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layout: Shrink fragments down from 448 bytes down to 128 bytes.

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16% performance improvement in layout (!)
This commit is contained in:
Patrick Walton 2014-10-21 23:08:02 -07:00
parent 2df236376a
commit de5e2fd5e2
8 changed files with 128 additions and 88 deletions
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34
components/layout/inline.rs
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@ -391,7 +391,11 @@ impl LineBreaker {
}
fn try_append_to_line_by_new_line(&mut self, in_fragment: Fragment) -> bool {
if in_fragment.new_line_pos.len() == 0 {
let no_newline_positions = match in_fragment.newline_positions() {
None => true,
Some(ref positions) => positions.is_empty(),
};
if no_newline_positions {
debug!("LineBreaker: Did not find a new-line character, so pushing the fragment to \
the line without splitting.");
self.push_fragment_to_line(in_fragment);
@ -406,13 +410,14 @@ impl LineBreaker {
let writing_mode = self.floats.writing_mode;
let split_fragment = |split: SplitInfo| {
let info =
ScannedTextFragmentInfo::new(
run.clone(),
split.range,
in_fragment.border_box.size);
let size = LogicalSize::new(
writing_mode, split.inline_size, in_fragment.border_box.size.block);
let info = box ScannedTextFragmentInfo::new(run.clone(),
split.range,
(*in_fragment.newline_positions()
.unwrap()).clone(),
in_fragment.border_box.size);
let size = LogicalSize::new(writing_mode,
split.inline_size,
in_fragment.border_box.size.block);
in_fragment.transform(size, info)
};
@ -420,14 +425,14 @@ impl LineBreaker {
to the line.");
let mut inline_start = split_fragment(inline_start);
inline_start.save_new_line_pos();
inline_start.new_line_pos = vec![];
*inline_start.newline_positions_mut().unwrap() = vec![];
self.push_fragment_to_line(inline_start);
for inline_end in inline_end.into_iter() {
debug!("LineBreaker: Deferring the fragment to the inline_end of the new-line \
character to the line.");
let mut inline_end = split_fragment(inline_end);
inline_end.new_line_pos.remove(0);
inline_end.newline_positions_mut().unwrap().remove(0);
self.work_list.push_front(inline_end);
}
@ -497,11 +502,10 @@ impl LineBreaker {
line_is_empty);
match split.map(|(inline_start, inline_end, run)| {
let split_fragment = |split: SplitInfo| {
let info =
ScannedTextFragmentInfo::new(
run.clone(),
split.range,
in_fragment.border_box.size);
let info = box ScannedTextFragmentInfo::new(run.clone(),
split.range,
Vec::new(),
in_fragment.border_box.size);
let size = LogicalSize::new(self.floats.writing_mode,
split.inline_size,
in_fragment.border_box.size.block);