Re: [PATCH 12/20] mt9m111: s_crop add calculation of output size

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On Fri, 30 Jul 2010, Michael Grzeschik wrote:

> Signed-off-by: Philipp Wiesner <p.wiesner@xxxxxxxxx>
> Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
> ---
>  drivers/media/video/mt9m111.c |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/media/video/mt9m111.c b/drivers/media/video/mt9m111.c
> index cc0f996..2758a97 100644
> --- a/drivers/media/video/mt9m111.c
> +++ b/drivers/media/video/mt9m111.c
> @@ -472,11 +472,19 @@ static int mt9m111_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
>  	struct mt9m111 *mt9m111 = to_mt9m111(client);
>  	struct mt9m111_format format;
>  	struct v4l2_mbus_framefmt *mf = &format.mf;
> +	s32 rectwidth	= mt9m111->format.rect.width;
> +	s32 rectheight	= mt9m111->format.rect.height;
> +	u32 pixwidth	= mt9m111->format.mf.width;
> +	u32 pixheight	= mt9m111->format.mf.height;
>  	int ret;
>  
>  	format.rect	= a->c;
>  	format.mf	= mt9m111->format.mf;
>  
> +	/* calculate output size, maintain current scaling factors */
> +	format.mf.width = pixwidth / rectwidth * format.mf.width;
> +	format.mf.height = pixheight / rectheight * format.mf.height;

Again - don't understand:

	u32 pixwidth    = mt9m111->format.mf.width;
	format.mf       = mt9m111->format.mf;
	format.mf.width = pixwidth / rectwidth * format.mf.width;

this means

	format.mf.width = mt9m111->format.mf.width / rectwidth * mt9m111->format.mf.width;

which makes no sense to me. Can you explain?

> +
>  	dev_dbg(&client->dev, "%s: rect: left=%d top=%d width=%d height=%d\n",
>  		__func__, a->c.left, a->c.top, a->c.width, a->c.height);
>  	dev_dbg(&client->dev, "%s: mf: width=%d height=%d pixelcode=%d "
> -- 
> 1.7.1

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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