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PageList: refactor clone to avoid excess work

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Also avoids leaving content in out-of-bounds rows, since it doesn't copy
the content to them in the first place. Over all, just a lot cleaner.
This commit is contained in:
Qwerasd
2024-08-22 20:59:52 -04:00
parent 38bb9b40a6
commit 5714c2feed
1 changed files with 8 additions and 76 deletions
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82
src/terminal/PageList.zig
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@ -416,93 +416,25 @@ pub fn clone(
chunk.page.data.capacity,
&page_size,
);
assert(page.data.capacity.rows >= chunk.page.data.capacity.rows);
assert(page.data.capacity.rows >= chunk.end - chunk.start);
defer page.data.assertIntegrity();
page.data.size.rows = chunk.page.data.size.rows;
page.data.size.rows = chunk.end - chunk.start;
try page.data.cloneFrom(
&chunk.page.data,
0,
chunk.page.data.size.rows,
chunk.start,
chunk.end,
);
page_list.append(page);
// If this is a full page then we're done.
if (chunk.fullPage()) {
total_rows += page.data.size.rows;
// Updating tracked pins is easy, we just change the page
// pointer but all offsets remain the same.
if (opts.tracked_pins) |remap| {
const pin_keys = self.tracked_pins.keys();
for (pin_keys) |p| {
if (p.page != chunk.page) continue;
const new_p = try pool.pins.create();
new_p.* = p.*;
new_p.page = page;
try remap.putNoClobber(p, new_p);
try tracked_pins.putNoClobber(pool.alloc, new_p, {});
}
}
continue;
}
// If this is just a shortened chunk off the end we can just
// shorten the size. We don't worry about clearing memory here because
// as the page grows the memory will be reclaimable because the data
// is still valid.
if (chunk.start == 0) {
page.data.size.rows = @intCast(chunk.end);
total_rows += chunk.end;
// Updating tracked pins for the pins that are in the shortened chunk.
if (opts.tracked_pins) |remap| {
const pin_keys = self.tracked_pins.keys();
for (pin_keys) |p| {
if (p.page != chunk.page or
p.y >= chunk.end) continue;
const new_p = try pool.pins.create();
new_p.* = p.*;
new_p.page = page;
try remap.putNoClobber(p, new_p);
try tracked_pins.putNoClobber(pool.alloc, new_p, {});
}
}
continue;
}
// We want to maintain the dirty bits from the original page so
// instead of setting a range we grab the dirty bit and then
// set it on the new page in the new location.
var dirty = page.data.dirtyBitSet();
// Kind of slow, we want to shift the rows up in the page up to
// end and then resize down.
const rows = page.data.rows.ptr(page.data.memory);
const len = chunk.end - chunk.start;
for (0..len) |i| {
const src: *Row = &rows[i + chunk.start];
const dst: *Row = &rows[i];
const old_dst = dst.*;
dst.* = src.*;
src.* = old_dst;
dirty.setValue(i, dirty.isSet(i + chunk.start));
}
// We need to clear the rows we're about to truncate.
for (len..page.data.size.rows) |i| {
page.data.clearCells(&rows[i], 0, page.data.size.cols);
}
page.data.size.rows = @intCast(len);
total_rows += len;
// Updating tracked pins
// Remap our tracked pins by changing the page and
// offsetting the Y position based on the chunk start.
if (opts.tracked_pins) |remap| {
const pin_keys = self.tracked_pins.keys();
for (pin_keys) |p| {
// We're only interested in pins that were within the chunk.
if (p.page != chunk.page or
p.y < chunk.start or
p.y >= chunk.end) continue;