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fbcon: smart blitter usage for scrolling

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This patch replaces the current SCROLL_MOVE method with smarter method using
the same logic as the SCROLL_REDRAW method.  This brings these two methods
much closer in performance and benefits all framebuffers which uses the
SCROLL_MOVE method.

[adaplas]
- remove unnecessary char attribute checking
- whitespace cleanups and 80-column line fixes

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2007-07-17 04:05:25 -07:00 committed by Linus Torvalds
parent 5d2b56c69c
commit bad07ff74c
1 changed files with 68 additions and 8 deletions
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76
drivers/video/console/fbcon.c
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@ -1704,6 +1704,56 @@ static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
}
}
static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
struct display *p, int line, int count, int ycount)
{
int offset = ycount * vc->vc_cols;
unsigned short *d = (unsigned short *)
(vc->vc_origin + vc->vc_size_row * line);
unsigned short *s = d + offset;
struct fbcon_ops *ops = info->fbcon_par;
while (count--) {
unsigned short *start = s;
unsigned short *le = advance_row(s, 1);
unsigned short c;
int x = 0;
do {
c = scr_readw(s);
if (c == scr_readw(d)) {
if (s > start) {
ops->bmove(vc, info, line + ycount, x,
line, x, 1, s-start);
x += s - start + 1;
start = s + 1;
} else {
x++;
start++;
}
}
scr_writew(c, d);
console_conditional_schedule();
s++;
d++;
} while (s < le);
if (s > start)
ops->bmove(vc, info, line + ycount, x, line, x, 1,
s-start);
console_conditional_schedule();
if (ycount > 0)
line++;
else {
line--;
/* NOTE: We subtract two lines from these pointers */
s -= vc->vc_size_row;
d -= vc->vc_size_row;
}
}
}
static void fbcon_redraw(struct vc_data *vc, struct display *p,
int line, int count, int offset)
{
@ -1789,7 +1839,6 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
{
struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
struct display *p = &fb_display[vc->vc_num];
struct fbcon_ops *ops = info->fbcon_par;
int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
if (fbcon_is_inactive(vc, info))
@ -1813,10 +1862,15 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
goto redraw_up;
switch (p->scrollmode) {
case SCROLL_MOVE:
ops->bmove(vc, info, t + count, 0, t, 0,
b - t - count, vc->vc_cols);
ops->clear(vc, info, b - count, 0, count,
vc->vc_cols);
fbcon_redraw_blit(vc, info, p, t, b - t - count,
count);
fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
scr_memsetw((unsigned short *) (vc->vc_origin +
vc->vc_size_row *
(b - count)),
vc->vc_video_erase_char,
vc->vc_size_row * count);
return 1;
break;
case SCROLL_WRAP_MOVE:
@ -1899,9 +1953,15 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
goto redraw_down;
switch (p->scrollmode) {
case SCROLL_MOVE:
ops->bmove(vc, info, t, 0, t + count, 0,
b - t - count, vc->vc_cols);
ops->clear(vc, info, t, 0, count, vc->vc_cols);
fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
-count);
fbcon_clear(vc, t, 0, count, vc->vc_cols);
scr_memsetw((unsigned short *) (vc->vc_origin +
vc->vc_size_row *
t),
vc->vc_video_erase_char,
vc->vc_size_row * count);
return 1;
break;
case SCROLL_WRAP_MOVE: