2064316 - Some emojis are blurry

Status: RESOLVED FIXED

(Core :: Graphics: Text, defect)

Description

[Alexandru Trif, Desktop Test Engineering [:atrif] [PTO 31 Aug- 11 Sep, please ni? :mboldan]]

Attachment: Screenshot 2026-08-17 at 15.25.30(1).png

• Filled on request 2061411#c20

Found in

• 156.0a1 (2026-08-18)

Affected versions

• 156.0a1 (2026-08-18)
• 155.0b1
• 154.0.4
• 140.13.0esr

Tested platforms

• Affected platforms: Windows 11, macOS 14/26 aarch, Ubuntu 24

• Unaffected platforms: none

Steps to reproduce

1. Open https://bugzilla.mozilla.org/attachment.cgi?id=9623349

Expected result

• All emojis are displayed as expected.

Actual result

• The emojis from the second row are blurry.

Regression range

• On macOS with mozregression, the emojis are not blurry before bug 2044211. I am setting it as the regressor; please change it to bug 2061411 if needed.

Additional notes

• Screenshot link: https://drive.google.com/file/d/1Re0mjnbsa-jLyHnVtP4RGURvd6WWv10v/view (Firefox is on the left side)
• This is more visible on macOS than on other platforms.

Comment 1

[BugBot [:suhaib / :marco]]

:gw, since you are the author of the regressor, bug 2044211, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 2

[BugBot [:suhaib / :marco]]

Set release status flags based on info from the regressing bug 2044211

Comment 3

[Glenn Watson [:gw]]

Attachment: Bug 2064316 - Rasterize a scaled bitmap-strike glyph at its final size

Bug 2061411 routes a bitmap-strike run under a transform to the local-raster
fallback, which rasterized at scale 1.0 and left the shader to scale the image up.
Core Text and DirectWrite resample the strike at rasterization time, so a scaled
emoji lost its detail before the GPU saw it. Take the raster scale from the
transform instead. Screen raster space only: a local raster space carries its own.

The reference moves to local(3.0), with a notref at local(1.0) pinning the soft
rendering. Both bitmap tests drop to scale 1.0, since wrench emulates a device
pixel scale with a root scale transform that a reference cannot name.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/9ac8b3931eb8
https://hg.mozilla.org/integration/autoland/rev/7d21eb4ff771
Rasterize a scaled bitmap-strike glyph at its final size r=gfx-reviewers,lsalzman

Comment 5

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/7d21eb4ff771

Comment 6

[BugBot [:suhaib / :marco]]

The patch landed in nightly and beta is affected.
:gw, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
  • See https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift for documentation on how to request an uplift.
• If no, please set status-firefox155 to wontfix.

For more information, please visit BugBot documentation.