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perf(extmarks): avoid unnecessary marktree traversal with folds (#24306)

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Extreme testcase:
```lua
vim.cmd([[
  call setline(1, ['', '', ''])
  2,3fold
]])
local ns = vim.api.nvim_create_namespace('')
for _ = 1, 100000 do
  vim.api.nvim_buf_set_extmark(0, ns, 1, 0, { virt_lines = {{{ '' }}} })
end
local start_time = vim.uv.hrtime()
vim.api.nvim_win_text_height(0, {})
local stop_time = vim.uv.hrtime()
print(stop_time - start_time)
```
Before this PR: 21542011
After this PR: 43874
This commit is contained in:
zeertzjq 2023-07-11 08:57:55 +08:00 committed by GitHub
parent db8fe63a93
commit 19fb573ad9
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 18 additions and 10 deletions
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28
src/nvim/decoration.c
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@ -592,26 +592,34 @@ int decor_virt_lines(win_T *wp, linenr_T lnum, VirtLines *lines, TriState has_fo
return 0;
}
int virt_lines = 0;
int row = MAX(lnum - 2, 0);
int end_row = (int)lnum;
MarkTreeIter itr[1] = { 0 };
marktree_itr_get(buf->b_marktree, row, 0, itr);
assert(lnum > 0);
bool below_fold = lnum > 1 && hasFoldingWin(wp, lnum - 1, NULL, NULL, true, NULL);
if (has_fold == kNone) {
has_fold = hasFoldingWin(wp, lnum, NULL, NULL, true, NULL);
}
const int row = lnum - 1;
const int start_row = below_fold ? row : MAX(row - 1, 0);
const int end_row = has_fold ? row : row + 1;
if (start_row >= end_row) {
return 0;
}
int virt_lines = 0;
MarkTreeIter itr[1] = { 0 };
marktree_itr_get(buf->b_marktree, start_row, 0, itr);
while (true) {
mtkey_t mark = marktree_itr_current(itr);
if (mark.pos.row < 0 || mark.pos.row >= end_row) {
break;
} else if (mt_end(mark) || marktree_decor_level(mark) < kDecorLevelVirtLine) {
} else if (mt_end(mark)
|| marktree_decor_level(mark) < kDecorLevelVirtLine
|| !mark.decor_full) {
goto next_mark;
}
bool above = mark.pos.row > (lnum - 2);
bool has_fold_cur = above ? has_fold : below_fold;
Decoration *decor = mark.decor_full;
if (!has_fold_cur && decor && decor->virt_lines_above == above) {
Decoration *const decor = mark.decor_full;
const int draw_row = mark.pos.row + (decor->virt_lines_above ? 0 : 1);
if (draw_row == row) {
virt_lines += (int)kv_size(decor->virt_lines);
if (lines) {
kv_splice(*lines, decor->virt_lines);