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metrics (#8738)
Follow-up to #8720 adding
* Two improvements to FreeType glyph measurements:
- Ensuring that glyphs are measured with the same hinting as they are
rendered, ref
[#8720#issuecomment-3305408157](https://github.com/ghostty-org/ghostty/pull/8720#issuecomment-3305408157);
- For outline glyphs, using the outline bbox instead of the built-in
metrics, like `renderGlyph()`.
* Basic unit tests for face metrics and their estimators, using the
narrowest and widest fonts from the resource directory, Cozette Vector
and Geist Mono.
---
I also made one unrelated change to `freetype.zig`, replacing
`@alignCast(@ptrCast(...))` with `@ptrCast(@alignCast(...))` on line
173. Autoformatting has been making this change on every save for weeks,
and reverting the hunk before each commit is getting old, so I hope it's
OK that I use this PR to upstream this decree from the formatter.
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Before we had a bad day if we tried to get the metrics of a bitmap font,
which would happen if we ever used one as fallback because we started
doing it for all fonts when we added fallback font scaling. This is a
pretty easy fix and finally allows users to configure true bitmap fonts
as their primary font as long as FreeType/CoreText can handle it.
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Move size adjustment logic out of `Entry`, I understand the impulse to
put it there but it results in passing a lot of stuff around which isn't
great.
Rework `add(...)` in to `add(...)` and `addDeferred(...)`, faces are
passed directly now instead of passing an entry, and an options struct
is used instead of positional arguments for things like style, fallback,
and size adjustment.
Change size adjustment test back to a half pixel tolerance instead of 5%
because the previous commit (allowing fractional pixel sizes) fixed the
root cause of large differences.
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A variety of naming, commenting, and formatting improvements + a few
explicit error sets. This commit has no functional changes, though it
does remove a couple functions that didn't really need to exist.
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Icons were often WAY too big before because they were filling the whole
cell in height, which isn't great lol. This commit adds an `icon_height`
metric which is used to constrain glyphs that shouldn't be the size of
the entire cell.
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Previously produced very wrong values when calling Collection.setSize,
since it was assuming that the provided face had the same point size as
the primary face, which isn't true during resize-- so instead we just
have faces keep track of their set size, this is generally useful.
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This better harmonizes fallback fonts with the primary font by matching
the heights of lowercase letters. This should be a big improvement for
users who use mixed scripts and so rely heavily on fallback fonts.
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This commit changes a LOT of areas of the code to use decl literals
instead of redundantly referring to the type.
These changes were mostly driven by some regex searches and then manual
adjustment on a case-by-case basis.
I almost certainly missed quite a few places where decl literals could
be used, but this is a good first step in converting things, and other
instances can be addressed when they're discovered.
I tested GLFW+Metal and building the framework on macOS and tested a GTK
build on Linux, so I'm 99% sure I didn't introduce any syntax errors or
other problems with this. (fingers crossed)
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For details see comments and FreeType docs @
https://freetype.org/freetype2/docs/reference/ft2-library_setup.html#ft_library
https://freetype.org/freetype2/docs/reference/ft2-face_creation.html#ft_face
tl;dr: FT_New_Face and FT_Done_Face require the Library to be locked for
thread safety, and FT_Load_Glyph and FT_Render_Glyph and friends need
the face to be locked for thread safety, since we're sharing faces
across threads.
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This sets the stage for dynamically adjusting the sizes of fallback
fonts based on the primary font's face metrics. It also removes a lot of
unnecessary work when loading fallback fonts, since we only actually use
the metrics based on the parimary font.
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in preparation to move ownership of metrics from faces to collections
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This is an attempt to use `void` as type for Freetype Load Flags when
backend does not use these flags.
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This continues our work to improve the amount of explicit error sets
we use in the codebase. Explicit error sets make it easier to understand
possible failure scenarios, allow us to use exhaustive matching, create
compiler errors if errors are unexpectedly added or removed, etc.
The goal eventually is 100% coverage but we're not even close yet.
This just moves us a little closer.
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Fixes #2364
This adds the bold, italic, and bold italic variants of JB Mono so it is
built-in. This also fixes up the naming convention for the embedded font
files across tests and removes redundant embedded font files.
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This adds a new configuration "font-synthetic-style" to enable or
disable synthetic styles. This is different from "font-style-*" which
specifies a named style or disables a style completely.
Instead, "font-synthetic-style" will disable only the creation of
synthetic styles in the case a font does not support a given style.
This is useful for users who want to obviously know when a font doesn't
support a given style or a user who wants to explicitly only use the
styles that were designed by the font designer.
The default value is to enable all synthetic styles.
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