This exposes some functions on wr::DisplayListBuilder to set hit-test
info and to do hit-tests.
The mechanism to set hit-test info is made a little more generic than is
actually used in this patchset, because doing it this way allows for
more optimization possibilities.
Specifically, the API allows setting some hit-testing state which is then
applied to all display items that are created until that state is
updated or cleared. An alternative would be to specify the hit-testing
state explicitly when creating particular display items; however doing
that would force the call sites that create the display items to compute
or obtain the hit-testing state, which would make the code less
encapsulated and harder to refactor/optimize.
MozReview-Commit-ID: EJoCFv83iu8
There are cases where we do a main-thread paint at a scroll position
where sticky offsets have been applied in order to keep sticky items
visually unmoving. From that paint, it's possible to do an async-scroll
in the direction that reduces the sticky offset. In order for WR to
handle this case properly we need to tell WR how much of a sticky offset
was already applied on the main thread.
MozReview-Commit-ID: 79DsfPpsIfA
This patch was generated automatically by the "modeline.py" script, available
here: https://github.com/amccreight/moz-source-tools/blob/master/modeline.py
For every file that is modified in this patch, the changes are as follows:
(1) The patch changes the file to use the exact C++ mode lines from the
Mozilla coding style guide, available here:
https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Mode_Line
(2) The patch deletes any blank lines between the mode line & the MPL
boilerplate comment.
(3) If the file previously had the mode lines and MPL boilerplate in a
single contiguous C++ comment, then the patch splits them into
separate C++ comments, to match the boilerplate in the coding style.
MozReview-Commit-ID: 77D61xpSmIl
This edge case happens when:
- we have a display item A nested inside another display item B
- B has pushed an out-of-band clip, and
- A's clip chain doesn't connect directly to the end of B's clip chain
but instead connects somewhere farther up the clip chain
See comments in the patch for more details.
MozReview-Commit-ID: 4mCCaVUQuvH
This does 3 things that were all a bit too intermixed to split out cleanly:
1. Teaches TextDrawTarget to handle rectangular clips (while also completely
forbidding other ones). This is necessary to handle how gecko "overdraws"
decorations with clips to create the illusion of continuous lines when they're
actually made out of multiple lines, possibly from different display items
with different lines. Previously gecko *was* handing these clips to
TextDrawTarget to use these clips, but we were just ignoring them.
This is also necessary work to support partial glyphs natively (which apply
rectangular clips to glyphs). Also note that this currently causes a bug
in webrender if combined with zero-blur shadows, but it's not a regression
since we already mishandle clipped decorations. I will work on fixing this
upstream.
2. Changes the intermediate representation of lines from the old webrender
format to a rect-based one. This is in preperation for webrender adopting
that format in a future update.
3. Changes the way wavy lines are processed, correcting some errors in the
old wavy line bindings that lead to them being positioned incorrectly. Also
introduces a wavyLineThickness property that the will be required in a
future webrender update. Wavy lines are unlike any other line, so it's
ultimately desirable to distinguish them.
The net result of these changes is that a companion upstream change (webrender#1923)
will make decoration rendering nearly identical to gecko, and much nicer.
However the clipped shadows issue will need to be seperately resolved before
actually closing this issue.
MozReview-Commit-ID: 6O2wLA6bU3C
This does 3 things that were all a bit too intermixed to split out cleanly:
1. Teaches TextDrawTarget to handle rectangular clips (while also completely
forbidding other ones). This is necessary to handle how gecko "overdraws"
decorations with clips to create the illusion of continuous lines when they're
actually made out of multiple lines, possibly from different display items
with different lines. Previously gecko *was* handing these clips to
TextDrawTarget to use these clips, but we were just ignoring them.
This is also necessary work to support partial glyphs natively (which apply
rectangular clips to glyphs). Also note that this currently causes a bug
in webrender if combined with zero-blur shadows, but it's not a regression
since we already mishandle clipped decorations. I will work on fixing this
upstream.
2. Changes the intermediate representation of lines from the old webrender
format to a rect-based one. This is in preperation for webrender adopting
that format in a future update.
3. Changes the way wavy lines are processed, correcting some errors in the
old wavy line bindings that lead to them being positioned incorrectly. Also
introduces a wavyLineThickness property that the will be required in a
future webrender update. Wavy lines are unlike any other line, so it's
ultimately desirable to distinguish them.
The net result of these changes is that a companion upstream change (webrender#1923)
will make decoration rendering nearly identical to gecko, and much nicer.
However the clipped shadows issue will need to be seperately resolved before
actually closing this issue.
MozReview-Commit-ID: 6O2wLA6bU3C
This handles some cases where a nested display item's clip chain
implicitly extends from the wrapper item's clip chain.
MozReview-Commit-ID: DmghxOWi81K
Instead of just keeping a count of how many "extra clips" (aka
out-of-band clips) we have pushed, track more complex information for
each clip. In particular, track the display item's normal clip chain, as
well as the clip id of the extra clip that was pushed. This will be
needed to override clip cache information in the next patch.
MozReview-Commit-ID: AWKDTkelhyL
By using a variant we can keep a single stack of both clips and
scrollframes, rather than two separate stacks. This is important because
we will want to know how the things are interleaved (e.g. if the last
thing that was pushed was a clip or a scrollframe).
MozReview-Commit-ID: DbhDj2tTq64
We don't use the code to track the parents of each scroll id, so we can
dump it and just keep a set of scroll ids that we've defined to avoid
redefining them.
MozReview-Commit-ID: HY8y7xt9AJ6
The APIs now allow providing the parent clip or scroll info explicitly
instead of having to push it on the stack. For now we just pass
Nothing() to preserve the existing behaviour, so this change is a
functinoal no-op.
MozReview-Commit-ID: dtNamN595
This exposes the capacity of the underlying vec and sets it to the capacity of
the previous display list (mLastDisplayListSize). Doing so helps us avoid
reallocing up to the desired size every frame.
Note: the rebased version doesn't actually use a reasonable size. That will happen
in bug 1405819.
