Style change in display_list/builder.rs to reduce
the number of & and * found in the code.
Rect<Au> are basically 4 integers so there is no
need to pass by reference.
Implement corner clipping.
Remove PixelFormat from WebrenderImageInfo.
Use WebRender text shadow.
Remove MallocSizeOf and Deserialize for DL items.
Closes#19649, #19680, #19802
Unfortunately, this required quite a bit of changes to the non-test
code. That's because FontContext depends on a FontCacheThread, which in
turn depends on a CoreResourceThread and therefore lots of other data
structures.
It seemed like it would be very difficult to instantiate a FontContext
as it was, and even if we could it seems like overkill to have all these
data structures present for a relatively focused test.
Therefore, I created a FontSource trait which represents the interface
which FontContext uses to talk to FontCacheThread. FontCacheThread then
implements FontSource. Then, in the test, we can create a dummy
implementation of FontSource rather than using FontCacheThread.
This actually has the advantage that we can make our dummy
implementation behave in certain specific way which are useful for
testing, for example it can count the number of times
find_font_template() is called, which helps us verify that
caching/lazy-loading is working as intended.
Fix typo
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Move display_list_builder.rs and webrender_helpers.rs
along with the new file to components/layout/display_list/
Remove apparently unused IdType enum.
Only variant used was OverflowClip.
See #19676
Use try syntax for Option where appropriate
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Do some minor cleanups in display list building
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These are two different passes during layout, but previously they
shared a state object. While some of the members are the same, many are
different so we separate them out into two separate objects. We also
change the HashMaps of these state objects to use the FnvHashMap.
This is a better approach than relying on
contains_positioned_fragments, because in the future other properties
will create absolute containing blocks.
The alias is left there temporarilly and will be removed completely in a later commit where
also components/style/gecko/generated/structs_{debug|release}.rs are re-generated (they still
use the old alias).
No need to do in-order traversal for children of InlineFlow, since
they are either inline-block or absolutely positioned elements, which
are guaranteed to be block formatting context.
Fix stylo's text-overflow handling to match gecko.
A single value sets the text-overflow on the _end_ of the text, not both start and end.
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