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layout: Rewrite text and inline fragment handling during flow

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construction to avoid cloning and moving flows so much.

Besides amounting to a 5%-10% win on a page with a lot of text, this
simplifies and refactors the text layout code.
This commit is contained in:
Patrick Walton 2014-10-17 14:45:10 -07:00
parent d8cb901f6a
commit bb6f557276
11 changed files with 341 additions and 322 deletions
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52
components/layout/inline.rs
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@ -11,7 +11,6 @@ use flow::{BaseFlow, FlowClass, Flow, InlineFlowClass, MutableFlowUtils};
use flow;
use fragment::{Fragment, InlineAbsoluteHypotheticalFragment, InlineBlockFragment};
use fragment::{ScannedTextFragment, ScannedTextFragmentInfo, SplitInfo};
use incremental::RestyleDamage;
use layout_debug;
use model::IntrinsicISizesContribution;
use text;
@ -620,57 +619,6 @@ impl InlineFragments {
self.fragments.get_mut(index)
}
/// Strips ignorable whitespace from the start of a list of fragments.
///
/// Returns some damage that must be added to the `InlineFlow`.
pub fn strip_ignorable_whitespace_from_start(&mut self) -> RestyleDamage {
if self.is_empty() { return RestyleDamage::empty() } // Fast path
// FIXME (rust#16151): This can be reverted back to using skip_while once
// the upstream bug is fixed.
let mut fragments = mem::replace(&mut self.fragments, vec![]).into_iter();
let mut new_fragments = Vec::new();
let mut skipping = true;
let mut damage = RestyleDamage::empty();
for fragment in fragments {
if skipping && fragment.is_ignorable_whitespace() {
damage = RestyleDamage::all();
debug!("stripping ignorable whitespace from start");
continue
}
skipping = false;
new_fragments.push(fragment);
}
self.fragments = new_fragments;
damage
}
/// Strips ignorable whitespace from the end of a list of fragments.
///
/// Returns some damage that must be added to the `InlineFlow`.
pub fn strip_ignorable_whitespace_from_end(&mut self) -> RestyleDamage {
if self.is_empty() {
return RestyleDamage::empty();
}
let mut damage = RestyleDamage::empty();
let mut new_fragments = self.fragments.clone();
while new_fragments.len() > 0 &&
new_fragments.as_slice().last().as_ref().unwrap().is_ignorable_whitespace() {
debug!("stripping ignorable whitespace from end");
damage = RestyleDamage::all();
drop(new_fragments.pop());
}
self.fragments = new_fragments;
damage
}
/// This function merges previously-line-broken fragments back into their
/// original, pre-line-breaking form.
pub fn merge_broken_lines(&mut self) {