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Minor improvements

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This commit is contained in:
Joe Wilm 2018-02-11 10:07:33 -08:00
parent b7578a5236
commit 620f83842c
2 changed files with 14 additions and 9 deletions
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18
src/grid/mod.rs
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@ -179,26 +179,26 @@ impl<T: Copy + Clone> Grid<T> {
self.swap_lines(line, line - positions); self.swap_lines(line, line - positions);
} }
for i in IndexRange(Line(0)..positions) { for line in IndexRange(region.start .. (region.start + positions)) {
self.raw[*(region.start - i - 1)].reset(&self.template_row); self.raw[*line].reset(&self.template_row);
} }
} }
} }
/// scroll_up moves lines at the bottom towards the top
///
/// This is the performance-sensitive part of scrolling.
#[inline] #[inline]
pub fn scroll_up(&mut self, region: &Range<index::Line>, positions: index::Line) { pub fn scroll_up(&mut self, region: &Range<index::Line>, positions: index::Line) {
if region.start == Line(0) { if region.start == Line(0) {
// Rotate the entire line buffer. If there's a scrolling region // Rotate the entire line buffer. If there's a scrolling region
// active, the bottom lines are restored in the next step. // active, the bottom lines are restored in the next step.
self.raw.rotate(*positions as isize); self.raw.rotate_up(*positions);
// Now, restore any lines outside the scroll region // Now, restore any lines outside the scroll region
let mut i = 0; for idx in (*region.end .. *self.num_lines()).rev() {
for _ in IndexRange(region.end .. self.num_lines()) {
let idx = *self.num_lines() - i - 1;
// First do the swap // First do the swap
self.raw.swap(idx, idx - *positions); self.raw.swap(idx, idx - *positions);
i += 1;
} }
// Finally, reset recycled lines // Finally, reset recycled lines
@ -214,8 +214,8 @@ impl<T: Copy + Clone> Grid<T> {
} }
// Clear reused lines // Clear reused lines
for i in IndexRange(Line(0)..positions) { for line in IndexRange((region.end - positions) .. region.end) {
self.raw[*(region.start - i - 1)].reset(&self.template_row); self.raw[*line].reset(&self.template_row);
} }
} }
} }

5
src/grid/storage.rs
View file

@ -68,6 +68,11 @@ impl<T> Storage<T> {
assert!(count.abs() as usize <= len); assert!(count.abs() as usize <= len);
self.zero += (count + len as isize) as usize % len; self.zero += (count + len as isize) as usize % len;
} }
// Fast path
pub fn rotate_up(&mut self, count: usize) {
self.zero = (self.zero + count) % self.len();
}
} }
impl<T> Index<usize> for Storage<T> { impl<T> Index<usize> for Storage<T> {