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Compute border spacing info beforehand

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This commit is contained in:
Manish Goregaokar 2018-02-26 22:20:26 -08:00
parent 7cd3daa76f
commit 108ecc1f4d
2 changed files with 59 additions and 19 deletions
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68
components/layout/table.rs
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@ -781,17 +781,54 @@ impl TableLikeFlow for BlockFlow {
debug_assert!(self.fragment.style.get_inheritedtable().border_collapse ==
border_collapse::T::Separate || block_direction_spacing == Au(0));
if self.base.restyle_damage.contains(ServoRestyleDamage::REFLOW) {
let mut sizes = vec![];
let mut incoming_rowspan_data = vec![];
for kid in self.base.child_iter_mut() {
if kid.is_table_row() {
sizes.push(kid.as_mut_table_row()
.compute_block_size_table_row_base(layout_context, &mut incoming_rowspan_data))
fn border_spacing_for_row(fragment: &Fragment, row: &TableRowFlow,
block_direction_spacing: Au) -> Au {
match fragment.style.get_inheritedtable().border_collapse {
border_collapse::T::Separate => block_direction_spacing,
border_collapse::T::Collapse => {
row.collapsed_border_spacing.block_start
}
}
}
if self.base.restyle_damage.contains(ServoRestyleDamage::REFLOW) {
// (size, cumulative_border_spacing)
let mut sizes = vec![(Au(0), Au(0))];
// The amount of border spacing up to and including this row,
// but not including the spacing beneath it
let mut cumulative_border = Au(0);
let mut incoming_rowspan_data = vec![];
// First pass: Compute block-direction border spacings
// XXXManishearth this can be done in tandem with the second pass,
// provided we never hit any rowspan cases
for kid in self.base.child_iter_mut()
.filter(|k| k.is_table_row())
.skip(1) {
cumulative_border +=
border_spacing_for_row(&self.fragment, kid.as_table_row(),
block_direction_spacing);
// we haven't calculated sizes yet
sizes.push((Au(0), cumulative_border));
}
// Second pass: Compute row block sizes
// [expensive: iterates over cells]
let mut i = 0;
for kid in self.base.child_iter_mut() {
if kid.is_table_row() {
let size = kid.as_mut_table_row()
.compute_block_size_table_row_base(layout_context,
&mut incoming_rowspan_data,
&sizes,
i);
sizes[i].0 = size;
i += 1;
}
}
// Third pass: Assign block sizes to rows and cells
// [expensive: iterates over cells]
let mut effects_rows = 0;
let mut i = 0;
for kid in self.base.child_iter_mut() {
@ -811,11 +848,15 @@ impl TableLikeFlow for BlockFlow {
i += 1;
}
}
// Our current border-box position.
let block_start_border_padding = self.fragment.border_padding.block_start;
let mut current_block_offset = block_start_border_padding;
let mut has_rows = false;
// Fourth pass: Compute block positions
// XXXManishearth this can be merged with the third pass
// At this point, `current_block_offset` is at the content edge of our box. Now iterate
// over children.
for kid in self.base.child_iter_mut() {
@ -824,12 +865,8 @@ impl TableLikeFlow for BlockFlow {
has_rows = true;
let child_table_row = kid.as_table_row();
current_block_offset = current_block_offset +
match self.fragment.style.get_inheritedtable().border_collapse {
border_collapse::T::Separate => block_direction_spacing,
border_collapse::T::Collapse => {
child_table_row.collapsed_border_spacing.block_start
}
}
border_spacing_for_row(&self.fragment, child_table_row,
block_direction_spacing)
}
// At this point, `current_block_offset` is at the border edge of the child.
@ -874,6 +911,7 @@ impl TableLikeFlow for BlockFlow {
self.fragment.border_box.start.b = Au(0);
self.base.position.size.block = current_block_offset;
// Fifth pass: Assign absolute position info
// Write in the size of the relative containing block for children. (This information
// is also needed to handle RTL.)
for kid in self.base.child_iter_mut() {