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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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28
Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width-constraints.txt
View file

@ -1,24 +1,24 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (1,1) content-size 798x56.9375 [BFC] children: not-inline
BlockContainer <body> at (10,10) content-size 780x38.9375 children: not-inline
BlockContainer <div.box> at (11,11) content-size 138.28125x17.46875 children: inline
line 0 width: 138.28125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 18, rect: [11,11 138.28125x17.46875]
BlockContainer <html> at (1,1) content-size 798x56 [BFC] children: not-inline
BlockContainer <body> at (10,10) content-size 780x38 children: not-inline
BlockContainer <div.box> at (11,11) content-size 138.28125x17 children: inline
line 0 width: 138.28125, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 18, rect: [11,11 138.28125x17]
"Well hello friends"
TextNode <#text>
BlockContainer <div.box2> at (11,30.46875) content-size 138.28125x17.46875 children: inline
line 0 width: 138.28125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 18, rect: [11,30.46875 138.28125x17.46875]
BlockContainer <div.box2> at (11,30) content-size 138.28125x17 children: inline
line 0 width: 138.28125, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 18, rect: [11,30 138.28125x17]
"Well hello friends"
TextNode <#text>
BlockContainer <(anonymous)> at (10,48.9375) content-size 780x0 children: inline
BlockContainer <(anonymous)> at (10,48) content-size 780x0 children: inline
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x58.9375]
PaintableWithLines (BlockContainer<BODY>) [9,9 782x40.9375]
PaintableWithLines (BlockContainer<DIV>.box) [10,10 140.28125x19.46875]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x58]
PaintableWithLines (BlockContainer<BODY>) [9,9 782x40]
PaintableWithLines (BlockContainer<DIV>.box) [10,10 140.28125x19]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<DIV>.box2) [10,29.46875 140.28125x19.46875]
PaintableWithLines (BlockContainer<DIV>.box2) [10,29 140.28125x19]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer(anonymous)) [10,48.9375 780x0]
PaintableWithLines (BlockContainer(anonymous)) [10,48 780x0]