Significant rework that also removes a lot of unnecessarily duplicated
work while rebuilding cells in both renderers. Fixes multiple issues
with decorations and bg colors on wide chars and ligatures, while
reducing the amount of special case handling required.
Metal needed to be changed to account for wide chars having decorations
on the right half and OpenGL needed to account for multiple glyphs being
under the cursor at once (decorations and combining marks) as well as
wide chars.
This makes sure that underline styles are consistent and not stretched,
and avoids rendering overlapping text decorations or extraneous
background cells for the right halves of wide chars.
Metal already had this change made, so I copied it over from there. This
logic is more straightforward. Also copied the check to skip 0-sized
glyphs, since sometimes, for example, spaces are emitted as glyphs by
the shaper for some reason, even though they have no actual content, and
we want to avoid sending a bunch of useless stuff to the GPU.
This commit refactors RepeatablePath to contain a list of tagged unions
containing "optional" and "required" variants. Both variants have a null
terminated file path as their payload, but the tag dictates whether the
path must exist or not. This implemenation is used to force consumers to
handle the optional vs. required distinction.
This also moves the parsing of optional file paths into RepeatablePath's
parseCLI function. This allows the code to be better unit tested. Since
RepeatablePath no longer contains a simple list of RepeatableStrings,
many other of its methods needed to be reimplemented as well.
Because all of this functionality is built into the RepeatablePath type,
other config options which also use RepeatablePath gain the ability to
specify optional paths as well. Right now this is only the
"custom-shaders" option. The code paths in the renderer to load shader
files has been updated accordingly.
In the original optional config file parsing, the leading ? character
was removed when paths were expanded. Thus, when config files were
actually loaded recursively, they appeared to be regular (required)
config files and an error occurred if the file did not exist. **This
issue was not found during testing because the presence of the
"theme" option masks the error**. I am not sure why the presence of
"theme" does this, I did not dig into that.
Now because the "optional" or "required" state of each path is tracked
in the enum tag the "optional" status of the path is preserved after
being expanded to an absolute path.
Finally, this commit fixes a bug where missing "config-file" files were
not included in the +show-config command (i.e. if a user had
`config-file = foo.conf` and `foo.conf` did not exist, then `ghostty
+show-config` would only display `config-file =`). This bug applied to
`custom-shaders` too, where it has also been fixed.
Before, cells that were explicitly set to match the default bg color
were treated as if they did NOT have the default and extending would
occur. We now check the exact RGB of each cell.
Fixes#2099
This is another heuristic of sorts to make `window-padding-color=extend`
look better by default. If a fully covering glyph is used then we use
the fg color to extend rather than the background.
This doesn't account for fonts that may do this for whatever codepoints,
but I think that's a special scenario that we should just recommend
disabling this feature.
With a minimum contrast set, the colored glyphs that Powerline uses
would sometimes be set to white or black while the surrounding background
colors remain unchanged, breaking up contiguous colors on segments of
the Powerline.
This no longer happens with this patch as Powerline glyphs are now
special-cased and exempt from the minimum contrast adjustment.
There are scenarios where this configuration looks bad. This commit
introduces some heuristics to prevent it. Here are the heuristics:
* Extension is always enabled on alt screen.
* Extension is disabled if a row contains any default bg color. The
thinking is that in this scenario, using the default bg color looks
just fine.
* Extension is disabled if a row is marked as a prompt (using semantic
prompt sequences). The thinking here is that prompts often contain
perfect fit glyphs such as Powerline glyphs and those look bad when
extended.
This introduces some CPU cost to the extension feature but it should be
minimal and respects dirty tracking. This is unfortunate but the feature
makes many terminal scenarios look much better and the performance cost
is minimal so I believe it is worth it.
Further heuristics are likely warranted but this should be a good
starting set.
Fixes#1784
This was just a misunderstanding of the "spec." When both a y offset
into the image is specified and a height, the image should be stretched.
I mistakingly thought that the image should be offset (even with this
misunderstanding there was a data corruption bug).
This resolves the issue and output matches Kitty.
When hot reloading config with a new font, shaper cache data needs to be
invalidated and the font grid needs to be rebuilt. This change just
makes that happen on all config reloads since it's a rare action so it's
not a performance concern.
