Layers were a feature of the legacy drawing path. If we re-add them at
some point, it probably makes more sense to make them a product of
display list inspection.
This change also remove a bunch of dead painting code.
This removes paint threads, rust-layers dependency, and changes
optional webrender types to be required.
The use_webrender option has been removed, however I've left
the "-w" command line option in place so that wpt
runner can continue to pass that. Once it's removed from there
we can also remove the -w option.
Once this stage is complete, it should be fine to change the
display list building code to generate webrender display
lists directly and avoid the conversion step.
border box positions and transforms into account.
Clipping region computation now follows a simple process: (1) in the
parent's coordinate system, parents store appropriate clipping regions
into children; (2) each child moves its clipping region to its own
coordinate system if necessary.
Because clipping region computation is now based on stacking-relative
border box positions and the `transform_rect` method, it can handle
`position: relative` offsets and more types of transforms, such as
scaling.
Improves etsy.com.
Closes#13753.
placing block formatting contexts in the sequential fallback.
The existing block position isn't yet computed at that time, so it
contains junk data. It just so happened to work on first reflow because
that value is usually set to zero, but it usually failed on subsequent
reflows.
Improves certain Wikipedia pages.
Closes#13630 (though Google is still broken; it was a separate bug and
will be split off into a separate issue).
Implement sequential fallback to float speculation
This shouldn't impact any pages that are already rendering correctly, but it is a very naive implementation of this pass.
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Simplify the way that stacking contexts are collected. Instead of
passing the StackingContextId down the tree, pass the parent
StackingContext itself. This will allow future patches to get more
information about the parent stacking context (such as location).
Also remove the return value of collect_stacking_contexts, which was
unused.
Separating out `REPOSITION` from `REPAINT` allows us to compute
stacking-context-relative positions without rebuilding the display list.
This saves a lot of time when responding to script-to-layout queries.
sizes if the block formatting contexts have negative margins.
The heuristics that determine how and whether floats flow into the
margins are not valid in that case.
Closes#13299.
Move collapse through margin to the top of block flow
<!-- Please describe your changes on the following line: -->
Based on the spec, a collapse through box should be put on the top edge of the flow. This fixed ~110 reftests
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Fix root flow's size at the browser window's size
When `<body>` needs to calculate its size based on `<html>`'s size, that should be the size of the browser window itself.
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Fix absolute-flow's auto positioning
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If an absolute positioned flow has no top, bottom, left, right property, its hypothetical box position should be the margin-end of its previous sibling, not the border-end.
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Implement flexible box layout for row container
<!-- Please describe your changes on the following line: -->
This pull requests implements basic flexible box layout for row container.
It has implemented most basic flexbox features, including grow, shrink, multi-line, *reverse properties, and alignment under `justify-content`, `align-items`, `align-self`, `align-content`.
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r? @pcwalton
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Iterate over the items, create lines from them, resolve flex lengths
against them, set their inline size and margin lengths, and align them
according to 'justify-content', 'align-content' and 'align-self'.
