Instead of allocating a new glyph run solely to shift each glyph by the
painter's offset, this offset could be encoded in a paint command and
applied later during command execution.
Every single client of this function was immediately calling paintable()
on the result anyway, so there was no need to return a layout node!
This automatically leverages the cached containing block pointer we
already have in Paintable, which melts away a bunch of unnecessary
traversal in hit testing and painting. :^)
This will allow us to get at the font's glyphs as paths, which will
eventually enable us to implement glyph rotation. We'll have to do our
own caching then, but we can then hopefully share the caching across the
Type0 / Type1 / TrueType codepaths.
It also gives us access to a font's glyphs by glyph id, which will help
us implementing looking up glyph ids by postscript name. (Else we'd
have to plumb through a whole Painter::draw_glyph_by_postscript_name()
API just for LibPDF.)
No behavior change.
It's like ScaledFont::with_size(), except that it guarantees that the
result is non-null and ScaledFont. (Smart pointers don't allow
covariant return types, else we could just narrow down the return
type of with_size() while still overriding the base method.)
No behavior change.
`var` declarations can have duplicates, but duplicate `let` or `const`
bindings are a syntax error.
Because of this, we can sink `let` and `const` directly into the
preferred_dst if available. This is not safe for `var` since the
preferred_dst may be used in the initializer.
This patch fixes the issue by simply skipping the preferred_dst
optimization for `var` declarations.
Liberation Sans still doesn't have the vast majority of the
Zapf Dingbats glyphs, but now we map the Zapf Dingbats names to good
unicode values. So we only need to use a different font and all should
work. (And Liberation Sans has _some_ of the glyphs, like 13 of the
223.) And we now render empty squares instead of wrong glyphs for the
ones we don't have.
I haven't seen any PDFs using ZapfDingbats in the wild, but they
probably exist somewhere.
(Tests/LibPDF/standard-14-fonts.pdf is a synthetic PDF using it.)
Turns out there's a spec that goes with the table.
The big change here is that we can now map `uni1234` to 0x1234 and
`u123456` to 0x123456.
The parts where we split a name on `_` and map each component
and the part where we're supposed to allow multiple groups of 4
after `uni` aren't implemented yet.
The ZapfDingbats lookup is also still missing.
I haven't seen this have an effect in practice, but it's easy to
construct a PDF with a custom encoding where it would make a
difference.
By storing a list of positioned and floating descendants within the
stacking context tree node, we can eliminate the need for costly
paintable tree traversals during hit-testing.
This optimization results in hit-testing being 2 to 2.5 times faster
on https://ziglang.org/documentation/master/
The specification says the final step of this algorithm is to return
null. Previously, the browser would crash if the content of an iframe
was appended to the document before its offsetParent property was
queried.
Previously @media rule conditions could be updated by assigning to
`conditionText`. This change aligns our implementation with the CSSOM
specification, which says `CSSConditionRule.conditionText` should be
read-only.
Instead of looking these up in the VM execution context stack whenever
we need them, we now just cache them in the interpreter when entering
a new call frame.
Comparing two Values has to call the generic same_value() helper,
and we can avoid this by simply using a stronger type for built-in
native function handlers.
The exisiting fast path only permits for valid i32 values.
On https://cyxx.github.io/another_js, this eliminates the runtime of
typed_array_set_element, and reduces the runtime of put_by_value from
11.1% to 7.7%.
This reverts commit 9c943f36ed.
This optimization is superseded by optimizing IsValidIntegerIndex for
TypedArrays with non-resizable ArrayBuffers. Reverting this commit has
no impact on test-js, test262, or live website performance.
This reverts commit 5fd53652b7.
This optimization is superseded by optimizing IsValidIntegerIndex for
TypedArrays with non-resizable ArrayBuffers. Reverting this commit has
no impact on test-js, test262, or live website performance.
This reverts commit 72cee4c88b.
This optimization is superseded by optimizing IsValidIntegerIndex for
TypedArrays with non-resizable ArrayBuffers. Reverting this commit has
no impact on test-js, test262, or live website performance.
If we know the TA does not have a resizable ArrayBuffer, we can avoid
most of the heavy lifting that IsValidIntegerIndex performs.
On https://cyxx.github.io/another_js, this reduces the runtime of
IsValidIntegerIndex from 7.1% to 3.7%.
Introduces the rendering of scroll thumbs in vertical and horizontal
directions. Currently, the thumbs are purely graphical elements that
do not respond to mouse events. Nevertheless, this is beneficial as it
makes it easier to identify elements that should respond to scrolling
events.
Painting of scrollbars uncovers numerous bugs in the calculation of
scrollable overflow rectangles highlighting all the places where
elements are made scrollable whey they shouldn't be. Positively, this
issue might motivate us to pay more attention to this problem to
eliminate unnecessary scrollbars.
Currently, the scrollbar style is uniform across all platforms: a
semi-transparent gray rectangle with rounded corners.
Also here we add `scrollbar-width: none` to all existing scrolling
ref-tests, so they keep working with this change.
The list of border radii clips needs to be reset before being populated
with new clips that have refreshed positions. Besides fixing painting,
this also improves performance because the number of sample/blit
commands does not increase as we scroll.
The order is important because clip rectangles are calculated with the
scroll offset taken into account. Therefore, they need to be applied
before the scroll offset is changed, to avoid accounting for the scroll
offset twice.
