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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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10
Tests/LibWeb/Layout/expected/replaced-box-with-vertical-margins.txt
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@ -1,11 +1,11 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x216.46875 children: inline
line 0 width: 174.828125, height: 216.46875, bottom: 216.46875, baseline: 213
frag 0 from TextNode start: 0, length: 6, rect: [8,207 43.125x17.46875]
BlockContainer <body> at (8,8) content-size 784x216 children: inline
line 0 width: 174.828125, height: 216, bottom: 216, baseline: 213
frag 0 from TextNode start: 0, length: 6, rect: [8,207 43.125x17]
"Well, "
frag 1 from ImageBox start: 0, length: 0, rect: [51,33 64x138]
frag 2 from TextNode start: 0, length: 9, rect: [115,207 67.703125x17.46875]
frag 2 from TextNode start: 0, length: 9, rect: [115,207 67.703125x17]
" friends."
TextNode <#text>
ImageBox <img#image> at (51,33) content-size 64x138 children: not-inline
@ -13,7 +13,7 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x216.46875]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x216]
TextPaintable (TextNode<#text>)
ImagePaintable (ImageBox<IMG>#image) [51,33 64x138]
TextPaintable (TextNode<#text>)