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vt: extract attribute inversion to vc_invert_attr

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We continue cleaning up do_con_write. This (hopefully) makes the
inversion code obvious.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200615074910.19267-14-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2020-06-15 09:48:46 +02:00 committed by Greg Kroah-Hartman
parent ede98d12b6
commit 881c8783e9
1 changed files with 16 additions and 8 deletions
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24
drivers/tty/vt/vt.c
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@ -2658,6 +2658,21 @@ need_more_bytes:
return -1;
}
static inline unsigned char vc_invert_attr(const struct vc_data *vc)
{
if (!vc->vc_can_do_color)
return vc->vc_attr ^ 0x08;
if (vc->vc_hi_font_mask == 0x100)
return (vc->vc_attr & 0x11) |
((vc->vc_attr & 0xe0) >> 4) |
((vc->vc_attr & 0x0e) << 4);
return (vc->vc_attr & 0x88) |
((vc->vc_attr & 0x70) >> 4) |
((vc->vc_attr & 0x07) << 4);
}
/* acquires console_lock */
static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
@ -2776,14 +2791,7 @@ rescan_last_byte:
if (!inverse) {
vc_attr = vc->vc_attr;
} else {
/* invert vc_attr */
if (!vc->vc_can_do_color) {
vc_attr = (vc->vc_attr) ^ 0x08;
} else if (vc->vc_hi_font_mask == 0x100) {
vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
} else {
vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
}
vc_attr = vc_invert_attr(vc);
con_flush(vc, draw_from, draw_to, &draw_x);
}