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scrolling: initial implementation of scrolling region when reverse scrolling

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Daniel Eklöf 2019-07-03 14:16:01 +02:00
parent 1f343527f0
commit da305abdd8
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1 changed files with 38 additions and 2 deletions
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40
terminal.c
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@ -295,8 +295,44 @@ void
term_scroll_reverse_partial(struct terminal *term,
struct scroll_region region, int rows)
{
assert(region.start == 0);
assert(region.end == term->rows);
if (region.end < term->rows) {
grid_memmove(
term->grid,
(region.end - rows) * term->cols,
region.end * term->cols,
(term->rows - region.end) * term->cols);
tll_foreach(term->grid->damage, it) {
int start = it->item.range.start - term->grid->offset;
int end = start + it->item.range.length;
if (end > region.end * term->cols) {
assert(start >= region.end * term->cols);
it->item.range.start -= rows * term->cols;
}
}
}
if (region.start > 0) {
grid_memmove(
term->grid, -rows * term->cols, 0, region.start * term->cols);
tll_foreach(term->grid->damage, it) {
int start = it->item.range.start - term->grid->offset;
int end __attribute__((unused)) = start + it->item.range.length;
if (start < region.start * term->cols) {
if (end > region.start * term->cols) {
LOG_ERR("region.start = %d, rows = %d, damage.start = %d, damage.end = %d (%s)",
region.start, rows, start, end, it->item.type == DAMAGE_UPDATE ? "UPDATE" : "ERASE");
abort();
}
assert(end <= region.start * term->cols);
it->item.range.start -= rows * term->cols;
}
}
}
term->grid->offset -= rows * term->cols;