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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Painter.h>
#include <LibWeb/Painting/BorderPainting.h>
#include <LibWeb/Painting/PaintContext.h>
namespace Web::Painting {
BorderRadiusData normalized_border_radius_data(Layout::Node const& node, Gfx::FloatRect const& rect, CSS::LengthPercentage top_left_radius, CSS::LengthPercentage top_right_radius, CSS::LengthPercentage bottom_right_radius, CSS::LengthPercentage bottom_left_radius)
{
// FIXME: Some values should be relative to the height() if specified, but which?
// Spec just says "Refer to corresponding dimension of the border box."
// For now, all relative values are relative to the width.
auto width_length = CSS::Length::make_px(rect.width());
auto bottom_left_radius_px = bottom_left_radius.resolved(node, width_length).to_px(node);
auto bottom_right_radius_px = bottom_right_radius.resolved(node, width_length).to_px(node);
auto top_left_radius_px = top_left_radius.resolved(node, width_length).to_px(node);
auto top_right_radius_px = top_right_radius.resolved(node, width_length).to_px(node);
// Scale overlapping curves according to https://www.w3.org/TR/css-backgrounds-3/#corner-overlap
auto f = 1.0f;
f = min(f, rect.width() / (float)(top_left_radius_px + top_right_radius_px));
f = min(f, rect.height() / (float)(top_right_radius_px + bottom_right_radius_px));
f = min(f, rect.width() / (float)(bottom_left_radius_px + bottom_right_radius_px));
f = min(f, rect.height() / (float)(top_left_radius_px + bottom_left_radius_px));
top_left_radius_px = (int)(top_left_radius_px * f);
top_right_radius_px = (int)(top_right_radius_px * f);
bottom_right_radius_px = (int)(bottom_right_radius_px * f);
bottom_left_radius_px = (int)(bottom_left_radius_px * f);
return BorderRadiusData { top_left_radius_px, top_right_radius_px, bottom_right_radius_px, bottom_left_radius_px };
}
void paint_border(PaintContext& context, BorderEdge edge, Gfx::FloatRect const& a_rect, BorderRadiusData const& border_radius_data, BordersData const& borders_data)
{
// FIXME: This is a hack that snaps the incoming rect to integer pixel values before painting each side.
// This needs a more general solution.
auto rect = enclosing_int_rect(a_rect).to_type<float>();
const auto& 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;
}
}();
float width = border_data.width;
if (width <= 0)
return;
auto color = border_data.color;
auto border_style = border_data.line_style;
int int_width = max((int)width, 1);
struct Points {
Gfx::FloatPoint p1;
Gfx::FloatPoint p2;
};
auto points_for_edge = [](BorderEdge edge, const Gfx::FloatRect& rect) -> Points {
switch (edge) {
case BorderEdge::Top:
return { rect.top_left(), rect.top_right() };
case BorderEdge::Right:
return { rect.top_right(), rect.bottom_right() };
case BorderEdge::Bottom:
return { rect.bottom_left(), rect.bottom_right() };
default: // Edge::Left
return { rect.top_left(), rect.bottom_left() };
}
};
auto [p1, p2] = points_for_edge(edge, rect);
if (border_style == CSS::LineStyle::Inset) {
auto top_left_color = Color::from_rgb(0x5a5a5a);
auto bottom_right_color = Color::from_rgb(0x888888);
color = (edge == BorderEdge::Left || edge == BorderEdge::Top) ? top_left_color : bottom_right_color;
} else if (border_style == CSS::LineStyle::Outset) {
auto top_left_color = Color::from_rgb(0x888888);
auto bottom_right_color = Color::from_rgb(0x5a5a5a);
color = (edge == BorderEdge::Left || edge == BorderEdge::Top) ? top_left_color : bottom_right_color;
}
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) {
switch (edge) {
case BorderEdge::Top:
p1.translate_by(int_width / 2, int_width / 2);
p2.translate_by(-int_width / 2, int_width / 2);
break;
case BorderEdge::Right:
p1.translate_by(-int_width / 2, int_width / 2);
p2.translate_by(-int_width / 2, -int_width / 2);
break;
case BorderEdge::Bottom:
p1.translate_by(int_width / 2, -int_width / 2);
p2.translate_by(-int_width / 2, -int_width / 2);
break;
case BorderEdge::Left:
p1.translate_by(int_width / 2, int_width / 2);
p2.translate_by(int_width / 2, -int_width / 2);
break;
}
context.painter().draw_line({ (int)p1.x(), (int)p1.y() }, { (int)p2.x(), (int)p2.y() }, color, int_width, gfx_line_style);
return;
}
auto draw_line = [&](auto& p1, auto& p2) {
context.painter().draw_line({ (int)p1.x(), (int)p1.y() }, { (int)p2.x(), (int)p2.y() }, color, 1, gfx_line_style);
};
float p1_step = 0;
float p2_step = 0;
bool has_top_left_radius = border_radius_data.top_left > 0;
bool has_top_right_radius = border_radius_data.top_right > 0;
bool has_bottom_left_radius = border_radius_data.bottom_left > 0;
bool has_bottom_right_radius = border_radius_data.bottom_right > 0;
switch (edge) {
case BorderEdge::Top:
p1_step = has_top_left_radius ? 0 : borders_data.left.width / (float)int_width;
p2_step = has_top_right_radius ? 0 : borders_data.right.width / (float)int_width;
for (int i = 0; i < int_width; ++i) {
draw_line(p1, p2);
p1.translate_by(p1_step, 1);
p2.translate_by(-p2_step, 1);
}
break;
case BorderEdge::Right:
p1_step = has_top_right_radius ? 0 : borders_data.top.width / (float)int_width;
p2_step = has_bottom_right_radius ? 0 : borders_data.bottom.width / (float)int_width;
for (int i = int_width - 1; i >= 0; --i) {
draw_line(p1, p2);
p1.translate_by(-1, p1_step);
p2.translate_by(-1, -p2_step);
}
break;
case BorderEdge::Bottom:
p1_step = has_bottom_left_radius ? 0 : borders_data.left.width / (float)int_width;
p2_step = has_bottom_right_radius ? 0 : borders_data.right.width / (float)int_width;
for (int i = int_width - 1; i >= 0; --i) {
draw_line(p1, p2);
p1.translate_by(p1_step, -1);
p2.translate_by(-p2_step, -1);
}
break;
case BorderEdge::Left:
p1_step = has_top_left_radius ? 0 : borders_data.top.width / (float)int_width;
p2_step = has_bottom_left_radius ? 0 : borders_data.bottom.width / (float)int_width;
for (int i = 0; i < int_width; ++i) {
draw_line(p1, p2);
p1.translate_by(1, p1_step);
p2.translate_by(1, -p2_step);
}
break;
}
}
void paint_all_borders(PaintContext& context, Gfx::FloatRect const& bordered_rect, BorderRadiusData const& border_radius_data, BordersData const& borders_data)
{
auto const border_rect = bordered_rect;
auto const top_left_radius = border_radius_data.top_left;
auto const top_right_radius = border_radius_data.top_right;
auto const bottom_right_radius = border_radius_data.bottom_right;
auto const bottom_left_radius = border_radius_data.bottom_left;
// FIXME: Support elliptical border radii.
Gfx::FloatRect top_border_rect = {
border_rect.x() + top_left_radius,
border_rect.y(),
border_rect.width() - top_left_radius - top_right_radius,
border_rect.height()
};
Gfx::FloatRect right_border_rect = {
border_rect.x(),
border_rect.y() + top_right_radius,
border_rect.width(),
border_rect.height() - top_right_radius - bottom_right_radius
};
Gfx::FloatRect bottom_border_rect = {
border_rect.x() + bottom_left_radius,
border_rect.y(),
border_rect.width() - bottom_left_radius - bottom_right_radius,
border_rect.height()
};
Gfx::FloatRect left_border_rect = {
border_rect.x(),
border_rect.y() + top_left_radius,
border_rect.width(),
border_rect.height() - top_left_radius - bottom_left_radius
};
Painting::paint_border(context, Painting::BorderEdge::Top, top_border_rect, border_radius_data, borders_data);
Painting::paint_border(context, Painting::BorderEdge::Right, right_border_rect, border_radius_data, borders_data);
Painting::paint_border(context, Painting::BorderEdge::Bottom, bottom_border_rect, border_radius_data, borders_data);
Painting::paint_border(context, Painting::BorderEdge::Left, left_border_rect, border_radius_data, borders_data);
// Draws a quarter circle clockwise
auto draw_quarter_circle = [&](Gfx::FloatPoint const& from, Gfx::FloatPoint const& to, Gfx::Color color, int thickness) {
Gfx::FloatPoint center = { 0, 0 };
Gfx::FloatPoint offset = { 0, 0 };
Gfx::FloatPoint circle_position = { 0, 0 };
auto radius = fabsf(from.x() - to.x());
if (from.x() < to.x() && from.y() > to.y()) {
// top-left
center.set_x(radius);
center.set_y(radius);
offset.set_y(1);
} else if (from.x() < to.x() && from.y() < to.y()) {
// top-right
circle_position.set_x(from.x());
center.set_y(radius);
offset.set_x(-1);
offset.set_y(1);
} else if (from.x() > to.x() && from.y() < to.y()) {
// bottom-right
circle_position.set_x(to.x());
circle_position.set_y(from.y());
offset.set_x(-1);
} else if (from.x() > to.x() && from.y() > to.y()) {
// bottom-left
circle_position.set_y(to.y());
center.set_x(radius);
} else {
// You are lying about your intentions of drawing a quarter circle, your coordinates are (partly) the same!
return;
}
Gfx::FloatRect circle_rect = {
border_rect.x() + circle_position.x(),
border_rect.y() + circle_position.y(),
radius,
radius
};
context.painter().draw_circle_arc_intersecting(
Gfx::enclosing_int_rect(circle_rect),
(center + offset).to_rounded<int>(),
radius,
color,
thickness);
};
// FIXME: Which color to use?
if (top_left_radius != 0) {
Gfx::FloatPoint arc_start = { 0, top_left_radius };
Gfx::FloatPoint arc_end = { top_left_radius, 0 };
draw_quarter_circle(arc_start, arc_end, borders_data.top.color, borders_data.top.width);
}
if (top_right_radius != 0) {
Gfx::FloatPoint arc_start = { top_left_radius + top_border_rect.width(), 0 };
Gfx::FloatPoint arc_end = { bordered_rect.width(), top_right_radius };
draw_quarter_circle(arc_start, arc_end, borders_data.top.color, borders_data.top.width);
}
if (bottom_right_radius != 0) {
Gfx::FloatPoint arc_start = { bordered_rect.width(), top_right_radius + right_border_rect.height() };
Gfx::FloatPoint arc_end = { bottom_border_rect.width() + bottom_left_radius, bordered_rect.height() };
draw_quarter_circle(arc_start, arc_end, borders_data.bottom.color, borders_data.bottom.width);
}
if (bottom_left_radius != 0) {
Gfx::FloatPoint arc_start = { bottom_left_radius, bordered_rect.height() };
Gfx::FloatPoint arc_end = { 0, bordered_rect.height() - bottom_left_radius };
draw_quarter_circle(arc_start, arc_end, borders_data.bottom.color, borders_data.bottom.width);
}
}
}
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