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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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24
Tests/LibWeb/Layout/expected/grid/grid-span-4.txt
View file

@ -1,21 +1,21 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (1,1) content-size 798x65.6875 [BFC] children: not-inline
Box <body> at (10,10) content-size 780x47.6875 [GFC] children: not-inline
BlockContainer <div.foo> at (11,11) content-size 778x21.84375 [BFC] children: inline
line 0 width: 33.9375, height: 21.84375, bottom: 21.84375, baseline: 16.921875
frag 0 from TextNode start: 0, length: 3, rect: [11,11 33.9375x21.84375]
BlockContainer <html> at (1,1) content-size 798x66 [BFC] children: not-inline
Box <body> at (10,10) content-size 780x48 [GFC] children: not-inline
BlockContainer <div.foo> at (11,11) content-size 778x22 [BFC] children: inline
line 0 width: 33.9375, height: 22, bottom: 22, baseline: 17
frag 0 from TextNode start: 0, length: 3, rect: [11,11 33.9375x22]
"foo"
TextNode <#text>
BlockContainer <div.bar> at (11,34.84375) content-size 778x21.84375 [BFC] children: inline
line 0 width: 34.546875, height: 21.84375, bottom: 21.84375, baseline: 16.921875
frag 0 from TextNode start: 0, length: 3, rect: [11,34.84375 34.546875x21.84375]
BlockContainer <div.bar> at (11,35) content-size 778x22 [BFC] children: inline
line 0 width: 34.546875, height: 22, bottom: 22, baseline: 17
frag 0 from TextNode start: 0, length: 3, rect: [11,35 34.546875x22]
"bar"
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x67.6875]
PaintableBox (Box<BODY>) [9,9 782x49.6875]
PaintableWithLines (BlockContainer<DIV>.foo) [10,10 780x23.84375]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x68]
PaintableBox (Box<BODY>) [9,9 782x50]
PaintableWithLines (BlockContainer<DIV>.foo) [10,10 780x24]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<DIV>.bar) [10,33.84375 780x23.84375]
PaintableWithLines (BlockContainer<DIV>.bar) [10,34 780x24]
TextPaintable (TextNode<#text>)