The tzname array stores the abbreviated names of the current time zone
when in standard and daylight time. These abbreviations are ambiguous;
a single abbreviation often maps to multiple time zones. For example,
EST is used by America/New_York and America/Detroit, and CST could be
the abbreviation of Central Standard Time or China Standard Time.
Instead, we mimic a subset of how both ICU and Howard Hinnant's "date"
library determines the current time zone. First, we try to parse the TZ
environment variable. If that fails, or isn't set, we try to resolve the
/etc/localtime symbolic link. On most Linux systems and on macOS, this
is a link to the current TZDB file in use.
If all of the above fails, we fall back to UTC.
This is needed to eventually share a header list between a Request or
Response object's internal infra request/response and the object's
exposed Header object.
This makes it possible to propagate exceptions from a function that
returns JS::ThrowCompletionOr via TRY() in another function that returns
WebIDL::ExceptionOr.
A Request/Response instance should always be heap-allocated and have
clear ownership, so let's also wrap it in a NonnullOwnPtr instead of
putting them on the stack.
This still needs a project-wide cleanup to remove handles captured in
lambdas, which is now longer required.
For now, this will be used in the next commit implementing promise AOs
from Web IDL, which make heavy use of deferred callbacks.
There's a big comment explaining it because it's somewhat confusing, but
the behavior I'm copying from other editors is, when you repeatedly
press the `Home` key:
1. Go to the start of the visual line, where it wraps.
2. Go to the first non-whitespace character on the logical line, which
is what happens in non-wrapped lines.
3. Go to column 0.
4. GOTO 2
This fixes an edge case, where the destination rect falls partly
outside the painter, so is clipped to a smaller size in
`get_region_bitmap()` (which needs to be accounted for with an extra
offset).
This now copies the area under the destination to a new bitmap, that
is then scaled to the size of the source. The element is then painted
into that bitmap, which is then scaled and painted back to
the destination. This is done as many effects such as shadows, border
radii, filters, etc require being able to read pixels from the painter.
This does work (and is not that noticeable in many cases), but it does
mean there may be a few scaling artifacts in the background
around transformed elements. Though that was already the case before
anyway for the elements (since it is just a bitmap scale).
What we really want is to (where possible) just scale the paintable
and its descendants, then paint things normally, which would give
much nicer results (but is much more tricky to achieve).
This also now makes it so only a bitmap of the size of the paintable is
copied/created, rather than the whole page.
This method returns the total area this element will paint to.
Currently, this just means accounting for box-shadows, though
there are likely more effects that need to be accounted for here.
This patch changes the *computed* representation of the following CSS
properties to use CSS::Size:
- width, min-width, max-width
- height, min-height, max-height
A few things had to change in order for things to keep working,
but I tried to keep the diff to a minimum.
The main trouble was that `min-width` and `max-width` can't actually be
`auto`, but they *can* be `none`. We previously treated `auto` as a
valid value (and it behaved mostly like `none`).
Until now, we've been using CSS::LengthPercentage, sometimes wrapped in
Optional, to represent CSS sizes.
This meant we could not support modern values like `min-content`,
`max-content`, `fit-content(<length>)`. We were also conflating `none`
and `auto` which made the `min-*` and `max-*` properties confusing.
The new CSS::Size class covers all possible size values as individual
substates. It'll be quite a bit of work to make all layout code aware of
the additional features, this patch merely makes the new type available.
We don't need to notify the web views that some deeply nested iframe
has started loading a new URL (and we don't want it showing up in the
browser location bar either!)
Two issues made this class unusable on other platforms:
- Hardcoded /res paths to icons
- It required a GUI::TreeView for palette access
This patch simply patches out those features on non-Serenity systemsf
for now.
When mousing over twitter, 17% of time was spent computing stacking
context transform origins. Since this never changes after the stacking
context is created, we can cache it and avoid all that work.
