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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/Layout/BlockFormattingContext.h>
#include <LibWeb/Layout/SVGFormattingContext.h>
#include <LibWeb/Layout/SVGGeometryBox.h>
#include <LibWeb/SVG/SVGForeignObjectElement.h>
#include <LibWeb/SVG/SVGSVGElement.h>
namespace Web::Layout {
SVGFormattingContext::SVGFormattingContext(LayoutState& state, Box const& box, FormattingContext* parent)
: FormattingContext(Type::SVG, state, box, parent)
{
}
SVGFormattingContext::~SVGFormattingContext() = default;
CSSPixels SVGFormattingContext::automatic_content_width() const
{
return 0;
}
CSSPixels SVGFormattingContext::automatic_content_height() const
{
return 0;
}
void SVGFormattingContext::run(Box const& box, LayoutMode, [[maybe_unused]] AvailableSpace const& available_space)
{
// FIXME: This entire thing is an ad-hoc hack.
auto& svg_svg_element = verify_cast<SVG::SVGSVGElement>(*box.dom_node());
auto svg_box_state = m_state.get(box);
auto root_offset = svg_box_state.offset;
box.for_each_child_of_type<BlockContainer>([&](BlockContainer const& child_box) {
if (is<SVG::SVGForeignObjectElement>(child_box.dom_node())) {
Layout::BlockFormattingContext bfc(m_state, child_box, this);
bfc.run(child_box, LayoutMode::Normal, available_space);
auto& child_state = m_state.get_mutable(child_box);
child_state.set_content_offset(child_state.offset.translated(root_offset));
}
return IterationDecision::Continue;
});
box.for_each_in_subtree_of_type<SVGBox>([&](SVGBox const& descendant) {
if (is<SVGGeometryBox>(descendant)) {
auto const& geometry_box = static_cast<SVGGeometryBox const&>(descendant);
auto& geometry_box_state = m_state.get_mutable(geometry_box);
auto& dom_node = const_cast<SVGGeometryBox&>(geometry_box).dom_node();
auto& path = dom_node.get_path();
auto transform = dom_node.get_transform();
auto& maybe_view_box = svg_svg_element.view_box();
float viewbox_scale = 1.0f;
CSSPixelPoint offset {};
if (maybe_view_box.has_value()) {
auto view_box = maybe_view_box.value();
// FIXME: This should allow just one of width or height to be specified.
// E.g. We should be able to layout <svg width="100%"> where height is unspecified/auto.
if (!svg_box_state.has_definite_width() || !svg_box_state.has_definite_height()) {
dbgln("FIXME: Attempting to layout indefinitely sized SVG with a viewbox -- this likely won't work!");
}
auto scale_width = svg_box_state.has_definite_width() ? svg_box_state.content_width().value() / view_box.width : 1;
auto scale_height = svg_box_state.has_definite_height() ? svg_box_state.content_height().value() / view_box.height : 1;
viewbox_scale = min(scale_width, scale_height);
// Center the viewbox within the SVG element:
if (svg_box_state.has_definite_width())
offset.translate_by((svg_box_state.content_width() - (view_box.width * viewbox_scale)) / 2, 0);
if (svg_box_state.has_definite_height())
offset.translate_by(0, (svg_box_state.content_height() - (view_box.height * viewbox_scale)) / 2);
transform = Gfx::AffineTransform {}.scale(viewbox_scale, viewbox_scale).translate({ -view_box.min_x, -view_box.min_y }).multiply(transform);
}
// Stroke increases the path's size by stroke_width/2 per side.
auto path_bounding_box = transform.map(path.bounding_box()).to_type<CSSPixels>();
CSSPixels stroke_width = geometry_box.dom_node().visible_stroke_width() * viewbox_scale;
path_bounding_box.inflate(stroke_width, stroke_width);
geometry_box_state.set_content_offset(path_bounding_box.top_left() + offset);
geometry_box_state.set_content_width(path_bounding_box.width());
geometry_box_state.set_content_height(path_bounding_box.height());
}
return IterationDecision::Continue;
});
}
}
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