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Special glyphs slightly malformed / text slightly blurry with Atlas Engine and Meslo Nerd font #18526

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opened 2026-01-31 06:16:44 +00:00 by claunia · 3 comments
claunia commented 2026-01-31 06:16:44 +00:00
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Originally created by @itsTyrion on GitHub (Sep 22, 2022).

Originally assigned to: @lhecker on GitHub.

Windows Terminal version

1.16.2523.0

Windows build number

10.0.19044.0

Other Software

PARTIALLY affects MacType (better font AA) but I'm mainly reporting the malformed glyphs

Steps to reproduce

Use WT preview with Atlas Engine and Meslo Nerd Font
Just to make sure, the exact font files MesloLGS-NF.zip

Expected Behavior

No response

Actual Behavior

This is without Atlas Engine (MacType enabled)
2022-09-22_02-14
This is with Atlas Engine (MacType enabled). Less clear, shapes malformed.
image
With Atlas (MacType disabled, so only clarity/sharpness is slightly affected)
image

Without Atlas (MacType disabled, very visible in the Windows glyph. Just for reference)
image

Originally created by @itsTyrion on GitHub (Sep 22, 2022). Originally assigned to: @lhecker on GitHub. ### Windows Terminal version 1.16.2523.0 ### Windows build number 10.0.19044.0 ### Other Software PARTIALLY affects MacType (better font AA) but I'm mainly reporting the malformed glyphs ### Steps to reproduce Use WT preview with Atlas Engine and Meslo Nerd Font Just to make sure, the exact font files [MesloLGS-NF.zip](https://github.com/microsoft/terminal/files/9621188/MesloLGS-NF.zip) ### Expected Behavior _No response_ ### Actual Behavior This is without Atlas Engine (MacType enabled) ![2022-09-22_02-14](https://user-images.githubusercontent.com/17730120/191632157-858cf40a-c451-4195-843f-3f53b44f4f6c.png) This is with Atlas Engine (MacType enabled). Less clear, shapes malformed. ![image](https://user-images.githubusercontent.com/17730120/191632355-e395599a-9810-4b84-a92f-ecbaef127c3a.png) With Atlas (MacType disabled, so only clarity/sharpness is slightly affected) ![image](https://user-images.githubusercontent.com/17730120/191632479-d23886af-c484-4f8f-bf2d-617d9ce489a9.png) Without Atlas (MacType disabled, very visible in the Windows glyph. Just for reference) ![image](https://user-images.githubusercontent.com/17730120/191632431-4effcd83-b574-4714-88fb-490c6a62732e.png)
claunia commented 2026-01-31 06:16:47 +00:00
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@lhecker commented on GitHub (Sep 22, 2022):

FYI If you're curious about some of these changes, there's a lengthy discussion over here with the latest update being: https://github.com/microsoft/terminal/issues/13936#issuecomment-1254302780 In short, the blurriness appears to be correct actually/unfortunately.

In the soon to be released next 1.16 update you'll be able to specify precise fractional font sizes which will allow you to restore the previous look of glyphs. Text clarity can be improved if you enable ClearType in your settings. Finally, the reason those rounded corners look worse is because I'm incorrectly handling glyph sizes in AtlasEngine and assume that they're 1 cell wide, even though they're actually 2 cells wide. This is an issue that's specific to Nerd Fonts and is something I'm currently working on as fast as I can.

@lhecker commented on GitHub (Sep 22, 2022): FYI If you're curious about some of these changes, there's a lengthy discussion over here with the latest update being: https://github.com/microsoft/terminal/issues/13936#issuecomment-1254302780 In short, the blurriness appears to be correct actually/unfortunately. In the soon to be released next 1.16 update you'll be able to specify precise fractional font sizes which will allow you to restore the previous look of glyphs. Text clarity can be improved if you enable ClearType in your settings. Finally, the reason those rounded corners look worse is because I'm incorrectly handling glyph sizes in AtlasEngine and assume that they're 1 cell wide, even though they're actually 2 cells wide. This is an issue that's specific to Nerd Fonts and is something I'm currently working on as fast as I can.
claunia commented 2026-01-31 06:16:47 +00:00
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@itsTyrion commented on GitHub (Sep 23, 2022):

Good to know, thanks for the fast reply. I'll keep it disabled for the time being and use MacType. Especially the NF symbols (OS logo, folder, git..) look a lot better for the time being.
What I don't understand is why exactly some text gets blurry with Atlas AND MacType

@itsTyrion commented on GitHub (Sep 23, 2022): Good to know, thanks for the fast reply. I'll keep it disabled for the time being and use MacType. Especially the NF symbols (OS logo, folder, git..) look a lot better for the time being. What I don't understand is why exactly *some* text gets blurry with Atlas AND MacType
claunia commented 2026-01-31 06:16:47 +00:00
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@lhecker commented on GitHub (Sep 25, 2022):

FYI I'm going to continue tracking the issue with nerd font glyphs in #14022, which was the first issue to report it.

@lhecker commented on GitHub (Sep 25, 2022): FYI I'm going to continue tracking the issue with nerd font glyphs in #14022, which was the first issue to report it.
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Reference: starred/terminal#18526
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