[webkit-dev] Possible device scale factor emulation approaches?

[Alexander Pavlov]

Hello, WebKit folks,

I'm working on emulating the device scale factor with Web Inspector. My
goal is to let web developers see their pages on "normal" (device pixel
ratio == 1) monitors the way they would look on e.g. retina screens.
Page::setDeviceScaleFactor() is not something we can use, since it will
have the reverse effect when used by platform-specific compositor code
(which I saw on Chromium, and its compositor is far from being ready for
such abnormal treatment.)

I took the approach of instrumenting the WebCore/css and WebCore/page code
relying on the page->deviceScaleFactor() value. This worked pretty well,
and you can see the respective patch at
https://bugs.webkit.org/attachment.cgi?id=172046&action=prettypatch (
https://bugs.webkit.org/show_bug.cgi?id=100762), but now I'm wondering if
there are better ways to implement this without instrumenting lots of
page->deviceScaleFactor() call sites.

Comments, ideas, suggestions, please?

--
Regards,
    Alexander
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