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LibWeb: Store computed SVG path data/transforms in LayoutState

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This removes the awkward hack to recompute the layout transform at paint
time, and makes it possible for path sizes to be computed during layout.

For example, it's possible to use relative units in SVG shapes (e.g.
<rect>), which can be resolved during layout, but would be hard to
resolve again during painting.
This commit is contained in:
MacDue 2023-10-29 17:08:35 +00:00 • committed by Alexander Kalenik
parent 19313945f2
commit dc9cb449b1
12 changed files with 76 additions and 69 deletions
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37
Userland/Libraries/LibWeb/Layout/SVGGeometryBox.cpp
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@ -17,43 +17,6 @@ SVGGeometryBox::SVGGeometryBox(DOM::Document& document, SVG::SVGGeometryElement&
{
}
CSSPixelPoint SVGGeometryBox::viewbox_origin() const
{
auto* svg_box = dom_node().shadow_including_first_ancestor_of_type<SVG::SVGSVGElement>();
if (!svg_box || !svg_box->view_box().has_value())
return { 0, 0 };
return { svg_box->view_box().value().min_x, svg_box->view_box().value().min_y };
}
Optional<Gfx::AffineTransform> SVGGeometryBox::layout_transform(Gfx::AffineTransform additional_svg_transform) const
{
auto& geometry_element = dom_node();
auto transform = geometry_element.get_transform();
auto* svg_box = geometry_element.shadow_including_first_ancestor_of_type<SVG::SVGSVGElement>();
double scaling = 1;
auto origin = viewbox_origin().to_type<float>();
Gfx::FloatPoint paint_offset = {};
if (svg_box && geometry_element.view_box().has_value()) {
// Note: SVGFormattingContext has already done the scaling based on the viewbox,
// we now have to derive what it was from the original bounding box size.
// FIXME: It would be nice if we could store the transform from layout somewhere, so we don't have to solve for it here.
auto original_bounding_box = Gfx::AffineTransform {}.translate(-origin).multiply(transform).map(const_cast<SVG::SVGGeometryElement&>(geometry_element).get_path().bounding_box());
float stroke_width = geometry_element.visible_stroke_width();
original_bounding_box.inflate(stroke_width, stroke_width);
// If the transform (or path) results in a empty box we can't display this.
if (original_bounding_box.is_empty())
return {};
auto scaled_width = paintable_box()->content_width().to_double();
auto scaled_height = paintable_box()->content_height().to_double();
scaling = min(scaled_width / static_cast<double>(original_bounding_box.width()), scaled_height / static_cast<double>(original_bounding_box.height()));
auto scaled_bounding_box = original_bounding_box.scaled(scaling, scaling);
paint_offset = (paintable_box()->absolute_rect().location() - svg_box->paintable_box()->absolute_rect().location()).to_type<float>() - scaled_bounding_box.location();
}
// Note: The "additional_svg_transform" is applied during mask painting to transform the mask element to match its target.
// It has to be applied while still in the SVG coordinate space.
return Gfx::AffineTransform {}.translate(paint_offset).scale(scaling, scaling).translate(-origin).multiply(additional_svg_transform).multiply(transform);
}
JS::GCPtr<Painting::Paintable> SVGGeometryBox::create_paintable() const
{
return Painting::SVGGeometryPaintable::create(*this);