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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/flex-container-width-constrained.txt
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@ -5,22 +5,22 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <(anonymous)> (not painted) [BFC] children: inline
TextNode <#text>
BlockContainer <div.box> at (10,10) content-size 81.328125x100 flex-item [BFC] children: inline
line 0 width: 6.34375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 1, rect: [10,10 6.34375x17.46875]
line 0 width: 6.34375, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 1, rect: [10,10 6.34375x17]
"1"
TextNode <#text>
BlockContainer <(anonymous)> (not painted) [BFC] children: inline
TextNode <#text>
BlockContainer <div.box> at (93.328125,10) content-size 81.328125x100 flex-item [BFC] children: inline
line 0 width: 8.8125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 1, rect: [93.328125,10 8.8125x17.46875]
line 0 width: 8.8125, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 1, rect: [93.328125,10 8.8125x17]
"2"
TextNode <#text>
BlockContainer <(anonymous)> (not painted) [BFC] children: inline
TextNode <#text>
BlockContainer <div.box> at (176.65625,10) content-size 81.328125x100 flex-item [BFC] children: inline
line 0 width: 9.09375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 1, rect: [176.65625,10 9.09375x17.46875]
line 0 width: 9.09375, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 1, rect: [176.65625,10 9.09375x17]
"3"
TextNode <#text>
BlockContainer <(anonymous)> (not painted) [BFC] children: inline