linebender/vello

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A GPU compute-centric 2D renderer.

Stars: 4.3k
Forks: 300
Open beginner issues: 0
Indexed issues: 116
Avg merge: 2d 13h
Merged PRs (30d): 61

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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116 open issues indexed

API: Remove backend from GlyphRunBuilder? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1931 · 4 comments · Opened Sep 18, 2026
[Sparse Strips] Consider exposing non-stateful rendering into scene? Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

linebender/vello#1857 · 2 comments · Opened Aug 30, 2026
Add a non-AA mode Open

Difficulty 3/5 1-2 days Newbie friendliness 67/100

linebender/vello#1832 · 16 comments · Opened Aug 18, 2026
Device lost on Mali (Pixel 9) for any scene containing a path Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

linebender/vello#1816 · Opened Aug 13, 2026
repeatedly rendering the same `ImageData` does not occur any error but the image does not appear except the first rendering Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

linebender/vello#1809 · 2 reactions · Opened Aug 10, 2026
vello_cpu: Bring your own thread-pool Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

linebender/vello#1798 · 1 comment · 2 reactions · Opened Aug 5, 2026
`with_winit` example panics when resizing on linux Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

linebender/vello#1793 · 3 comments · Opened Aug 3, 2026
Feature request: offset/region support in RenderParams for atlas-style rendering Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

linebender/vello#1789 · Opened Aug 1, 2026
Zooming in on one of the demo scenes causes infinite loop (os x & linux) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

linebender/vello#1752 · 1 reaction · Opened Jul 16, 2026
shakes slightly Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

linebender/vello#1729 · Opened Jul 7, 2026
Feature Request: Path-Aligned Gradient Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1713 · 3 comments · Opened Jun 22, 2026
Support rendering meshes with per-vertex color Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

linebender/vello#1709 · 2 comments · Opened Jun 15, 2026
Render the Freya logo Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

linebender/vello#1704 · 1 comment · 1 reaction · Opened Jun 10, 2026
Support CSS `filter()` effects Open

C-sparse-strips enhancement

Difficulty 4/5 3-5 days Newbie friendliness 55/100

linebender/vello#1695 · Opened Jun 3, 2026
text fuzzy on dark background Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

linebender/vello#1694 · 4 comments · 1 reaction · Opened Jun 3, 2026
Fast specialized CPU glyph rasterization Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

linebender/vello#1692 · 2 comments · 2 reactions · Opened Jun 1, 2026
glifo: rolling on the floor laughing emoji rendered position Open

C-sparse-strips

Difficulty 3/5 1-2 days Newbie friendliness 48/100

linebender/vello#1685 · 3 comments · Opened May 29, 2026
Expose encoder-owned texture rendering API without internal queue submit Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

linebender/vello#1667 · 2 comments · Opened May 24, 2026
Vello GPU not rendering when window gets to a certain size Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

linebender/vello#1660 · 6 comments · Opened May 21, 2026
A LINETO fast path in flatten.wgsl for straight-segment-heavy workloads? Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

linebender/vello#1633 · 2 comments · Opened May 9, 2026
vello_hybrid: Extend calculation for images is wrong Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

linebender/vello#1590 · Opened Apr 20, 2026
Incorrect edge pixel rendering at some places Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

linebender/vello#1556 · 4 comments · Opened Apr 3, 2026
Performance issue with rendering large images using Vello Classic Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

linebender/vello#1545 · 13 comments · Opened Mar 27, 2026
Tracking issue: Features for Blitz Open

I-Blitz

Difficulty 5/5 Over a week Newbie friendliness 20/100

linebender/vello#1491 · 2 reactions · Opened Mar 5, 2026
Rendering bug when stroking rect on window boundary Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

linebender/vello#1483 · Opened Feb 25, 2026
with_wininit example crashes on Mali-TKRX v1.r49p Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

linebender/vello#1465 · Opened Feb 21, 2026
Add tests that render to a non-RGBA8 surface Open

C-sparse-strips

Difficulty 3/5 1-2 days Newbie friendliness 48/100

linebender/vello#1452 · Opened Feb 18, 2026
[sparse] zero length path with round cap not SVG spec compliant Open

C-sparse-strips

Difficulty 3/5 1-2 days Newbie friendliness 45/100

linebender/vello#1450 · 1 comment · Opened Feb 18, 2026
[Suggestion] Expose internal command buffer? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

linebender/vello#1430 · 4 comments · Opened Feb 10, 2026
Bunnymark performance Open

C-sparse-strips performance

Difficulty 4/5 3-5 days Newbie friendliness 45/100

linebender/vello#1427 · 2 comments · 1 reaction · Opened Feb 6, 2026
vello_common: Flood filter implementation maybe not entirely correct Open

C-sparse-strips

Difficulty 4/5 3-5 days Newbie friendliness 35/100

linebender/vello#1423 · 1 comment · Opened Feb 5, 2026
Eliminate `vello_common` dependency from `glifo` Open

dependencies

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1719 · 7 comments · Opened Feb 5, 2026
vello_hybrid: Incorrect early on on `!self.paint_visible` Open

bug C-gpu

Difficulty 3/5 1-2 days Newbie friendliness 45/100

linebender/vello#1408 · Opened Feb 2, 2026
[Hybrid] Hang when rendering https://www.wikipedia.org Open

bug C-gpu

Difficulty 4/5 3-5 days Newbie friendliness 35/100

linebender/vello#1405 · 3 comments · Opened Feb 2, 2026
Don't clear atlas regions in `vello_hybrid` Open

C-gpu performance

Difficulty 3/5 1-2 days Newbie friendliness 45/100

linebender/vello#1402 · 2 reactions · Opened Feb 2, 2026
[Hybrid] Crash with (too many) large images? Open

bug C-gpu

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1381 · Opened Jan 27, 2026
[Hybrid] Slow rendering of https://old.reddit.com/r/rust Open

bug C-gpu performance

Difficulty 4/5 3-5 days Newbie friendliness 38/100

linebender/vello#1380 · 21 comments · Opened Jan 26, 2026
Allow images with different channel counts Open

C-sparse-strips

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1378 · 1 comment · Opened Jan 25, 2026
Consider support for "inverse" blurred rounded rectangles Open

C-cpu C-research

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1374 · Opened Jan 22, 2026
sparse_strips: render to a `Pixmap` with borrowed data Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

linebender/vello#1367 · 3 comments · Opened Jan 20, 2026
Improve CI performance Open

testing

Difficulty 4/5 3-5 days Newbie friendliness 35/100

linebender/vello#1357 · 4 comments · Opened Jan 13, 2026
vello equivalent to vello_cpu's `push_clip_path` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1345 · 4 comments · Opened Jan 8, 2026
Why the flatten stage process the data in the local space? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

linebender/vello#1326 · Opened Dec 16, 2025
Implement remaining SVG filter primitives/CSS filter functions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

linebender/vello#1296 · 3 comments · 1 reaction · Opened Nov 17, 2025
Image quality degrades significantly when downscaling by >2× Open

C-cpu C-gpu C-sparse-strips

Difficulty 5/5 Over a week Newbie friendliness 35/100

linebender/vello#1289 · 4 comments · Opened Nov 13, 2025
Large cubic causes crash during flattening Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

linebender/vello#1277 · Opened Oct 15, 2025
`vello` should disable the `wgpu` gles backend by default Open

C-research

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

linebender/vello#1275 · 1 comment · Opened Oct 12, 2025
Prohibit zero-sized pixmaps Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

linebender/vello#1269 · 1 comment · Opened Oct 6, 2025
(Un)packing code makes assumptions about struct sizes Open

C-research

Difficulty 3/5 1-2 days Newbie friendliness 35/100

linebender/vello#1259 · 1 reaction · Opened Oct 2, 2025
Use pixel diffs in Vello Tests Open

C-research help wanted

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

linebender/vello#1254 · Opened Sep 29, 2025

linebender/vello

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