mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 09:49:15 +03:00
444 lines
24 KiB
C++
444 lines
24 KiB
C++
/*
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* Copyright (c) 2023, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/HashMap.h>
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#include <AK/QuickSort.h>
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#include <AK/Traits.h>
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#include <LibWeb/Layout/TableFormattingContext.h>
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#include <LibWeb/Painting/PaintableBox.h>
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#include <LibWeb/Painting/TableBordersPainting.h>
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struct CellCoordinates {
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size_t row_index;
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size_t column_index;
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bool operator==(CellCoordinates const& other) const
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{
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return row_index == other.row_index && column_index == other.column_index;
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}
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};
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namespace AK {
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template<>
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struct Traits<CellCoordinates> : public DefaultTraits<CellCoordinates> {
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static unsigned hash(CellCoordinates const& key) { return pair_int_hash(key.row_index, key.column_index); }
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};
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}
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namespace Web::Painting {
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static void collect_cell_boxes(Vector<PaintableBox const&>& cell_boxes, PaintableBox const& table_paintable)
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{
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table_paintable.for_each_child_of_type<PaintableBox>([&](auto& child) {
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if (child.display().is_table_cell()) {
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cell_boxes.append(child);
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} else {
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collect_cell_boxes(cell_boxes, child);
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}
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return IterationDecision::Continue;
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});
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}
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enum class EdgeDirection {
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Horizontal,
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Vertical,
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};
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struct DeviceBorderData {
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Color color { Color::Transparent };
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CSS::LineStyle line_style { CSS::LineStyle::None };
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DevicePixels width { 0 };
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};
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struct DeviceBorderDataWithElementKind {
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DeviceBorderData border_data;
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Painting::PaintableBox::ConflictingElementKind element_kind { Painting::PaintableBox::ConflictingElementKind::Cell };
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};
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struct DeviceBordersDataWithElementKind {
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DeviceBorderDataWithElementKind top;
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DeviceBorderDataWithElementKind right;
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DeviceBorderDataWithElementKind bottom;
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DeviceBorderDataWithElementKind left;
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};
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struct BorderEdgePaintingInfo {
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DevicePixelRect rect;
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DeviceBorderDataWithElementKind border_data_with_element_kind;
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EdgeDirection direction;
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Optional<size_t> row;
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Optional<size_t> column;
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};
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static Optional<size_t> row_index_for_element_kind(size_t index, Painting::PaintableBox::ConflictingElementKind element_kind)
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{
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switch (element_kind) {
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case Painting::PaintableBox::ConflictingElementKind::Cell:
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case Painting::PaintableBox::ConflictingElementKind::Row:
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case Painting::PaintableBox::ConflictingElementKind::RowGroup: {
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return index;
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}
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default:
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return {};
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}
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}
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static Optional<size_t> column_index_for_element_kind(size_t index, Painting::PaintableBox::ConflictingElementKind element_kind)
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{
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switch (element_kind) {
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case Painting::PaintableBox::ConflictingElementKind::Cell:
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case Painting::PaintableBox::ConflictingElementKind::Column:
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case Painting::PaintableBox::ConflictingElementKind::ColumnGroup: {
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return index;
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}
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default:
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return {};
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}
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}
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static DevicePixels half_ceil(DevicePixels width)
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{
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return ceil(static_cast<double>(width.value()) / 2);
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}
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static DevicePixels half_floor(DevicePixels width)
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{
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return floor(static_cast<double>(width.value()) / 2);
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}
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static BorderEdgePaintingInfo make_right_cell_edge(
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DevicePixelRect const& right_cell_rect,
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DevicePixelRect const& cell_rect,
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DeviceBordersDataWithElementKind const& borders_data,
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CellCoordinates const& coordinates)
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{
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auto connect_top_offset = half_ceil(borders_data.top.border_data.width);
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auto connect_excess_height = connect_top_offset + half_floor(borders_data.bottom.border_data.width);
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DevicePixelRect right_border_rect = {
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right_cell_rect.x() - half_ceil(borders_data.right.border_data.width),
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cell_rect.y() - connect_top_offset,
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borders_data.right.border_data.width,
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max(cell_rect.height(), right_cell_rect.height()) + connect_excess_height,
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};
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return BorderEdgePaintingInfo {
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.rect = right_border_rect,
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.border_data_with_element_kind = borders_data.right,
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.direction = EdgeDirection::Vertical,
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.row = row_index_for_element_kind(coordinates.row_index, borders_data.right.element_kind),
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.column = column_index_for_element_kind(coordinates.column_index, borders_data.right.element_kind),
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};
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}
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static BorderEdgePaintingInfo make_down_cell_edge(
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DevicePixelRect const& down_cell_rect,
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DevicePixelRect const& cell_rect,
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DeviceBordersDataWithElementKind const& borders_data,
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CellCoordinates const& coordinates)
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{
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auto connect_left_offset = half_ceil(borders_data.left.border_data.width);
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auto connect_excess_width = connect_left_offset + half_floor(borders_data.right.border_data.width);
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DevicePixelRect down_border_rect = {
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cell_rect.x() - connect_left_offset,
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down_cell_rect.y() - half_ceil(borders_data.bottom.border_data.width),
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max(cell_rect.width(), down_cell_rect.width()) + connect_excess_width,
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borders_data.bottom.border_data.width,
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};
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return BorderEdgePaintingInfo {
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.rect = down_border_rect,
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.border_data_with_element_kind = borders_data.bottom,
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.direction = EdgeDirection::Horizontal,
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.row = row_index_for_element_kind(coordinates.row_index, borders_data.bottom.element_kind),
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.column = column_index_for_element_kind(coordinates.column_index, borders_data.bottom.element_kind),
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};
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}
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static BorderEdgePaintingInfo make_first_row_top_cell_edge(DevicePixelRect const& cell_rect, DeviceBordersDataWithElementKind const& borders_data, CellCoordinates const& coordinates)
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{
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auto connect_left_offset = half_ceil(borders_data.left.border_data.width.value());
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auto connect_excess_width = connect_left_offset + half_floor(borders_data.right.border_data.width.value());
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DevicePixelRect top_border_rect = {
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cell_rect.x() - connect_left_offset,
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cell_rect.y() - half_ceil(borders_data.top.border_data.width.value()),
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cell_rect.width() + connect_excess_width,
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borders_data.top.border_data.width,
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};
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return BorderEdgePaintingInfo {
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.rect = top_border_rect,
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.border_data_with_element_kind = borders_data.top,
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.direction = EdgeDirection::Horizontal,
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.row = row_index_for_element_kind(coordinates.row_index, borders_data.top.element_kind),
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.column = column_index_for_element_kind(coordinates.column_index, borders_data.top.element_kind),
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};
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}
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static BorderEdgePaintingInfo make_last_row_bottom_cell_edge(DevicePixelRect const& cell_rect, DeviceBordersDataWithElementKind const& borders_data, CellCoordinates const& coordinates)
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{
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auto connect_left_offset = half_ceil(borders_data.left.border_data.width);
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auto connect_excess_width = connect_left_offset + half_floor(borders_data.right.border_data.width);
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DevicePixelRect bottom_border_rect = {
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cell_rect.x() - connect_left_offset,
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cell_rect.y() + cell_rect.height() - half_ceil(borders_data.bottom.border_data.width),
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cell_rect.width() + connect_excess_width,
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borders_data.bottom.border_data.width,
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};
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return BorderEdgePaintingInfo {
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.rect = bottom_border_rect,
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.border_data_with_element_kind = borders_data.bottom,
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.direction = EdgeDirection::Horizontal,
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.row = row_index_for_element_kind(coordinates.row_index, borders_data.bottom.element_kind),
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.column = column_index_for_element_kind(coordinates.column_index, borders_data.bottom.element_kind),
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};
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}
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static BorderEdgePaintingInfo make_first_column_left_cell_edge(DevicePixelRect const& cell_rect, DeviceBordersDataWithElementKind const& borders_data, CellCoordinates const& coordinates)
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{
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auto connect_top_offset = half_ceil(borders_data.top.border_data.width);
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auto connect_excess_height = connect_top_offset + half_floor(borders_data.bottom.border_data.width);
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DevicePixelRect left_border_rect = {
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cell_rect.x() - half_ceil(borders_data.left.border_data.width),
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cell_rect.y() - connect_top_offset,
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borders_data.left.border_data.width,
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cell_rect.height() + connect_excess_height,
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};
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return BorderEdgePaintingInfo {
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.rect = left_border_rect,
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.border_data_with_element_kind = borders_data.left,
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.direction = EdgeDirection::Vertical,
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.row = row_index_for_element_kind(coordinates.row_index, borders_data.left.element_kind),
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.column = column_index_for_element_kind(coordinates.column_index, borders_data.left.element_kind),
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};
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}
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static BorderEdgePaintingInfo make_last_column_right_cell_edge(DevicePixelRect const& cell_rect, DeviceBordersDataWithElementKind const& borders_data, CellCoordinates const& coordinates)
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{
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auto connect_top_offset = half_ceil(borders_data.top.border_data.width);
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auto connect_excess_height = connect_top_offset + half_floor(borders_data.bottom.border_data.width);
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DevicePixelRect right_border_rect = {
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cell_rect.x() + cell_rect.width() - half_ceil(borders_data.right.border_data.width),
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cell_rect.y() - connect_top_offset,
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borders_data.right.border_data.width,
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cell_rect.height() + connect_excess_height,
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};
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return BorderEdgePaintingInfo {
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.rect = right_border_rect,
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.border_data_with_element_kind = borders_data.right,
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.direction = EdgeDirection::Vertical,
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.row = row_index_for_element_kind(coordinates.row_index, borders_data.right.element_kind),
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.column = column_index_for_element_kind(coordinates.column_index, borders_data.right.element_kind),
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};
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}
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static CSS::BorderData css_border_data_from_device_border_data(DeviceBorderData const& device_border_data)
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{
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return CSS::BorderData {
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.color = device_border_data.color,
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.line_style = device_border_data.line_style,
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.width = device_border_data.width.value(),
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};
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}
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static void paint_collected_edges(PaintContext& context, Vector<BorderEdgePaintingInfo>& border_edge_painting_info_list)
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{
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// This sorting step isn't part of the specification, but it matches the behavior of other browsers at border intersections, which aren't
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// part of border conflict resolution in the specification but it's still desirable to handle them in a way which is consistent with it.
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// See https://www.w3.org/TR/CSS22/tables.html#border-conflict-resolution for reference.
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quick_sort(border_edge_painting_info_list, [](auto const& a, auto const& b) {
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auto const& a_border_data = a.border_data_with_element_kind.border_data;
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auto const& b_border_data = b.border_data_with_element_kind.border_data;
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if (a_border_data.line_style == b_border_data.line_style && a_border_data.width == b_border_data.width) {
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if (b.border_data_with_element_kind.element_kind < a.border_data_with_element_kind.element_kind) {
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return true;
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} else if (b.border_data_with_element_kind.element_kind > a.border_data_with_element_kind.element_kind) {
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return false;
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}
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// Here the element kind is the same, thus the coordinates are either both set or not set.
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VERIFY(a.column.has_value() == b.column.has_value());
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VERIFY(a.row.has_value() == b.row.has_value());
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if (a.column.has_value()) {
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if (b.column.value() < a.column.value()) {
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return true;
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} else if (b.column.value() > a.column.value()) {
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return false;
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}
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}
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return a.row.has_value() ? b.row.value() < a.row.value() : false;
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}
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return Layout::TableFormattingContext::border_is_less_specific(
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css_border_data_from_device_border_data(a_border_data),
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css_border_data_from_device_border_data(b_border_data));
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});
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for (auto const& border_edge_painting_info : border_edge_painting_info_list) {
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auto const& border_data_with_element_kind = border_edge_painting_info.border_data_with_element_kind;
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auto width = border_data_with_element_kind.border_data.width;
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if (width <= 0)
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continue;
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auto color = border_data_with_element_kind.border_data.color;
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auto border_style = border_data_with_element_kind.border_data.line_style;
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auto p1 = border_edge_painting_info.rect.top_left();
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auto p2 = border_edge_painting_info.direction == EdgeDirection::Horizontal
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? border_edge_painting_info.rect.top_right()
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: border_edge_painting_info.rect.bottom_left();
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if (border_style == CSS::LineStyle::Dotted) {
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context.recording_painter().draw_line(p1.to_type<int>(), p2.to_type<int>(), color, width.value(), Gfx::LineStyle::Dotted);
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} else if (border_style == CSS::LineStyle::Dashed) {
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context.recording_painter().draw_line(p1.to_type<int>(), p2.to_type<int>(), color, width.value(), Gfx::LineStyle::Dashed);
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} else {
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// FIXME: Support the remaining line styles instead of rendering them as solid.
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context.recording_painter().fill_rect(Gfx::IntRect(border_edge_painting_info.rect.location(), border_edge_painting_info.rect.size()), color);
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}
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}
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}
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static HashMap<CellCoordinates, DevicePixelRect> snap_cells_to_device_coordinates(HashMap<CellCoordinates, PaintableBox const*> const& cell_coordinates_to_box, size_t row_count, size_t column_count, PaintContext const& context)
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{
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Vector<DevicePixels> y_line_start_coordinates;
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Vector<DevicePixels> y_line_end_coordinates;
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y_line_start_coordinates.resize(row_count + 1);
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y_line_end_coordinates.resize(row_count + 1);
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Vector<DevicePixels> x_line_start_coordinates;
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Vector<DevicePixels> x_line_end_coordinates;
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x_line_start_coordinates.resize(column_count + 1);
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x_line_end_coordinates.resize(column_count + 1);
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for (auto const& kv : cell_coordinates_to_box) {
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auto const& cell_box = kv.value;
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auto start_row_index = cell_box->table_cell_coordinates()->row_index;
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auto end_row_index = start_row_index + cell_box->table_cell_coordinates()->row_span;
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auto cell_rect = cell_box->absolute_border_box_rect();
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y_line_start_coordinates[start_row_index] = max(context.rounded_device_pixels(cell_rect.y()), y_line_start_coordinates[start_row_index]);
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y_line_end_coordinates[end_row_index] = max(context.rounded_device_pixels(cell_rect.y() + cell_rect.height()), y_line_end_coordinates[end_row_index]);
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auto start_column_index = cell_box->table_cell_coordinates()->column_index;
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auto end_column_index = start_column_index + cell_box->table_cell_coordinates()->column_span;
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x_line_start_coordinates[start_column_index] = max(context.rounded_device_pixels(cell_rect.x()), x_line_start_coordinates[start_column_index]);
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x_line_end_coordinates[end_column_index] = max(context.rounded_device_pixels(cell_rect.x() + cell_rect.width()), x_line_end_coordinates[end_column_index]);
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}
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HashMap<CellCoordinates, DevicePixelRect> cell_coordinates_to_device_rect;
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for (auto const& kv : cell_coordinates_to_box) {
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auto const& cell_box = kv.value;
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auto start_row_index = cell_box->table_cell_coordinates()->row_index;
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auto end_row_index = start_row_index + cell_box->table_cell_coordinates()->row_span;
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auto height = y_line_end_coordinates[end_row_index] - y_line_start_coordinates[start_row_index];
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auto start_column_index = cell_box->table_cell_coordinates()->column_index;
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auto end_column_index = start_column_index + cell_box->table_cell_coordinates()->column_span;
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auto width = x_line_end_coordinates[end_column_index] - x_line_start_coordinates[start_column_index];
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cell_coordinates_to_device_rect.set(kv.key, DevicePixelRect { x_line_start_coordinates[start_column_index], y_line_start_coordinates[start_row_index], width, height });
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}
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return cell_coordinates_to_device_rect;
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}
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static DeviceBorderDataWithElementKind device_border_data_from_css_border_data(Painting::PaintableBox::BorderDataWithElementKind const& border_data_with_element_kind, PaintContext const& context)
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{
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return DeviceBorderDataWithElementKind {
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.border_data = {
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.color = border_data_with_element_kind.border_data.color,
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.line_style = border_data_with_element_kind.border_data.line_style,
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.width = context.rounded_device_pixels(border_data_with_element_kind.border_data.width),
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},
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.element_kind = border_data_with_element_kind.element_kind,
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};
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}
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static void paint_separate_cell_borders(PaintableBox const& cell_box, HashMap<CellCoordinates, DevicePixelRect> const& cell_coordinates_to_device_rect, PaintContext& context)
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{
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auto borders_data = cell_box.override_borders_data().has_value() ? PaintableBox::remove_element_kind_from_borders_data(cell_box.override_borders_data().value()) : BordersData {
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.top = cell_box.box_model().border.top == 0 ? CSS::BorderData() : cell_box.computed_values().border_top(),
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.right = cell_box.box_model().border.right == 0 ? CSS::BorderData() : cell_box.computed_values().border_right(),
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.bottom = cell_box.box_model().border.bottom == 0 ? CSS::BorderData() : cell_box.computed_values().border_bottom(),
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.left = cell_box.box_model().border.left == 0 ? CSS::BorderData() : cell_box.computed_values().border_left(),
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};
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auto cell_rect = cell_coordinates_to_device_rect.get({ cell_box.table_cell_coordinates()->row_index, cell_box.table_cell_coordinates()->column_index }).value();
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paint_all_borders(context.recording_painter(), cell_rect, cell_box.normalized_border_radii_data().as_corners(context), borders_data.to_device_pixels(context));
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}
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void paint_table_borders(PaintContext& context, PaintableBox const& table_paintable)
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{
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// Partial implementation of painting according to the collapsing border model:
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// https://www.w3.org/TR/CSS22/tables.html#collapsing-borders
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Vector<PaintableBox const&> cell_boxes;
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collect_cell_boxes(cell_boxes, table_paintable);
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Vector<BorderEdgePaintingInfo> border_edge_painting_info_list;
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HashMap<CellCoordinates, PaintableBox const*> cell_coordinates_to_box;
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size_t row_count = 0;
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size_t column_count = 0;
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for (auto const& cell_box : cell_boxes) {
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cell_coordinates_to_box.set(CellCoordinates {
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.row_index = cell_box.table_cell_coordinates()->row_index,
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.column_index = cell_box.table_cell_coordinates()->column_index },
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&cell_box);
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row_count = max(row_count, cell_box.table_cell_coordinates()->row_index + cell_box.table_cell_coordinates()->row_span);
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column_count = max(column_count, cell_box.table_cell_coordinates()->column_index + cell_box.table_cell_coordinates()->column_span);
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}
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auto cell_coordinates_to_device_rect = snap_cells_to_device_coordinates(cell_coordinates_to_box, row_count, column_count, context);
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for (auto const& cell_box : cell_boxes) {
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if (cell_box.computed_values().border_collapse() == CSS::BorderCollapse::Separate) {
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paint_separate_cell_borders(cell_box, cell_coordinates_to_device_rect, context);
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continue;
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}
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auto css_borders_data = cell_box.override_borders_data().has_value() ? cell_box.override_borders_data().value() : PaintableBox::BordersDataWithElementKind {
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.top = { .border_data = cell_box.box_model().border.top == 0 ? CSS::BorderData() : cell_box.computed_values().border_top(), .element_kind = PaintableBox::ConflictingElementKind::Cell },
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.right = { .border_data = cell_box.box_model().border.right == 0 ? CSS::BorderData() : cell_box.computed_values().border_right(), .element_kind = PaintableBox::ConflictingElementKind::Cell },
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.bottom = { .border_data = cell_box.box_model().border.bottom == 0 ? CSS::BorderData() : cell_box.computed_values().border_bottom(), .element_kind = PaintableBox::ConflictingElementKind::Cell },
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.left = { .border_data = cell_box.box_model().border.left == 0 ? CSS::BorderData() : cell_box.computed_values().border_left(), .element_kind = PaintableBox::ConflictingElementKind::Cell },
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};
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DeviceBordersDataWithElementKind borders_data = {
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.top = device_border_data_from_css_border_data(css_borders_data.top, context),
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.right = device_border_data_from_css_border_data(css_borders_data.right, context),
|
|
.bottom = device_border_data_from_css_border_data(css_borders_data.bottom, context),
|
|
.left = device_border_data_from_css_border_data(css_borders_data.left, context),
|
|
};
|
|
auto cell_rect = cell_coordinates_to_device_rect.get({ cell_box.table_cell_coordinates()->row_index, cell_box.table_cell_coordinates()->column_index }).value();
|
|
CellCoordinates right_cell_coordinates {
|
|
.row_index = cell_box.table_cell_coordinates()->row_index,
|
|
.column_index = cell_box.table_cell_coordinates()->column_index + cell_box.table_cell_coordinates()->column_span
|
|
};
|
|
auto maybe_right_cell = cell_coordinates_to_device_rect.get(right_cell_coordinates);
|
|
CellCoordinates down_cell_coordinates {
|
|
.row_index = cell_box.table_cell_coordinates()->row_index + cell_box.table_cell_coordinates()->row_span,
|
|
.column_index = cell_box.table_cell_coordinates()->column_index
|
|
};
|
|
auto maybe_down_cell = cell_coordinates_to_device_rect.get(down_cell_coordinates);
|
|
if (maybe_right_cell.has_value())
|
|
border_edge_painting_info_list.append(make_right_cell_edge(maybe_right_cell.value(), cell_rect, borders_data, right_cell_coordinates));
|
|
if (maybe_down_cell.has_value())
|
|
border_edge_painting_info_list.append(make_down_cell_edge(maybe_down_cell.value(), cell_rect, borders_data, down_cell_coordinates));
|
|
if (cell_box.table_cell_coordinates()->row_index == 0)
|
|
border_edge_painting_info_list.append(make_first_row_top_cell_edge(cell_rect, borders_data,
|
|
{ .row_index = 0, .column_index = cell_box.table_cell_coordinates()->column_index }));
|
|
if (cell_box.table_cell_coordinates()->row_index + cell_box.table_cell_coordinates()->row_span == row_count)
|
|
border_edge_painting_info_list.append(make_last_row_bottom_cell_edge(cell_rect, borders_data,
|
|
{ .row_index = row_count - 1, .column_index = cell_box.table_cell_coordinates()->column_index }));
|
|
if (cell_box.table_cell_coordinates()->column_index == 0)
|
|
border_edge_painting_info_list.append(make_first_column_left_cell_edge(cell_rect, borders_data,
|
|
{ .row_index = cell_box.table_cell_coordinates()->row_index, .column_index = 0 }));
|
|
if (cell_box.table_cell_coordinates()->column_index + cell_box.table_cell_coordinates()->column_span == column_count)
|
|
border_edge_painting_info_list.append(make_last_column_right_cell_edge(cell_rect, borders_data,
|
|
{ .row_index = cell_box.table_cell_coordinates()->row_index, .column_index = column_count - 1 }));
|
|
}
|
|
|
|
paint_collected_edges(context, border_edge_painting_info_list);
|
|
|
|
for (auto const& cell_box : cell_boxes) {
|
|
auto const& border_radii_data = cell_box.normalized_border_radii_data();
|
|
auto top_left = border_radii_data.top_left.as_corner(context);
|
|
auto top_right = border_radii_data.top_right.as_corner(context);
|
|
auto bottom_right = border_radii_data.bottom_right.as_corner(context);
|
|
auto bottom_left = border_radii_data.bottom_left.as_corner(context);
|
|
if (!top_left && !top_right && !bottom_left && !bottom_right) {
|
|
continue;
|
|
} else {
|
|
auto borders_data = cell_box.override_borders_data().has_value() ? PaintableBox::remove_element_kind_from_borders_data(cell_box.override_borders_data().value()) : BordersData {
|
|
.top = cell_box.box_model().border.top == 0 ? CSS::BorderData() : cell_box.computed_values().border_top(),
|
|
.right = cell_box.box_model().border.right == 0 ? CSS::BorderData() : cell_box.computed_values().border_right(),
|
|
.bottom = cell_box.box_model().border.bottom == 0 ? CSS::BorderData() : cell_box.computed_values().border_bottom(),
|
|
.left = cell_box.box_model().border.left == 0 ? CSS::BorderData() : cell_box.computed_values().border_left(),
|
|
};
|
|
paint_all_borders(context.recording_painter(), context.rounded_device_rect(cell_box.absolute_border_box_rect()), cell_box.normalized_border_radii_data().as_corners(context), borders_data.to_device_pixels(context));
|
|
}
|
|
}
|
|
}
|
|
}
|