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scrolling: implement partial scrolling

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Daniel Eklöf 2019-07-01 19:20:21 +02:00
parent 63e46b7b0b
commit 24395cf4cd
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GPG key ID: 5BBD4992C116573F
1 changed files with 46 additions and 24 deletions
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70
terminal.c
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@ -86,6 +86,7 @@ damage_adjust_after_scroll(struct terminal *term, enum damage_type damage_type,
struct scroll_region region, int lines)
{
tll_foreach(term->grid->damage, it) {
#if 0
if (it->item.range.start < term->grid->offset) {
int end = it->item.range.start + it->item.range.length;
if (end >= term->grid->offset) {
@ -95,6 +96,12 @@ damage_adjust_after_scroll(struct terminal *term, enum damage_type damage_type,
tll_remove(term->grid->damage, it);
}
}
#endif
int start = it->item.range.start;
int end = start + it->item.range.length;
if (start -
}
}
#endif
@ -190,37 +197,52 @@ void
term_scroll_partial(struct terminal *term, struct scroll_region region, int rows)
{
LOG_DBG("scroll: %d rows", rows);
if (rows >= region.end - region.start) {
assert(false && "untested");
return;
if (region.start > 0) {
/* TODO: check if it's worth memoving the scroll area instead,
* under certain circumstances */
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 = start + it->item.range.length;
if (start < region.start) {
assert(end <= region.start);
it->item.range.start += rows * term->cols;
}
}
}
#if 0
int cell_dst = (region.start + 0) * term->cols;
int cell_src = (region.start + rows) * term->cols;
int cell_count = (region.end - region.start - rows) * term->cols;
if (region.end < term->rows) {
/* Copy scrolled-up bottom region to new bottom region */
grid_memmove(
term->grid,
(region.end + rows) * term->cols,
region.end * term->cols,
(term->rows - region.end) * term->cols);
LOG_DBG("moving %d lines from row %d to row %d", cell_count / term->cols,
cell_src / term->cols, cell_dst / term->cols);
tll_foreach(term->grid->damage, it) {
int start = it->item.range.start - term->grid->offset;
int end = start + it->item.range.length;
const int bytes = cell_count * sizeof(term->grid->cells[0]);
memmove(
&term->grid->cells[cell_dst], &term->grid->cells[cell_src],
bytes);
memset(&term->grid->cells[(region.end - rows) * term->cols], 0,
rows * term->cols * sizeof(term->grid->cells[0]));
term_damage_scroll(term, DAMAGE_SCROLL, region, rows);
#else
/* TODO */
assert(region.start == 0 && region.end == term->rows);
assert(rows < term->rows);
if (end > region.end) {
assert(start >= region.end);
it->item.range.start += rows * term->cols;
}
}
}
/* Offset grid origin */
term->grid->offset += rows * term->cols;
grid_memset(term->grid, (region.end - rows) * term->cols, 0, rows * term->cols);
/* Clear scrolled-in lines */
grid_memset(
term->grid,
max(0, region.end - rows) * term->cols, 0, rows * term->cols);
term_damage_scroll(term, DAMAGE_SCROLL, region, rows);
#endif
}
void