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LibWeb: Bring CSS line-height closer to other engines

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This patch makes a few changes to the way we calculate line-height:

- `line-height: normal` is now resolved using metrics from the used
  font (specifically, round(A + D + lineGap)).

- `line-height: calc(...)` is now resolved at style compute time.

- `line-height` values are now absolutized at style compute time.

As a consequence of the above, we no longer need to walk the DOM
ancestor chain looking for line-heights during style computation.
Instead, values are inherited, resolved and absolutized locally.

This is not only much faster, but also makes our line-height metrics
match those of other engines like Gecko and Blink.
This commit is contained in:
Andreas Kling 2024-01-12 12:39:40 +01:00
parent f0722671c3
commit e7de5cb4d2
385 changed files with 6889 additions and 6893 deletions
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12
Tests/LibWeb/Layout/expected/table/table-header-and-footer-groups.txt
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@ -4,16 +4,16 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
Box <body.table> at (10,10) content-size 298x198 table-box [TFC] children: not-inline
Box <div.bottom> at (10,10) content-size 298x99 table-footer-group children: inline
Box <(anonymous)> at (10,10) content-size 298x99 table-row children: inline
BlockContainer <(anonymous)> at (10,10) content-size 298x17.46875 table-cell [BFC] children: inline
line 0 width: 56.109375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 6, rect: [10,10 56.109375x17.46875]
BlockContainer <(anonymous)> at (10,10) content-size 298x17 table-cell [BFC] children: inline
line 0 width: 56.109375, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 6, rect: [10,10 56.109375x17]
"bottom"
TextNode <#text>
Box <div.top> at (10,109) content-size 298x99 table-header-group children: inline
Box <(anonymous)> at (10,109) content-size 298x99 table-row children: inline
BlockContainer <(anonymous)> at (10,109) content-size 298x17.46875 table-cell [BFC] children: inline
line 0 width: 26.640625, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 3, rect: [10,109 26.640625x17.46875]
BlockContainer <(anonymous)> at (10,109) content-size 298x17 table-cell [BFC] children: inline
line 0 width: 26.640625, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 3, rect: [10,109 26.640625x17]
"top"
TextNode <#text>