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vt: wip: implement scrolling region

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This is largely untested, but existing scrolling code has been
converted to using a terminal-global scrolling region that is defined
as start-end of the scrollable region.

This is compared to the old code where the scrolling region where
defined in terms of marginals, counted in lines from top and from
bottom.
This commit is contained in:
Daniel Eklöf 2019-06-23 18:02:49 +02:00
parent 7183b2f0fe
commit b0a2c54fe8
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GPG key ID: 5BBD4992C116573F
6 changed files with 68 additions and 55 deletions
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50
grid.c
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@ -87,8 +87,11 @@ grid_damage_erase(struct grid *grid, int start, int length)
static void
damage_adjust_after_scroll(struct grid *grid, enum damage_type damage_type,
int top_margin, int bottom_margin, int lines)
int lines)
{
int top_margin = grid->scrolling_region.start;
int bottom_margin = grid->rows - grid->scrolling_region.end;
const int adjustment
= lines * grid->cols * (damage_type == DAMAGE_SCROLL_REVERSE ? -1 : 1);
top_margin *= grid->cols;
@ -131,8 +134,7 @@ damage_adjust_after_scroll(struct grid *grid, enum damage_type damage_type,
}
void
grid_damage_scroll(struct grid *grid, enum damage_type damage_type,
int top_margin, int bottom_margin, int lines)
grid_damage_scroll(struct grid *grid, enum damage_type damage_type, int lines)
{
if (tll_length(grid->damage) > 0 &&
tll_front(grid->damage).type == damage_type)
@ -140,33 +142,26 @@ grid_damage_scroll(struct grid *grid, enum damage_type damage_type,
/* Merge with existing scroll damage */
struct damage *dmg = &tll_front(grid->damage);
assert(dmg->scroll.top_margin == top_margin);
assert(dmg->scroll.bottom_margin == bottom_margin);
dmg->scroll.lines += lines;
const int scrolling_region =
grid->scrolling_region.end - grid->scrolling_region.start;
/* If we've scrolled away the entire screen, replace with an erase */
if (dmg->scroll.lines >= (grid->rows - (dmg->scroll.top_margin +
dmg->scroll.bottom_margin))) {
if (dmg->scroll.lines >= scrolling_region) {
dmg->type = DAMAGE_ERASE;
dmg->range.start = dmg->scroll.top_margin * grid->cols;
dmg->range.length = (grid->rows - top_margin - bottom_margin) * grid->cols;
dmg->range.start = grid->scrolling_region.start * grid->cols;
dmg->range.length = scrolling_region * grid->cols;
}
} else {
struct damage dmg = {
.type = damage_type,
.scroll = {
.top_margin = top_margin,
.bottom_margin = bottom_margin,
.lines = lines
},
.scroll = {.lines = lines},
};
tll_push_front(grid->damage, dmg);
}
damage_adjust_after_scroll(
grid, damage_type, top_margin, bottom_margin, lines);
damage_adjust_after_scroll(grid, damage_type, lines);
}
void
@ -243,15 +238,12 @@ grid_cursor_down(struct grid *grid, int count)
void
grid_scroll(struct grid *grid, int rows)
{
const int top_margin = 0;
const int bottom_margin = 0;
const int grid_rows = grid->rows - top_margin - bottom_margin;
const int grid_rows = grid->scrolling_region.end - grid->scrolling_region.start;
const int top_margin = grid->scrolling_region.start;
const int bottom_margin = grid->rows - grid->scrolling_region.end;
if (rows >= grid_rows) {
assert(false && "untested");
grid_erase(grid,
top_margin * grid->cols,
(grid->rows - bottom_margin) * grid->cols);
return;
}
@ -266,7 +258,7 @@ grid_scroll(struct grid *grid, int rows)
&grid->cells[cell_dst], &grid->cells[cell_src],
bytes);
grid_damage_scroll(grid, DAMAGE_SCROLL, top_margin, bottom_margin, rows);
grid_damage_scroll(grid, DAMAGE_SCROLL, rows);
grid_erase(
grid,
(grid_rows - bottom_margin - rows) * grid->cols,
@ -276,9 +268,9 @@ grid_scroll(struct grid *grid, int rows)
void
grid_scroll_reverse(struct grid *grid, int rows)
{
const int top_margin = 0;
const int bottom_margin = 0;
const int grid_rows = grid->rows - top_margin - bottom_margin;
const int grid_rows = grid->scrolling_region.end - grid->scrolling_region.start;
const int top_margin = grid->scrolling_region.start;
const int bottom_margin = grid->rows - grid->scrolling_region.end;
if (rows >= grid_rows) {
assert(false && "todo");
@ -296,7 +288,7 @@ grid_scroll_reverse(struct grid *grid, int rows)
&grid->cells[cell_dst], &grid->cells[cell_src],
bytes);
grid_damage_scroll(grid, DAMAGE_SCROLL_REVERSE, top_margin, bottom_margin, rows);
grid_damage_scroll(grid, DAMAGE_SCROLL_REVERSE, rows);
grid_erase(
grid,
top_margin * grid->cols,