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LibWeb: Add initial support for nesting SVG viewports

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Previously, we were handling viewBoxes/viewports in a slightly hacky
way, asking graphics elements to figure out what viewBox to use during
layout. This does not work in all cases, and can't allow for more
complex SVGs where it is possible to have nested viewports.

This commit makes the SVGFormattingContext keep track of the
viewport/boxes, and it now lays out each viewport recursively, where
each nested `<svg>` or `<symbol>` can establish a new viewport.

This fixes some previous edge cases, and starts to allow nested
viewports (there's still some issues to resolve there).

Fixes #22931
This commit is contained in:
MacDue 2024-01-27 16:23:22 +00:00 • committed by Andreas Kling
parent 546143e9a6
commit 5cf1570f40
13 changed files with 229 additions and 67 deletions
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21
Tests/LibWeb/Layout/expected/svg/use-honor-outer-viewBox.txt Normal file
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@ -0,0 +1,21 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x118 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x102 children: inline
frag 0 from SVGSVGBox start: 0, length: 0, rect: [9,9 100x100] baseline: 102
SVGSVGBox <svg#outer> at (9,9) content-size 100x100 [SVG] children: inline
TextNode <#text>
Box <use> at (9,9) content-size 100x100 children: inline
SVGSVGBox <svg#whee> at (9,9) content-size 100x100 [SVG] children: inline
TextNode <#text>
SVGGeometryBox <rect> at (9,9) content-size 50x50 children: inline
TextNode <#text>
TextNode <#text>
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x118]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x102]
SVGSVGPaintable (SVGSVGBox<svg>#outer) [8,8 102x102]
PaintableBox (Box<use>) [9,9 100x100]
SVGSVGPaintable (SVGSVGBox<svg>#whee) [9,9 100x100]
SVGPathPaintable (SVGGeometryBox<rect>) [9,9 50x50]