[Coco] Pdf on coco3

[Mathieu Bouchard]

Sorry... but actually, scanned pdf files such as those of the Rainbow magazine 
are a special case, they're just sets of full-page JPEG files plus page 
numbering (some scanned pdfs also contain the ASCII version using optical 
recognition, but that's invisible until you select some text). A viewer for just 
the images could limit itself to displaying the JPEG files that are in a PDF 
container. The issues with displaying those files are pretty different from 
those with displaying vector graphics and fonts, though in the end it's all 
about pixel sizes, aliasing and stuff.

The easiest solution for you could be to auto-export each page of a magazine to 
JPEG format and try to read that on the Coco, if there is a JPEG viewer. But 
quantizing it and encoding as GIF might be more efficient for Coco.


Le 2017-03-22 à 11:19:00, Mathieu Bouchard a écrit :

> EPUB is based on HTML (XHTML actually), so it wouldn't be any harder than 
> writing a simple web browser, either in graphics mode, or in text mode. Unix 
> has several examples of text-mode browser (for VT100 terminals, though often 
> not caring about colours) : Lynx, Links and more recently W3M. Unix also has 
> at least one mail client that can display HTML in a similar text-mode way : 
> Alpine (which is still my default mail client today).
>
> When supporting EPUB, it should be fairly easy to drop HTML or CSS codes that 
> you don't want to support (either because you're in text mode or because your 
> graphics mode font display doesn't support everything).
>
> In PDF, it's harder to get away with that, because it contains hardcoded 
> positions for text, so, you can't just pick a different font size and expect 
> it to fit in the page or look good. It's not as low level as CGP-115 or LOGO 
> drawing commands, but it's not meant to deviate from what it is exactly meant 
> to display. It's not even meant for low-res displays, Postscript was 
> originally designed to be efficient on printers that could do several 
> thousands of pixels per row but had cables way too low-speed for transmitting 
> bitmaps, and then PDF is the successor of PS. So, expect irregular spacing 
> between characters as you reduce resolution or zoom out... I can still notice 
> it sometimes with modern displays (e.g. 1920 pixels wide).
>
> (Though PDF is a binary format and Postscript isn't, they otherwise have lots 
> in common, though not nearly as much as between EPUB and a web page)
>
>
> Le 2017-03-22 à 10:55:00, Rietveld Rietveld a écrit :
>
>> I have my entire collection of Rainbow magazine PDFS on my SDC. I thought 
>> it would be nice to be able to view them with the coco‎ instead of my PC
>> 
>> Sent from my BlackBerry 10 smartphone.
>>  Original Message
>> From: Bill Nobel
>> Sent: Wednesday, March 22, 2017 1:55 AM
>> To: CoCoList for Color Computer Enthusiasts
>> Reply To: CoCoList for Color Computer Enthusiasts
>> Subject: Re: [Coco] Pdf on coco3
>> 
>> 
>> There are many pdf’s and a couple of epub’s is there something specific you 
>> are after?
>> 
>> Bill Nobel
>> b_nobel at hotmail.com<mailto:b_nobel at hotmail.com>
>> 
>> 
>> 
>> On Mar 21, 2017, at 7:51 PM, Rietveld Rietveld 
>> <rietveldh at hotmail.com<mailto:rietveldh at hotmail.com>> wrote:
>> 
>> Hi. Is there a Pdf or epub reader for the coco3
>> 
>> Sent from my BlackBerry 10 smartphone.
>> 
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> ______________________________________________________________________
> | Mathieu BOUCHARD --- tél: 514.623.3801, 514.383.3801 --- Montréal, QC
>

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| Mathieu BOUCHARD --- tél: 514.623.3801, 514.383.3801 --- Montréal, QC