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