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LibWeb: Apply SVG transform to path when painting (SVG) elements
This also combines the viewbox mapping into the same transform and reuses some code by using Path::copy_transformed() rather than manually mapping each segment of the path.
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3 changed files with 27 additions and 67 deletions
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@ -17,27 +17,6 @@ SVGGeometryBox::SVGGeometryBox(DOM::Document& document, SVG::SVGGeometryElement&
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{
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}
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float SVGGeometryBox::viewbox_scaling() const
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{
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auto* svg_box = dom_node().first_ancestor_of_type<SVG::SVGSVGElement>();
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if (!svg_box || !svg_box->view_box().has_value())
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return 1;
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auto view_box = svg_box->view_box().value();
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bool has_specified_width = svg_box->has_attribute(HTML::AttributeNames::width);
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auto specified_width = paint_box()->content_width().value();
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bool has_specified_height = svg_box->has_attribute(HTML::AttributeNames::height);
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auto specified_height = paint_box()->content_height().value();
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auto scale_width = has_specified_width ? specified_width / view_box.width : 1;
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auto scale_height = has_specified_height ? specified_height / view_box.height : 1;
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return min(scale_width, scale_height);
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}
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CSSPixelPoint SVGGeometryBox::viewbox_origin() const
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{
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auto* svg_box = dom_node().first_ancestor_of_type<SVG::SVGSVGElement>();
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@ -46,6 +25,28 @@ CSSPixelPoint SVGGeometryBox::viewbox_origin() const
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return { svg_box->view_box().value().min_x, svg_box->view_box().value().min_y };
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}
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Gfx::AffineTransform SVGGeometryBox::layout_transform() const
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{
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auto& geometry_element = dom_node();
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auto transform = geometry_element.get_transform();
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auto* svg_box = geometry_element.first_ancestor_of_type<SVG::SVGSVGElement>();
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float scaling = 1;
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auto origin = viewbox_origin().to_type<float>();
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Gfx::FloatPoint paint_offset = {};
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if (svg_box && svg_box->view_box().has_value()) {
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// Note: SVGFormattingContext has already done the scaling based on the viewbox,
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// we now have to derive what it was from the original bounding box size.
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// FIXME: It would be nice if we could store the transform from layout somewhere, so we don't have to solve for it here.
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auto scaled_width = paint_box()->content_width().value();
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auto scaled_height = paint_box()->content_height().value();
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auto original_bounding_box = Gfx::AffineTransform {}.translate(-origin).multiply(transform).map(const_cast<SVG::SVGGeometryElement&>(geometry_element).get_path().bounding_box());
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scaling = min(scaled_width / original_bounding_box.width(), scaled_height / original_bounding_box.height());
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auto scaled_bounding_box = original_bounding_box.scaled(scaling, scaling);
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paint_offset = (paint_box()->absolute_rect().location() - svg_box->paint_box()->absolute_rect().location()).to_type<float>() - scaled_bounding_box.location();
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}
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return Gfx::AffineTransform {}.translate(paint_offset).scale(scaling, scaling).translate(-origin).multiply(transform);
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}
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JS::GCPtr<Painting::Paintable> SVGGeometryBox::create_paintable() const
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{
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return Painting::SVGGeometryPaintable::create(*this);
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