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layout: Convert the FragmentTree to physical geometry (#33030)
This converts all geometry in the FragmentTree into physical geometry, doing conversions ahead of time instead of when traversing the fragment tree. This is necessary to properly implement BiDi in Servo as we need to know what side borders are on in mixed RTL and LTR contexts. In addition, fragments are laid out in a particular context and only that context knows its writing mode. There were issues where were using one writing mode to lay out and another to convert to phyisical coordinates. This isn't an issue now since we only use the default writing mode, but starts to be an issue with BiDi text. Closes #25564. Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson
GitHub
parent
65f90ff1fd
commit
d941d2fd67
17 changed files with 502 additions and 432 deletions
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@ -29,7 +29,9 @@ use crate::formatting_contexts::{
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use crate::fragment_tree::{
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BaseFragmentInfo, BoxFragment, CollapsedBlockMargins, CollapsedMargin, Fragment, FragmentFlags,
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};
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use crate::geom::{AuOrAuto, LogicalRect, LogicalSides, LogicalVec2};
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use crate::geom::{
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AuOrAuto, LogicalRect, LogicalSides, LogicalVec2, PhysicalRect, PhysicalSides, ToLogical,
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};
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use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
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use crate::replaced::ReplacedContent;
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use crate::sizing::{self, ContentSizes};
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@ -225,9 +227,10 @@ impl OutsideMarker {
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sequential_layout_state: Option<&mut SequentialLayoutState>,
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collapsible_with_parent_start_margin: Option<CollapsibleWithParentStartMargin>,
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) -> Fragment {
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let containing_block_writing_mode = containing_block.style.writing_mode;
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let content_sizes = self
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.block_container
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.inline_content_sizes(layout_context, containing_block.style.writing_mode);
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.inline_content_sizes(layout_context, containing_block_writing_mode);
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let containing_block_for_children = ContainingBlock {
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inline_size: content_sizes.max_content,
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block_size: AuOrAuto::auto(),
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@ -241,22 +244,29 @@ impl OutsideMarker {
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sequential_layout_state,
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collapsible_with_parent_start_margin.unwrap_or(CollapsibleWithParentStartMargin(false)),
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);
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let max_inline_size = flow_layout.fragments.iter().fold(
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Length::zero(),
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|current_max, fragment| match fragment {
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Fragment::Text(text) => current_max.max(text.rect.max_inline_position().into()),
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Fragment::Image(image) => current_max.max(image.rect.max_inline_position().into()),
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Fragment::Positioning(positioning) => {
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current_max.max(positioning.rect.max_inline_position().into())
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},
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Fragment::Box(_) |
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Fragment::Float(_) |
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Fragment::AbsoluteOrFixedPositioned(_) |
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Fragment::IFrame(_) => {
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unreachable!("Found unexpected fragment type in outside list marker!");
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},
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},
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);
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let max_inline_size =
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flow_layout
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.fragments
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.iter()
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.fold(Au::zero(), |current_max, fragment| {
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current_max.max(
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match fragment {
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Fragment::Text(text) => text.rect,
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Fragment::Image(image) => image.rect,
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Fragment::Positioning(positioning) => positioning.rect,
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Fragment::Box(_) |
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Fragment::Float(_) |
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Fragment::AbsoluteOrFixedPositioned(_) |
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Fragment::IFrame(_) => {
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unreachable!(
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"Found unexpected fragment type in outside list marker!"
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);
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},
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}
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.to_logical(containing_block_writing_mode)
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.max_inline_position(),
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)
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});
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// Position the marker beyond the inline start of the border box list item. This needs to
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// take into account the border and padding of the item.
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@ -269,13 +279,12 @@ impl OutsideMarker {
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start_corner: LogicalVec2 {
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inline: -max_inline_size -
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(pbm_of_list_item.border.inline_start +
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pbm_of_list_item.padding.inline_start)
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.into(),
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pbm_of_list_item.padding.inline_start),
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block: Zero::zero(),
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},
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size: LogicalVec2 {
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inline: max_inline_size,
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block: flow_layout.content_block_size,
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block: flow_layout.content_block_size.into(),
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},
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};
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@ -286,10 +295,10 @@ impl OutsideMarker {
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base_fragment_info,
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self.marker_style.clone(),
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flow_layout.fragments,
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content_rect.into(),
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LogicalSides::zero(),
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LogicalSides::zero(),
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LogicalSides::zero(),
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content_rect.to_physical(containing_block_writing_mode),
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PhysicalSides::zero(),
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PhysicalSides::zero(),
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PhysicalSides::zero(),
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None,
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CollapsedBlockMargins::zero(),
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))
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@ -567,6 +576,7 @@ fn layout_block_level_children_in_parallel(
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placement_state.place_fragment_and_update_baseline(&mut fragment, None);
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child_positioning_context.adjust_static_position_of_hoisted_fragments(
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&fragment,
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containing_block.style.writing_mode,
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PositioningContextLength::zero(),
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);
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positioning_context.append(child_positioning_context);
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@ -604,6 +614,7 @@ fn layout_block_level_children_sequentially(
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.place_fragment_and_update_baseline(&mut fragment, Some(sequential_layout_state));
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positioning_context.adjust_static_position_of_hoisted_fragments(
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&fragment,
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containing_block.style.writing_mode,
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positioning_context_length_before_layout,
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);
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@ -906,14 +917,15 @@ fn layout_in_flow_non_replaced_block_level_same_formatting_context(
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},
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};
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let containing_block_writing_mode = containing_block.style.writing_mode;
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BoxFragment::new(
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base_fragment_info,
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style.clone(),
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flow_layout.fragments,
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content_rect,
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pbm.padding,
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pbm.border,
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margin,
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content_rect.to_physical(containing_block_writing_mode),
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pbm.padding.to_physical(containing_block_writing_mode),
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pbm.border.to_physical(containing_block_writing_mode),
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margin.to_physical(containing_block_writing_mode),
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clearance,
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block_margins_collapsed_with_children,
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)
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@ -991,15 +1003,15 @@ impl NonReplacedFormattingContext {
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};
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let block_margins_collapsed_with_children = CollapsedBlockMargins::from_margin(&margin);
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let containing_block_writing_mode = containing_block.style.writing_mode;
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BoxFragment::new(
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self.base_fragment_info,
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self.style.clone(),
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layout.fragments,
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content_rect,
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pbm.padding,
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pbm.border,
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margin,
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content_rect.to_physical(containing_block_writing_mode),
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pbm.padding.to_physical(containing_block_writing_mode),
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pbm.border.to_physical(containing_block_writing_mode),
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margin.to_physical(containing_block_writing_mode),
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None, /* clearance */
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block_margins_collapsed_with_children,
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)
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@ -1242,14 +1254,15 @@ impl NonReplacedFormattingContext {
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};
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let block_margins_collapsed_with_children = CollapsedBlockMargins::from_margin(&margin);
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let containing_block_writing_mode = containing_block.style.writing_mode;
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BoxFragment::new(
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self.base_fragment_info,
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self.style.clone(),
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layout.fragments,
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content_rect,
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pbm.padding,
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pbm.border,
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margin,
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content_rect.to_physical(containing_block_writing_mode),
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pbm.padding.to_physical(containing_block_writing_mode),
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pbm.border.to_physical(containing_block_writing_mode),
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margin.to_physical(containing_block_writing_mode),
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clearance,
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block_margins_collapsed_with_children,
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)
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@ -1274,7 +1287,10 @@ fn layout_in_flow_replaced_block_level(
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let margin_inline_end;
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let effective_margin_inline_start;
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let (margin_block_start, margin_block_end) = solve_block_margins_for_in_flow_block_level(&pbm);
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let fragments = replaced.make_fragments(style, content_size);
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let containing_block_writing_mode = containing_block.style.writing_mode;
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let physical_content_size = content_size.to_physical_size(containing_block_writing_mode);
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let fragments = replaced.make_fragments(style, physical_content_size);
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let clearance;
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if let Some(ref mut sequential_layout_state) = sequential_layout_state {
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@ -1341,10 +1357,10 @@ fn layout_in_flow_replaced_block_level(
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inline: pbm.padding.inline_start + pbm.border.inline_start + effective_margin_inline_start,
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};
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let content_rect = LogicalRect {
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start_corner,
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size: content_size,
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};
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let content_rect = PhysicalRect::new(
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start_corner.to_physical_point(containing_block_writing_mode),
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physical_content_size,
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);
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let block_margins_collapsed_with_children = CollapsedBlockMargins::from_margin(&margin);
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BoxFragment::new(
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@ -1352,9 +1368,9 @@ fn layout_in_flow_replaced_block_level(
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style.clone(),
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fragments,
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content_rect,
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pbm.padding,
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pbm.border,
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margin,
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pbm.padding.to_physical(containing_block_writing_mode),
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pbm.border.to_physical(containing_block_writing_mode),
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margin.to_physical(containing_block_writing_mode),
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clearance,
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block_margins_collapsed_with_children,
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)
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@ -1618,6 +1634,9 @@ struct PlacementState {
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/// least as tall as the marker size -- even though the marker doesn't advance the block
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/// position of the placement.
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marker_block_size: Option<Au>,
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/// The [`WritingMode`] of the containing fragment where these fragments are being laid out.
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writing_mode: WritingMode,
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}
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impl PlacementState {
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@ -1637,6 +1656,7 @@ impl PlacementState {
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inflow_baselines: Baselines::default(),
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is_inline_block_context,
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marker_block_size: None,
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writing_mode: containing_block_style.writing_mode,
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}
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}
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@ -1662,11 +1682,16 @@ impl PlacementState {
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return;
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}
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let box_block_offset = box_fragment.content_rect.start_corner.block;
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if let (None, Some(first)) = (self.inflow_baselines.first, box_fragment.baselines.first) {
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let box_block_offset = box_fragment
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.content_rect
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.origin
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.to_logical(self.writing_mode)
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.block;
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let box_fragment_baselines = box_fragment.baselines(self.writing_mode);
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if let (None, Some(first)) = (self.inflow_baselines.first, box_fragment_baselines.first) {
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self.inflow_baselines.first = Some(first + box_block_offset);
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}
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if let Some(last) = box_fragment.baselines.last {
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if let Some(last) = box_fragment_baselines.last {
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self.inflow_baselines.last = Some(last + box_block_offset);
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}
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}
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@ -1694,14 +1719,22 @@ impl PlacementState {
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.contains(FragmentFlags::IS_OUTSIDE_LIST_ITEM_MARKER);
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if is_outside_marker {
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assert!(self.marker_block_size.is_none());
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self.marker_block_size = Some(fragment.content_rect.size.block);
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self.marker_block_size = Some(
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fragment
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.content_rect
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.size
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.to_logical(self.writing_mode)
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.block,
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);
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return;
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}
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let fragment_block_margins = &fragment.block_margins_collapsed_with_children;
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let mut fragment_block_size = fragment.padding.block_sum() +
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fragment.border.block_sum() +
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fragment.content_rect.size.block;
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let mut fragment_block_size = fragment
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.border_rect()
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.to_logical(self.writing_mode)
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.size
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.block;
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// We use `last_in_flow_margin_collapses_with_parent_end_margin` to implement
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// this quote from https://drafts.csswg.org/css2/#collapsing-margins
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@ -1737,8 +1770,12 @@ impl PlacementState {
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self.current_margin
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.adjoin_assign(&fragment_block_margins.start);
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}
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fragment.content_rect.start_corner.block +=
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self.current_margin.solve() + self.current_block_direction_position;
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fragment.content_rect.origin += LogicalVec2 {
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inline: Au::zero(),
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block: self.current_margin.solve() + self.current_block_direction_position,
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}
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.to_physical_size(self.writing_mode);
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if fragment_block_margins.collapsed_through {
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// `fragment_block_size` is typically zero when collapsing through,
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@ -1766,6 +1803,7 @@ impl PlacementState {
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self.current_block_direction_position + self.current_margin.solve();
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sequential_layout_state.place_float_fragment(
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box_fragment,
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self.writing_mode,
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self.start_margin,
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block_offset_from_containing_block_top,
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);
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