jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
3 * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
4 *
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8#include <LibWeb/HTML/Parser/HTMLParser.h>
9#include <LibWeb/Layout/ReplacedBox.h>
10#include <LibWeb/Layout/SVGGeometryBox.h>
11#include <LibWeb/Painting/SVGSVGPaintable.h>
12
13namespace Web::Layout {
14
15SVGSVGBox::SVGSVGBox(DOM::Document& document, SVG::SVGSVGElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
16 : ReplacedBox(document, element, move(properties))
17{
18}
19
20JS::GCPtr<Painting::Paintable> SVGSVGBox::create_paintable() const
21{
22 return Painting::SVGSVGPaintable::create(*this);
23}
24
25void SVGSVGBox::prepare_for_replaced_layout()
26{
27 if (dom_node().has_attribute(HTML::AttributeNames::width) && dom_node().has_attribute(HTML::AttributeNames::height)) {
28 Optional<CSSPixels> w;
29 Optional<CSSPixels> h;
30 if (auto width = HTML::parse_dimension_value(dom_node().attribute(HTML::AttributeNames::width))) {
31 if (width->has_length())
32 w = width->to_length().to_px(*this);
33 }
34 if (auto height = HTML::parse_dimension_value(dom_node().attribute(HTML::AttributeNames::height))) {
35 if (height->has_length())
36 h = height->to_length().to_px(*this);
37 }
38 if (w.has_value() && h.has_value()) {
39 set_intrinsic_width(*w);
40 set_intrinsic_height(*h);
41 set_intrinsic_aspect_ratio(w->value() / h->value());
42 return;
43 }
44 }
45
46 Optional<CSSPixelRect> united_rect;
47
48 auto add_to_united_rect = [&](CSSPixelRect const& rect) {
49 if (united_rect.has_value())
50 united_rect = united_rect->united(rect);
51 else
52 united_rect = rect;
53 };
54
55 for_each_in_subtree_of_type<SVGGeometryBox>([&](SVGGeometryBox const& geometry_box) {
56 auto& dom_node = const_cast<SVG::SVGGeometryElement&>(geometry_box.dom_node());
57 if (dom_node.has_attribute(HTML::AttributeNames::width) && dom_node.has_attribute(HTML::AttributeNames::height)) {
58 CSSPixelRect rect;
59 // FIXME: Allow for relative lengths here
60 rect.set_width(computed_values().width().resolved(*this, CSS::Length::make_px(0)).to_px(*this));
61 rect.set_height(computed_values().height().resolved(*this, CSS::Length::make_px(0)).to_px(*this));
62 add_to_united_rect(rect);
63 return IterationDecision::Continue;
64 }
65
66 auto& path = dom_node.get_path();
67 auto path_bounding_box = path.bounding_box().to_type<CSSPixels>();
68
69 // Stroke increases the path's size by stroke_width/2 per side.
70 auto stroke_width = geometry_box.dom_node().stroke_width().value_or(0);
71 path_bounding_box.inflate(stroke_width, stroke_width);
72
73 auto& maybe_view_box = this->dom_node().view_box();
74
75 if (maybe_view_box.has_value()) {
76 auto view_box = maybe_view_box.value();
77 CSSPixelRect rect(view_box.min_x, view_box.min_y, view_box.width, view_box.height);
78 add_to_united_rect(rect);
79 return IterationDecision::Continue;
80 }
81
82 add_to_united_rect(path_bounding_box);
83 return IterationDecision::Continue;
84 });
85
86 if (united_rect.has_value()) {
87 set_intrinsic_width(united_rect->width());
88 set_intrinsic_height(united_rect->height());
89 set_intrinsic_aspect_ratio(united_rect->width().value() / united_rect->height().value());
90 }
91}
92
93}