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layout: Make overflow calculation take relative percentages into

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account.

This necessitated changing overflow to be calculated by the parent flow
if relatively positioned children are present. That is because the
overflow regions cannot be calculated without knowing relative offsets,
which themselves cannot be calculated without knowing the parent size
(because of percentages). To accomplish this without sacrificing
parallelism in the non-relative case, this patch splits overflow into
"early" and "late" computation. Late overflow computation cannot be
parallelized across children, while early overflow computation can.

Makes the "Apple Music" text show up over the full-bleed promotional
background on apple.com.
This commit is contained in:
Patrick Walton 2015-08-21 13:49:40 -07:00
parent 108251bece
commit b66f17a445
12 changed files with 203 additions and 75 deletions
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24
components/layout/display_list_builder.rs
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@ -1152,9 +1152,9 @@ impl FragmentDisplayListBuilding for Fragment {
StackingContextCreationMode::Normal |
StackingContextCreationMode::OuterScrollWrapper => {
self.stacking_relative_border_box(&base_flow.stacking_relative_position,
&base_flow.absolute_position_info
&base_flow.early_absolute_position_info
.relative_containing_block_size,
base_flow.absolute_position_info
base_flow.early_absolute_position_info
.relative_containing_block_mode,
CoordinateSystem::Parent)
}
@ -1533,8 +1533,12 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
.build_display_list(display_list,
layout_context,
&self.base.stacking_relative_position,
&self.base.absolute_position_info.relative_containing_block_size,
self.base.absolute_position_info.relative_containing_block_mode,
&self.base
.early_absolute_position_info
.relative_containing_block_size,
self.base
.early_absolute_position_info
.relative_containing_block_mode,
border_painting_mode,
background_border_level,
&clip,
@ -1616,8 +1620,8 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
&mut outer_display_list_for_overflow_scroll,
layout_context,
&self.base.stacking_relative_position,
&self.base.absolute_position_info.relative_containing_block_size,
self.base.absolute_position_info.relative_containing_block_mode,
&self.base.early_absolute_position_info.relative_containing_block_size,
self.base.early_absolute_position_info.relative_containing_block_mode,
border_painting_mode,
BackgroundAndBorderLevel::RootOfStackingContext,
&clip,
@ -1775,10 +1779,10 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
layout_context,
&self.base.stacking_relative_position,
&self.base
.absolute_position_info
.early_absolute_position_info
.relative_containing_block_size,
self.base
.absolute_position_info
.early_absolute_position_info
.relative_containing_block_mode,
BorderPaintingMode::Separate,
BackgroundAndBorderLevel::Content,
@ -1857,11 +1861,11 @@ impl ListItemFlowDisplayListBuilding for ListItemFlow {
&self.block_flow.base.stacking_relative_position,
&self.block_flow
.base
.absolute_position_info
.early_absolute_position_info
.relative_containing_block_size,
self.block_flow
.base
.absolute_position_info
.early_absolute_position_info
.relative_containing_block_mode,
BorderPaintingMode::Separate,
BackgroundAndBorderLevel::Content,