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LibWeb: Layout SVG <text> elements during layout (not while painting)

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Previously, all SVG <text> elements were zero-sized boxes, that were
only actually positioned and sized during painting. This led to a number
of problems, the most visible of which being that text could not be
scaled based on the viewBox.

Which this patch, <text> elements get a correctly sized layout box,
that can be hit-tested and respects the SVG viewBox.

To share code with SVGGeometryElement's the PathData (from the prior
commit) has been split into a computed path and computed transforms.
The computed path is specific to geometry elements, but the computed
transforms are shared between all SVG graphics elements.
This commit is contained in:
MacDue 2023-10-29 19:11:46 +00:00 • committed by Alexander Kalenik
parent dc9cb449b1
commit c93d367d95
16 changed files with 209 additions and 173 deletions
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2
Tests/LibWeb/Layout/expected/css-namespace-tag-name-selector.txt
View file

@ -9,7 +9,7 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
frag 2 from Box start: 0, length: 0, rect: [319,51 0x108]
SVGSVGBox <svg> at (9,9) content-size 300x150 [SVG] children: inline
InlineNode <a>
SVGTextBox <text> at (9,9) content-size 0x0 children: inline
SVGTextBox <text> at (29,9) content-size 198.90625x80 children: inline
TextNode <#text>
TextNode <#text>
Box <math> at (319,51) content-size 0x108 children: not-inline

30
Tests/LibWeb/Layout/expected/svg-text-with-viewbox.txt Normal file
View file

@ -0,0 +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 784x261.328125 children: inline
line 0 width: 784, height: 261.328125, bottom: 261.328125, baseline: 261.328125
frag 0 from SVGSVGBox start: 0, length: 0, rect: [8,8 784x261.328125]
SVGSVGBox <svg> at (8,8) content-size 784x261.328125 [SVG] children: inline
TextNode <#text>
TextNode <#text>
SVGTextBox <text.small> at (73.34375,79.859375) content-size 50.265625x42.46875 children: inline
TextNode <#text>
TextNode <#text>
SVGTextBox <text.heavy> at (138.6875,24.328125) content-size 153.703125x98 children: inline
TextNode <#text>
TextNode <#text>
SVGTextBox <text.small> at (187.671875,145.1875) content-size 36.90625x42.46875 children: inline
TextNode <#text>
TextNode <#text>
SVGTextBox <text.Rrrrr> at (220.34375,57) content-size 526.609375x130.65625 children: inline
TextNode <#text>
TextNode <#text>
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x261.328125]
SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x261.328125]
SVGTextPaintable (SVGTextBox<text>.small) [73.34375,79.859375 50.265625x42.46875]
SVGTextPaintable (SVGTextBox<text>.heavy) [138.6875,24.328125 153.703125x98]
SVGTextPaintable (SVGTextBox<text>.small) [187.671875,145.1875 36.90625x42.46875]
SVGTextPaintable (SVGTextBox<text>.Rrrrr) [220.34375,57 526.609375x130.65625]

6
Tests/LibWeb/Layout/expected/svg/text-fill-none.txt
View file

@ -4,11 +4,11 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
line 0 width: 300, height: 150, bottom: 150, baseline: 150
frag 0 from SVGSVGBox start: 0, length: 0, rect: [8,8 300x150]
SVGSVGBox <svg> at (8,8) content-size 300x150 [SVG] children: not-inline
SVGTextBox <text> at (8,8) content-size 0x0 children: not-inline
SVGTextBox <text> at (8,-8) content-size 0x16 children: not-inline
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x150]
SVGSVGPaintable (SVGSVGBox<svg>) [8,8 300x150]
SVGTextPaintable (SVGTextBox<text>) [8,8 0x0]
SVGSVGPaintable (SVGSVGBox<svg>) [8,8 300x150] overflow: [8,-8 300x166]
SVGTextPaintable (SVGTextBox<text>) [8,-8 0x16]

20
Tests/LibWeb/Layout/input/svg-text-with-viewbox.html Normal file
View file

@ -0,0 +1,20 @@
<svg viewBox="0 0 240 80" xmlns="http://www.w3.org/2000/svg">
<style>
.small {
font: italic 13px sans-serif;
}
.heavy {
font: bold 30px sans-serif;
}
.Rrrrr {
font: italic 40px serif;
fill: red;
}
</style>
<text x="20" y="35" class="small">My</text>
<text x="40" y="35" class="heavy">cat</text>
<text x="55" y="55" class="small">is</text>
<text x="65" y="55" class="Rrrrr">Grumpy!</text>
</svg>
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