When we process the system fallback list, we can produce a long list
of fonts to be speculatively processed by the shaper.
Until this commit, the shaper would always keep the associated
freetype face open forever, which increases the number of open
files and the amount of allocated memory.
This commit allows the shaper to release a font if it has never
produced any valid shaper results, which keeps the list down
to just the fonts that are in use.
This commit allows the x11 window implementation to detect changes
in the DPI that occur after a window is created.
These can occur when changing desktop resolution or when changing
the accessibility option for "Large Text" in gnome.
In order to avoid continually polling for the value on every resize,
we look for the `_GTK_EDGE_CONSTRAINTS` atom in our property change
notifications. This seems to be sent at least as often as the
dpi/scaling changes.
It's also worth noting that some dpi changes don't generate resize
events, so we can't just read the dpi value on every resize, because
we'd miss some of those changes.
Part of this commit changes the font scaling logic: previously
we'd keep a notion of "dpi scale" to apply. That dates from an
earlier time in wezterm where we didn't think that we knew an
actual dpi value.
The way that worked was that we'd compare our current guestimate
of the DPI against what we though the baseline OS dpi should be to
produce a scaling factor.
On X11 that dpi value is global and we'd effectively always produce
a revised scaling factor of 1 after we'd set up the initial window.
This commit changes that logic to just pass down the actual DPI value
to the font code. That DPI value already accounts for HiDPI scaling
so this is hopefully a NOP change for the other systems.
refs: https://github.com/wez/wezterm/issues/667
Replaces the last usage of ttf-parser with calling into freetype.
This removes a source of inconsistency, as ttf-parser doesn't support
all of the things that freetype does.
Notably, this prevents a weird error from blowing up codepoint coverage
calculations on a system where I have helvetica.bdf in my font dir for
long-forgotten reasons.
```
WEZTERM_LOG=wezterm_font=trace,info wezterm
```
will list fonts found in font_dirs and the builtin fonts.
It can't show all fonts found via the system locator, because
that only has an interface for finding fonts by matching name,
not listing all of them.
With this configuration:
```lua
local wezterm = require 'wezterm'
return {
font_dirs = {"/Users/wez/Downloads/Inconsolata"},
font = wezterm.font("Inconsolata"),
font_locator = "ConfigDirsOnly"
}
```
wezterm is now able to see the 74 variations that are available
in the single inconsolata ttf.
Running `WEZTERM_LOG=wezterm_font=trace wezterm` will log the
variations.
refs: https://github.com/wez/wezterm/issues/655
If shaping can't resolve some glyphs, queue the font locator
fallback resolution to another thread; meanwhile, a last resort
glyph is used.
That thread can trigger an invalidation once the fallback resolve
is complete, the window is invalidated and the last resort glyph
is replaced by the resolve glyph.
refs: https://github.com/wez/wezterm/issues/559
refs: https://github.com/wez/wezterm/issues/508
Keep track of the glyphs we've already advised about (until the
config is reloaded) so that we don't keep spamming the user.
refs: https://github.com/wez/wezterm/issues/559
* Check built-in fonts before asking the system for codepoint coverage
* If one of the earlier stages resolved some fonts, skip the remaining
stages and speculatively shape what we have. This avoids triggering
the system font lookup for fonts that are present in the font_dirs
or that are built-in, such as powerline symbols.
refs: https://github.com/wez/wezterm/issues/559
The dwrote crate offers functions that can extract the underlying
font file name(s) from the system, so let's use those to get
OnDisk font handles and save some memory.
refs: https://github.com/wez/wezterm/issues/559
