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LibWeb: Basic rendering of border-radius

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It supports all four corners.
This commit is contained in:
Tobias Christiansen 2021-05-15 00:45:33 +02:00 • committed by Andreas Kling
parent 8b63c2a10e
commit 9e04c0598b
1 changed files with 112 additions and 4 deletions
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116
Userland/Libraries/LibWeb/Layout/Box.cpp
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@ -58,10 +58,118 @@ void Box::paint(PaintContext& context, PaintPhase phase)
void Box::paint_border(PaintContext& context)
{
auto bordered_rect = this->bordered_rect();
Painting::paint_border(context, Painting::BorderEdge::Left, bordered_rect, computed_values());
Painting::paint_border(context, Painting::BorderEdge::Right, bordered_rect, computed_values());
Painting::paint_border(context, Painting::BorderEdge::Top, bordered_rect, computed_values());
Painting::paint_border(context, Painting::BorderEdge::Bottom, bordered_rect, computed_values());
auto border_rect = enclosing_int_rect(bordered_rect);
// FIXME: Support elliptical border radii.
// FIXME: some values should be relative to the height() if specified, but which? For now, all relative values are relative to the width.
auto bottom_left_radius = computed_values().border_bottom_left_radius().resolved_or_zero(*this, width()).to_px(*this);
auto bottom_right_radius = computed_values().border_bottom_right_radius().resolved_or_zero(*this, width()).to_px(*this);
auto top_left_radius = computed_values().border_top_left_radius().resolved_or_zero(*this, width()).to_px(*this);
auto top_right_radius = computed_values().border_top_right_radius().resolved_or_zero(*this, width()).to_px(*this);
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, computed_values());
Painting::paint_border(context, Painting::BorderEdge::Right, right_border_rect, computed_values());
Painting::paint_border(context, Painting::BorderEdge::Bottom, bottom_border_rect, computed_values());
Painting::paint_border(context, Painting::BorderEdge::Left, left_border_rect, computed_values());
// Draws a quarter cirle clockwise
auto draw_quarter_circle = [&](Gfx::IntPoint& from, Gfx::IntPoint& to, Gfx::Color color, int thickness) {
Gfx::IntPoint center = { 0, 0 };
Gfx::IntPoint offset = { 0, 0 };
Gfx::IntPoint circle_position = { 0, 0 };
auto radius = abs(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 {
// How did you get here?
VERIFY_NOT_REACHED();
}
Gfx::IntRect circle_rect = {
border_rect.x() + circle_position.x(),
border_rect.y() + circle_position.y(),
radius,
radius
};
context.painter().draw_circle_arc_intersecting(
circle_rect,
center + offset,
radius,
color,
thickness);
};
// FIXME: Which color to use?
if (top_left_radius) {
Gfx::IntPoint arc_start = { 0, (int)top_left_radius };
Gfx::IntPoint arc_end = { (int)top_left_radius, 0 };
draw_quarter_circle(arc_start, arc_end, computed_values().border_top().color, computed_values().border_top().width);
}
if (top_right_radius) {
Gfx::IntPoint arc_start = { (int)top_left_radius + (int)top_border_rect.width(), 0 };
Gfx::IntPoint arc_end = { (int)bordered_rect.width(), (int)top_right_radius };
draw_quarter_circle(arc_start, arc_end, computed_values().border_top().color, computed_values().border_top().width);
}
if (bottom_right_radius) {
Gfx::IntPoint arc_start = { (int)bordered_rect.width(), (int)top_right_radius + (int)right_border_rect.height() };
Gfx::IntPoint arc_end = { (int)bottom_border_rect.width() + (int)bottom_left_radius, (int)bordered_rect.height() };
draw_quarter_circle(arc_start, arc_end, computed_values().border_bottom().color, computed_values().border_bottom().width);
}
if (bottom_left_radius) {
Gfx::IntPoint arc_start = { (int)bottom_left_radius, (int)bordered_rect.height() };
Gfx::IntPoint arc_end = { 0, (int)bordered_rect.height() - (int)bottom_left_radius };
draw_quarter_circle(arc_start, arc_end, computed_values().border_bottom().color, computed_values().border_bottom().width);
}
}
void Box::paint_background(PaintContext& context)