Instead of TextPaintable fragments being an offset+length view into the
layout node, they are now a view into the paintable instead.
This removes an awkward time window where we'd have bogus state in text
fragments after layout invalidation but before relayout. It also makes
the code slightly nicer in general, since there's less mixing of layout
and painting concepts.
Instead, just rely on the invalidation and lazy relayout that happens as
a consequence of mutating the DOM.
This allows multiple keystrokes to coalesce into a single relayout if
necessary, dramatically improving performance when typing text into
form fields on complex pages.
Before this change, we were not detaching paintables from DOM nodes
within shadow subtrees.
This appears to be the main reason that keyboard editing was doing
immediate forced relayout: doing a full layout invalidation meant we'd
build a new layout tree, which then hid the problem with with
still-attached paintables.
By detaching them before committing a new layout, we make it possible
for keyboard editing to just use normal relayout, instead of full forced
invalidation & relayout.
CharacterData nodes and their subclasses (most commonly Text) don't have
style, as style is specific to Elements. So there's no need to mark them
for a style update when their content is programmatically changed.
Previously, we returned from the value setter if the specified value
was above the max value. This is not required, as the getter clamps the
returned value to the max value.
Rather than make path segments virtual and refcounted let's store
`Gfx::Path`s as a list of `FloatPoints` and a separate list of commands.
This reduces the size of paths, for example, a `MoveTo` goes from 24
bytes to 9 bytes (one point + a single byte command), and removes a
layer of indirection when accessing segments. A nice little bonus is
transforming a path can now be done by applying the transform to all
points in the path (without looking at the commands).
Alongside this there's been a few minor API changes:
- `path.segments()` has been removed
* All current uses could be replaced by a new `path.is_empty()` API
* There's also now an iterator for looping over `Gfx::Path` segments
- `path.add_path(other_path)` has been removed
* This was a duplicate of `path.append_path(other_path)`
- `path.ensure_subpath(point)` has been removed
* Had one use and is equivalent to an `is_empty()` check + `move_to()`
- `path.close()` and `path.close_all_subpaths()` assume an implicit
`moveto 0,0` if there's no `moveto` at the start of a path (for
consistency with `path.segmentize_path()`).
Only the last point could change behaviour (though in LibWeb/SVGs all
paths start with a `moveto` as per the spec, it's only possible to
construct a path without a starting `moveto` via LibGfx APIs).
Before this change, we would wake up on every event loop iteration to
drive animations in single-frame images. This was a complete waste of
time and caused 100% CPU usage on our main GitHub repo page.
With this change, CPU usage is ~1% when idle on the same page. :^)
This commit introduces a WEB_SET_PROTOTYPE_FOR_INTERFACE macro that
caches the interface name in a local static FlyString. This means that
we only pay for FlyString-from-literal lookup once per browser lifetime
instead of every time the interface is instantiated.
Document::navigable() can be unpleasantly slow, since we don't have a
direct link between documents and navigables at the moment. So let's not
call it twice when once is enough.
This allows us to skip evaluating selectors like "[foo=bar]" for any
element that doesn't have a "foo" attribute.
Note that the bucket is case-insensitively keyed on the attribute name
since case sensitivity is depending on evaluation context. This ensures
we may get some false positives but no false negatives.
Reduces the number of selectors evaluated by 36% when loading our GitHub
repo at https://github.com/SerenityOS/serenity
We already grow the "rules to run" vector before appending to it, so we
can actually use unchecked_append() here and avoid the "needs to grow"
checks every time we append to it.
This takes appending from 3% to <1% when loading our GitHub repo.
When matching a CSS attribute selector against an HTML element, the
attribute name is case-insensitive. Before this change, that meant we
had to call equals_ignoring_ascii_case() on all the attribute names.
We now cache the attribute name lowercased on each Attr node, which
allows us to do FlyString-to-FlyString comparison (simple pointer
comparison).
This brings attribute selector matching from 6% to <1% when loading our
GitHub repo at https://github.com/SerenityOS/serenity
The API value of a <textarea> element is its raw value with normalized
newlines. This should be used in a couple of places where we currently
use the raw value.
Patch up existing style properties instead of using the regular style
invalidation path, which requires rule matching for each element in the
invalidated subtree.
- !important properties: this change introduces a flag used to skip the
update of animated properties overridden by !important.
- inherited animated properties: for now, these are invalidated by
traversing animated element's subtree to propagate the update.
- StyleProperties has a separate array for animated properties that
allows the removal animated properties after animation has ended,
without requiring full style invalidation.
The behavior of Crypto::UnsignedBigInt::export_data unexpectedly
does not actually remove leading zero bytes when the corresponding
parameter is passed. The caller must manually adjust for the location
of the zero bytes.
By following the spec more closely, we can actually make this function
a bit more efficient (by comparing the parent against the document
instead of looking for the first element child of the document).
If a selector must match a pseudo element, or must match the root
element, we now cache that information in the MatchingRule struct.
We also introduce separate buckets for these rules, so we can avoid
running them altogether if the current element can't possibly match.
This cuts the number of selectors evaluated by 32% when loading our
GitHub repo page https://github.com/SerenityOS/serenity
We frequently end up matching hundreds or even thousands of rules. By
giving this vector some inline capacity, we avoid a lot of the
repetitive churn from dynamically growing it all the way from 0
capacity.
This is required to upload files to GitHub. Unfortunately, this is not
currently testable with our test infrastructure. This path is only hit
from HTTP/S uploads, whereas all of our tests are limited to file://.
We were unconditionally creating new File objects for all Blob-type
values passed to `FormData.append`. We should only do so if the value is
not already a File object (or if the `filename` attribute is present).
We must also carry MIME type information forward from the underlying
Blob object.
This does not implement any of the IDL methods, but GitHub requires the
interface exists to upload files via an <input type="file"> element.
Their JS handles uploads via this element and via drag-and-drop in one
function, and check if the uploaded file is `instanceof DataTransfer` to
decide how to handle it.
This patch implements and tests window.crypto.sublte.generateKey with
an RSA-OAEP algorithm. In order for the types to be happy, the
KeyAlgorithms objects are moved to their own .h/.cpp pair, and the new
KeyAlgorithms for RSA are added there.
This patch throws away some of the spec suggestions for how to implement
the normalize_algorithm AO and uses a new pattern that we can actually
extend in our C++.
Also update CryptoKey to store the key data.
When inserting a node into a parent, any live DOM ranges that reference
the parent may need to be updated. The spec does this by increasing or
decreasing the start/end offsets of each live range *before* actually
performing the insertion.
This caused us to crash with a verification failure, since it was
possible to set the range offset to an invalid value (that would go on
to immediately become valid after the insertion was finished).
This patch fixes the issue by adding special badged helpers on Range for
Node to reach into it and increase/decrease the offsets during node
insertion. This skips the offset validity check and actually makes our
code read slightly more like the spec.
Found by Domato :^)
Rather than try to lay out masks normally, this updates the TreeBuilder
to create layout nodes for masks as a child of their user (i.e. the
masked element). This allows each use of a mask to be laid out
differently, which makes supporting `maskContentUnits=objectBoundingBox`
fairly easy.
The `SVGFormattingContext` is then updated to lay out masks last (as
their sizing may depend on their parent), and treats them like
viewports.
This is pretty ad-hoc, but the SVG specification does not give any
guidance on how to actually implement this.
When navigating to about:srcdoc we try to populate the session history
by calling populate_session_history_entry_document, if the resource is
an about:srcdoc this method will rely on the document_resource in the
SessionHistoryEntry to have a String in order for it call the right
method to create navigation params.
However when navigating to about:srcdoc directly, document_resource
will have an Empty, this leads populate_session_history_entry_document
to call the wrong method to create navigation params.
This fixes the issue by populating document_resource with an empty
string if it has an Empty and we're dealing with an about:srcdoc.
Issue: #23216
Instead of crashing with a TODO() on half of the test cases generated by
Domato, let's just return a zeroed-out SVGAnimatedLength or
SVGAnimatedNumber from getters that return them.
We'll eventually have to implement these correctly, but crashing is not
productive since it blocks us from finding other issues.
The loop that was supposed to check the chain of previous or next
siblings had a logic mistake where it would never traverse the chain,
so we would get stuck looking at the immediate sibling forever.
After removing an iframe from the DOM, its contentWindow will be
detached from its browsing context, per spec.
Because the contentWindow is still accessible, we cannot assume that
Window objects always have an associated browsing context.
This needs to be fixed in the spec, but let's add a sensible null check
in the meantime.
Since SVG gradients can reference each other, we have to keep track of
visited gradients when traversing the link chain, or we will recurse
infinitely when there's a reference cycle.
Instead of creating a generic Layout::Box, make a BlockContainer. This
allows them to be laid out by BFC, which is better than nothing(?),
even if it's not going to be correct at all.
Normally, assigning to e.g document.body.onload will forward to
window.onload. However, in a detached DOM tree, there is no associated
window, so we have nowhere to forward to, making this a no-op.
The bulk of this change is making Document::window() return a nullable
pointer, as documents created by DOMParser or DOMImplementation do not
have an associated window object, and so must be able to return null
from here.
That's not actually a DOM invariant, just something the HTML parser
refuses to build. You can still construct table-less th and td elements
using the DOM API.
