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LibWeb: Let Paintable perform the painting

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This patch adds a bunch of Paintable subclasses, each corresponding to
the Layout::Node subclasses that had a paint() override. All painting
logic is moved from layout nodes into their corresponding paintables.

Paintables are now created by asking a Layout::Box to produce one:

    static NonnullOwnPtr<Paintable> Layout::Box::create_paintable()

Note that inline nodes still have their painting logic. Since they
are not boxes, and all paintables have a corresponding box, we'll need
to come up with some other solution for them.
This commit is contained in:
Andreas Kling 2022-03-10 14:02:25 +01:00
parent f6497b64ac
commit 02b316fd5c
64 changed files with 1307 additions and 602 deletions
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122
Userland/Libraries/LibWeb/Painting/SVGGeometryPaintable.cpp Normal file
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/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/AntiAliasingPainter.h>
#include <LibWeb/Layout/ImageBox.h>
#include <LibWeb/Painting/SVGGeometryPaintable.h>
#include <LibWeb/SVG/SVGSVGElement.h>
namespace Web::Painting {
NonnullOwnPtr<SVGGeometryPaintable> SVGGeometryPaintable::create(Layout::SVGGeometryBox const& layout_box)
{
return adopt_own(*new SVGGeometryPaintable(layout_box));
}
SVGGeometryPaintable::SVGGeometryPaintable(Layout::SVGGeometryBox const& layout_box)
: SVGGraphicsPaintable(layout_box)
{
}
Layout::SVGGeometryBox const& SVGGeometryPaintable::layout_box() const
{
return static_cast<Layout::SVGGeometryBox const&>(m_layout_box);
}
void SVGGeometryPaintable::paint(PaintContext& context, PaintPhase phase) const
{
if (!is_visible())
return;
SVGGraphicsPaintable::paint(context, phase);
if (phase != PaintPhase::Foreground)
return;
auto& geometry_element = layout_box().dom_node();
Gfx::AntiAliasingPainter painter { context.painter() };
auto& svg_context = context.svg_context();
auto offset = svg_context.svg_element_position();
painter.translate(offset);
auto const* svg_element = geometry_element.first_ancestor_of_type<SVG::SVGSVGElement>();
auto maybe_view_box = svg_element->view_box();
context.painter().add_clip_rect(enclosing_int_rect(absolute_rect()));
Gfx::Path path = const_cast<SVG::SVGGeometryElement&>(geometry_element).get_path();
if (maybe_view_box.has_value()) {
Gfx::Path new_path;
auto scaling = layout_box().viewbox_scaling();
auto origin = layout_box().viewbox_origin();
auto transform_point = [&scaling, &origin](Gfx::FloatPoint const& point) -> Gfx::FloatPoint {
auto new_point = point;
new_point.translate_by({ -origin.x(), -origin.y() });
new_point.scale_by(scaling);
return new_point;
};
for (auto& segment : path.segments()) {
switch (segment.type()) {
case Gfx::Segment::Type::Invalid:
break;
case Gfx::Segment::Type::MoveTo:
new_path.move_to(transform_point(segment.point()));
break;
case Gfx::Segment::Type::LineTo:
new_path.line_to(transform_point(segment.point()));
break;
case Gfx::Segment::Type::QuadraticBezierCurveTo: {
auto& quadratic_bezier_segment = static_cast<Gfx::QuadraticBezierCurveSegment const&>(segment);
new_path.quadratic_bezier_curve_to(transform_point(quadratic_bezier_segment.through()), transform_point(quadratic_bezier_segment.point()));
break;
}
case Gfx::Segment::Type::CubicBezierCurveTo: {
auto& cubic_bezier_segment = static_cast<Gfx::CubicBezierCurveSegment const&>(segment);
new_path.cubic_bezier_curve_to(transform_point(cubic_bezier_segment.through_0()), transform_point(cubic_bezier_segment.through_1()), transform_point(cubic_bezier_segment.point()));
break;
}
case Gfx::Segment::Type::EllipticalArcTo: {
auto& elliptical_arc_segment = static_cast<Gfx::EllipticalArcSegment const&>(segment);
new_path.elliptical_arc_to(transform_point(elliptical_arc_segment.point()), elliptical_arc_segment.radii().scaled(scaling, scaling), elliptical_arc_segment.x_axis_rotation(), false, false);
break;
}
}
}
path = new_path;
}
if (auto fill_color = geometry_element.fill_color().value_or(svg_context.fill_color()); fill_color.alpha() > 0) {
// We need to fill the path before applying the stroke, however the filled
// path must be closed, whereas the stroke path may not necessary be closed.
// Copy the path and close it for filling, but use the previous path for stroke
auto closed_path = path;
closed_path.close();
// Fills are computed as though all paths are closed (https://svgwg.org/svg2-draft/painting.html#FillProperties)
painter.fill_path(
closed_path,
fill_color,
Gfx::Painter::WindingRule::EvenOdd);
}
if (auto stroke_color = geometry_element.stroke_color().value_or(svg_context.stroke_color()); stroke_color.alpha() > 0) {
painter.stroke_path(
path,
stroke_color,
geometry_element.stroke_width().value_or(svg_context.stroke_width()));
}
painter.translate(-offset);
context.painter().clear_clip_rect();
}
}