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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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13
components/layout/text.rs
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@ -160,16 +160,17 @@ impl TextRunScanner {
}
let text_size = old_fragment.border_box.size;
let &NewLinePositions(ref mut new_line_positions) =
new_line_positions.get_mut(logical_offset);
let new_text_fragment_info =
ScannedTextFragmentInfo::new(run.clone(), range, text_size);
box ScannedTextFragmentInfo::new(run.clone(),
range,
mem::replace(new_line_positions, Vec::new()),
text_size);
let new_metrics = new_text_fragment_info.run.metrics_for_range(&range);
let bounding_box_size = bounding_box_for_run_metrics(&new_metrics,
old_fragment.style.writing_mode);
let mut new_fragment = old_fragment.transform(bounding_box_size,
new_text_fragment_info);
let &NewLinePositions(ref mut new_line_positions) =
new_line_positions.get_mut(logical_offset);
new_fragment.new_line_pos = mem::replace(new_line_positions, Vec::new());
let new_fragment = old_fragment.transform(bounding_box_size, new_text_fragment_info);
out_fragments.push(new_fragment)
}