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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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48
Tests/LibWeb/Layout/expected/table/line-breaking-in-cells.txt
View file

@ -1,38 +1,38 @@
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 784x39.40625 children: not-inline
TableWrapper <(anonymous)> at (8,8) content-size 61x39.40625 [BFC] children: not-inline
Box <table> at (8,8) content-size 61x39.40625 table-box [TFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x38 children: not-inline
TableWrapper <(anonymous)> at (8,8) content-size 61x38 [BFC] children: not-inline
Box <table> at (8,8) content-size 61x38 table-box [TFC] children: not-inline
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
Box <tbody> at (8,8) content-size 61x39.40625 table-row-group children: not-inline
Box <tbody> at (8,8) content-size 61x38 table-row-group children: not-inline
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
Box <tr> at (8,8) content-size 61x39.40625 table-row children: not-inline
Box <tr> at (8,8) content-size 61x38 table-row children: not-inline
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
BlockContainer <td> at (10,18.96875) content-size 14.296875x17.46875 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: [10,18.96875 14.265625x17.46875]
BlockContainer <td> at (10,18.5) content-size 14.296875x17 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: [10,18.5 14.265625x17]
"A"
TextNode <#text>
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
BlockContainer <td> at (28.296875,10) content-size 20.40625x35.40625 table-cell [BFC] children: inline
line 0 width: 9.34375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 1, length: 1, rect: [28.296875,10 9.34375x17.46875]
BlockContainer <td> at (28.296875,10) content-size 20.40625x34 table-cell [BFC] children: inline
line 0 width: 9.34375, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 1, length: 1, rect: [28.296875,10 9.34375x17]
"B"
line 1 width: 10.3125, height: 17.9375, bottom: 35.40625, baseline: 13.53125
frag 0 from TextNode start: 0, length: 1, rect: [28.296875,27 10.3125x17.46875]
line 1 width: 10.3125, height: 17, bottom: 34, baseline: 13.296875
frag 0 from TextNode start: 0, length: 1, rect: [28.296875,27 10.3125x17]
"C"
TextNode <#text>
BreakNode <br>
TextNode <#text>
BlockContainer <(anonymous)> (not painted) children: inline
TextNode <#text>
BlockContainer <td> at (52.703125,18.96875) content-size 14.296875x17.46875 table-cell [BFC] children: inline
line 0 width: 11.140625, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 1, length: 1, rect: [52.703125,18.96875 11.140625x17.46875]
BlockContainer <td> at (52.703125,18.5) content-size 14.296875x17 table-cell [BFC] children: inline
line 0 width: 11.140625, height: 17, bottom: 17, baseline: 13.296875
frag 0 from TextNode start: 1, length: 1, rect: [52.703125,18.5 11.140625x17]
"D"
TextNode <#text>
BlockContainer <(anonymous)> (not painted) children: inline
@ -44,15 +44,15 @@ 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 784x39.40625]
PaintableWithLines (TableWrapper(anonymous)) [8,8 61x39.40625]
PaintableBox (Box<TABLE>) [8,8 61x39.40625]
PaintableBox (Box<TBODY>) [8,8 61x39.40625]
PaintableBox (Box<TR>) [8,8 61x39.40625]
PaintableWithLines (BlockContainer<TD>) [8,8 18.296875x39.40625]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x38]
PaintableWithLines (TableWrapper(anonymous)) [8,8 61x38]
PaintableBox (Box<TABLE>) [8,8 61x38]
PaintableBox (Box<TBODY>) [8,8 61x38]
PaintableBox (Box<TR>) [8,8 61x38]
PaintableWithLines (BlockContainer<TD>) [8,8 18.296875x38]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<TD>) [26.296875,8 24.40625x39.40625]
PaintableWithLines (BlockContainer<TD>) [26.296875,8 24.40625x38]
TextPaintable (TextNode<#text>)
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer<TD>) [50.703125,8 18.296875x39.40625]
PaintableWithLines (BlockContainer<TD>) [50.703125,8 18.296875x38]
TextPaintable (TextNode<#text>)