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There is no need to clear every line entirely before drawing to it, this

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means moving the cursor and messes up wrapping. Better to just clear the
sections that aren't written over. GitHub issue 2537.
This commit is contained in:
nicm
2021-01-18 10:27:54 +00:00
parent 71c590a37f
commit 91d112bf12
4 changed files with 26 additions and 21 deletions
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32
screen-write.c
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@ -259,7 +259,6 @@ screen_write_start_callback(struct screen_write_ctx *ctx, struct screen *s,
}
}
/* Initialize writing. */
void
screen_write_start(struct screen_write_ctx *ctx, struct screen *s)
@ -1517,6 +1516,7 @@ screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
struct screen_write_collect_item *ci, *tmp;
struct screen_write_collect_line *cl;
u_int y, cx, cy, items = 0;
int clear = 0;
struct tty_ctx ttyctx;
size_t written = 0;
@ -1540,22 +1540,29 @@ screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
cx = s->cx; cy = s->cy;
for (y = 0; y < screen_size_y(s); y++) {
cl = &ctx->s->write_list[y];
if (cl->bg != 0) {
screen_write_set_cursor(ctx, 0, y);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = cl->bg - 1;
tty_write(tty_cmd_clearline, &ttyctx);
}
TAILQ_FOREACH_SAFE(ci, &cl->items, entry, tmp) {
if (clear != -1 &&
(u_int)clear != ci->x &&
cl->bg != 0) {
screen_write_set_cursor(ctx, clear, y);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = cl->bg - 1;
ttyctx.num = ci->x - clear;
log_debug("clear %u at %u", ttyctx.num, clear);
tty_write(tty_cmd_clearcharacter, &ttyctx);
}
screen_write_set_cursor(ctx, ci->x, y);
if (ci->type == CLEAR_END) {
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = ci->bg;
tty_write(tty_cmd_clearendofline, &ttyctx);
clear = -1;
} else if (ci->type == CLEAR_START) {
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = ci->bg;
tty_write(tty_cmd_clearstartofline, &ttyctx);
clear = ci->x + 1;
} else {
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.cell = &ci->gc;
@ -1563,6 +1570,7 @@ screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
ttyctx.ptr = cl->data + ci->x;
ttyctx.num = ci->used;
tty_write(tty_cmd_cells, &ttyctx);
clear = ci->x + ci->used;
}
items++;
@ -1571,6 +1579,16 @@ screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
TAILQ_REMOVE(&cl->items, ci, entry);
free(ci);
}
if (clear != -1 &&
(u_int)clear != screen_size_x(s) - 1 &&
cl->bg != 0) {
screen_write_set_cursor(ctx, clear, y);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = cl->bg - 1;
log_debug("clear to end at %u", clear);
tty_write(tty_cmd_clearendofline, &ttyctx);
}
clear = 0;
cl->bg = 0;
}
s->cx = cx; s->cy = cy;