2e4eebe4e5
Instead of computing and caching the transform matrix and transform origin on PaintableBox during resolve_paint_properties(), compute them inline during assign_accumulated_visual_contexts() where they are actually consumed. This makes PaintableBox smaller by not wasting space for properties that are only consumed during AccumulatedVisualContext tree construction.
483 lines
22 KiB
C++
483 lines
22 KiB
C++
/*
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* Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/VisualViewport.h>
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#include <LibWeb/DOM/Range.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/AccumulatedVisualContext.h>
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#include <LibWeb/Painting/Blending.h>
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#include <LibWeb/Painting/DisplayListRecorder.h>
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#include <LibWeb/Painting/ScrollFrame.h>
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#include <LibWeb/Painting/StackingContext.h>
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#include <LibWeb/Painting/ViewportPaintable.h>
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#include <LibWeb/Selection/Selection.h>
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namespace Web::Painting {
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GC_DEFINE_ALLOCATOR(ViewportPaintable);
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GC::Ref<ViewportPaintable> ViewportPaintable::create(Layout::Viewport const& layout_viewport)
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{
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return layout_viewport.heap().allocate<ViewportPaintable>(layout_viewport);
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}
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ViewportPaintable::ViewportPaintable(Layout::Viewport const& layout_viewport)
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: PaintableWithLines(layout_viewport)
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{
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}
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ViewportPaintable::~ViewportPaintable() = default;
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void ViewportPaintable::reset_for_relayout()
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{
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PaintableWithLines::reset_for_relayout();
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m_scroll_state.clear();
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m_scroll_state_snapshot = {};
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m_needs_to_refresh_scroll_state = true;
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m_paintable_boxes_with_auto_content_visibility.clear();
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m_next_accumulated_visual_context_id = 1;
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}
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void ViewportPaintable::build_stacking_context_tree_if_needed()
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{
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if (stacking_context())
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return;
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build_stacking_context_tree();
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}
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void ViewportPaintable::build_stacking_context_tree()
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{
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set_stacking_context(heap().allocate<StackingContext>(*this, nullptr, 0));
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size_t index_in_tree_order = 1;
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for_each_in_subtree_of_type<PaintableBox>([&](auto& paintable_box) {
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paintable_box.invalidate_stacking_context();
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auto* parent_context = paintable_box.enclosing_stacking_context();
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auto establishes_stacking_context = paintable_box.layout_node().establishes_stacking_context();
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if ((paintable_box.is_positioned() || establishes_stacking_context) && paintable_box.computed_values().z_index().value_or(0) == 0)
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parent_context->m_positioned_descendants_and_stacking_contexts_with_stack_level_0.append(paintable_box);
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if (!paintable_box.is_positioned() && paintable_box.is_floating())
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parent_context->m_non_positioned_floating_descendants.append(paintable_box);
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if (!establishes_stacking_context) {
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VERIFY(!paintable_box.stacking_context());
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return TraversalDecision::Continue;
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}
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VERIFY(parent_context);
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paintable_box.set_stacking_context(heap().allocate<StackingContext>(paintable_box, parent_context, index_in_tree_order++));
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return TraversalDecision::Continue;
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});
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stacking_context()->sort();
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}
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void ViewportPaintable::paint_all_phases(DisplayListRecordingContext& context)
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{
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build_stacking_context_tree_if_needed();
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context.display_list_recorder().save_layer();
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stacking_context()->paint(context);
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context.display_list_recorder().restore();
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}
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void ViewportPaintable::assign_scroll_frames()
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{
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auto precompute_sticky_constraints = [](ScrollFrame& sticky_frame, PaintableBox const& paintable_box) {
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auto nearest_scrolling_ancestor_frame = sticky_frame.nearest_scrolling_ancestor();
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if (!nearest_scrolling_ancestor_frame)
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return;
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auto const& scroll_ancestor_paintable = nearest_scrolling_ancestor_frame->paintable_box();
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auto sticky_border_box_rect = paintable_box.absolute_border_box_rect();
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auto const* containing_block_of_sticky = paintable_box.containing_block();
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CSSPixelRect containing_block_region;
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bool needs_parent_offset_adjustment = false;
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if (containing_block_of_sticky == &scroll_ancestor_paintable) {
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containing_block_region = { {}, containing_block_of_sticky->scrollable_overflow_rect()->size() };
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} else {
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containing_block_region = containing_block_of_sticky->absolute_border_box_rect()
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.translated(-scroll_ancestor_paintable.absolute_rect().top_left());
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needs_parent_offset_adjustment = true;
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}
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sticky_frame.set_sticky_constraints({
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.position_relative_to_scroll_ancestor = sticky_border_box_rect.top_left() - scroll_ancestor_paintable.absolute_rect().top_left(),
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.border_box_size = sticky_border_box_rect.size(),
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.containing_block_region = containing_block_region,
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.needs_parent_offset_adjustment = needs_parent_offset_adjustment,
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});
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};
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for_each_in_inclusive_subtree_of_type<PaintableBox>([&](auto& paintable_box) {
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RefPtr<ScrollFrame> sticky_scroll_frame;
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if (paintable_box.is_sticky_position()) {
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auto parent_scroll_frame = paintable_box.nearest_scroll_frame();
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sticky_scroll_frame = m_scroll_state.create_sticky_frame_for(paintable_box, parent_scroll_frame);
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precompute_sticky_constraints(*sticky_scroll_frame, paintable_box);
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paintable_box.set_enclosing_scroll_frame(sticky_scroll_frame);
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paintable_box.set_own_scroll_frame(sticky_scroll_frame);
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}
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if (paintable_box.has_scrollable_overflow() || is<ViewportPaintable>(paintable_box)) {
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RefPtr<ScrollFrame const> parent_scroll_frame;
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if (sticky_scroll_frame) {
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parent_scroll_frame = sticky_scroll_frame;
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} else {
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parent_scroll_frame = paintable_box.nearest_scroll_frame();
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}
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auto scroll_frame = m_scroll_state.create_scroll_frame_for(paintable_box, parent_scroll_frame);
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paintable_box.set_own_scroll_frame(scroll_frame);
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}
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return TraversalDecision::Continue;
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});
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for_each_in_subtree([&](auto& paintable) {
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if (paintable.is_fixed_position() || paintable.is_sticky_position())
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return TraversalDecision::Continue;
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for (auto block = paintable.containing_block(); block; block = block->containing_block()) {
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if (auto scroll_frame = block->own_scroll_frame(); scroll_frame) {
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if (auto* paintable_box = as_if<PaintableBox>(paintable))
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paintable_box->set_enclosing_scroll_frame(*scroll_frame);
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return TraversalDecision::Continue;
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}
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if (block->is_fixed_position()) {
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return TraversalDecision::Continue;
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}
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}
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VERIFY_NOT_REACHED();
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});
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}
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static CSSPixelRect effective_css_clip_rect(CSSPixelRect const& css_clip)
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{
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if (css_clip.width() < 0 || css_clip.height() < 0)
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return CSSPixelRect { 0, 0, 0, 0 };
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return css_clip;
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}
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static Optional<TransformData> compute_transform(PaintableBox const& paintable_box, CSS::ComputedValues const& computed_values)
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{
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if (!paintable_box.has_css_transform())
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return {};
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auto matrix = Gfx::FloatMatrix4x4::identity();
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if (auto const& translate = computed_values.translate())
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matrix = matrix * translate->to_matrix(paintable_box).release_value();
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if (auto const& rotate = computed_values.rotate())
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matrix = matrix * rotate->to_matrix(paintable_box).release_value();
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if (auto const& scale = computed_values.scale())
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matrix = matrix * scale->to_matrix(paintable_box).release_value();
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for (auto const& transform : computed_values.transformations())
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matrix = matrix * transform->to_matrix(paintable_box).release_value();
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auto const& css_transform_origin = computed_values.transform_origin();
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auto reference_box = paintable_box.transform_reference_box();
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auto origin_x = reference_box.left() + css_transform_origin.x.to_px(paintable_box.layout_node(), reference_box.width());
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auto origin_y = reference_box.top() + css_transform_origin.y.to_px(paintable_box.layout_node(), reference_box.height());
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return TransformData { matrix, { origin_x, origin_y } };
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}
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void ViewportPaintable::assign_accumulated_visual_contexts()
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{
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m_next_accumulated_visual_context_id = 1;
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auto append_node = [&](RefPtr<AccumulatedVisualContext const> parent, VisualContextData data) {
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return AccumulatedVisualContext::create(allocate_accumulated_visual_context_id(), move(data), parent);
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};
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// Create visual viewport transform as root (if not identity)
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m_visual_viewport_context = nullptr;
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auto transform = document().visual_viewport()->transform();
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if (!transform.is_identity()) {
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m_visual_viewport_context = append_node(nullptr, TransformData { transform.to_matrix(), CSSPixelPoint { 0, 0 } });
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}
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RefPtr<AccumulatedVisualContext const> viewport_state_for_descendants = m_visual_viewport_context;
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if (own_scroll_frame())
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viewport_state_for_descendants = append_node(m_visual_viewport_context, ScrollData { own_scroll_frame()->id(), false });
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set_accumulated_visual_context(nullptr);
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set_accumulated_visual_context_for_descendants(viewport_state_for_descendants);
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for_each_in_subtree_of_type<PaintableBox>([&](auto& paintable_box) {
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auto* visual_parent = as_if<PaintableBox>(paintable_box.parent());
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if (!visual_parent)
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return TraversalDecision::Continue;
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RefPtr<AccumulatedVisualContext const> inherited_state;
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if (paintable_box.is_fixed_position()) {
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inherited_state = m_visual_viewport_context;
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} else if (paintable_box.is_absolutely_positioned()) {
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// For position: absolute, use containing block's state to correctly escape scroll containers.
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// NOTE: transforms/perspectives can't be in intermediates for abspos because they establish
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// containing blocks, so no intermediate walk is needed.
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inherited_state = paintable_box.containing_block()->accumulated_visual_context_for_descendants();
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} else {
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// For position: relative/static, use visual parent's state directly.
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// This avoids duplicate transform/perspective allocations that would occur with
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// the containing block + intermediate walk approach.
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inherited_state = visual_parent->accumulated_visual_context_for_descendants();
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}
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// Build this element's own state from inherited state.
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RefPtr<AccumulatedVisualContext const> own_state = inherited_state;
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if (paintable_box.is_sticky_position()) {
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// For sticky elements, use enclosing_scroll_frame which holds the sticky frame.
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// own_scroll_frame may be a different scroll frame if the sticky element also has scrollable overflow.
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if (auto sticky_frame = paintable_box.enclosing_scroll_frame(); sticky_frame && sticky_frame->is_sticky())
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own_state = append_node(own_state, ScrollData { sticky_frame->id(), true });
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}
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auto const& computed_values = paintable_box.computed_values();
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EffectsData effects {
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computed_values.opacity(),
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mix_blend_mode_to_compositing_and_blending_operator(computed_values.mix_blend_mode()),
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paintable_box.filter(),
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computed_values.isolation() == CSS::Isolation::Isolate
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};
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if (effects.needs_layer())
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own_state = append_node(own_state, move(effects));
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if (auto transform_data = compute_transform(paintable_box, computed_values); transform_data.has_value())
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own_state = append_node(own_state, *transform_data);
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if (auto css_clip = paintable_box.get_clip_rect(); css_clip.has_value())
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own_state = append_node(own_state, ClipData { effective_css_clip_rect(*css_clip), {} });
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// FIXME: Support other geometry boxes. See: https://drafts.fxtf.org/css-masking/#typedef-geometry-box
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if (auto const& clip_path = computed_values.clip_path(); clip_path.has_value() && clip_path->is_basic_shape()) {
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auto masking_area = paintable_box.absolute_border_box_rect();
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auto reference_box = CSSPixelRect { {}, masking_area.size() };
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auto const& basic_shape = clip_path->basic_shape();
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auto path = basic_shape.to_path(reference_box, paintable_box.layout_node());
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path.offset(masking_area.top_left().template to_type<float>());
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auto fill_rule = basic_shape.basic_shape().visit(
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[](CSS::Polygon const& polygon) { return polygon.fill_rule; },
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[](CSS::Path const& path) { return path.fill_rule; },
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[](auto const&) { return Gfx::WindingRule::Nonzero; });
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own_state = append_node(own_state, ClipPathData { move(path), masking_area, fill_rule });
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}
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paintable_box.set_accumulated_visual_context(own_state);
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// Build state for descendants: own state + perspective + clip + scroll.
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RefPtr<AccumulatedVisualContext const> state_for_descendants = own_state;
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if (auto perspective = paintable_box.perspective_matrix(); perspective.has_value())
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state_for_descendants = append_node(state_for_descendants, PerspectiveData { *perspective });
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auto overflow_x = computed_values.overflow_x();
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auto overflow_y = computed_values.overflow_y();
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auto has_hidden_overflow = overflow_x != CSS::Overflow::Visible || overflow_y != CSS::Overflow::Visible;
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if (has_hidden_overflow || paintable_box.layout_node().has_paint_containment()) {
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bool clip_x = overflow_x != CSS::Overflow::Visible;
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bool clip_y = overflow_y != CSS::Overflow::Visible;
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if (paintable_box.layout_node().has_paint_containment()) {
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clip_x = true;
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clip_y = true;
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}
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if (clip_x || clip_y) {
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auto clip_rect = paintable_box.overflow_clip_edge_rect();
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if (!clip_x) {
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clip_rect.set_left(0);
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clip_rect.set_right(CSSPixels::max_integer_value);
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}
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if (!clip_y) {
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clip_rect.set_top(0);
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clip_rect.set_bottom(CSSPixels::max_integer_value);
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}
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auto radii = (clip_x && clip_y) ? paintable_box.normalized_border_radii_data(ShrinkRadiiForBorders::Yes) : BorderRadiiData {};
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state_for_descendants = append_node(state_for_descendants, ClipData { clip_rect, radii });
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}
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}
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if (paintable_box.own_scroll_frame() && !paintable_box.is_sticky_position())
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state_for_descendants = append_node(state_for_descendants, ScrollData { paintable_box.own_scroll_frame()->id(), false });
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paintable_box.set_accumulated_visual_context_for_descendants(state_for_descendants);
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return TraversalDecision::Continue;
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});
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}
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void ViewportPaintable::refresh_scroll_state()
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{
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if (!m_needs_to_refresh_scroll_state)
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return;
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m_needs_to_refresh_scroll_state = false;
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m_scroll_state.for_each_sticky_frame([&](auto& scroll_frame) {
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auto nearest_scrolling_ancestor_frame = scroll_frame->nearest_scrolling_ancestor();
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if (!nearest_scrolling_ancestor_frame || !scroll_frame->has_sticky_constraints())
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return;
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auto const& sticky_data = scroll_frame->sticky_constraints();
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auto const& sticky_insets = scroll_frame->paintable_box().sticky_insets();
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auto const& scroll_ancestor_paintable = nearest_scrolling_ancestor_frame->paintable_box();
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// For nested sticky elements, the parent sticky's offset is applied via cumulative_offset.
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// We need to adjust all position calculations to account for this, so we work in the
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// coordinate space where the parent sticky is at its current (offset) position.
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CSSPixelPoint parent_sticky_offset;
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if (auto parent = scroll_frame->parent(); parent && parent->is_sticky())
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parent_sticky_offset = parent->cumulative_offset();
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auto sticky_position_in_ancestor = sticky_data.position_relative_to_scroll_ancestor + parent_sticky_offset;
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auto containing_block_region = sticky_data.containing_block_region;
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if (sticky_data.needs_parent_offset_adjustment)
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containing_block_region.translate_by(parent_sticky_offset);
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CSSPixelPoint min_offset_within_containing_block = containing_block_region.top_left();
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CSSPixelPoint max_offset_within_containing_block = {
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containing_block_region.right() - sticky_data.border_box_size.width(),
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containing_block_region.bottom() - sticky_data.border_box_size.height()
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};
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CSSPixelRect scrollport_rect { scroll_ancestor_paintable.scroll_offset(), scroll_ancestor_paintable.absolute_rect().size() };
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CSSPixelPoint sticky_offset;
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if (sticky_insets.top.has_value()) {
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if (scrollport_rect.top() > sticky_position_in_ancestor.y() - *sticky_insets.top)
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sticky_offset.set_y(min(scrollport_rect.top() + *sticky_insets.top, max_offset_within_containing_block.y()) - sticky_position_in_ancestor.y());
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}
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if (sticky_insets.left.has_value()) {
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if (scrollport_rect.left() > sticky_position_in_ancestor.x() - *sticky_insets.left)
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sticky_offset.set_x(min(scrollport_rect.left() + *sticky_insets.left, max_offset_within_containing_block.x()) - sticky_position_in_ancestor.x());
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}
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if (sticky_insets.bottom.has_value()) {
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if (scrollport_rect.bottom() < sticky_position_in_ancestor.y() + sticky_data.border_box_size.height() + *sticky_insets.bottom)
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sticky_offset.set_y(max(scrollport_rect.bottom() - sticky_data.border_box_size.height() - *sticky_insets.bottom, min_offset_within_containing_block.y()) - sticky_position_in_ancestor.y());
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}
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if (sticky_insets.right.has_value()) {
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if (scrollport_rect.right() < sticky_position_in_ancestor.x() + sticky_data.border_box_size.width() + *sticky_insets.right)
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sticky_offset.set_x(max(scrollport_rect.right() - sticky_data.border_box_size.width() - *sticky_insets.right, min_offset_within_containing_block.x()) - sticky_position_in_ancestor.x());
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}
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scroll_frame->set_own_offset(sticky_offset);
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});
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m_scroll_state.for_each_scroll_frame([&](auto& scroll_frame) {
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scroll_frame->set_own_offset(-scroll_frame->paintable_box().scroll_offset());
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});
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m_scroll_state_snapshot = m_scroll_state.snapshot();
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}
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static void resolve_paint_only_properties_in_subtree(Paintable& root)
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{
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root.for_each_in_inclusive_subtree([&](auto& paintable) {
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paintable.resolve_paint_properties();
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paintable.set_needs_paint_only_properties_update(false);
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return TraversalDecision::Continue;
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});
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}
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void ViewportPaintable::resolve_paint_only_properties()
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{
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// Resolves layout-dependent properties not handled during layout and stores them in the paint tree.
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// Properties resolved include:
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// - Border radii
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// - Box shadows
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// - Text shadows
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// - Transforms
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// - Transform origins
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// - Outlines
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for_each_in_inclusive_subtree([&](Paintable& paintable) {
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if (paintable.needs_paint_only_properties_update()) {
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resolve_paint_only_properties_in_subtree(paintable);
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return TraversalDecision::SkipChildrenAndContinue;
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|
}
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|
return TraversalDecision::Continue;
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|
});
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|
}
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|
|
|
GC::Ptr<Selection::Selection> ViewportPaintable::selection() const
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|
{
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|
return document().get_selection();
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|
}
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|
|
|
void ViewportPaintable::recompute_selection_states(DOM::Range& range)
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|
{
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|
// 1. Start by resetting the selection state of all layout nodes to None.
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|
for_each_in_inclusive_subtree([&](auto& layout_node) {
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|
layout_node.set_selection_state(SelectionState::None);
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|
return TraversalDecision::Continue;
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|
});
|
|
|
|
auto start_container = range.start_container();
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|
auto end_container = range.end_container();
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|
|
|
// 2. If the selection starts and ends in the same node:
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|
if (start_container == end_container) {
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|
// 1. If the selection starts and ends at the same offset, return.
|
|
if (range.start_offset() == range.end_offset()) {
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|
// NOTE: A zero-length selection should not be visible.
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|
return;
|
|
}
|
|
|
|
// 2. If it's a text node, mark it as StartAndEnd and return.
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|
if (is<DOM::Text>(*start_container) && !range.start().node->is_inert()) {
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|
if (auto* paintable = start_container->paintable())
|
|
paintable->set_selection_state(SelectionState::StartAndEnd);
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|
return;
|
|
}
|
|
}
|
|
|
|
// 3. Mark the selection start node as Start (if text) or Full (if anything else).
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|
if (auto* paintable = start_container->paintable(); paintable && !range.start().node->is_inert()) {
|
|
if (is<DOM::Text>(*start_container))
|
|
paintable->set_selection_state(SelectionState::Start);
|
|
else
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|
paintable->set_selection_state(SelectionState::Full);
|
|
}
|
|
|
|
// 4. Mark the nodes between the start and end of the selection as Full.
|
|
auto* start_at = start_container->child_at_index(range.start_offset());
|
|
// If the start container has no child at that index, we need to start on the node right after the start container.
|
|
if (!start_at) {
|
|
if (auto* last_child = start_container->last_child()) {
|
|
start_at = last_child->next_in_pre_order();
|
|
} else {
|
|
start_at = start_container->next_in_pre_order();
|
|
}
|
|
}
|
|
|
|
DOM::Node* stop_at = end_container->child_at_index(range.end_offset());
|
|
// Only stop at the end container if it has no children that may need to be included.
|
|
for (auto* node = start_at; node && (node != stop_at && !(node == end_container && !end_container->has_children())); node = node->next_in_pre_order(end_container)) {
|
|
if (node->is_inert())
|
|
continue;
|
|
if (auto* paintable = node->paintable())
|
|
paintable->set_selection_state(SelectionState::Full);
|
|
}
|
|
|
|
// 5. Mark the selection end node as End if it is a text node.
|
|
if (auto* paintable = end_container->paintable(); paintable && !range.end().node->is_inert() && is<DOM::Text>(*end_container)) {
|
|
paintable->set_selection_state(SelectionState::End);
|
|
}
|
|
}
|
|
|
|
bool ViewportPaintable::handle_mousewheel(Badge<EventHandler>, CSSPixelPoint, unsigned, unsigned, int, int)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
void ViewportPaintable::visit_edges(Visitor& visitor)
|
|
{
|
|
Base::visit_edges(visitor);
|
|
visitor.visit(m_paintable_boxes_with_auto_content_visibility);
|
|
}
|
|
|
|
}
|