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layout: Rewrite clipping to be a two-phase process that takes physical

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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.
This commit is contained in:
Patrick Walton 2016-10-13 14:48:30 -07:00 • committed by Michael Howell
parent 759185abe0
commit 7df456e8ac
9 changed files with 251 additions and 162 deletions
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4
components/layout/flow.rs
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@ -935,7 +935,9 @@ pub struct BaseFlow {
/// assignment.
pub late_absolute_position_info: LateAbsolutePositionInfo,
/// The clipping region for this flow and its descendants, in layer coordinates.
/// The clipping region for this flow and its descendants, in the coordinate system of the
/// nearest ancestor stacking context. If this flow itself represents a stacking context, then
/// this is in the flow's own coordinate system.
pub clip: ClippingRegion,
/// The stacking-relative position of the display port.