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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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20
Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline.txt
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@ -1,18 +1,18 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (1,1) content-size 798x119.46875 [BFC] children: not-inline
BlockContainer <body> at (10,10) content-size 500x101.46875 children: not-inline
BlockContainer <div.a> at (31,21) content-size 458x79.46875 children: not-inline
BlockContainer <div.b> at (72,52) content-size 376x17.46875 children: inline
line 0 width: 41.78125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 5, rect: [73,52 39.78125x17.46875]
BlockContainer <html> at (1,1) content-size 798x119 [BFC] children: not-inline
BlockContainer <body> at (10,10) content-size 500x101 children: not-inline
BlockContainer <div.a> at (31,21) content-size 458x79 children: not-inline
BlockContainer <div.b> at (72,52) content-size 376x17 children: inline
line 0 width: 41.78125, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 5, rect: [73,52 39.78125x17]
"Hello"
InlineNode <span>
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x121.46875]
PaintableWithLines (BlockContainer<BODY>) [9,9 502x103.46875]
PaintableWithLines (BlockContainer<DIV>.a) [10,10 500x101.46875]
PaintableWithLines (BlockContainer<DIV>.b) [71,51 378x19.46875]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x121]
PaintableWithLines (BlockContainer<BODY>) [9,9 502x103]
PaintableWithLines (BlockContainer<DIV>.a) [10,10 500x101]
PaintableWithLines (BlockContainer<DIV>.b) [71,51 378x19]
InlinePaintable (InlineNode<SPAN>)
TextPaintable (TextNode<#text>)