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LibWeb: Use separate structure to represent fragments in paintable tree
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.
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401 changed files with 2122 additions and 3614 deletions
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@ -7,8 +7,6 @@
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#include <AK/Utf8View.h>
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#include <LibWeb/DOM/Range.h>
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#include <LibWeb/Layout/LayoutState.h>
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#include <LibWeb/Layout/LineBoxFragment.h>
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#include <LibWeb/Layout/TextNode.h>
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#include <LibWeb/Layout/Viewport.h>
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#include <ctype.h>
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@ -42,113 +40,6 @@ CSSPixelRect const LineBoxFragment::absolute_rect() const
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return rect;
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}
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int LineBoxFragment::text_index_at(CSSPixels x) const
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{
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if (!is<TextNode>(layout_node()))
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return 0;
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auto& layout_text = verify_cast<TextNode>(layout_node());
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auto& font = layout_text.first_available_font();
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Utf8View view(text());
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CSSPixels relative_x = x - absolute_x();
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CSSPixels glyph_spacing = font.glyph_spacing();
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if (relative_x < 0)
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return 0;
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CSSPixels width_so_far = 0;
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for (auto it = view.begin(); it != view.end(); ++it) {
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auto previous_it = it;
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CSSPixels glyph_width = CSSPixels::nearest_value_for(font.glyph_or_emoji_width(it));
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if ((width_so_far + glyph_width + glyph_spacing / 2) > relative_x)
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return m_start + view.byte_offset_of(previous_it);
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width_so_far += glyph_width + glyph_spacing;
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}
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return m_start + m_length;
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}
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CSSPixelRect LineBoxFragment::selection_rect(Gfx::Font const& font) const
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{
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if (layout_node().selection_state() == Node::SelectionState::None)
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return {};
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if (layout_node().selection_state() == Node::SelectionState::Full)
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return absolute_rect();
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if (!is<TextNode>(layout_node()))
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return {};
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auto selection = layout_node().root().selection();
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if (!selection)
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return {};
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auto range = selection->range();
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if (!range)
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return {};
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// FIXME: m_start and m_length should be unsigned and then we won't need these casts.
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auto const start_index = static_cast<unsigned>(m_start);
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auto const end_index = static_cast<unsigned>(m_start) + static_cast<unsigned>(m_length);
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auto text = this->text();
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if (layout_node().selection_state() == Node::SelectionState::StartAndEnd) {
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// we are in the start/end node (both the same)
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if (start_index > range->end_offset())
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return {};
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if (end_index < range->start_offset())
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return {};
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if (range->start_offset() == range->end_offset())
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return {};
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auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
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auto selection_end_in_this_fragment = min(m_length, range->end_offset() - m_start);
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auto pixel_distance_to_first_selected_character = CSSPixels::nearest_value_for(font.width(text.substring_view(0, selection_start_in_this_fragment)));
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auto pixel_width_of_selection = CSSPixels::nearest_value_for(font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment))) + 1;
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auto rect = absolute_rect();
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rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
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rect.set_width(pixel_width_of_selection);
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return rect;
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}
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if (layout_node().selection_state() == Node::SelectionState::Start) {
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// we are in the start node
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if (end_index < range->start_offset())
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return {};
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auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
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auto selection_end_in_this_fragment = m_length;
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auto pixel_distance_to_first_selected_character = CSSPixels::nearest_value_for(font.width(text.substring_view(0, selection_start_in_this_fragment)));
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auto pixel_width_of_selection = CSSPixels::nearest_value_for(font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment))) + 1;
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auto rect = absolute_rect();
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rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
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rect.set_width(pixel_width_of_selection);
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return rect;
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}
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if (layout_node().selection_state() == Node::SelectionState::End) {
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// we are in the end node
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if (start_index > range->end_offset())
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return {};
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auto selection_start_in_this_fragment = 0;
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auto selection_end_in_this_fragment = min(range->end_offset() - m_start, m_length);
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auto pixel_distance_to_first_selected_character = CSSPixels::nearest_value_for(font.width(text.substring_view(0, selection_start_in_this_fragment)));
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auto pixel_width_of_selection = CSSPixels::nearest_value_for(font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment))) + 1;
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auto rect = absolute_rect();
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rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
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rect.set_width(pixel_width_of_selection);
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return rect;
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}
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return {};
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}
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bool LineBoxFragment::is_atomic_inline() const
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{
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return layout_node().is_replaced_box() || (layout_node().display().is_inline_outside() && !layout_node().display().is_flow_inside());
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