Compiled font from repository is blurrier than downloaded font
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Description
I want to compile Fira Code to enable several style options permanently, since pyftfeatfreeze doesn't seem to support ligatures. Before I enabled them in FiraCode.glyphs I first tested a clean compilation with git clone + make (no changes to the code).
The fonts are correctly created in distr/ttf, but when I use my created fonts, hinting seems bad (above red line downloaded version, below my compiled version):

Zoom (see = and _):

Between each test I only replace one ttf with the other, no changes to the fontconfig configuration are done.
Also sizes are very different: 376kB vs 296kB for FiraCode-Regular.ttf, for example, and the Retina version is not built.
I can't see any errors: https://pastebin.com/W6ER9nvN
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the clean build with git clone and make, then compare the generated files in distr/ttf with the downloaded fonts. Start with FiraCode.glyphs and the build output, including the linked log, and determine why hinting, file sizes, and the missing Retina build differ; done means the generated variants match the expected build behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- git
- Domain
- build-system
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100