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Old 10-29-2006, 01:17 AM   #1
reh_reh
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over 2 mins to render PDF page

Hello everyone.

I've greatly enjoyed my Iliad. It's a convenience to be able to read most of my medical articles, and my fiction books on the device.

Today, I was reading a PDF file, where a page took over 2 minutes to render. Is this an error with the PDF viewer? The page is not very graphic-intensive. I've attached the file for your perusal- page number 4 is the one in question.

On a side note, I've been following Scotty's many contributions with keen interest. It's fun to watch someone good at their craft at work.
Attached Files
File Type: pdf pancreatic cystic resection.pdf (774.6 KB, 680 views)
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Old 10-29-2006, 06:48 AM   #2
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Glad I've been able to share some fun with you.

Your document looks all sweet and innocent but inside it is quite the complex beastie. Page 4 has one chunk of 69356 bytes of postscript drawing directives, no images in that mind you, just put text here, draw line there.
Page 5 has one chunk with 120885 bytes! Again, no image data, just pure draw text, draw line, fill box..

In addition page 4 also has a couple images, some Adobe Illustrator CS2 generated EPS metadata, complete with thumbnail images(!), and uses 10 fonts, all of them embedded. Example: GBACLG+MathematicalPi-Four, GBABFF+StoneSans-Semibold and GBACMD+TimesNewRomanPS-BoldItalic.

These are technically known as "complex pages".

I'm personally impressed that poppler managed them in 2 minutes.

Each embedded font requires building the text glyphs by hand from scratch based on drawing directives for each character. Poppler would like to cache all of that hard work away for re-use but the document is so typographically rich with various fonts I'm sure the glyph cache is overwhelmed causing poppler to have to keep drawing and re-drawing the various font glyphs.

The rich collection of super-scripted attributions are kicking poppler in the ribs when it's already on the floor rolling around. The document is using a highly shrunk font to do the super-scripts without adjusting the line height.

Even my Mac struggled mightily to render the document when I opened it and it has 4GB of RAM and two dual core CPU chips.

As far as I can tell the only PDF feature they didn't use were page thumbnails.

With a document this complex the only thing you can do to speed it up on an iLiad class device is to in essence "print" the pages to bitmaps which would drastically reduce the workload for the iLiad since it need only decode the bitmap for each page and throw it up on the screen.
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Old 10-29-2006, 01:07 PM   #3
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Thanks Scotty for the quick response.
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Old 10-29-2006, 04:03 PM   #4
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Quote:
Originally Posted by scotty1024
Even my Mac struggled mightily to render the document when I opened it and it has 4GB of RAM and two dual core CPU chips.
My crummy Celeron 2.8 GHz and 500 Mb took only a couple seconds to open the file in Foxit Reader 2.0.

Probably you used Acrobat to open the file....
I stopped using Acrobat almost altogether;
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Old 10-29-2006, 06:52 PM   #5
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No, I used Preview but it goes ahead and renders all the pages for you. Normally its blink and every page in the entire file is available but this one I could count a couple Mississippi's.

I have a PDF rasterizer tool for the Librie, might be time to tweak it for the iLiad.
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Old 11-10-2006, 12:43 PM   #6
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Quote:
Originally Posted by vranghel
I stopped using Acrobat almost altogether;
Me too, I am practically not using Acrobat. But with this file I was surprised: Acrobat works with it without any visible delays
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Old 11-11-2006, 07:57 AM   #7
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Adobe really boosted performance of their tools in the 7.0 series.

It really is a case of "Have you tried Acrobat recently?"

Poppler's rendering times haven't exactly been impressing me. Even on simple pages where it has but a single font and only text to render it finds a way to spend 2.6 seconds creating the bitmap.
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