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LibWeb: Use separate structure to represent fragments in paintable tree

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This is a part of refactoring towards making the paintable tree
independent of the layout tree. Now, instead of transferring text
fragments from the layout tree to the paintable tree during the layout
commit phase, we allocate separate PaintableFragments that contain only
the information necessary for painting. Doing this also allows us to
get rid LineBoxes, as they are used only during layout.
This commit is contained in:
Aliaksandr Kalenik 2024-01-12 21:25:05 +01:00 • committed by Andreas Kling
parent 785fa60cca
commit de32b77ceb
401 changed files with 2122 additions and 3614 deletions
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65
Userland/Libraries/LibWeb/Layout/LayoutState.cpp
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@ -8,9 +8,7 @@
#include <LibWeb/Layout/AvailableSpace.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/LayoutState.h>
#include <LibWeb/Layout/TextNode.h>
#include <LibWeb/Layout/Viewport.h>
#include <LibWeb/Painting/BorderRadiiData.h>
#include <LibWeb/Painting/InlinePaintable.h>
#include <LibWeb/Painting/SVGPathPaintable.h>
@ -86,9 +84,8 @@ static CSSPixelRect measure_scrollable_overflow(Box const& box)
// - All line boxes directly contained by the scroll container.
if (is<Painting::PaintableWithLines>(box.paintable())) {
auto const& line_boxes = static_cast<Painting::PaintableWithLines const&>(*box.paintable()).line_boxes();
for (auto const& line_box : line_boxes) {
scrollable_overflow_rect = scrollable_overflow_rect.united(line_box.absolute_rect());
for (auto const& fragment : static_cast<Painting::PaintableWithLines const&>(*box.paintable()).fragments()) {
scrollable_overflow_rect = scrollable_overflow_rect.united(fragment.absolute_rect());
}
}
@ -156,8 +153,8 @@ void LayoutState::resolve_relative_positions(Vector<Painting::PaintableWithLines
// line box fragment in the parent block container that contains it.
auto const& containing_line_box_fragment = used_values.containing_line_box_fragment.value();
auto const& containing_block = *node.containing_block();
auto const& containing_block_paintable = verify_cast<Painting::PaintableWithLines>(*containing_block.paintable_box());
auto const& fragment = containing_block_paintable.line_boxes()[containing_line_box_fragment.line_box_index].fragments()[containing_line_box_fragment.fragment_index];
auto const& containing_block_used_values = get(containing_block);
auto const& fragment = containing_block_used_values.line_boxes[containing_line_box_fragment.line_box_index].fragments()[containing_line_box_fragment.fragment_index];
// The fragment has the final offset for the atomic inline, so we just need to copy it from there.
offset = fragment.offset();
@ -175,26 +172,24 @@ void LayoutState::resolve_relative_positions(Vector<Painting::PaintableWithLines
// Line box fragments:
for (auto const& paintable_with_lines : paintables_with_lines) {
for (auto const& line_box : paintable_with_lines.line_boxes()) {
for (auto& fragment : line_box.fragments()) {
auto const& fragment_node = fragment.layout_node();
if (!is<Layout::NodeWithStyleAndBoxModelMetrics>(*fragment_node.parent()))
continue;
// Collect effective relative position offset from inline-flow parent chain.
CSSPixelPoint offset;
for (auto* ancestor = fragment_node.parent(); ancestor; ancestor = ancestor->parent()) {
if (!is<Layout::NodeWithStyleAndBoxModelMetrics>(*ancestor))
break;
if (!ancestor->display().is_inline_outside() || !ancestor->display().is_flow_inside())
break;
if (ancestor->computed_values().position() == CSS::Positioning::Relative) {
auto const& ancestor_node = static_cast<Layout::NodeWithStyleAndBoxModelMetrics const&>(*ancestor);
auto const& inset = ancestor_node.box_model().inset;
offset.translate_by(inset.left, inset.top);
}
for (auto& fragment : paintable_with_lines.fragments()) {
auto const& fragment_node = fragment.layout_node();
if (!is<Layout::NodeWithStyleAndBoxModelMetrics>(*fragment_node.parent()))
continue;
// Collect effective relative position offset from inline-flow parent chain.
CSSPixelPoint offset;
for (auto* ancestor = fragment_node.parent(); ancestor; ancestor = ancestor->parent()) {
if (!is<Layout::NodeWithStyleAndBoxModelMetrics>(*ancestor))
break;
if (!ancestor->display().is_inline_outside() || !ancestor->display().is_flow_inside())
break;
if (ancestor->computed_values().position() == CSS::Positioning::Relative) {
auto const& ancestor_node = static_cast<Layout::NodeWithStyleAndBoxModelMetrics const&>(*ancestor);
auto const& inset = ancestor_node.box_model().inset;
offset.translate_by(inset.left, inset.top);
}
const_cast<LineBoxFragment&>(fragment).set_offset(fragment.offset().translated(offset));
}
const_cast<Painting::PaintableFragment&>(fragment).set_offset(fragment.offset().translated(offset));
}
}
}
@ -298,10 +293,10 @@ void LayoutState::resolve_border_radii()
}
for (auto& inline_paintable : inline_paintables) {
Vector<Layout::LineBoxFragment&> fragments;
Vector<Painting::PaintableFragment&> fragments;
verify_cast<Painting::PaintableWithLines>(*inline_paintable.containing_block()->paintable_box()).for_each_fragment([&](auto& fragment) {
if (inline_paintable.layout_node().is_inclusive_ancestor_of(fragment.layout_node()))
fragments.append(const_cast<Layout::LineBoxFragment&>(fragment));
fragments.append(const_cast<Painting::PaintableFragment&>(fragment));
return IterationDecision::Continue;
});
@ -410,7 +405,10 @@ void LayoutState::commit(Box& root)
if (is<Painting::PaintableWithLines>(paintable_box)) {
auto& paintable_with_lines = static_cast<Painting::PaintableWithLines&>(paintable_box);
paintable_with_lines.set_line_boxes(move(used_values.line_boxes));
for (auto& line_box : used_values.line_boxes) {
for (auto& fragment : line_box.fragments())
paintable_with_lines.add_fragment(fragment);
}
paintables_with_lines.append(paintable_with_lines);
}
@ -432,14 +430,9 @@ void LayoutState::commit(Box& root)
// - Measure absolute rect of each line box.
// - Collect all text nodes, so we can create paintables for them later.
for (auto& paintable_with_lines : paintables_with_lines) {
for (auto& line_box : paintable_with_lines.line_boxes()) {
CSSPixelRect line_box_absolute_rect;
for (auto const& fragment : line_box.fragments()) {
line_box_absolute_rect = line_box_absolute_rect.united(fragment.absolute_rect());
if (fragment.layout_node().is_text_node())
text_nodes.set(static_cast<Layout::TextNode*>(const_cast<Layout::Node*>(&fragment.layout_node())));
}
const_cast<LineBox&>(line_box).set_absolute_rect(line_box_absolute_rect);
for (auto& fragment : paintable_with_lines.fragments()) {
if (fragment.layout_node().is_text_node())
text_nodes.set(static_cast<Layout::TextNode*>(const_cast<Layout::Node*>(&fragment.layout_node())));
}
}