Bug 285007 – [Win] view size shouldn't be affected by custom device scale factor

• Component: New Bugs
• Status: VERIFIED FIXED

[Fujii Hironori]

Reported by Playwright:

  [Bug]: Mobile Device Emulation not rendering sites to viewport size · Issue #33702 · microsoft/playwright
  https://github.com/microsoft/playwright/issues/33702

279794@main added a device scale factor for Windows port.

In a Win32 app in high DPI, native window size is scaled.
For example, 100x100 window (in normal DPI) becomes 150x150 in 150% display.

All dimensions and positions have to be converted between inside WebKit and a native Win32 window.
win32 coordinate system can be converted to WebKit coordinate system by division by the scale factor.
WebKit coordinate system can be converted to win32 coordinate system by multiplication by the scale factor.

However, a custom device scale factor is specified,
the custom device scale factor shouldn't be used for the conversion.
The conversion should be done by the intrinsic device scale factor.

[Fujii Hironori]

Created attachment 473612 [details]
WIP patch

[Fujii Hironori]

Pull request: https://github.com/WebKit/WebKit/pull/38356

[Radar WebKit Bug Importer]

<rdar://problem/142088306>

[EWS]

Committed 289251@main (b6d7f33139c7): <https://commits.webkit.org/289251@main>

Reviewed commits have been landed. Closing PR #38356 and removing active labels.

[Yury Semikhatsky]

Finally rolled this to Playwright and I can confirm that the customer's problem has been fixed.