1449929 - Selected text is overlapped for some fonts from https://www.axis-praxis.org variable fonts demo page

Status: NEW

(Core :: Layout: Text and Fonts, defect, P5)

Description

[roxleitan]

Attachment: select font.png

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180328220110

[Affected versions]:
Nightly 61.0a1

[Affected platforms]:
Windows 10 X64

[Steps to reproduce]:
1.Launch Nightly 61.0a1 with a new profile
2.Open https://www.axis-praxis.org/specimens/compressa
3.Set Font " Winner Regular" for "text-2" from the right corner (please see the attached screenshot)
4.Select all text from "text-2" area using the mouse

[Expected results]:
Selected text should be highlighted and well displayed (visible)

[Actual results]:
Selected text is highlighted but is overlapped

Comment 1

[Jonathan Kew [:jfkthame]]

I think this is a DirectWrite bug specifically affecting the Winner font. Trying the Winner sample on axis-praxis and moving the sliders around, you'll see that the positioning of the glyphs varies -- when they should just be changing weight or width, they actually move up/down as well so that they're placed far off the expected baseline.

This only occurs with the Winner font, only on Windows; and I see the same glyph-positioning issues with it in MS Edge; therefore, I conclude that it's a bug in DirectWrite's handling of the variation axes in that specific font.

Comment 2

[Jonathan Kew [:jfkthame]]

BTW, I've emailed a contact at Microsoft to enquire about this.

Comment 3

[Jonathan Kew [:jfkthame]]

My contact at Microsoft believes that the problem with DirectWrite's rendering here is actually the result of a font bug.