c93d367d95
Previously, all SVG <text> elements were zero-sized boxes, that were only actually positioned and sized during painting. This led to a number of problems, the most visible of which being that text could not be scaled based on the viewBox. Which this patch, <text> elements get a correctly sized layout box, that can be hit-tested and respects the SVG viewBox. To share code with SVGGeometryElement's the PathData (from the prior commit) has been split into a computed path and computed transforms. The computed path is specific to geometry elements, but the computed transforms are shared between all SVG graphics elements.
538 lines
25 KiB
C++
538 lines
25 KiB
C++
/*
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* Copyright (c) 2022-2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Debug.h>
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#include <LibWeb/Layout/AvailableSpace.h>
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#include <LibWeb/Layout/BlockContainer.h>
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#include <LibWeb/Layout/LayoutState.h>
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#include <LibWeb/Layout/TextNode.h>
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#include <LibWeb/Layout/Viewport.h>
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#include <LibWeb/Painting/SVGGeometryPaintable.h>
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namespace Web::Layout {
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LayoutState::LayoutState(LayoutState const* parent)
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: m_parent(parent)
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, m_root(find_root())
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{
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}
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LayoutState::~LayoutState()
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{
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}
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LayoutState::UsedValues& LayoutState::get_mutable(NodeWithStyle const& node)
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{
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if (auto* used_values = used_values_per_layout_node.get(&node).value_or(nullptr))
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return *used_values;
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for (auto const* ancestor = m_parent; ancestor; ancestor = ancestor->m_parent) {
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if (auto* ancestor_used_values = ancestor->used_values_per_layout_node.get(&node).value_or(nullptr)) {
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auto cow_used_values = adopt_own(*new UsedValues(*ancestor_used_values));
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auto* cow_used_values_ptr = cow_used_values.ptr();
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used_values_per_layout_node.set(&node, move(cow_used_values));
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return *cow_used_values_ptr;
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}
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}
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auto const* containing_block_used_values = node.is_viewport() ? nullptr : &get(*node.containing_block());
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auto new_used_values = adopt_own(*new UsedValues);
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auto* new_used_values_ptr = new_used_values.ptr();
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new_used_values->set_node(const_cast<NodeWithStyle&>(node), containing_block_used_values);
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used_values_per_layout_node.set(&node, move(new_used_values));
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return *new_used_values_ptr;
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}
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LayoutState::UsedValues const& LayoutState::get(NodeWithStyle const& node) const
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{
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if (auto const* used_values = used_values_per_layout_node.get(&node).value_or(nullptr))
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return *used_values;
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for (auto const* ancestor = m_parent; ancestor; ancestor = ancestor->m_parent) {
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if (auto const* ancestor_used_values = ancestor->used_values_per_layout_node.get(&node).value_or(nullptr))
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return *ancestor_used_values;
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}
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auto const* containing_block_used_values = node.is_viewport() ? nullptr : &get(*node.containing_block());
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auto new_used_values = adopt_own(*new UsedValues);
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auto* new_used_values_ptr = new_used_values.ptr();
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new_used_values->set_node(const_cast<NodeWithStyle&>(node), containing_block_used_values);
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const_cast<LayoutState*>(this)->used_values_per_layout_node.set(&node, move(new_used_values));
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return *new_used_values_ptr;
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}
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// https://www.w3.org/TR/css-overflow-3/#scrollable-overflow
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static CSSPixelRect measure_scrollable_overflow(Box const& box)
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{
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if (!box.paintable_box())
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return {};
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auto& paintable_box = const_cast<Painting::PaintableBox&>(*box.paintable_box());
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if (paintable_box.scrollable_overflow_rect().has_value())
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return paintable_box.scrollable_overflow_rect().value();
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// The scrollable overflow area is the union of:
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// - The scroll container’s own padding box.
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auto scrollable_overflow_rect = paintable_box.absolute_padding_box_rect();
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// - All line boxes directly contained by the scroll container.
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if (is<Painting::PaintableWithLines>(box.paintable())) {
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auto const& line_boxes = static_cast<Painting::PaintableWithLines const&>(*box.paintable()).line_boxes();
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for (auto const& line_box : line_boxes) {
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scrollable_overflow_rect = scrollable_overflow_rect.united(line_box.absolute_rect());
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}
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}
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// - The border boxes of all boxes for which it is the containing block
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// and whose border boxes are positioned not wholly in the negative scrollable overflow region,
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// FIXME: accounting for transforms by projecting each box onto the plane of the element that establishes its 3D rendering context. [CSS3-TRANSFORMS]
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if (!box.children_are_inline()) {
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box.for_each_child_of_type<Box>([&box, &scrollable_overflow_rect](Box const& child) {
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if (!child.paintable_box())
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return IterationDecision::Continue;
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auto child_border_box = child.paintable_box()->absolute_border_box_rect();
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// NOTE: Here we check that the child is not wholly in the negative scrollable overflow region.
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if (child_border_box.bottom() > 0 && child_border_box.right() > 0)
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scrollable_overflow_rect = scrollable_overflow_rect.united(child_border_box);
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// - The scrollable overflow areas of all of the above boxes
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// (including zero-area boxes and accounting for transforms as described above),
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// provided they themselves have overflow: visible (i.e. do not themselves trap the overflow)
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// and that scrollable overflow is not already clipped (e.g. by the clip property or the contain property).
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if (is<Viewport>(box) || child.computed_values().overflow_x() == CSS::Overflow::Visible || child.computed_values().overflow_y() == CSS::Overflow::Visible) {
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auto child_scrollable_overflow = measure_scrollable_overflow(child);
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if (is<Viewport>(box) || child.computed_values().overflow_x() == CSS::Overflow::Visible)
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scrollable_overflow_rect.unite_horizontally(child_scrollable_overflow);
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if (is<Viewport>(box) || child.computed_values().overflow_y() == CSS::Overflow::Visible)
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scrollable_overflow_rect.unite_vertically(child_scrollable_overflow);
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}
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return IterationDecision::Continue;
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});
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}
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// FIXME: - The margin areas of grid item and flex item boxes for which the box establishes a containing block.
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// FIXME: - Additional padding added to the end-side of the scrollable overflow rectangle as necessary
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// to enable a scroll position that satisfies the requirements of place-content: end alignment.
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paintable_box.set_overflow_data(Painting::PaintableBox::OverflowData {
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.scrollable_overflow_rect = scrollable_overflow_rect,
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.has_scrollable_overflow = !paintable_box.absolute_padding_box_rect().contains(scrollable_overflow_rect),
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});
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return scrollable_overflow_rect;
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}
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void LayoutState::resolve_relative_positions(Vector<Painting::PaintableWithLines&> const& paintables_with_lines)
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{
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// This function resolves relative position offsets of all the boxes & fragments in the paint tree.
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// It runs *after* the paint tree has been constructed, so it modifies paintable node & fragment offsets directly.
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// Regular boxes (not line box fragments):
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for (auto& it : used_values_per_layout_node) {
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auto& used_values = *it.value;
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auto& node = const_cast<NodeWithStyle&>(used_values.node());
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if (!node.is_box())
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continue;
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auto& paintable = static_cast<Painting::PaintableBox&>(*node.paintable());
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CSSPixelPoint offset;
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if (used_values.containing_line_box_fragment.has_value()) {
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// Atomic inline case:
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// We know that `node` is an atomic inline because `containing_line_box_fragments` refers to the
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// line box fragment in the parent block container that contains it.
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auto const& containing_line_box_fragment = used_values.containing_line_box_fragment.value();
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auto const& containing_block = *node.containing_block();
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auto const& containing_block_paintable = verify_cast<Painting::PaintableWithLines>(*containing_block.paintable_box());
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auto const& fragment = containing_block_paintable.line_boxes()[containing_line_box_fragment.line_box_index].fragments()[containing_line_box_fragment.fragment_index];
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// The fragment has the final offset for the atomic inline, so we just need to copy it from there.
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offset = fragment.offset();
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} else {
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// Not an atomic inline, much simpler case.
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offset = used_values.offset;
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}
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// Apply relative position inset if appropriate.
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if (node.computed_values().position() == CSS::Positioning::Relative && is<NodeWithStyleAndBoxModelMetrics>(node)) {
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auto& inset = static_cast<NodeWithStyleAndBoxModelMetrics const&>(node).box_model().inset;
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offset.translate_by(inset.left, inset.top);
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}
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paintable.set_offset(offset);
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}
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// Line box fragments:
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for (auto const& paintable_with_lines : paintables_with_lines) {
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for (auto const& line_box : paintable_with_lines.line_boxes()) {
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for (auto& fragment : line_box.fragments()) {
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auto const& fragment_node = fragment.layout_node();
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if (!is<Layout::NodeWithStyleAndBoxModelMetrics>(*fragment_node.parent()))
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continue;
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// Collect effective relative position offset from inline-flow parent chain.
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CSSPixelPoint offset;
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for (auto* ancestor = fragment_node.parent(); ancestor; ancestor = ancestor->parent()) {
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if (!is<Layout::NodeWithStyleAndBoxModelMetrics>(*ancestor))
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break;
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if (!ancestor->display().is_inline_outside() || !ancestor->display().is_flow_inside())
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break;
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if (ancestor->computed_values().position() == CSS::Positioning::Relative) {
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auto const& ancestor_node = static_cast<Layout::NodeWithStyleAndBoxModelMetrics const&>(*ancestor);
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auto const& inset = ancestor_node.box_model().inset;
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offset.translate_by(inset.left, inset.top);
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}
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}
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const_cast<LineBoxFragment&>(fragment).set_offset(fragment.offset().translated(offset));
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}
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}
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}
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}
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static void build_paint_tree(Node& node, Painting::Paintable* parent_paintable = nullptr)
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{
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Painting::Paintable* paintable = nullptr;
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if (node.paintable()) {
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paintable = const_cast<Painting::Paintable*>(node.paintable());
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if (parent_paintable && !paintable->forms_unconnected_subtree()) {
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VERIFY(!paintable->parent());
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parent_paintable->append_child(*paintable);
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}
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paintable->set_dom_node(node.dom_node());
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if (node.dom_node())
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node.dom_node()->set_paintable(paintable);
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}
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for (auto* child = node.first_child(); child; child = child->next_sibling()) {
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build_paint_tree(*child, paintable);
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}
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}
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void LayoutState::commit(Box& root)
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{
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// Only the top-level LayoutState should ever be committed.
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VERIFY(!m_parent);
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// NOTE: In case this is a relayout of an existing tree, we start by detaching the old paint tree
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// from the layout tree. This is done to ensure that we don't end up with any old-tree pointers
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// when text paintables shift around in the tree.
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root.for_each_in_inclusive_subtree_of_type<Layout::TextNode>([&](Layout::TextNode& text_node) {
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text_node.set_paintable(nullptr);
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return IterationDecision::Continue;
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});
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HashTable<Layout::TextNode*> text_nodes;
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Vector<Painting::PaintableWithLines&> paintables_with_lines;
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for (auto& it : used_values_per_layout_node) {
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auto& used_values = *it.value;
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auto& node = const_cast<NodeWithStyle&>(used_values.node());
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if (is<NodeWithStyleAndBoxModelMetrics>(node)) {
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// Transfer box model metrics.
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auto& box_model = static_cast<NodeWithStyleAndBoxModelMetrics&>(node).box_model();
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box_model.inset = { used_values.inset_top, used_values.inset_right, used_values.inset_bottom, used_values.inset_left };
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box_model.padding = { used_values.padding_top, used_values.padding_right, used_values.padding_bottom, used_values.padding_left };
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box_model.border = { used_values.border_top, used_values.border_right, used_values.border_bottom, used_values.border_left };
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box_model.margin = { used_values.margin_top, used_values.margin_right, used_values.margin_bottom, used_values.margin_left };
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}
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auto paintable = node.create_paintable();
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node.set_paintable(paintable);
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// For boxes, transfer all the state needed for painting.
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if (paintable && is<Painting::PaintableBox>(*paintable)) {
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auto& paintable_box = static_cast<Painting::PaintableBox&>(*paintable);
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paintable_box.set_offset(used_values.offset);
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paintable_box.set_content_size(used_values.content_width(), used_values.content_height());
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if (used_values.override_borders_data().has_value()) {
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paintable_box.set_override_borders_data(used_values.override_borders_data().value());
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}
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if (used_values.table_cell_coordinates().has_value()) {
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paintable_box.set_table_cell_coordinates(used_values.table_cell_coordinates().value());
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}
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if (is<Painting::PaintableWithLines>(paintable_box)) {
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auto& paintable_with_lines = static_cast<Painting::PaintableWithLines&>(paintable_box);
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paintable_with_lines.set_line_boxes(move(used_values.line_boxes));
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paintables_with_lines.append(paintable_with_lines);
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}
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if (used_values.computed_svg_transforms().has_value() && is<Painting::SVGGraphicsPaintable>(paintable_box)) {
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auto& svg_graphics_paintable = static_cast<Painting::SVGGraphicsPaintable&>(paintable_box);
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svg_graphics_paintable.set_computed_transforms(*used_values.computed_svg_transforms());
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}
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if (used_values.computed_svg_path().has_value() && is<Painting::SVGGeometryPaintable>(paintable_box)) {
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auto& svg_geometry_paintable = static_cast<Painting::SVGGeometryPaintable&>(paintable_box);
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svg_geometry_paintable.set_computed_path(move(*used_values.computed_svg_path()));
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}
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}
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}
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resolve_relative_positions(paintables_with_lines);
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// Make a pass over all the line boxes to:
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// - Measure absolute rect of each line box.
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// - Collect all text nodes, so we can create paintables for them later.
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for (auto& paintable_with_lines : paintables_with_lines) {
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for (auto& line_box : paintable_with_lines.line_boxes()) {
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CSSPixelRect line_box_absolute_rect;
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for (auto const& fragment : line_box.fragments()) {
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line_box_absolute_rect = line_box_absolute_rect.united(fragment.absolute_rect());
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if (fragment.layout_node().is_text_node())
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text_nodes.set(static_cast<Layout::TextNode*>(const_cast<Layout::Node*>(&fragment.layout_node())));
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}
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const_cast<LineBox&>(line_box).set_absolute_rect(line_box_absolute_rect);
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}
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}
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for (auto* text_node : text_nodes)
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text_node->set_paintable(text_node->create_paintable());
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build_paint_tree(root);
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// Measure overflow in scroll containers.
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for (auto& it : used_values_per_layout_node) {
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auto& used_values = *it.value;
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if (!used_values.node().is_box())
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continue;
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auto const& box = static_cast<Layout::Box const&>(used_values.node());
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measure_scrollable_overflow(box);
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}
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}
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void LayoutState::UsedValues::set_node(NodeWithStyle& node, UsedValues const* containing_block_used_values)
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{
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m_node = &node;
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// NOTE: In the code below, we decide if `node` has definite width and/or height.
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// This attempts to cover all the *general* cases where CSS considers sizes to be definite.
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// If `node` has definite values for min/max-width or min/max-height and a definite
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// preferred size in the same axis, we clamp the preferred size here as well.
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//
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// There are additional cases where CSS considers values to be definite. We model all of
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// those by having our engine consider sizes to be definite *once they are assigned to
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// the UsedValues by calling set_content_width() or set_content_height().
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auto const& computed_values = node.computed_values();
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auto adjust_for_box_sizing = [&](CSSPixels unadjusted_pixels, CSS::Size const& computed_size, bool width) -> CSSPixels {
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// box-sizing: content-box and/or automatic size don't require any adjustment.
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if (computed_values.box_sizing() == CSS::BoxSizing::ContentBox || computed_size.is_auto())
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return unadjusted_pixels;
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// box-sizing: border-box requires us to subtract the relevant border and padding from the size.
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CSSPixels border_and_padding;
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if (width) {
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border_and_padding = computed_values.border_left().width
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+ computed_values.padding().left().to_px(*m_node, containing_block_used_values->content_width())
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+ computed_values.border_right().width
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+ computed_values.padding().right().to_px(*m_node, containing_block_used_values->content_width());
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} else {
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border_and_padding = computed_values.border_top().width
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+ computed_values.padding().top().to_px(*m_node, containing_block_used_values->content_width())
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+ computed_values.border_bottom().width
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+ computed_values.padding().bottom().to_px(*m_node, containing_block_used_values->content_width());
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}
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return unadjusted_pixels - border_and_padding;
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};
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auto is_definite_size = [&](CSS::Size const& size, CSSPixels& resolved_definite_size, bool width) {
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// A size that can be determined without performing layout; that is,
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// a <length>,
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// a measure of text (without consideration of line-wrapping),
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// a size of the initial containing block,
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// or a <percentage> or other formula (such as the “stretch-fit” sizing of non-replaced blocks [CSS2]) that is resolved solely against definite sizes.
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auto containing_block_has_definite_size = containing_block_used_values ? (width ? containing_block_used_values->has_definite_width() : containing_block_used_values->has_definite_height()) : false;
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if (size.is_auto()) {
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// NOTE: The width of a non-flex-item block is considered definite if it's auto and the containing block has definite width.
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if (width
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&& !node.is_floating()
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&& !node.is_absolutely_positioned()
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&& node.display().is_block_outside()
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&& node.parent()
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&& !node.parent()->is_floating()
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&& (node.parent()->display().is_flow_root_inside()
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|| node.parent()->display().is_flow_inside())) {
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if (containing_block_has_definite_size) {
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CSSPixels available_width = containing_block_used_values->content_width();
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resolved_definite_size = available_width
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- margin_left
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- margin_right
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- padding_left
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- padding_right
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- border_left
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- border_right;
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return true;
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}
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return false;
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}
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return false;
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}
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if (size.is_calculated()) {
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if (size.calculated().contains_percentage()) {
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if (!containing_block_has_definite_size)
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return false;
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auto containing_block_size_as_length = width ? containing_block_used_values->content_width() : containing_block_used_values->content_height();
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resolved_definite_size = adjust_for_box_sizing(size.calculated().resolve_length_percentage(node, containing_block_size_as_length).value_or(CSS::Length::make_auto()).to_px(node), size, width);
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return true;
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}
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resolved_definite_size = adjust_for_box_sizing(size.calculated().resolve_length(node)->to_px(node), size, width);
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return true;
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}
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if (size.is_length()) {
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VERIFY(!size.is_auto()); // This should have been covered by the Size::is_auto() branch above.
|
||
resolved_definite_size = adjust_for_box_sizing(size.length().to_px(node), size, width);
|
||
return true;
|
||
}
|
||
if (size.is_percentage()) {
|
||
if (containing_block_has_definite_size) {
|
||
auto containing_block_size = width ? containing_block_used_values->content_width() : containing_block_used_values->content_height();
|
||
resolved_definite_size = adjust_for_box_sizing(containing_block_size.scaled(size.percentage().as_fraction()), size, width);
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
// FIXME: Determine if calc() value is definite.
|
||
return false;
|
||
};
|
||
|
||
CSSPixels min_width = 0;
|
||
bool has_definite_min_width = is_definite_size(computed_values.min_width(), min_width, true);
|
||
CSSPixels max_width = 0;
|
||
bool has_definite_max_width = is_definite_size(computed_values.max_width(), max_width, true);
|
||
|
||
CSSPixels min_height = 0;
|
||
bool has_definite_min_height = is_definite_size(computed_values.min_height(), min_height, false);
|
||
CSSPixels max_height = 0;
|
||
bool has_definite_max_height = is_definite_size(computed_values.max_height(), max_height, false);
|
||
|
||
m_has_definite_width = is_definite_size(computed_values.width(), m_content_width, true);
|
||
m_has_definite_height = is_definite_size(computed_values.height(), m_content_height, false);
|
||
|
||
if (m_has_definite_width) {
|
||
if (has_definite_min_width)
|
||
m_content_width = max(min_width, m_content_width);
|
||
if (has_definite_max_width)
|
||
m_content_width = min(max_width, m_content_width);
|
||
}
|
||
|
||
if (m_has_definite_height) {
|
||
if (has_definite_min_height)
|
||
m_content_height = max(min_height, m_content_height);
|
||
if (has_definite_max_height)
|
||
m_content_height = min(max_height, m_content_height);
|
||
}
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_content_width(CSSPixels width)
|
||
{
|
||
VERIFY(!width.might_be_saturated());
|
||
if (width < 0) {
|
||
// Negative widths are not allowed in CSS. We have a bug somewhere! Clamp to 0 to avoid doing too much damage.
|
||
dbgln_if(LIBWEB_CSS_DEBUG, "FIXME: Layout calculated a negative width for {}: {}", m_node->debug_description(), width);
|
||
width = 0;
|
||
}
|
||
m_content_width = width;
|
||
m_has_definite_width = true;
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_content_height(CSSPixels height)
|
||
{
|
||
VERIFY(!height.might_be_saturated());
|
||
if (height < 0) {
|
||
// Negative heights are not allowed in CSS. We have a bug somewhere! Clamp to 0 to avoid doing too much damage.
|
||
dbgln_if(LIBWEB_CSS_DEBUG, "FIXME: Layout calculated a negative height for {}: {}", m_node->debug_description(), height);
|
||
height = 0;
|
||
}
|
||
m_content_height = height;
|
||
m_has_definite_height = true;
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_temporary_content_width(CSSPixels width)
|
||
{
|
||
m_content_width = width;
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_temporary_content_height(CSSPixels height)
|
||
{
|
||
m_content_height = height;
|
||
}
|
||
|
||
AvailableSize LayoutState::UsedValues::available_width_inside() const
|
||
{
|
||
if (width_constraint == SizeConstraint::MinContent)
|
||
return AvailableSize::make_min_content();
|
||
if (width_constraint == SizeConstraint::MaxContent)
|
||
return AvailableSize::make_max_content();
|
||
if (has_definite_width())
|
||
return AvailableSize::make_definite(m_content_width);
|
||
return AvailableSize::make_indefinite();
|
||
}
|
||
|
||
AvailableSize LayoutState::UsedValues::available_height_inside() const
|
||
{
|
||
if (height_constraint == SizeConstraint::MinContent)
|
||
return AvailableSize::make_min_content();
|
||
if (height_constraint == SizeConstraint::MaxContent)
|
||
return AvailableSize::make_max_content();
|
||
if (has_definite_height())
|
||
return AvailableSize::make_definite(m_content_height);
|
||
return AvailableSize::make_indefinite();
|
||
}
|
||
|
||
AvailableSpace LayoutState::UsedValues::available_inner_space_or_constraints_from(AvailableSpace const& outer_space) const
|
||
{
|
||
auto inner_width = available_width_inside();
|
||
auto inner_height = available_height_inside();
|
||
|
||
if (inner_width.is_indefinite() && outer_space.width.is_intrinsic_sizing_constraint())
|
||
inner_width = outer_space.width;
|
||
if (inner_height.is_indefinite() && outer_space.height.is_intrinsic_sizing_constraint())
|
||
inner_height = outer_space.height;
|
||
return AvailableSpace(inner_width, inner_height);
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_content_offset(CSSPixelPoint new_offset)
|
||
{
|
||
set_content_x(new_offset.x());
|
||
set_content_y(new_offset.y());
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_content_x(CSSPixels x)
|
||
{
|
||
offset.set_x(x);
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_content_y(CSSPixels y)
|
||
{
|
||
offset.set_y(y);
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_indefinite_content_width()
|
||
{
|
||
m_has_definite_width = false;
|
||
}
|
||
|
||
void LayoutState::UsedValues::set_indefinite_content_height()
|
||
{
|
||
m_has_definite_height = false;
|
||
}
|
||
|
||
}
|