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vte: implement bce-mode (background color erase mode)

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BCE is implemented by all major terminal emulators and activated by
default. If used, then every erase/insert/scroll/delete operation will
redraw the background of the erased/new characters with the current
background color instead of the default background color.

There is currently no way to control this behavior from an application so
you cannot turn it off. However, every terminfo based application can read
whether it is activated from the terminfo database.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
David Herrmann 2012-09-08 12:56:37 +02:00
parent 5da8d6297c
commit 52c57a51b6
1 changed files with 9 additions and 2 deletions
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11
src/vte.c
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@ -133,6 +133,7 @@ enum parser_action {
#define FLAG_AUTO_WRAP_MODE 0x00001000 /* Auto line wrap mode */
#define FLAG_AUTO_REPEAT_MODE 0x00002000 /* Auto repeat key press; TODO: implement */
#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) */
struct vte_saved_state {
unsigned int cursor_x;
@ -365,7 +366,6 @@ int kmscon_vte_new(struct kmscon_vte **out, struct kmscon_console *con,
goto err_free;
kmscon_vte_reset(vte);
kmscon_console_set_def_attr(vte->con, &vte->def_attr);
kmscon_console_erase_screen(vte->con, false);
log_debug("new vte object");
@ -500,6 +500,8 @@ static void restore_state(struct kmscon_vte *vte)
kmscon_console_move_to(vte->con, vte->saved_state.cursor_x,
vte->saved_state.cursor_y);
vte->cattr = vte->saved_state.cattr;
if (vte->flags & FLAG_BACKGROUND_COLOR_ERASE_MODE)
kmscon_console_set_def_attr(vte->con, &vte->cattr);
vte->gl = vte->saved_state.gl;
vte->gr = vte->saved_state.gr;
@ -540,6 +542,7 @@ void kmscon_vte_reset(struct kmscon_vte *vte)
vte->flags |= FLAG_AUTO_REPEAT_MODE;
vte->flags |= FLAG_SEND_RECEIVE_MODE;
vte->flags |= FLAG_AUTO_WRAP_MODE;
vte->flags |= FLAG_BACKGROUND_COLOR_ERASE_MODE;
kmscon_console_reset(vte->con);
kmscon_console_set_flags(vte->con, KMSCON_CONSOLE_AUTO_WRAP);
@ -563,16 +566,17 @@ void kmscon_vte_reset(struct kmscon_vte *vte)
vte->cattr.bold = 0;
vte->cattr.underline = 0;
vte->cattr.inverse = 0;
kmscon_console_set_def_attr(vte->con, &vte->def_attr);
reset_state(vte);
}
static void hard_reset(struct kmscon_vte *vte)
{
kmscon_vte_reset(vte);
kmscon_console_erase_screen(vte->con, false);
kmscon_console_clear_sb(vte->con);
kmscon_console_move_to(vte->con, 0, 0);
kmscon_vte_reset(vte);
}
static void send_primary_da(struct kmscon_vte *vte)
@ -1148,6 +1152,9 @@ static void csi_attribute(struct kmscon_vte *vte)
vte->csi_argv[i]);
}
}
if (vte->flags & FLAG_BACKGROUND_COLOR_ERASE_MODE)
kmscon_console_set_def_attr(vte->con, &vte->cattr);
}
static void csi_soft_reset(struct kmscon_vte *vte)