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LibWeb: Interpolate polygon() function by computed value

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Tim Ledbetter 2025-09-13 14:14:49 +01:00 • committed by Sam Atkins
commit 4a0fe65923
Notes: github-actions[bot] 2025-09-15 09:36:13 +00:00
3 changed files with 80 additions and 58 deletions
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22
Libraries/LibWeb/CSS/Interpolation.cpp
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@ -1239,6 +1239,28 @@ static RefPtr<StyleValue const> interpolate_value_impl(DOM::Element& element, Ca
return {};
return Rect { *interpolated_rect_box };
},
[&](Polygon const& from_polygon) -> Optional<BasicShape> {
// If both shapes are of type polygon(), both polygons have the same number of vertices, and use the
// same <'fill-rule'>, interpolate between each value in the shape functions.
auto const& to_polygon = to_shape.get<Polygon>();
if (from_polygon.fill_rule != to_polygon.fill_rule)
return {};
if (from_polygon.points.size() != to_polygon.points.size())
return {};
Vector<Polygon::Point> interpolated_points;
interpolated_points.ensure_capacity(from_polygon.points.size());
for (size_t i = 0; i < from_polygon.points.size(); i++) {
auto const& from_point = from_polygon.points[i];
auto const& to_point = to_polygon.points[i];
auto interpolated_point_x = interpolate_length_percentage(calculation_context, from_point.x, to_point.x, delta);
auto interpolated_point_y = interpolate_length_percentage(calculation_context, from_point.y, to_point.y, delta);
if (!interpolated_point_x.has_value() || !interpolated_point_y.has_value())
return {};
interpolated_points.unchecked_append(Polygon::Point { *interpolated_point_x, *interpolated_point_y });
}
return Polygon { from_polygon.fill_rule, move(interpolated_points) };
},
[](auto&) -> Optional<BasicShape> {
return {};
});