanks.

www.dropbox.com/sh/w7618xw71x3bjdw/Qh8smlCqiN/ta.pdf

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The pdf reader does not preload next page 5 years 8 months ago #760

  • radaee
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this document used JPX encoding images.
the decoding for JPX costs much time and memory.
so this is slow.

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The pdf reader does not preload next page 5 years 7 months ago #771

  • thekono
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You can please elaborate more? Do you mean your PDFViewer does not support it yet and we should implement our own page read-ahead chache system? Or there is a parameter we can enable it? We also would love to see this feature available to PDFViewer SDK as it's essential to our app.

Thanks a lot.

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