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When writing batches of characters to the screen, we need to clear

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padding or later UTF-8 characters could be displayed incorrectly. GitHub
issue 1090.
This commit is contained in:
nicm 2017-10-05 08:12:24 +00:00
parent d563aa7c7b
commit 6a292f09ba
1 changed files with 23 additions and 0 deletions
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23
screen-write.c
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@ -1243,6 +1243,7 @@ screen_write_collect_end(struct screen_write_ctx *ctx)
struct screen *s = ctx->s;
struct screen_write_collect_item *ci = ctx->item;
struct grid_cell gc;
u_int xx;
if (ci->used == 0)
return;
@ -1255,9 +1256,27 @@ screen_write_collect_end(struct screen_write_ctx *ctx)
log_debug("%s: %u %s (at %u,%u)", __func__, ci->used, ci->data, s->cx,
s->cy);
if (s->cx != 0) {
for (xx = s->cx; xx > 0; xx--) {
grid_view_get_cell(s->grid, xx, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
grid_view_set_cell(s->grid, xx, s->cy, &grid_default_cell);
}
if (gc.data.width > 1)
grid_view_set_cell(s->grid, xx, s->cy, &grid_default_cell);
}
memcpy(&gc, &ci->gc, sizeof gc);
grid_view_set_cells(s->grid, s->cx, s->cy, &gc, ci->data, ci->used);
s->cx += ci->used;
for (xx = s->cx; xx < screen_size_x(s); xx++) {
grid_view_get_cell(s->grid, xx, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
grid_view_set_cell(s->grid, xx, s->cy, &grid_default_cell);
}
}
/* Write cell data, collecting if necessary. */
@ -1388,6 +1407,7 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
* already ensured there is enough room.
*/
for (xx = s->cx + 1; xx < s->cx + width; xx++) {
log_debug("%s: new padding at %u,%u", __func__, xx, s->cy);
grid_view_set_cell(gd, xx, s->cy, &screen_write_pad_cell);
skip = 0;
}
@ -1537,10 +1557,12 @@ screen_write_overwrite(struct screen_write_ctx *ctx, struct grid_cell *gc,
grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
if (~tmp_gc.flags & GRID_FLAG_PADDING)
break;
log_debug("%s: padding at %u,%u", __func__, xx, s->cy);
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
/* Overwrite the character at the start of this padding. */
log_debug("%s: character at %u,%u", __func__, xx, s->cy);
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}
@ -1557,6 +1579,7 @@ screen_write_overwrite(struct screen_write_ctx *ctx, struct grid_cell *gc,
grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
if (~tmp_gc.flags & GRID_FLAG_PADDING)
break;
log_debug("%s: overwrite at %u,%u", __func__, xx, s->cy);
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}