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UI/TUI: improvements and cleanups for scrolling and clearing

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- TUI: _never_ rely on BCE for implicit clearing, only explicit commands.
- TUI: use unibi_erase_chars when possible.
- TUI: use end-exclusive ranges for invalid and cleared areas
- screen: scrolling leaves scrolled in aree undefined. This is a
  conservative change, a client assuming the old semantics will still
  behave correctly.
- screen: factor out vsep handling from line drawing. This is needed
  anyway for the multigrid refactor.
- screen: simplifications of win_do_lines
This commit is contained in:
Björn Linse
2018-11-03 14:40:22 +01:00
parent f8639dc99c
commit 520ec3dbfd
7 changed files with 136 additions and 171 deletions
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25
src/nvim/ugrid.c
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@@ -52,8 +52,7 @@ void ugrid_goto(UGrid *grid, int row, int col)
grid->col = col;
}
void ugrid_scroll(UGrid *grid, int top, int bot, int left, int right,
int count, int *clear_top, int *clear_bot)
void ugrid_scroll(UGrid *grid, int top, int bot, int left, int right, int count)
{
// Compute start/stop/step for the loop below
int start, stop, step;
@@ -76,26 +75,18 @@ void ugrid_scroll(UGrid *grid, int top, int bot, int left, int right,
memcpy(target_row, source_row,
sizeof(UCell) * (size_t)(right - left + 1));
}
// clear cells in the emptied region,
if (count > 0) {
*clear_top = stop;
*clear_bot = stop + count - 1;
} else {
*clear_bot = stop;
*clear_top = stop + count + 1;
}
clear_region(grid, *clear_top, *clear_bot, left, right, 0);
}
static void clear_region(UGrid *grid, int top, int bot, int left, int right,
sattr_T attr)
{
UGRID_FOREACH_CELL(grid, top, bot, left, right, {
cell->data[0] = ' ';
cell->data[1] = 0;
cell->attr = attr;
});
for (int row = top; row <= bot; row++) {
UGRID_FOREACH_CELL(grid, row, left, right+1, {
cell->data[0] = ' ';
cell->data[1] = 0;
cell->attr = attr;
});
}
}
static void destroy_cells(UGrid *grid)