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LibWeb: Add Painting::Box and move things from Layout::Box into it

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The "paintable" state in Layout::Box was actually not safe to access
until after layout had been performed.

As a first step towards making this harder to mess up accidentally,
this patch moves painting information from Layout::Box to a new class:
Painting::Box. Every layout can have a corresponding paint box, and
it holds the final used metrics determined by layout.

The paint box is created and populated by FormattingState::commit().

I've also added DOM::Node::paint_box() as a convenient way to access
the paint box (if available) of a given DOM node.

Going forward, I believe this will allow us to better separate data
that belongs to layout vs painting, and also open up opportunities
for naturally invalidating caches in the paint box (since it's
reconstituted by every layout.)
This commit is contained in:
Andreas Kling 2022-03-09 23:53:41 +01:00
parent db404af6df
commit a4d51b3dc2
35 changed files with 365 additions and 293 deletions
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86
Userland/Libraries/LibWeb/Layout/Box.cpp
View file

@ -15,10 +15,25 @@
#include <LibWeb/Layout/FormattingContext.h>
#include <LibWeb/Painting/BackgroundPainting.h>
#include <LibWeb/Painting/BorderPainting.h>
#include <LibWeb/Painting/Box.h>
#include <LibWeb/Painting/ShadowPainting.h>
namespace Web::Layout {
Box::Box(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
: NodeWithStyleAndBoxModelMetrics(document, node, move(style))
{
}
Box::Box(DOM::Document& document, DOM::Node* node, CSS::ComputedValues computed_values)
: NodeWithStyleAndBoxModelMetrics(document, node, move(computed_values))
{
}
Box::~Box()
{
}
void Box::paint(PaintContext& context, PaintPhase phase)
{
if (!is_visible())
@ -34,17 +49,17 @@ void Box::paint(PaintContext& context, PaintPhase phase)
}
if (phase == PaintPhase::Overlay && dom_node() && document().inspected_node() == dom_node()) {
auto content_rect = absolute_rect();
auto content_rect = m_paint_box->absolute_rect();
auto margin_box = box_model().margin_box();
Gfx::FloatRect margin_rect;
margin_rect.set_x(absolute_x() - margin_box.left);
margin_rect.set_width(content_width() + margin_box.left + margin_box.right);
margin_rect.set_y(absolute_y() - margin_box.top);
margin_rect.set_height(content_height() + margin_box.top + margin_box.bottom);
margin_rect.set_x(m_paint_box->absolute_x() - margin_box.left);
margin_rect.set_width(m_paint_box->content_width() + margin_box.left + margin_box.right);
margin_rect.set_y(m_paint_box->absolute_y() - margin_box.top);
margin_rect.set_height(m_paint_box->content_height() + margin_box.top + margin_box.bottom);
auto border_rect = absolute_border_box_rect();
auto padding_rect = absolute_padding_box_rect();
auto border_rect = m_paint_box->absolute_border_box_rect();
auto padding_rect = m_paint_box->absolute_padding_box_rect();
auto paint_inspector_rect = [&](Gfx::FloatRect const& rect, Color color) {
context.painter().fill_rect(enclosing_int_rect(rect), Color(color).with_alpha(100));
@ -74,7 +89,7 @@ void Box::paint(PaintContext& context, PaintPhase phase)
}
if (phase == PaintPhase::FocusOutline && dom_node() && dom_node()->is_element() && verify_cast<DOM::Element>(*dom_node()).is_focused()) {
context.painter().draw_rect(enclosing_int_rect(absolute_rect()), context.palette().focus_outline());
context.painter().draw_rect(enclosing_int_rect(m_paint_box->absolute_rect()), context.palette().focus_outline());
}
}
@ -86,7 +101,7 @@ void Box::paint_border(PaintContext& context)
.bottom = computed_values().border_bottom(),
.left = computed_values().border_left(),
};
Painting::paint_all_borders(context, absolute_border_box_rect(), normalized_border_radius_data(), borders_data);
Painting::paint_all_borders(context, m_paint_box->absolute_border_box_rect(), normalized_border_radius_data(), borders_data);
}
void Box::paint_background(PaintContext& context)
@ -110,13 +125,13 @@ void Box::paint_background(PaintContext& context)
background_color = document().background_color(context.palette());
}
} else {
background_rect = enclosing_int_rect(absolute_padding_box_rect());
background_rect = enclosing_int_rect(m_paint_box->absolute_padding_box_rect());
}
// HACK: If the Box has a border, use the bordered_rect to paint the background.
// This way if we have a border-radius there will be no gap between the filling and actual border.
if (computed_values().border_top().width || computed_values().border_right().width || computed_values().border_bottom().width || computed_values().border_left().width)
background_rect = enclosing_int_rect(absolute_border_box_rect());
background_rect = enclosing_int_rect(m_paint_box->absolute_border_box_rect());
Painting::paint_background(context, *this, background_rect, background_color, background_layers, normalized_border_radius_data());
}
@ -138,12 +153,12 @@ void Box::paint_box_shadow(PaintContext& context)
static_cast<int>(layer.spread_distance.to_px(*this)),
layer.placement == CSS::BoxShadowPlacement::Outer ? Painting::BoxShadowPlacement::Outer : Painting::BoxShadowPlacement::Inner);
}
Painting::paint_box_shadow(context, enclosing_int_rect(absolute_border_box_rect()), resolved_box_shadow_data);
Painting::paint_box_shadow(context, enclosing_int_rect(m_paint_box->absolute_border_box_rect()), resolved_box_shadow_data);
}
Painting::BorderRadiusData Box::normalized_border_radius_data()
{
return Painting::normalized_border_radius_data(*this, absolute_border_box_rect(),
return Painting::normalized_border_radius_data(*this, m_paint_box->absolute_border_box_rect(),
computed_values().border_top_left_radius(),
computed_values().border_top_right_radius(),
computed_values().border_bottom_right_radius(),
@ -178,7 +193,7 @@ HitTestResult Box::hit_test(const Gfx::IntPoint& position, HitTestType type) con
// FIXME: It would be nice if we could confidently skip over hit testing
// parts of the layout tree, but currently we can't just check
// m_rect.contains() since inline text rects can't be trusted..
HitTestResult result { absolute_border_box_rect().contains(position.x(), position.y()) ? this : nullptr };
HitTestResult result { m_paint_box->absolute_border_box_rect().contains(position.x(), position.y()) ? this : nullptr };
for_each_child_in_paint_order([&](auto& child) {
auto child_result = child.hit_test(position, type);
if (child_result.layout_node)
@ -190,7 +205,7 @@ HitTestResult Box::hit_test(const Gfx::IntPoint& position, HitTestType type) con
void Box::set_needs_display()
{
if (!is_inline()) {
browsing_context().set_needs_display(enclosing_int_rect(absolute_rect()));
browsing_context().set_needs_display(enclosing_int_rect(m_paint_box->absolute_rect()));
return;
}
@ -202,45 +217,6 @@ bool Box::is_body() const
return dom_node() && dom_node() == document().body();
}
void Box::set_offset(const Gfx::FloatPoint& offset)
{
if (m_offset == offset)
return;
m_offset = offset;
did_set_rect();
}
void Box::set_content_size(Gfx::FloatSize const& size)
{
if (m_content_size == size)
return;
m_content_size = size;
did_set_rect();
}
Gfx::FloatPoint Box::effective_offset() const
{
if (m_containing_line_box_fragment.has_value()) {
auto const& fragment = containing_block()->line_boxes()[m_containing_line_box_fragment->line_box_index].fragments()[m_containing_line_box_fragment->fragment_index];
return fragment.offset();
}
return m_offset;
}
const Gfx::FloatRect Box::absolute_rect() const
{
Gfx::FloatRect rect { effective_offset(), content_size() };
for (auto* block = containing_block(); block; block = block->containing_block()) {
rect.translate_by(block->effective_offset());
}
return rect;
}
void Box::set_containing_line_box_fragment(Optional<LineBoxFragmentCoordinate> fragment_coordinate)
{
m_containing_line_box_fragment = fragment_coordinate;
}
StackingContext* Box::enclosing_stacking_context()
{
for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
@ -262,7 +238,7 @@ void Box::before_children_paint(PaintContext& context, PaintPhase phase)
// FIXME: Support more overflow variations.
if (computed_values().overflow_x() == CSS::Overflow::Hidden && computed_values().overflow_y() == CSS::Overflow::Hidden) {
context.painter().save();
context.painter().add_clip_rect(enclosing_int_rect(absolute_border_box_rect()));
context.painter().add_clip_rect(enclosing_int_rect(m_paint_box->absolute_border_box_rect()));
}
}