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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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36
Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float.txt
View file

@ -1,45 +1,45 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x33.46875 [BFC] children: not-inline
BlockContainer <html> at (0,0) content-size 800x33 [BFC] children: not-inline
BlockContainer <(anonymous)> at (0,0) content-size 800x0 children: inline
TextNode <#text>
BlockContainer <body> at (8,8) content-size 784x17.46875 children: not-inline
BlockContainer <body> at (8,8) content-size 784x17 children: not-inline
BlockContainer <(anonymous)> at (8,8) content-size 784x0 children: inline
TextNode <#text>
BlockContainer <div.ab> at (108,8) content-size 684x17.46875 children: not-inline
BlockContainer <div.ab> at (108,8) content-size 684x17 children: not-inline
BlockContainer <(anonymous)> at (108,8) content-size 684x0 children: inline
TextNode <#text>
BlockContainer <div> at (108,8) content-size 684x0 children: inline
TextNode <#text>
BlockContainer <div.a> at (108,8) content-size 14.265625x17.46875 floating [BFC] children: inline
line 0 width: 14.265625, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 1, rect: [108,8 14.265625x17.46875]
BlockContainer <div.a> at (108,8) content-size 14.265625x17 floating [BFC] children: inline
line 0 width: 14.265625, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 1, rect: [108,8 14.265625x17]
"A"
TextNode <#text>
TextNode <#text>
BlockContainer <(anonymous)> at (108,8) content-size 684x0 children: inline
TextNode <#text>
BlockContainer <div.b> at (122.265625,8) content-size 669.734375x17.46875 [BFC] children: inline
line 0 width: 9.34375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 1, rect: [122.265625,8 9.34375x17.46875]
BlockContainer <div.b> at (122.265625,8) content-size 669.734375x17 [BFC] children: inline
line 0 width: 9.34375, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 1, rect: [122.265625,8 9.34375x17]
"B"
TextNode <#text>
BlockContainer <(anonymous)> at (108,25.46875) content-size 684x0 children: inline
BlockContainer <(anonymous)> at (108,25) content-size 684x0 children: inline
TextNode <#text>
BlockContainer <(anonymous)> at (8,25.46875) content-size 784x0 children: inline
BlockContainer <(anonymous)> at (8,25) content-size 784x0 children: inline
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x33.46875]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x33]
PaintableWithLines (BlockContainer(anonymous)) [0,0 800x0]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x17.46875]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x17]
PaintableWithLines (BlockContainer(anonymous)) [8,8 784x0]
PaintableWithLines (BlockContainer<DIV>.ab) [108,8 684x17.46875]
PaintableWithLines (BlockContainer<DIV>.ab) [108,8 684x17]
PaintableWithLines (BlockContainer(anonymous)) [108,8 684x0]
PaintableWithLines (BlockContainer<DIV>) [108,8 684x0]
PaintableWithLines (BlockContainer<DIV>.a) [108,8 14.265625x17.46875]
PaintableWithLines (BlockContainer<DIV>.a) [108,8 14.265625x17]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer(anonymous)) [108,8 684x0]
PaintableWithLines (BlockContainer<DIV>.b) [122.265625,8 669.734375x17.46875]
PaintableWithLines (BlockContainer<DIV>.b) [122.265625,8 669.734375x17]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer(anonymous)) [108,25.46875 684x0]
PaintableWithLines (BlockContainer(anonymous)) [8,25.46875 784x0]
PaintableWithLines (BlockContainer(anonymous)) [108,25 684x0]
PaintableWithLines (BlockContainer(anonymous)) [8,25 784x0]