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?
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