Merge pull request #26813 from VanaIgr/screen-pos-speedup

perf: make screen size and position calculations more efficient

N/A patches for version.c:
vim-patch:9.1.0037: Calling get_breakindent_win() repeatedly when computing virtcol
vim-patch:9.1.0038: Unnecessary loop in getvcol()

1 files changed, 12 insertions, 10 deletions

diff --git a/src/nvim/getchar.c b/src/nvim/getchar.c
index 23937a6bb5..6515cc84da 100644
--- a/src/nvim/getchar.c
+++ b/src/nvim/getchar.c
@@ -2502,20 +2502,22 @@ static int vgetorpeek(bool advance)
               // we are expecting to truncate the trailing
               // white-space, so find the last non-white
               // character -- webb
-              if (did_ai
-                  && *skipwhite(get_cursor_line_ptr() + curwin->w_cursor.col) == NUL) {
+              if (did_ai && *skipwhite(get_cursor_line_ptr() + curwin->w_cursor.col) == NUL) {
                 curwin->w_wcol = 0;
                 ptr = get_cursor_line_ptr();
-                chartabsize_T cts;
-                init_chartabsize_arg(&cts, curwin, curwin->w_cursor.lnum, 0, ptr, ptr);
-                while (cts.cts_ptr < ptr + curwin->w_cursor.col) {
-                  if (!ascii_iswhite(*cts.cts_ptr)) {
-                    curwin->w_wcol = cts.cts_vcol;
+                char *endptr = ptr + curwin->w_cursor.col;
+
+                CharsizeArg arg;
+                CSType cstype = init_charsize_arg(&arg, curwin, curwin->w_cursor.lnum, ptr);
+                StrCharInfo ci = utf_ptr2StrCharInfo(ptr);
+                int vcol = 0;
+                while (ci.ptr < endptr) {
+                  if (!ascii_iswhite(ci.chr.value)) {
+                    curwin->w_wcol = vcol;
                   }
-                  cts.cts_vcol += lbr_chartabsize(&cts);
-                  cts.cts_ptr += utfc_ptr2len(cts.cts_ptr);
+                  vcol += win_charsize(cstype, vcol, ci.ptr, ci.chr.value, &arg).width;
+                  ci = utfc_next(ci);
                 }
-                clear_chartabsize_arg(&cts);
 
                 curwin->w_wrow = curwin->w_cline_row
                                  + curwin->w_wcol / curwin->w_width_inner;