Add CSSValue types for the shape() function

[smfr]

5b3fbae

Add CSSValue types for the shape() function
https://bugs.webkit.org/show_bug.cgi?id=277211
rdar://132644760

Reviewed by Tim Nguyen.

To support the CSS shape() function[1] we need two new CSSValue subclasses.

CSSShapeValue subclasses CSSValueContainingVector, since the segments form a list.
Those segments are represented by CSSShapeSegmentValue. The spec calls these "commands",
but I chose to use "segment" to match terminology in Path and SVG code.

Internally CSSShapeSegmentValue uses one of several data types to store the segment
data, based on how many lengths or points need to be stored.

These classes are not yet instantiated.

Based on code by Noam Rosenthal.

[1] https://drafts.csswg.org/css-shapes-2/#shape-function

* Source/WebCore/Sources.txt:
* Source/WebCore/WebCore.xcodeproj/project.pbxproj:
* Source/WebCore/css/CSSBasicShapes.cpp:
(WebCore::CSSPolygonValue::CSSPolygonValue): Use r-value reference for the CSSValueListBuilder argument.
(WebCore::CSSPolygonValue::create):
(WebCore::CSSShapeValue::create):
(WebCore::CSSShapeValue::CSSShapeValue):
(WebCore::CSSShapeValue::customCSSText const):
(WebCore::CSSShapeValue::equals const):
* Source/WebCore/css/CSSBasicShapes.h:
* Source/WebCore/css/CSSShapeSegmentValue.cpp: Added.
(WebCore::CSSShapeSegmentValue::createMove):
(WebCore::CSSShapeSegmentValue::createLine):
(WebCore::CSSShapeSegmentValue::createHorizontalLine):
(WebCore::CSSShapeSegmentValue::createVerticalLine):
(WebCore::CSSShapeSegmentValue::createCubicCurve):
(WebCore::CSSShapeSegmentValue::createQuadraticCurve):
(WebCore::CSSShapeSegmentValue::createSmoothCubicCurve):
(WebCore::CSSShapeSegmentValue::createSmoothQuadraticCurve):
(WebCore::CSSShapeSegmentValue::createArc):
(WebCore::CSSShapeSegmentValue::createClose):
(WebCore::CSSShapeSegmentValue::equals const):
(WebCore::CSSShapeSegmentValue::customCSSText const):
* Source/WebCore/css/CSSShapeSegmentValue.h: Added.
(WebCore::CSSShapeSegmentValue::type const):
(WebCore::CSSShapeSegmentValue::ShapeSegmentData::ShapeSegmentData):
(WebCore::CSSShapeSegmentValue::ShapeSegmentData::operator== const):
(WebCore::CSSShapeSegmentValue::OnePointData::OnePointData):
(WebCore::CSSShapeSegmentValue::TwoPointData::TwoPointData):
(WebCore::CSSShapeSegmentValue::ArcData::ArcData):
(WebCore::CSSShapeSegmentValue::create):
(WebCore::CSSShapeSegmentValue::CSSShapeSegmentValue):
* Source/WebCore/css/CSSValue.cpp:
(WebCore::CSSValue::visitDerived):
* Source/WebCore/css/CSSValue.h:
(WebCore::CSSValue::isShape const):
(WebCore::CSSValue::isShapeSegment const):
* Source/WebCore/css/CSSValueKeywords.in: Add shape-related keywords.
* Source/WebCore/rendering/style/BasicShapes.h:

Canonical link: https://commits.webkit.org/281462@main

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✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 wincairo-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	❌ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2
	✅ 🛠 tv
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[webkit-commit-queue]

Committed 281462@main (5b3fbae): https://commits.webkit.org/281462@main

Reviewed commits have been landed. Closing PR #31352 and removing active labels.