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tweaks: call wattron()/wattroff() only when actually painting something 

A syntax has on average a dozen coloring rules, but on average maybe
three or four pieces of text (rough estimate) in a line get painted.
So, on average, it is cheaper to call wattron() and wattroff() only
when actually coloring a piece of text, instead of calling wattron()
before starting to evaluate each rule and wattroff() after finishing
its evaluation.
master
Benno Schulenberg 2021-01-23 17:20:32 +01:00
parent 895de17a58
commit 9d8388e836
1 changed files with 14 additions and 7 deletions
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21
src/winio.c
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@ -2505,8 +2505,6 @@ void draw_row(int row, const char *converted, linestruct *line, size_t from_col)
regmatch_t startmatch, endmatch;
/* The match positions of the start and end regexes. */
wattron(edit, varnish->attributes);
/* First case: varnish is a single-line expression. */
if (varnish->end == NULL) {
while (index < till_x) {
@ -2539,9 +2537,12 @@ void draw_row(int row, const char *converted, linestruct *line, size_t from_col)
paintlen = actual_x(thetext, wideness(line->data,
match.rm_eo) - from_col - start_col);
wattron(edit, varnish->attributes);
mvwaddnstr(edit, row, margin + start_col, thetext, paintlen);
wattroff(edit, varnish->attributes);
}
goto tail_of_loop;
continue;
}
/* Second case: varnish is a multiline expression. */
@ -2622,21 +2623,25 @@ void draw_row(int row, const char *converted, linestruct *line, size_t from_col)
/* If there is no end, there is nothing to paint. */
if (end_line == NULL) {
line->multidata[varnish->id] = CWOULDBE;
goto tail_of_loop;
continue;
}
/* If the end is on a later line, paint whole line, and be done. */
if (end_line != line) {
wattron(edit, varnish->attributes);
mvwaddnstr(edit, row, margin, converted, -1);
wattroff(edit, varnish->attributes);
line->multidata[varnish->id] = CWHOLELINE;
goto tail_of_loop;
continue;
}
/* Only if it is visible, paint the part to be coloured. */
if (endmatch.rm_eo > from_x) {
paintlen = actual_x(converted, wideness(line->data,
endmatch.rm_eo) - from_col);
wattron(edit, varnish->attributes);
mvwaddnstr(edit, row, margin, converted, paintlen);
wattroff(edit, varnish->attributes);
}
line->multidata[varnish->id] = CBEGINBEFORE;
@ -2673,8 +2678,10 @@ void draw_row(int row, const char *converted, linestruct *line, size_t from_col)
paintlen = actual_x(thetext, wideness(line->data,
endmatch.rm_eo) - from_col - start_col);
wattron(edit, varnish->attributes);
mvwaddnstr(edit, row, margin + start_col,
thetext, paintlen);
wattroff(edit, varnish->attributes);
line->multidata[varnish->id] = CSTARTENDHERE;
}
@ -2703,12 +2710,12 @@ void draw_row(int row, const char *converted, linestruct *line, size_t from_col)
}
/* Paint the rest of the line, and we're done. */
wattron(edit, varnish->attributes);
mvwaddnstr(edit, row, margin + start_col, thetext, -1);
wattroff(edit, varnish->attributes);
line->multidata[varnish->id] = CENDAFTER;
break;
}
tail_of_loop:
wattroff(edit, varnish->attributes);
}
}
#endif /* ENABLE_COLOR */