[PATCH 1/3] fbuffer: simplify address computations in fb8-toggle-cursor

[Thomas Huth]

On Thu, 28 May 2015 15:13:14 +0200
Greg Kurz <gkurz at linux.vnet.ibm.com> wrote:

> The inner loop deals with a contiguous region. It could easily be replaced
> by faster board specific functions like hv-logical-memop in board-qemu.
> Since hv-logical-memop does not return an address, let's have the enclosing
> loop compute the next line address by itself and drop the confusing
> "char-width screen-depth * -" address adjustment.
> 
> Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm.com>
> ---
>  slof/fs/fbuffer.fs |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/slof/fs/fbuffer.fs b/slof/fs/fbuffer.fs
> index 756f05a..faae6a9 100644
> --- a/slof/fs/fbuffer.fs
> +++ b/slof/fs/fbuffer.fs
> @@ -99,8 +99,8 @@ CREATE bitmap-buffer 400 4 * allot
>  : fb8-toggle-cursor ( -- )
>  	line# fb8-line2addr column# fb8-columns2bytes +
>  	char-height 0 ?DO
> -		char-width screen-depth * 0 ?DO dup dup rb@ -1 xor swap rb! 1+ LOOP
> -		screen-width screen-depth * + char-width screen-depth * -
> +		dup char-width screen-depth * 0 ?DO dup dup rb@ -1 xor swap rb! 1+ LOOP drop
> +		screen-width screen-depth * +
>  	LOOP drop
>  ;

Reviewed-by: Thomas Huth <thuth at redhat.com>