1510378 - gfx.webrender.debug.slow-frame-indicator is not show in maximized window

Status: NEW

(Core :: Graphics: WebRender, defect, P3)

Description

[Chris Peterson [:cpeterson]]

If I enable gfx.webrender.all and and gfx.webrender.debug.slow-frame-indicator = true, I see the slow frame indicator in non-maximized, screen-height windows, and fullscreen but not in maximized windows. I'm using Windows 10.

Comment 1

[Kartikaya Gupta (email:[e-mail])]

For me, if I maximize the window, I just see the bottom row of pixels from the indicator. It's way up at the top of the window so it's barely visible. Likely a positioning issue or something.

Comment 2

[Sotaro Ikeda [:sotaro]]

When window is maximized, position of ui seemed to be adjusted by nsNativeThemeWin::GetWidgetPadding().
GetWidgetPadding() has the following comment.

// XXX Maximized windows have an offscreen offset equal to
// the border padding. This should be addressed in nsWindow,
// but currently can't be, see UpdateNonClientMargins.

https://searchfox.org/mozilla-central/source/widget/windows/nsNativeThemeWin.cpp#2080