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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/table/avoid-div-by-zero-in-table-measures.txt
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@ -1,19 +1,19 @@
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 784x23.46875 children: not-inline
TableWrapper <(anonymous)> at (8,8) content-size 6x23.46875 [BFC] children: not-inline
Box <table> at (8,8) content-size 6x23.46875 table-box [TFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x23 children: not-inline
TableWrapper <(anonymous)> at (8,8) content-size 6x23 [BFC] children: not-inline
Box <table> at (8,8) content-size 6x23 table-box [TFC] children: not-inline
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
Box <tbody> at (8,8) content-size 0x19.46875 table-row-group children: not-inline
Box <tbody> at (8,8) content-size 0x19 table-row-group children: not-inline
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
Box <tr> at (10,10) content-size 0x19.46875 table-row children: not-inline
Box <tr> at (10,10) content-size 0x19 table-row children: not-inline
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
BlockContainer <td> at (11,11) content-size 0x17.46875 table-cell [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: [11,11 14.265625x17.46875]
BlockContainer <td> at (11,11) content-size 0x17 table-cell [BFC] children: inline
line 0 width: 14.265625, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 0, length: 1, rect: [11,11 14.265625x17]
"A"
TextNode <#text>
BlockContainer <(anonymous)> (not painted) children: inline
@ -25,10 +25,10 @@ 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 784x23.46875]
PaintableWithLines (TableWrapper(anonymous)) [8,8 6x23.46875] overflow: [8,8 17.265625x23.46875]
PaintableBox (Box<TABLE>) [8,8 6x23.46875] overflow: [8,8 17.265625x23.46875]
PaintableBox (Box<TBODY>) [8,8 0x19.46875] overflow: [10,10 15.265625x19.46875]
PaintableBox (Box<TR>) [10,10 0x19.46875] overflow: [10,10 15.265625x19.46875]
PaintableWithLines (BlockContainer<TD>) [10,10 2x19.46875] overflow: [10,10 15.265625x19.46875]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x23]
PaintableWithLines (TableWrapper(anonymous)) [8,8 6x23] overflow: [8,8 17.265625x23]
PaintableBox (Box<TABLE>) [8,8 6x23] overflow: [8,8 17.265625x23]
PaintableBox (Box<TBODY>) [8,8 0x19] overflow: [10,10 15.265625x19]
PaintableBox (Box<TR>) [10,10 0x19] overflow: [10,10 15.265625x19]
PaintableWithLines (BlockContainer<TD>) [10,10 2x19] overflow: [10,10 15.265625x19]
TextPaintable (TextNode<#text>)