This commit reduces the code surface that interacts with raw JSON data,
reducing code complexity and improving maintainability.
Files that needed to be changed drastically were additionally
cleaned up to remove any code cruft that has accrued over time.
In order to facility this the following changes were made:
* Move JSON handling from `CascadiaSettings` into `SettingsLoader`
This allows us to use STL containers for data model instances.
For instance profiles are now added to a hashmap for O(1) lookup.
* JSON parsing within `SettingsLoader` doesn't differentiate between user,
inbox and fragment JSON data, reducing code complexity and size.
It also centralizes common concerns, like profile deduplication and
ensuring that all profiles are assigned a GUID.
* Direct JSON modification, like the insertion of dynamic profiles into
settings.json were removed. This vastly reduces code complexity,
but unfortunately removes support for comments in JSON on first start.
* `ColorScheme`s cannot be layered. As such its `LayerJson` API was replaced
with `FromJson`, allowing us to remove JSON-based color scheme validation.
* `Profile`s used to test their wish to layer using `ShouldBeLayered`, which
was replaced with a GUID-based hashmap lookup on previously parsed profiles.
Further changes were made as improvements upon the previous changes:
* Compact the JSON files embedded binary, saving 28kB
* Prevent double-initialization of the color table in `ColorScheme`
* Making `til::color` getters `constexpr`, allow better optimizations
The result is a reduction of:
* 48kB binary size for the Settings.Model.dll
* 5-10% startup duration
* 26% code for the `CascadiaSettings` class
* 1% overall code in this project
Furthermore this results in the following breaking changes:
* The long deprecated "globals" settings object will not be detected and no
warning will be created during load.
* The initial creation of a new settings.json will not produce helpful comments.
Both cases are caused by the removal of manual JSON handling and the
move to representing the settings file with model objects instead
## PR Checklist
* [x] Closes#5276
* [x] Closes#7421
* [x] I work here
* [x] Tests added/passed
## Validation Steps Performed
* Out-of-box-experience is identical to before ✔️
(Except for the settings.json file lacking comments.)
* Existing user settings load correctly ✔️
* New WSL instances are added to user settings ✔️
* New fragments are added to user settings ✔️
* All profiles are assigned GUIDs ✔️
Adds support for users to be able to set font features and axes (see the spec for more details!)
## Detailed Description
**CustomTextLayout**
- Asks the `DxFontRenderData` for the font features when getting glyphs
- _If any features have been set/updated, we always skip the "isTextSimple" shortcut_
- Asks the `_formatInUse` for any font axes when mapping characters in `_AnalyzeFontFallback`
**DxFontRenderData**
- Stores a map of font features (initialized to the [standard feature list])
- Stores a map of font axes
- Has methods to add font features/axes to the map or update existing ones
- Has methods to retrieve the font features/axes
- Sets the font axes in the `IDWriteTextFormat` when creating it
## Validation Steps Performed
It works!
[standard feature list]: ac5aef67d1/DrawableObject.ixx (L802)
Specified in #10457
Related to #1790Closes#759Closes#5828
Introduces `FontConfig`, an object that isolates font-related settings
in our profiles
Users can now define font settings in their json as so:
```
"font":{
"face": "Consolas",
"size": 12
}
```
Backwards compatible with the currently expected way of defining font
settings in the json, note however that upon hitting 'Save' in the SUI,
these settings **will be rewritten to the font-object style in the json
(as above)**.
## Validation Steps Performed
Existing functionality works, new functionality works
References #1790Closes#6049
