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LibWeb: Bring CSS line-height closer to other engines

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

View file

@ -1,30 +1,30 @@
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 784x34.9375 children: not-inline
Box <div.container> at (8,8) content-size 784x34.9375 [GFC] children: not-inline
BlockContainer <div.item.right-bottom> at (400,25.46875) content-size 392x17.46875 [BFC] children: inline
line 0 width: 99.703125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 12, rect: [400,25.46875 99.703125x17.46875]
BlockContainer <body> at (8,8) content-size 784x34 children: not-inline
Box <div.container> at (8,8) content-size 784x34 [GFC] children: not-inline
BlockContainer <div.item.right-bottom> at (400,25) content-size 392x17 [BFC] children: inline
line 0 width: 99.703125, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 12, rect: [400,25 99.703125x17]
"right-bottom"
TextNode <#text>
BlockContainer <div.item.left> at (8,8) content-size 392x34.9375 [BFC] children: inline
line 0 width: 26.25, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 4, rect: [8,8 26.25x17.46875]
BlockContainer <div.item.left> at (8,8) content-size 392x34 [BFC] children: inline
line 0 width: 26.25, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 4, rect: [8,8 26.25x17]
"left"
TextNode <#text>
BlockContainer <div.item.right-top> at (400,8) content-size 392x17.46875 [BFC] children: inline
line 0 width: 70.234375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 9, rect: [400,8 70.234375x17.46875]
BlockContainer <div.item.right-top> at (400,8) content-size 392x17 [BFC] children: inline
line 0 width: 70.234375, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 9, rect: [400,8 70.234375x17]
"right-top"
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x34.9375]
PaintableBox (Box<DIV>.container) [8,8 784x34.9375]
PaintableWithLines (BlockContainer<DIV>.item.right-bottom) [400,25.46875 392x17.46875]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x34]
PaintableBox (Box<DIV>.container) [8,8 784x34]
PaintableWithLines (BlockContainer<DIV>.item.right-bottom) [400,25 392x17]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<DIV>.item.left) [8,8 392x34.9375]
PaintableWithLines (BlockContainer<DIV>.item.left) [8,8 392x34]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<DIV>.item.right-top) [400,8 392x17.46875]
PaintableWithLines (BlockContainer<DIV>.item.right-top) [400,8 392x17]
TextPaintable (TextNode<#text>)