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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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141
Userland/Libraries/LibWeb/Painting/PaintableFragment.cpp Normal file
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/*
* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/DOM/Range.h>
#include <LibWeb/Layout/Viewport.h>
#include <LibWeb/Painting/PaintableBox.h>
namespace Web::Painting {
PaintableFragment::PaintableFragment(Layout::LineBoxFragment const& fragment)
: m_layout_node(fragment.layout_node())
, m_offset(fragment.offset())
, m_size(fragment.size())
, m_baseline(fragment.baseline())
, m_start(fragment.start())
, m_length(fragment.length())
, m_glyph_run(fragment.glyph_run())
{
}
CSSPixelRect const PaintableFragment::absolute_rect() const
{
CSSPixelRect rect { {}, size() };
rect.set_location(m_layout_node->containing_block()->paintable_box()->absolute_position());
rect.translate_by(offset());
return rect;
}
int PaintableFragment::text_index_at(CSSPixels x) const
{
if (!is<Layout::TextNode>(*m_layout_node))
return 0;
auto& layout_text = verify_cast<Layout::TextNode>(layout_node());
auto& font = layout_text.first_available_font();
Utf8View view(layout_text.text_for_rendering().bytes_as_string_view().substring_view(m_start, m_length));
CSSPixels relative_x = x - absolute_rect().x();
CSSPixels glyph_spacing = font.glyph_spacing();
if (relative_x < 0)
return 0;
CSSPixels width_so_far = 0;
for (auto it = view.begin(); it != view.end(); ++it) {
auto previous_it = it;
CSSPixels glyph_width = CSSPixels::nearest_value_for(font.glyph_or_emoji_width(it));
if ((width_so_far + glyph_width + glyph_spacing / 2) > relative_x)
return m_start + view.byte_offset_of(previous_it);
width_so_far += glyph_width + glyph_spacing;
}
return m_start + m_length;
}
CSSPixelRect PaintableFragment::selection_rect(Gfx::Font const& font) const
{
if (layout_node().selection_state() == Layout::Node::SelectionState::None)
return {};
if (layout_node().selection_state() == Layout::Node::SelectionState::Full)
return absolute_rect();
if (!is<Layout::TextNode>(layout_node()))
return {};
auto selection = layout_node().root().selection();
if (!selection)
return {};
auto range = selection->range();
if (!range)
return {};
// FIXME: m_start and m_length should be unsigned and then we won't need these casts.
auto const start_index = static_cast<unsigned>(m_start);
auto const end_index = static_cast<unsigned>(m_start) + static_cast<unsigned>(m_length);
auto& layout_text = verify_cast<Layout::TextNode>(layout_node());
auto text = layout_text.text_for_rendering().bytes_as_string_view().substring_view(m_start, m_length);
if (layout_node().selection_state() == Layout::Node::SelectionState::StartAndEnd) {
// we are in the start/end node (both the same)
if (start_index > range->end_offset())
return {};
if (end_index < range->start_offset())
return {};
if (range->start_offset() == range->end_offset())
return {};
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = min(m_length, range->end_offset() - m_start);
auto pixel_distance_to_first_selected_character = CSSPixels::nearest_value_for(font.width(text.substring_view(0, selection_start_in_this_fragment)));
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;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
if (layout_node().selection_state() == Layout::Node::SelectionState::Start) {
// we are in the start node
if (end_index < range->start_offset())
return {};
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = m_length;
auto pixel_distance_to_first_selected_character = CSSPixels::nearest_value_for(font.width(text.substring_view(0, selection_start_in_this_fragment)));
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;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
if (layout_node().selection_state() == Layout::Node::SelectionState::End) {
// we are in the end node
if (start_index > range->end_offset())
return {};
auto selection_start_in_this_fragment = 0;
auto selection_end_in_this_fragment = min(range->end_offset() - m_start, m_length);
auto pixel_distance_to_first_selected_character = CSSPixels::nearest_value_for(font.width(text.substring_view(0, selection_start_in_this_fragment)));
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;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
return {};
}
}