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Message from discussion Printing in 600 dpi
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fantasai  
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 More options Jun 28 2012, 2:16 am
Newsgroups: mozilla.dev.tech.layout
From: fantasai <fantasai.li...@inkedblade.net>
Date: Wed, 27 Jun 2012 23:16:30 -0700
Local: Thurs, Jun 28 2012 2:16 am
Subject: Re: Printing in 600 dpi
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On 06/27/2012 08:21 AM, Ben Bucksch wrote:

> I am unclear about gecko's dpi handling while printing.

> I need to have the webpage rendered with 600 dpi, i.e. an image with 600 pixels width should print with 1 inch width.
> Currently, the engines assumes web-like 100 dpi and prints in 6 inches.
> In my case, it's not a static <img>, but about a <div> that's built by JS. When the JS on the webpage asks about the size of
> the <div> in px, it must get 3000px as answer, but the <div> must print in say 21cm, printing these 3000px in these 21cm width.

> pref("layout.css.dpi", 600); (I'm in XULRunner) sounds like what I need, but it doesn't help.
> I tried <container style="width: 20cm"><div style="3000px">...</div></container>, but that doesn't work, it causes overflow.
> Also, printSettings.shrinkToFit = true; and printFrame.markupDocumentViewer.fullZoom = 10; don't help.

> I lack background knowledge about the layout engine to know how to approach this problem. Can somebody please point me in the
> right direction?

In CSS, the ratio of px to cm is fixed, so for a 600px image you want printed at 600dpi,
size your image as 1in, rather than as 600px, and it should print properly.

~fantasai


 
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