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Avoid unnecessary calculations of the entire run metrics

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This commit is contained in:
Brendan Zabarauskas 2014-05-16 13:41:00 -07:00
parent 1f7963e86b
commit 3cf82c7c92
2 changed files with 20 additions and 14 deletions
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11
src/components/gfx/text/text_run.rs
View file

@ -183,6 +183,14 @@ impl<'a> TextRun {
true
}
pub fn ascent(&self) -> Au {
self.font_metrics.ascent
}
pub fn descent(&self) -> Au {
self.font_metrics.descent
}
pub fn advance_for_range(&self, range: &Range<CharIndex>) -> Au {
// TODO(Issue #199): alter advance direction for RTL
// TODO(Issue #98): using inter-char and inter-word spacing settings when measuring text
@ -209,8 +217,7 @@ impl<'a> TextRun {
debug!("iterating outer range {:?}", range);
for (_, offset, slice_range) in self.iter_slices_for_range(range) {
debug!("iterated on {:?}[{:?}]", offset, slice_range);
let metrics = self.metrics_for_range(&slice_range);
max_piece_width = Au::max(max_piece_width, metrics.advance_width);
max_piece_width = Au::max(max_piece_width, self.advance_for_range(&slice_range));
}
max_piece_width
}

23
src/components/main/layout/box_.rs
View file

@ -791,7 +791,7 @@ impl Box {
display_list.push(BorderDisplayItemClass(border_display_item));
// Draw a rectangle representing the baselines.
let ascent = text_box.run.metrics_for_range(&text_box.range).ascent;
let ascent = text_box.run.ascent();
let baseline = Rect(absolute_box_bounds.origin + Point2D(Au(0), ascent),
Size2D(absolute_box_bounds.size.width, Au(0)));
@ -1216,21 +1216,20 @@ impl Box {
let left_box = if left_range.length() > CharIndex(0) {
let new_text_box_info = ScannedTextBoxInfo::new(text_box_info.run.clone(), left_range);
let mut new_metrics = new_text_box_info.run.metrics_for_range(&left_range);
new_metrics.bounding_box.size.height = self.border_box.size.height;
Some(self.transform(new_metrics.bounding_box.size,
ScannedTextBox(new_text_box_info)))
let width = new_text_box_info.run.advance_for_range(&left_range);
let height = self.border_box.size.height;
let size = Size2D(width, height);
Some(self.transform(size, ScannedTextBox(new_text_box_info)))
} else {
None
};
let right_box = right_range.map_or(None, |range: Range<CharIndex>| {
let new_text_box_info = ScannedTextBoxInfo::new(text_box_info.run.clone(),
range);
let mut new_metrics = new_text_box_info.run.metrics_for_range(&range);
new_metrics.bounding_box.size.height = self.border_box.size.height;
Some(self.transform(new_metrics.bounding_box.size,
ScannedTextBox(new_text_box_info)))
let right_box = right_range.map_or(None, |right_range: Range<CharIndex>| {
let new_text_box_info = ScannedTextBoxInfo::new(text_box_info.run.clone(), right_range);
let width = new_text_box_info.run.advance_for_range(&right_range);
let height = self.border_box.size.height;
let size = Size2D(width, height);
Some(self.transform(size, ScannedTextBox(new_text_box_info)))
});
if pieces_processed_count == 1 || left_box.is_none() {