1990069 - Store a mapping from anchor to all its positioned frames

Status: NEW

(Core :: CSS Parsing and Computation, enhancement)

Description

[Eitan Isaacson [:eeejay]]

We can currently retrieve a positioned frame's anchor frame with PresShell::GetAnchorPosAnchor, but the reverse relationship isn't stored. This means we need to currently iterate over all positioned frames (PresShell::mAnchorPosPositioned), retrieved their anchor frames and compare it against a given anchor.

It would be nice if, given an anchor, there was a more efficient way to retrieve its positioned frames that didn't involve searching over a variable sized list and doing a hash lookup on each one.