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serenity/Userland/Libraries/LibWeb/Painting/BorderPainting.cpp
zhiyuang 97130a4e66 LibWeb: More correctly paint joins between borders 
The refactor of the border painting mainly to handle:
1. Single border with minor border radius.
2. Different border widths and border colors joined situations.
This refactor only apply to solid border.

The main differece is to use Path.fill to paint each border,
not fill_rect anymore. There's a special case need to consider.
The Path.fill will leave shared edge blank between two borders.
To handle this, we decide to combine the borders with same color
to paint together.
2023-07-18 14:51:13 +01:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, 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 <LibGfx/Painter.h>
#include <LibGfx/Path.h>
#include <LibWeb/Painting/BorderPainting.h>
#include <LibWeb/Painting/PaintContext.h>
namespace Web::Painting {
BorderRadiiData normalized_border_radii_data(Layout::Node const& node, CSSPixelRect const& rect, CSS::BorderRadiusData top_left_radius, CSS::BorderRadiusData top_right_radius, CSS::BorderRadiusData bottom_right_radius, CSS::BorderRadiusData bottom_left_radius)
{
BorderRadiusData bottom_left_radius_px {};
BorderRadiusData bottom_right_radius_px {};
BorderRadiusData top_left_radius_px {};
BorderRadiusData top_right_radius_px {};
bottom_left_radius_px.horizontal_radius = bottom_left_radius.horizontal_radius.to_px(node, rect.width());
bottom_right_radius_px.horizontal_radius = bottom_right_radius.horizontal_radius.to_px(node, rect.width());
top_left_radius_px.horizontal_radius = top_left_radius.horizontal_radius.to_px(node, rect.width());
top_right_radius_px.horizontal_radius = top_right_radius.horizontal_radius.to_px(node, rect.width());
bottom_left_radius_px.vertical_radius = bottom_left_radius.vertical_radius.to_px(node, rect.height());
bottom_right_radius_px.vertical_radius = bottom_right_radius.vertical_radius.to_px(node, rect.height());
top_left_radius_px.vertical_radius = top_left_radius.vertical_radius.to_px(node, rect.height());
top_right_radius_px.vertical_radius = top_right_radius.vertical_radius.to_px(node, rect.height());
// Scale overlapping curves according to https://www.w3.org/TR/css-backgrounds-3/#corner-overlap
CSSPixels f = 1.0f;
auto width_reciprocal = 1.0 / rect.width().to_double();
auto height_reciprocal = 1.0 / rect.height().to_double();
f = max(f, width_reciprocal * (top_left_radius_px.horizontal_radius + top_right_radius_px.horizontal_radius));
f = max(f, height_reciprocal * (top_right_radius_px.vertical_radius + bottom_right_radius_px.vertical_radius));
f = max(f, width_reciprocal * (bottom_left_radius_px.horizontal_radius + bottom_right_radius_px.horizontal_radius));
f = max(f, height_reciprocal * (top_left_radius_px.vertical_radius + bottom_left_radius_px.vertical_radius));
f = 1.0 / f.to_double();
top_left_radius_px.horizontal_radius *= f;
top_left_radius_px.vertical_radius *= f;
top_right_radius_px.horizontal_radius *= f;
top_right_radius_px.vertical_radius *= f;
bottom_right_radius_px.horizontal_radius *= f;
bottom_right_radius_px.vertical_radius *= f;
bottom_left_radius_px.horizontal_radius *= f;
bottom_left_radius_px.vertical_radius *= f;
return BorderRadiiData { top_left_radius_px, top_right_radius_px, bottom_right_radius_px, bottom_left_radius_px };
}
Gfx::Color border_color(BorderEdge edge, BordersData 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 = Color::from_rgb(0x5a5a5a);
auto bottom_right_color = Color::from_rgb(0x888888);
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 = Color::from_rgb(0x888888);
auto bottom_right_color = Color::from_rgb(0x5a5a5a);
return (edge == BorderEdge::Left || edge == BorderEdge::Top) ? top_left_color : bottom_right_color;
}
return border_data.color;
}
void paint_border(PaintContext& context, BorderEdge edge, DevicePixelRect const& rect, Gfx::AntiAliasingPainter::CornerRadius const& radius, Gfx::AntiAliasingPainter::CornerRadius const& opposite_radius, BordersData 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;
}
}();
CSSPixels width = border_data.width;
if (width <= 0)
return;
auto color = border_color(edge, borders_data);
auto border_style = border_data.line_style;
auto device_pixel_width = context.enclosing_device_pixels(width);
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;
if (border_style == CSS::LineStyle::Dotted)
gfx_line_style = Gfx::Painter::LineStyle::Dotted;
if (border_style == CSS::LineStyle::Dashed)
gfx_line_style = Gfx::Painter::LineStyle::Dashed;
if (gfx_line_style != Gfx::Painter::LineStyle::Solid) {
auto [p1, p2] = points_for_edge(edge, rect);
switch (edge) {
case BorderEdge::Top:
p1.translate_by(device_pixel_width / 2, device_pixel_width / 2);
p2.translate_by(-device_pixel_width / 2, device_pixel_width / 2);
break;
case BorderEdge::Right:
p1.translate_by(-device_pixel_width / 2, device_pixel_width / 2);
p2.translate_by(-device_pixel_width / 2, -device_pixel_width / 2);
break;
case BorderEdge::Bottom:
p1.translate_by(device_pixel_width / 2, -device_pixel_width / 2);
p2.translate_by(-device_pixel_width / 2, -device_pixel_width / 2);
break;
case BorderEdge::Left:
p1.translate_by(device_pixel_width / 2, device_pixel_width / 2);
p2.translate_by(device_pixel_width / 2, -device_pixel_width / 2);
break;
}
if (border_style == CSS::LineStyle::Dotted) {
Gfx::AntiAliasingPainter aa_painter { context.painter() };
aa_painter.draw_line(p1.to_type<int>(), p2.to_type<int>(), color, device_pixel_width.value(), gfx_line_style);
return;
}
context.painter().draw_line(p1.to_type<int>(), p2.to_type<int>(), color, device_pixel_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) {
Gfx::AntiAliasingPainter aa_painter { context.painter() };
path.close_all_subpaths();
aa_painter.fill_path(path, color, Gfx::Painter::WindingRule::EvenOdd);
path.clear();
}
};
auto compute_midpoint = [](int horizontal_radius, int vertical_radius) {
if (horizontal_radius == 0 && vertical_radius == 0) {
return Gfx::FloatPoint(0, 0);
}
// 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 = context.enclosing_device_pixels(borders_data.left.width);
auto opposite_joined_border_width = context.enclosing_device_pixels(borders_data.right.width);
bool joined_corner_has_inner_corner = device_pixel_width < radius.vertical_radius && joined_border_width < radius.horizontal_radius;
bool opposite_joined_corner_has_inner_corner = device_pixel_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;
if (borders_data.left.width == 0) {
joined_corner_endpoint_offset = Gfx::FloatPoint(-radius.horizontal_radius, radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius);
joined_corner_endpoint_offset = Gfx::FloatPoint(-midpoint.x(), radius.vertical_radius - midpoint.y());
}
if (borders_data.right.width == 0) {
opposite_joined_border_corner_offset = Gfx::FloatPoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius);
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 - device_pixel_width.value());
Gfx::FloatPoint inner_corner_endpoint_offset = Gfx::FloatPoint(
-midpoint.x(),
radius.vertical_radius - device_pixel_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 - device_pixel_width.value());
Gfx::FloatPoint inner_corner_endpoint_offset = Gfx::FloatPoint(
midpoint.x(),
opposite_radius.vertical_radius - device_pixel_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(), device_pixel_width.value()),
Gfx::FloatSize(opposite_joined_border_width.value(), device_pixel_width.value()),
last || color != border_color(BorderEdge::Right, borders_data));
break;
}
case BorderEdge::Right: {
auto joined_border_width = context.enclosing_device_pixels(borders_data.top.width);
auto opposite_joined_border_width = context.enclosing_device_pixels(borders_data.bottom.width);
bool joined_corner_has_inner_corner = device_pixel_width < radius.horizontal_radius && joined_border_width < radius.vertical_radius;
bool opposite_joined_corner_has_inner_corner = device_pixel_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;
if (borders_data.top.width == 0) {
joined_corner_endpoint_offset = Gfx::FloatPoint(-radius.horizontal_radius, -radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius);
joined_corner_endpoint_offset = Gfx::FloatPoint(midpoint.x() - radius.horizontal_radius, -midpoint.y());
}
if (borders_data.bottom.width == 0) {
opposite_joined_border_corner_offset = Gfx::FloatPoint(-opposite_radius.horizontal_radius, opposite_radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius);
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 - device_pixel_width.value(),
radius.vertical_radius - joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
-(radius.horizontal_radius - midpoint.x() - device_pixel_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 - device_pixel_width.value(),
opposite_radius.vertical_radius - opposite_joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
-(opposite_radius.horizontal_radius - midpoint.x() - device_pixel_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(device_pixel_width.value(), joined_border_width.value()),
Gfx::FloatSize(device_pixel_width.value(), opposite_joined_border_width.value()),
last || color != border_color(BorderEdge::Bottom, borders_data));
break;
}
case BorderEdge::Bottom: {
auto joined_border_width = context.enclosing_device_pixels(borders_data.right.width);
auto opposite_joined_border_width = context.enclosing_device_pixels(borders_data.left.width);
bool joined_corner_has_inner_corner = device_pixel_width < radius.vertical_radius && joined_border_width < radius.horizontal_radius;
bool opposite_joined_corner_has_inner_corner = device_pixel_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;
if (borders_data.right.width == 0) {
joined_corner_endpoint_offset = Gfx::FloatPoint(radius.horizontal_radius, -radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius);
joined_corner_endpoint_offset = Gfx::FloatPoint(midpoint.x(), midpoint.y() - radius.vertical_radius);
}
if (borders_data.left.width == 0) {
opposite_joined_border_corner_offset = Gfx::FloatPoint(-opposite_radius.horizontal_radius, -opposite_radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius);
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 - device_pixel_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(midpoint.x(), -(radius.vertical_radius - midpoint.y() - device_pixel_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 - device_pixel_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
-midpoint.x(),
-(opposite_radius.vertical_radius - midpoint.y() - device_pixel_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(), device_pixel_width.value()),
Gfx::FloatSize(opposite_joined_border_width.value(), device_pixel_width.value()),
last || color != border_color(BorderEdge::Left, borders_data));
break;
}
case BorderEdge::Left: {
auto joined_border_width = context.enclosing_device_pixels(borders_data.bottom.width);
auto opposite_joined_border_width = context.enclosing_device_pixels(borders_data.top.width);
bool joined_corner_has_inner_corner = device_pixel_width < radius.horizontal_radius && joined_border_width < radius.vertical_radius;
bool opposite_joined_corner_has_inner_corner = device_pixel_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;
if (borders_data.bottom.width == 0) {
joined_corner_endpoint_offset = Gfx::FloatPoint(radius.horizontal_radius, radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(radius.horizontal_radius, radius.vertical_radius);
joined_corner_endpoint_offset = Gfx::FloatPoint(radius.horizontal_radius - midpoint.x(), midpoint.y());
}
if (borders_data.top.width == 0) {
opposite_joined_border_corner_offset = Gfx::FloatPoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius);
} else {
auto midpoint = compute_midpoint(opposite_radius.horizontal_radius, opposite_radius.vertical_radius);
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 - device_pixel_width.value(),
radius.vertical_radius - joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(radius.horizontal_radius - device_pixel_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 - device_pixel_width.value(),
opposite_radius.vertical_radius - opposite_joined_border_width.value());
Gfx::FloatPoint inner_corner = Gfx::FloatPoint(
opposite_radius.horizontal_radius - device_pixel_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(device_pixel_width.value(), joined_border_width.value()),
Gfx::FloatSize(device_pixel_width.value(), opposite_joined_border_width.value()),
last || color != border_color(BorderEdge::Top, borders_data));
break;
}
}
}
RefPtr<Gfx::Bitmap> get_cached_corner_bitmap(DevicePixelSize corners_size)
{
auto allocate_mask_bitmap = [&]() -> RefPtr<Gfx::Bitmap> {
auto bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, corners_size.to_type<int>());
if (!bitmap.is_error())
return bitmap.release_value();
return nullptr;
};
// FIXME: Allocate per page?
static thread_local auto corner_bitmap = allocate_mask_bitmap();
// Only reallocate the corner bitmap is the existing one is too small.
// (should mean no more allocations after the first paint -- amortised zero allocations :^))
if (corner_bitmap && corner_bitmap->rect().size().contains(corners_size.to_type<int>())) {
Gfx::Painter painter { *corner_bitmap };
painter.clear_rect({ { 0, 0 }, corners_size }, Gfx::Color());
} else {
corner_bitmap = allocate_mask_bitmap();
if (!corner_bitmap) {
dbgln("Failed to allocate corner bitmap with size {}", corners_size);
return nullptr;
}
}
return corner_bitmap;
}
void paint_all_borders(PaintContext& context, CSSPixelRect const& bordered_rect, BorderRadiiData const& border_radii_data, BordersData 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 border_rect = context.rounded_device_rect(bordered_rect);
auto top_left = border_radii_data.top_left.as_corner(context);
auto top_right = border_radii_data.top_right.as_corner(context);
auto bottom_right = border_radii_data.bottom_right.as_corner(context);
auto bottom_left = border_radii_data.bottom_left.as_corner(context);
// 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,
context.enclosing_device_pixels(borders_data.top.width)
};
DevicePixelRect right_border_rect = {
border_rect.x() + (border_rect.width() - context.enclosing_device_pixels(borders_data.right.width)),
border_rect.y() + top_right.vertical_radius,
context.enclosing_device_pixels(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() - context.enclosing_device_pixels(borders_data.bottom.width)),
border_rect.width() - bottom_left.horizontal_radius - bottom_right.horizontal_radius,
context.enclosing_device_pixels(borders_data.bottom.width)
};
DevicePixelRect left_border_rect = {
border_rect.x(),
border_rect.y() + top_left.vertical_radius,
context.enclosing_device_pixels(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(context, BorderEdge::Top, top_border_rect, top_left, top_right, borders_data, path, edge == borders.last());
break;
case BorderEdge::Right:
paint_border(context, BorderEdge::Right, right_border_rect, top_right, bottom_right, borders_data, path, edge == borders.last());
break;
case BorderEdge::Bottom:
paint_border(context, BorderEdge::Bottom, bottom_border_rect, bottom_right, bottom_left, borders_data, path, edge == borders.last());
break;
case BorderEdge::Left:
paint_border(context, BorderEdge::Left, left_border_rect, bottom_left, top_left, borders_data, path, edge == borders.last());
break;
default:
VERIFY_NOT_REACHED();
}
}
}
}
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