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tsm: vte: implement alternate-screen modes

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On DECSET 47, 1047-1049 we switch between normal screen mode and alternate
screen mode. xterm and friends support a titeInhibit resource that
disables this feature, so we add a flag to set this, too. However, there
is currently no way to set this on the command-line. If someone needs
that, we can easily add that.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
David Herrmann 2012-10-11 12:17:20 +02:00
parent abd4764199
commit b194ba8340
1 changed files with 61 additions and 0 deletions
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61
src/tsm_vte.c
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@ -134,6 +134,7 @@ enum parser_action {
#define FLAG_NATIONAL_CHARSET_MODE 0x00004000 /* Send keys from nation charsets; TODO: implement */
#define FLAG_BACKGROUND_COLOR_ERASE_MODE 0x00008000 /* Set background color on erase (bce) */
#define FLAG_PREPEND_ESCAPE 0x00010000 /* Prepend escape character to next output */
#define FLAG_TITE_INHIBIT_MODE 0x00020000 /* Prevent switching to alternate screen buffer */
struct vte_saved_state {
unsigned int cursor_x;
@ -176,6 +177,8 @@ struct tsm_vte {
tsm_vte_charset *g3;
struct vte_saved_state saved_state;
unsigned int alt_cursor_x;
unsigned int alt_cursor_y;
};
enum vte_color {
@ -1390,6 +1393,64 @@ static void csi_mode(struct tsm_vte *vte, bool set)
case 42: /* DECNRCM */
set_reset_flag(vte, set, FLAG_NATIONAL_CHARSET_MODE);
continue;
case 47: /* Alternate screen buffer */
if (vte->flags & FLAG_TITE_INHIBIT_MODE)
continue;
if (set)
tsm_screen_set_flags(vte->con,
TSM_SCREEN_ALTERNATE);
else
tsm_screen_reset_flags(vte->con,
TSM_SCREEN_ALTERNATE);
continue;
case 1047: /* Alternate screen buffer with post-erase */
if (vte->flags & FLAG_TITE_INHIBIT_MODE)
continue;
if (set) {
tsm_screen_set_flags(vte->con,
TSM_SCREEN_ALTERNATE);
} else {
tsm_screen_reset_flags(vte->con,
TSM_SCREEN_ALTERNATE);
/* TODO: which screen to clear here? */
tsm_screen_erase_screen(vte->con, false);
}
continue;
case 1048: /* Set/Reset alternate-screen buffer cursor */
if (vte->flags & FLAG_TITE_INHIBIT_MODE)
continue;
if (set) {
vte->alt_cursor_x =
tsm_screen_get_cursor_x(vte->con);
vte->alt_cursor_y =
tsm_screen_get_cursor_y(vte->con);
} else {
tsm_screen_move_to(vte->con, vte->alt_cursor_x,
vte->alt_cursor_y);
}
continue;
case 1049: /* Alternate screen buffer with pre-erase+cursor */
if (vte->flags & FLAG_TITE_INHIBIT_MODE)
continue;
if (set) {
vte->alt_cursor_x =
tsm_screen_get_cursor_x(vte->con);
vte->alt_cursor_y =
tsm_screen_get_cursor_y(vte->con);
tsm_screen_set_flags(vte->con,
TSM_SCREEN_ALTERNATE);
tsm_screen_erase_screen(vte->con, false);
} else {
tsm_screen_reset_flags(vte->con,
TSM_SCREEN_ALTERNATE);
tsm_screen_move_to(vte->con, vte->alt_cursor_x,
vte->alt_cursor_y);
}
continue;
default:
llog_debug(vte, "unknown DEC %set-Mode %d",
set?"S":"Res", vte->csi_argv[i]);