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- Preserve the content of the back scroll buffer when changing the

Browse source 
video mode.

Requested by: a lot of people.
PR: kern/13764
This commit is contained in:
Kazutaka YOKOTA 1999-09-19 08:07:46 +00:00
parent a0d3b21c88
commit d94eccc2ad
3 changed files with 52 additions and 10 deletions
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53
sys/dev/syscons/schistory.c
View file

@ -64,6 +64,7 @@ static int extra_history_size
= SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
/* local functions */
static void copy_history(sc_vtb_t *from, sc_vtb_t *to);
static void history_to_screen(scr_stat *scp);
/* allocate a history buffer */
@ -111,28 +112,60 @@ sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait)
}
}
/* destroy the previous buffer and allocate a new one */
if (prev_history == NULL) {
history = (sc_vtb_t *)malloc(sizeof(*history),
M_DEVBUF,
(wait) ? M_WAITOK : M_NOWAIT);
} else {
extra_history_size += delta;
sc_vtb_destroy(prev_history);
}
/* allocate a new buffer */
history = (sc_vtb_t *)malloc(sizeof(*history),
M_DEVBUF,
(wait) ? M_WAITOK : M_NOWAIT);
if (history != NULL) {
if (lines > min_lines)
extra_history_size -= lines - min_lines;
sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines,
NULL, wait);
sc_vtb_clear(history, scp->sc->scr_map[0x20],
scp->term.cur_color);
if (prev_history != NULL)
copy_history(prev_history, history);
scp->history_pos = sc_vtb_tail(history);
} else {
scp->history_pos = 0;
}
/* destroy the previous buffer */
if (prev_history != NULL) {
extra_history_size += delta;
sc_vtb_destroy(prev_history);
}
scp->history_pos = 0;
scp->history = history;
return 0;
}
static void
copy_history(sc_vtb_t *from, sc_vtb_t *to)
{
int lines;
int cols;
int cols1;
int cols2;
int pos;
int i;
lines = sc_vtb_rows(from);
cols1 = sc_vtb_cols(from);
cols2 = sc_vtb_cols(to);
cols = imin(cols1, cols2);
pos = sc_vtb_tail(from);
for (i = 0; i < lines; ++i) {
sc_vtb_append(from, pos, to, cols);
if (cols < cols2)
sc_vtb_seek(to, sc_vtb_pos(to,
sc_vtb_tail(to),
cols2 - cols));
pos = sc_vtb_pos(from, pos, cols1);
}
}
void
sc_free_history_buffer(scr_stat *scp, int prev_ysize)
{

8
sys/dev/syscons/scvidctl.c
View file

@ -189,6 +189,10 @@ sc_set_text_mode(scr_stat *scp, struct tty *tp, int mode, int xsize, int ysize,
}
/* set up scp */
#ifndef SC_NO_HISTORY
if (scp->history != NULL)
sc_hist_save(scp);
#endif
prev_ysize = scp->ysize;
/*
* This is a kludge to fend off scrn_update() while we
@ -401,6 +405,10 @@ sc_set_pixel_mode(scr_stat *scp, struct tty *tp, int xsize, int ysize,
}
/* set up scp */
#ifndef SC_NO_HISTORY
if (scp->history != NULL)
sc_hist_save(scp);
#endif
prev_ysize = scp->ysize;
scp->status |= (UNKNOWN_MODE | PIXEL_MODE);
scp->status &= ~GRAPHICS_MODE;

1
sys/dev/syscons/syscons.h
View file

@ -489,6 +489,7 @@ int sc_vtb_pos(sc_vtb_t *vtb, int pos, int offset);
#define sc_vtb_tail(vtb) ((vtb)->vtb_tail)
#define sc_vtb_rows(vtb) ((vtb)->vtb_rows)
#define sc_vtb_cols(vtb) ((vtb)->vtb_cols)
void sc_vtb_copy(sc_vtb_t *vtb1, int from, sc_vtb_t *vtb2, int to,
int count);