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43 lines
2.1 KiB
Markdown
43 lines
2.1 KiB
Markdown
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# PostScript font resolution
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PSD text may identify a face by its PostScript name as well as a family/style.
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The PostScript prefix need not match the family name, and the family stored with
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a run can be a guess made from that name.
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## Resolution
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`FontDb::resolve_postscript` first looks for an installed face with that exact
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PostScript name (families that share the guessed prefix are read first), then
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falls back to a heuristic split of the name. The heuristic splits at the last
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hyphen. A name without a hyphen loses a trailing capitalised style word
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(`GmarketSansBold` → Gmarket Sans, 700; `ExampleSansSemiBoldItalic` → Example
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Sans, 600, italic). A lowercase ending is not a style (`Daylight`), and a style
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word after the vendor tag `MT` stays in the family (`ArialRoundedMTBold` →
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Arial Rounded MT Bold).
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The heuristic also gives the family, weight and slant stored on PSD import when
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the exact face is absent. A legacy family whose name ends in a style word and
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has no `MT` tag before it (`CooperBlack`) is then stored as the shorter family
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(Cooper, 900) until the face is installed.
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## Missing fonts
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Opening a PSD or Affinity file already replaces a run's guessed family with the
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installed family its PostScript name resolves to. A guess still stays on a run
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when the face was absent at import and the document is reopened from `.pcraft`
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after the font is installed, when fonts are registered after opening, or when a
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command sets `font` and `postscriptName` together.
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Missing-font detection (`missing_fonts` and `missing_fonts_in_layer`) and Replace
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Missing Fonts therefore use the same decision as layout: a run is missing only
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when neither its stored family, its exact PostScript face nor the heuristic
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family is installed. A run that resolves is not replaced because an unresolved
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run shares its family label.
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## Cost
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Detection resolves the PostScript name only for runs whose stored family is not
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installed. The first such lookup reads the name tables of installed faces; the
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result is cached until fonts are registered or system fonts are loaded, and
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layout performs the same lookup for those runs.
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