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ladybird/Userland/Libraries/LibWeb/Painting/BorderPainting.cpp

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/CircularQueue.h>
#include <LibGfx/AntiAliasingPainter.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/Layout/Node.h>
namespace Web::Painting {
static constexpr double dark_light_absolute_value_difference = 1. / 3;
static Color light_color_for_inset_and_outset(Color const& color)
{
auto hsv = color.to_hsv();
if (hsv.value >= dark_light_absolute_value_difference)
return Color::from_hsv(hsv);
return Color::from_hsv({ hsv.hue, hsv.saturation, hsv.value + dark_light_absolute_value_difference });
}
static Color dark_color_for_inset_and_outset(Color const& color)
{
auto hsv = color.to_hsv();
if (hsv.value < dark_light_absolute_value_difference)
return Color::from_hsv(hsv);
return Color::from_hsv({ hsv.hue, hsv.saturation, hsv.value - dark_light_absolute_value_difference });
}
Gfx::Color border_color(BorderEdge edge, BordersDataDevicePixels const& borders_data)
{
auto const& border_data = [&] {
switch (edge) {
case BorderEdge::Top:
return borders_data.top;
case BorderEdge::Right:
return borders_data.right;
case BorderEdge::Bottom:
return borders_data.bottom;
case BorderEdge::Left:
return borders_data.left;
default:
VERIFY_NOT_REACHED();
}
}();
if (border_data.line_style == CSS::LineStyle::Inset) {
auto top_left_color = dark_color_for_inset_and_outset(border_data.color);
auto bottom_right_color = light_color_for_inset_and_outset(border_data.color);
return (edge == BorderEdge::Left || edge == BorderEdge::Top) ? top_left_color : bottom_right_color;
} else if (border_data.line_style == CSS::LineStyle::Outset) {
auto top_left_color = light_color_for_inset_and_outset(border_data.color);
auto bottom_right_color = dark_color_for_inset_and_outset(border_data.color);
return (edge == BorderEdge::Left || edge == BorderEdge::Top) ? top_left_color : bottom_right_color;
}
return border_data.color;
}
void paint_border(Gfx::Painter& painter, BorderEdge edge, DevicePixelRect const& rect, Gfx::AntiAliasingPainter::CornerRadius const& radius, Gfx::AntiAliasingPainter::CornerRadius const& opposite_radius, BordersDataDevicePixels const& borders_data, Gfx::Path& path, bool last)
{
auto const& border_data = [&] {
switch (edge) {
case BorderEdge::Top:
return borders_data.top;
case BorderEdge::Right:
return borders_data.right;
case BorderEdge::Bottom:
return borders_data.bottom;
default: // BorderEdge::Left:
return borders_data.left;
}
}();
if (border_data.width <= 0)
return;
auto color = border_color(edge, borders_data);
auto border_style = border_data.line_style;
struct Points {
DevicePixelPoint p1;
DevicePixelPoint p2;
};
auto points_for_edge = [](BorderEdge edge, DevicePixelRect const& rect) -> Points {
switch (edge) {
case BorderEdge::Top:
return { rect.top_left(), rect.top_right().moved_left(1) };
case BorderEdge::Right:
return { rect.top_right().moved_left(1), rect.bottom_right().translated(-1) };
case BorderEdge::Bottom:
return { rect.bottom_left().moved_up(1), rect.bottom_right().translated(-1) };
default: // Edge::Left
return { rect.top_left(), rect.bottom_left().moved_up(1) };
}
};
auto gfx_line_style = Gfx::Painter::LineStyle::Solid;
switch (border_style) {
case CSS::LineStyle::None:
case CSS::LineStyle::Hidden:
return;
case CSS::LineStyle::Dotted:
gfx_line_style = Gfx::Painter::LineStyle::Dotted;
break;
case CSS::LineStyle::Dashed:
gfx_line_style = Gfx::Painter::LineStyle::Dashed;
break;
case CSS::LineStyle::Solid:
gfx_line_style = Gfx::Painter::LineStyle::Solid;
break;
case CSS::LineStyle::Double:
case CSS::LineStyle::Groove:
case CSS::LineStyle::Ridge:
case CSS::LineStyle::Inset:
case CSS::LineStyle::Outset:
// FIXME: Implement these
break;
}
if (gfx_line_style != Gfx::Painter::LineStyle::Solid) {
auto [p1, p2] = points_for_edge(edge, rect);
switch (edge) {
case BorderEdge::Top:
p1.translate_by(border_data.width / 2, border_data.width / 2);
p2.translate_by(-border_data.width / 2, border_data.width / 2);
break;
case BorderEdge::Right:
p1.translate_by(-border_data.width / 2, border_data.width / 2);
p2.translate_by(-border_data.width / 2, -border_data.width / 2);
break;
case BorderEdge::Bottom:
p1.translate_by(border_data.width / 2, -border_data.width / 2);
p2.translate_by(-border_data.width / 2, -border_data.width / 2);
break;
case BorderEdge::Left:
p1.translate_by(border_data.width / 2, border_data.width / 2);
p2.translate_by(border_data.width / 2, -border_data.width / 2);
break;
}
if (border_style == CSS::LineStyle::Dotted) {
painter.draw_line(p1.to_type<int>(), p2.to_type<int>(), color, border_data.width.value(), gfx_line_style);
return;
}
painter.draw_line(p1.to_type<int>(), p2.to_type<int>(), color, border_data.width.value(), gfx_line_style);
return;
}
auto draw_border = [&](Vector<Gfx::FloatPoint> const& points, bool joined_corner_has_inner_corner, bool opposite_joined_corner_has_inner_corner, Gfx::FloatSize joined_inner_corner_offset, Gfx::FloatSize opposite_joined_inner_corner_offset, bool ready_to_draw) {
int current = 0;
path.move_to(points[current++]);
path.elliptical_arc_to(
points[current++],
Gfx::FloatSize(radius.horizontal_radius, radius.vertical_radius),
0,
false,
false);
path.line_to(points[current++]);
if (joined_corner_has_inner_corner) {
path.elliptical_arc_to(
points[current++],
Gfx::FloatSize(radius.horizontal_radius - joined_inner_corner_offset.width(), radius.vertical_radius - joined_inner_corner_offset.height()),
0,
false,
true);
}
path.line_to(points[current++]);
if (opposite_joined_corner_has_inner_corner) {
path.elliptical_arc_to(
points[current++],
Gfx::FloatSize(opposite_radius.horizontal_radius - opposite_joined_inner_corner_offset.width(), opposite_radius.vertical_radius - opposite_joined_inner_corner_offset.height()),
0,
false,
true);
}
path.line_to(points[current++]);
path.elliptical_arc_to(
points[current++],
Gfx::FloatSize(opposite_radius.horizontal_radius, opposite_radius.vertical_radius),
0,
false,
false);
// If joined borders have the same color, combine them to draw together.
if (ready_to_draw) {
path.close_all_subpaths();
Gfx::AntiAliasingPainter aa_painter(painter);
aa_painter.fill_path(path, color, Gfx::Painter::WindingRule::EvenOdd);
path.clear();
}
};
auto compute_midpoint = [&](int horizontal_radius, int vertical_radius, int joined_border_width) {
if (horizontal_radius == 0 && vertical_radius == 0) {
return Gfx::FloatPoint(0, 0);
}
if (joined_border_width == 0) {
switch (edge) {
case BorderEdge::Top:
case BorderEdge::Bottom:
return Gfx::FloatPoint(horizontal_radius, 0);
case BorderEdge::Right:
case BorderEdge::Left:
return Gfx::FloatPoint(0, vertical_radius);
default:
VERIFY_NOT_REACHED();
}
}
// FIXME: this middle point rule seems not exacly the same as main browsers
// compute the midpoint based on point whose tangent slope of 1
// https://math.stackexchange.com/questions/3325134/find-the-points-on-the-ellipse-where-the-slope-of-the-tangent-line-is-1
return Gfx::FloatPoint(
(horizontal_radius * horizontal_radius) / AK::sqrt(1.0f * horizontal_radius * horizontal_radius + vertical_radius * vertical_radius),
(vertical_radius * vertical_radius) / AK::sqrt(1.0f * horizontal_radius * horizontal_radius + vertical_radius * vertical_radius));
};
/**
* 0 /-------------\ 7
* / /-----------\ \
* /-/ 3 4 \-\
* 1 2 5 6
* For each border edge, need to compute 8 points at most, then paint them as closed path.
* 8 points are the most complicated case, it happens when the joined border width is not 0 and border radius larger than border width on both side.
* If border radius is smaller than the border width, then the inner corner of the border corner is a right angle.
*/
switch (edge) {
case BorderEdge::Top: {
auto joined_border_width = borders_data.left.width;
auto opposite_joined_border_width = borders_data.right.width;
bool joined_corner_has_inner_corner = border_data.width < radius.vertical_radius && joined_border_width < radius.horizontal_radius;
bool opposite_joined_corner_has_inner_corner = border_data.width < opposite_radius.vertical_radius && opposite_joined_border_width < opposite_radius.horizontal_radius;
Gfx::FloatPoint joined_corner_endpoint_offset;
Gfx::FloatPoint opposite_joined_border_corner_offset;
{
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius, joined_border_width.value());
joined_corner_endpoint_offset = Gfx::FloatPoint(-midpoint.x(), radius.vertical_radius - midpoint.y());
}
{
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius, opposite_joined_border_width.value());
opposite_joined_border_corner_offset = Gfx::FloatPoint(midpoint.x(), opposite_radius.vertical_radius - midpoint.y());
}
Vector<Gfx::FloatPoint, 8> points;
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()));
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()) + joined_corner_endpoint_offset);
if (joined_corner_has_inner_corner) {
Gfx::FloatPoint midpoint = compute_midpoint(
radius.horizontal_radius - joined_border_width.value(),
radius.vertical_radius - border_data.width.value(),
joined_border_width.value());
Gfx::FloatPoint inner_corner_endpoint_offset = Gfx::FloatPoint(
-midpoint.x(),
radius.vertical_radius - border_data.width.value() - midpoint.y());
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()) + inner_corner_endpoint_offset);
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()));
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(
joined_border_width.value() - radius.horizontal_radius,
0);
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()) + inner_right_angle_offset);
}
if (opposite_joined_corner_has_inner_corner) {
Gfx::FloatPoint midpoint = compute_midpoint(
opposite_radius.horizontal_radius - opposite_joined_border_width.value(),
opposite_radius.vertical_radius - border_data.width.value(),
opposite_joined_border_width.value());
Gfx::FloatPoint inner_corner_endpoint_offset = Gfx::FloatPoint(
midpoint.x(),
opposite_radius.vertical_radius - border_data.width.value() - midpoint.y());
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()));
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()) + inner_corner_endpoint_offset);
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(
opposite_joined_border_width.value() - opposite_radius.horizontal_radius,
0);
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()) - inner_right_angle_offset);
}
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()) + opposite_joined_border_corner_offset);
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()));
draw_border(
points,
joined_corner_has_inner_corner,
opposite_joined_corner_has_inner_corner,
Gfx::FloatSize(joined_border_width.value(), border_data.width.value()),
Gfx::FloatSize(opposite_joined_border_width.value(), border_data.width.value()),
last || color != border_color(BorderEdge::Right, borders_data));
break;
}
case BorderEdge::Right: {
auto joined_border_width = borders_data.top.width;
auto opposite_joined_border_width = borders_data.bottom.width;
bool joined_corner_has_inner_corner = border_data.width < radius.horizontal_radius && joined_border_width < radius.vertical_radius;
bool opposite_joined_corner_has_inner_corner = border_data.width < opposite_radius.horizontal_radius && opposite_joined_border_width < opposite_radius.vertical_radius;
Gfx::FloatPoint joined_corner_endpoint_offset;
Gfx::FloatPoint opposite_joined_border_corner_offset;
{
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius, joined_border_width.value());
joined_corner_endpoint_offset = Gfx::FloatPoint(midpoint.x() - radius.horizontal_radius, -midpoint.y());
}
{
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius, opposite_joined_border_width.value());
opposite_joined_border_corner_offset = Gfx::FloatPoint(midpoint.x() - opposite_radius.horizontal_radius, midpoint.y());
}
Vector<Gfx::FloatPoint, 8> points;
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()));
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()) + joined_corner_endpoint_offset);
if (joined_corner_has_inner_corner) {
auto midpoint = compute_midpoint(
radius.horizontal_radius - border_data.width.value(),
radius.vertical_radius - joined_border_width.value(),
joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
-(radius.horizontal_radius - midpoint.x() - border_data.width.value()),
-midpoint.y());
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()) + inner_corner);
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()));
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(0, joined_border_width.value() - radius.horizontal_radius);
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()) + inner_right_angle_offset);
}
if (opposite_joined_corner_has_inner_corner) {
auto midpoint = compute_midpoint(
opposite_radius.horizontal_radius - border_data.width.value(),
opposite_radius.vertical_radius - opposite_joined_border_width.value(),
opposite_joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
-(opposite_radius.horizontal_radius - midpoint.x() - border_data.width.value()),
midpoint.y());
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()));
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()) + inner_corner);
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(0, opposite_joined_border_width.value() - opposite_radius.horizontal_radius);
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()) - inner_right_angle_offset);
}
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()) + opposite_joined_border_corner_offset);
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()));
draw_border(
points,
joined_corner_has_inner_corner,
opposite_joined_corner_has_inner_corner,
Gfx::FloatSize(border_data.width.value(), joined_border_width.value()),
Gfx::FloatSize(border_data.width.value(), opposite_joined_border_width.value()),
last || color != border_color(BorderEdge::Bottom, borders_data));
break;
}
case BorderEdge::Bottom: {
auto joined_border_width = borders_data.right.width;
auto opposite_joined_border_width = borders_data.left.width;
bool joined_corner_has_inner_corner = border_data.width < radius.vertical_radius && joined_border_width < radius.horizontal_radius;
bool opposite_joined_corner_has_inner_corner = border_data.width < opposite_radius.vertical_radius && opposite_joined_border_width < opposite_radius.horizontal_radius;
Gfx::FloatPoint joined_corner_endpoint_offset;
Gfx::FloatPoint opposite_joined_border_corner_offset;
{
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius, joined_border_width.value());
joined_corner_endpoint_offset = Gfx::FloatPoint(midpoint.x(), midpoint.y() - radius.vertical_radius);
}
{
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius, opposite_joined_border_width.value());
opposite_joined_border_corner_offset = Gfx::FloatPoint(-midpoint.x(), midpoint.y() - opposite_radius.vertical_radius);
}
Vector<Gfx::FloatPoint, 8> points;
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()));
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()) + joined_corner_endpoint_offset);
if (joined_corner_has_inner_corner) {
auto midpoint = compute_midpoint(
radius.horizontal_radius - joined_border_width.value(),
radius.vertical_radius - border_data.width.value(),
joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(midpoint.x(), -(radius.vertical_radius - midpoint.y() - border_data.width.value()));
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()) + inner_corner);
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()));
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(joined_border_width.value() - radius.horizontal_radius, 0);
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()) - inner_right_angle_offset);
}
if (opposite_joined_corner_has_inner_corner) {
auto midpoint = compute_midpoint(
opposite_radius.horizontal_radius - opposite_joined_border_width.value(),
opposite_radius.vertical_radius - border_data.width.value(),
opposite_joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
-midpoint.x(),
-(opposite_radius.vertical_radius - midpoint.y() - border_data.width.value()));
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()));
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()) + inner_corner);
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(opposite_joined_border_width.value() - opposite_radius.horizontal_radius, 0);
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()) + inner_right_angle_offset);
}
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()) + opposite_joined_border_corner_offset);
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()));
draw_border(
points,
joined_corner_has_inner_corner,
opposite_joined_corner_has_inner_corner,
Gfx::FloatSize(joined_border_width.value(), border_data.width.value()),
Gfx::FloatSize(opposite_joined_border_width.value(), border_data.width.value()),
last || color != border_color(BorderEdge::Left, borders_data));
break;
}
case BorderEdge::Left: {
auto joined_border_width = borders_data.bottom.width;
auto opposite_joined_border_width = borders_data.top.width;
bool joined_corner_has_inner_corner = border_data.width < radius.horizontal_radius && joined_border_width < radius.vertical_radius;
bool opposite_joined_corner_has_inner_corner = border_data.width < opposite_radius.horizontal_radius && opposite_joined_border_width < opposite_radius.vertical_radius;
Gfx::FloatPoint joined_corner_endpoint_offset;
Gfx::FloatPoint opposite_joined_border_corner_offset;
{
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius, joined_border_width.value());
joined_corner_endpoint_offset = Gfx::FloatPoint(radius.horizontal_radius - midpoint.x(), midpoint.y());
}
{
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius, opposite_joined_border_width.value());
opposite_joined_border_corner_offset = Gfx::FloatPoint(opposite_radius.horizontal_radius - midpoint.x(), -midpoint.y());
}
Vector<Gfx::FloatPoint, 8> points;
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()));
points.append(Gfx::FloatPoint(rect.bottom_left().to_type<int>()) + joined_corner_endpoint_offset);
if (joined_corner_has_inner_corner) {
auto midpoint = compute_midpoint(
radius.horizontal_radius - border_data.width.value(),
radius.vertical_radius - joined_border_width.value(),
joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(radius.horizontal_radius - border_data.width.value() - midpoint.x(), midpoint.y());
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()) + inner_corner);
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()));
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(0, joined_border_width.value() - radius.vertical_radius);
points.append(Gfx::FloatPoint(rect.bottom_right().to_type<int>()) - inner_right_angle_offset);
}
if (opposite_joined_corner_has_inner_corner) {
auto midpoint = compute_midpoint(
opposite_radius.horizontal_radius - border_data.width.value(),
opposite_radius.vertical_radius - opposite_joined_border_width.value(),
opposite_joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
opposite_radius.horizontal_radius - border_data.width.value() - midpoint.x(),
-midpoint.y());
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()));
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()) + inner_corner);
} else {
Gfx::FloatPoint inner_right_angle_offset = Gfx::FloatPoint(0, opposite_joined_border_width.value() - opposite_radius.vertical_radius);
points.append(Gfx::FloatPoint(rect.top_right().to_type<int>()) + inner_right_angle_offset);
}
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()) + opposite_joined_border_corner_offset);
points.append(Gfx::FloatPoint(rect.top_left().to_type<int>()));
draw_border(
points,
joined_corner_has_inner_corner,
opposite_joined_corner_has_inner_corner,
Gfx::FloatSize(border_data.width.value(), joined_border_width.value()),
Gfx::FloatSize(border_data.width.value(), opposite_joined_border_width.value()),
last || color != border_color(BorderEdge::Top, borders_data));
break;
}
}
}
void paint_all_borders(Gfx::Painter& painter, DevicePixelRect const& border_rect, CornerRadii const& corner_radii, BordersDataDevicePixels const& borders_data)
{
if (borders_data.top.width <= 0 && borders_data.right.width <= 0 && borders_data.left.width <= 0 && borders_data.bottom.width <= 0)
return;
auto top_left = corner_radii.top_left;
auto top_right = corner_radii.top_right;
auto bottom_right = corner_radii.bottom_right;
auto bottom_left = corner_radii.bottom_left;
// Disable border radii if the corresponding borders don't exist:
if (borders_data.bottom.width <= 0 && borders_data.left.width <= 0)
bottom_left = { 0, 0 };
if (borders_data.bottom.width <= 0 && borders_data.right.width <= 0)
bottom_right = { 0, 0 };
if (borders_data.top.width <= 0 && borders_data.left.width <= 0)
top_left = { 0, 0 };
if (borders_data.top.width <= 0 && borders_data.right.width <= 0)
top_right = { 0, 0 };
DevicePixelRect top_border_rect = {
border_rect.x() + top_left.horizontal_radius,
border_rect.y(),
border_rect.width() - top_left.horizontal_radius - top_right.horizontal_radius,
borders_data.top.width
};
DevicePixelRect right_border_rect = {
border_rect.x() + (border_rect.width() - borders_data.right.width),
border_rect.y() + top_right.vertical_radius,
borders_data.right.width,
border_rect.height() - top_right.vertical_radius - bottom_right.vertical_radius
};
DevicePixelRect bottom_border_rect = {
border_rect.x() + bottom_left.horizontal_radius,
border_rect.y() + (border_rect.height() - borders_data.bottom.width),
border_rect.width() - bottom_left.horizontal_radius - bottom_right.horizontal_radius,
borders_data.bottom.width
};
DevicePixelRect left_border_rect = {
border_rect.x(),
border_rect.y() + top_left.vertical_radius,
borders_data.left.width,
border_rect.height() - top_left.vertical_radius - bottom_left.vertical_radius
};
AK::CircularQueue<BorderEdge, 4> borders;
borders.enqueue(BorderEdge::Top);
borders.enqueue(BorderEdge::Right);
borders.enqueue(BorderEdge::Bottom);
borders.enqueue(BorderEdge::Left);
// Try to find the first border that has a different color than the previous one,
// then start painting from that border.
for (size_t i = 0; i < borders.size(); i++) {
if (border_color(borders.at(0), borders_data) != border_color(borders.at(1), borders_data)) {
borders.enqueue(borders.dequeue());
break;
}
borders.enqueue(borders.dequeue());
}
Gfx::Path path;
for (BorderEdge edge : borders) {
switch (edge) {
case BorderEdge::Top:
paint_border(painter, BorderEdge::Top, top_border_rect, top_left, top_right, borders_data, path, edge == borders.last());
break;
case BorderEdge::Right:
paint_border(painter, BorderEdge::Right, right_border_rect, top_right, bottom_right, borders_data, path, edge == borders.last());
break;
case BorderEdge::Bottom:
paint_border(painter, BorderEdge::Bottom, bottom_border_rect, bottom_right, bottom_left, borders_data, path, edge == borders.last());
break;
case BorderEdge::Left:
paint_border(painter, BorderEdge::Left, left_border_rect, bottom_left, top_left, borders_data, path, edge == borders.last());
break;
default:
VERIFY_NOT_REACHED();
}
}
}
Optional<BordersData> borders_data_for_outline(Layout::Node const& layout_node, Color outline_color, CSS::OutlineStyle outline_style, CSSPixels outline_width)
{
CSS::LineStyle line_style;
if (outline_style == CSS::OutlineStyle::Auto) {
// `auto` lets us do whatever we want for the outline. 2px of the link colour seems reasonable.
line_style = CSS::LineStyle::Dotted;
outline_color = layout_node.document().normal_link_color();
outline_width = 2;
} else {
line_style = CSS::value_id_to_line_style(CSS::to_value_id(outline_style)).value_or(CSS::LineStyle::None);
}
if (outline_color.alpha() == 0 || line_style == CSS::LineStyle::None || outline_width == 0)
return {};
CSS::BorderData border_data {
.color = outline_color,
.line_style = line_style,
.width = outline_width,
};
return BordersData { border_data, border_data, border_data, border_data };
}
}
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