#31209: View PDF in Tor browser is fuzzy
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Reporter: null | Owner: tbb-team
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Applications/Tor Browser | Version:
Severity: Normal | Resolution:
Keywords: ff60-esr | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by gk):
Replying to [comment:2 pospeselr]:
> The tldr for why this happens is that RFP spoofs your monitor's DPI and
as a result things which render to canvas and take the screen DPI into
account (google docs, js pdf renderers, etc) will have the wrong value and
so the contents of the canvas element's backing frame buffer will be
stretched or squished to the page content's logical size.
>
> So for example suppose you have a high DPI screen and a page has a
canvas element with logical dimensions of 100x100 but the web app would
normally take DPI into account and request the framebuffer be 200x200 to
match your monitor's physical dimensions. With RFP enabled, the page now
thinks the physical dimensions are the same as the logical dimensions and
request a 100x100 framebuffer, whose contents are now stretched to fit the
200x200 physical dimensions, resulting in blurriness.
Are we missing a "Is this a privileged context and thus no RFP"-check here
somewhere?
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31209#comment:4>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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