5 commits

Author	SHA1	Message	Date
Andreas Kling	f8aa0c144f	LibWeb: Store box's containing line box fragment in FormattingState ... Layout should not change any properties of a box until the moment a FormattingState is committed.	2022-02-28 14:17:44 +01:00
Andreas Kling	aa72ebf7aa	LibWeb: Use copy-on-write to make cloning a FormattingState much cheaper ... Instead of making a full copy of every NodeState when cloning a FormattingState, we make NodeState ref-counted and implement a basic copy-on-write mechanism. FormattingState::get_mutable() now makes a deep copy of the NodeState when first accessed *if* it is shared with other FormattingStates.	2022-02-28 14:17:44 +01:00
Andreas Kling	5a770f2eff	LibWeb: Fix floating boxes getting stacked on top of each other ... This was caused by the freestanding margin_box_rect() using 0 for the content height instead of the actual content height.	2022-02-21 19:38:50 +01:00
Andreas Kling	2615728d6b	LibWeb: Store overflow data in the FormattingState	2022-02-21 18:35:12 +01:00
Andreas Kling	c9700e100e	LibWeb: Start making our layout system "transactional" ... This patch adds a map of Layout::Node to FormattingState::NodeState. Instead of updating layout nodes incrementally as layout progresses through the formatting contexts, all updates are now written to the corresponding NodeState instead. At the end of layout, FormattingState::commit() is called, which transfers all the values from the NodeState objects to the Node. This will soon allow us to perform completely non-destructive layouts which don't affect the tree. Note that there are many imperfections here, and still many places where we assign to the NodeState, but later read directly from the Node instead. I'm just committing at this stage to make subsequent diffs easier to understand.	2022-02-21 18:35:12 +01:00