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Fast path for gutter-less grid

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This commit is contained in:
Laurenz 2023-02-12 13:04:46 +01:00
parent 01a62a690b
commit fea238921f
1 changed files with 29 additions and 14 deletions
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43
library/src/layout/grid.rs
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@ -220,7 +220,9 @@ struct GridLayouter<'a, 'v> {
/// The grid cells.
cells: &'a [Content],
/// Whether this is an RTL grid.
rtl: bool,
is_rtl: bool,
/// Whether this grid has gutters.
has_gutter: bool,
/// The column tracks including gutter tracks.
cols: Vec<TrackSizing>,
/// The row tracks including gutter tracks.
@ -280,6 +282,7 @@ impl<'a, 'v> GridLayouter<'a, 'v> {
given.max(needed)
};
let has_gutter = gutter.any(|tracks| !tracks.is_empty());
let auto = TrackSizing::Auto;
let zero = TrackSizing::Relative(Rel::zero());
let get_or = |tracks: &[_], idx, default| {
@ -289,22 +292,28 @@ impl<'a, 'v> GridLayouter<'a, 'v> {
// Collect content and gutter columns.
for x in 0..c {
cols.push(get_or(tracks.x, x, auto));
cols.push(get_or(gutter.x, x, zero));
if has_gutter {
cols.push(get_or(gutter.x, x, zero));
}
}
// Collect content and gutter rows.
for y in 0..r {
rows.push(get_or(tracks.y, y, auto));
rows.push(get_or(gutter.y, y, zero));
if has_gutter {
rows.push(get_or(gutter.y, y, zero));
}
}
// Remove superfluous gutter tracks.
cols.pop();
rows.pop();
if has_gutter {
cols.pop();
rows.pop();
}
// Reverse for RTL.
let rtl = styles.get(TextNode::DIR) == Dir::RTL;
if rtl {
let is_rtl = styles.get(TextNode::DIR) == Dir::RTL;
if is_rtl {
cols.reverse();
}
@ -320,7 +329,8 @@ impl<'a, 'v> GridLayouter<'a, 'v> {
Self {
vt,
cells,
rtl,
is_rtl,
has_gutter,
cols,
rows,
regions,
@ -695,16 +705,21 @@ impl<'a, 'v> GridLayouter<'a, 'v> {
assert!(y < self.rows.len());
// Columns are reorded, but the cell slice is not.
if self.rtl {
if self.is_rtl {
x = self.cols.len() - 1 - x;
}
// Even columns and rows are children, odd ones are gutter.
if x % 2 == 0 && y % 2 == 0 {
let c = 1 + self.cols.len() / 2;
self.cells.get((y / 2) * c + x / 2)
if self.has_gutter {
// Even columns and rows are children, odd ones are gutter.
if x % 2 == 0 && y % 2 == 0 {
let c = 1 + self.cols.len() / 2;
self.cells.get((y / 2) * c + x / 2)
} else {
None
}
} else {
None
let c = self.cols.len();
self.cells.get(y * c + x)
}
}
}