[PATCH v6 1/5] drm: Add function to convert rect in 16.16 fixed format to regular format

[Mun, Gwan-gyeong]

On Mon, 2020-12-14 at 09:49 -0800, José Roberto de Souza wrote:
> Much more clear to read one function call than four lines doing this
> conversion.
> 
> Cc: dri-devel at lists.freedesktop.org
> Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/drm_rect.c | 15 +++++++++++++++
>  include/drm/drm_rect.h     |  2 ++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_rect.c b/drivers/gpu/drm/drm_rect.c
> index 0460e874896e..24345704b353 100644
> --- a/drivers/gpu/drm/drm_rect.c
> +++ b/drivers/gpu/drm/drm_rect.c
> @@ -373,3 +373,18 @@ void drm_rect_rotate_inv(struct drm_rect *r,
>  	}
>  }
>  EXPORT_SYMBOL(drm_rect_rotate_inv);
> +
> +/**
> + * drm_rect_convert_16_16_to_regular - Convert a rect in 16.16 fixed
> point form
> + * to regular form.
> + * @in: rect in 16.16 fixed point form
> + * @out: rect to be stored the converted value
> + */
> +void drm_rect_convert_16_16_to_regular(struct drm_rect *in, struct
> drm_rect *out)
> +{
> +	out->x1 = in->x1 >> 16;
> +	out->y1 = in->y1 >> 16;
> +	out->x2 = in->x2 >> 16;
> +	out->y2 = in->y2 >> 16;
> +}
> +EXPORT_SYMBOL(drm_rect_convert_16_16_to_regular);
> diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
> index e7f4d24cdd00..2ef8180416cd 100644
> --- a/include/drm/drm_rect.h
> +++ b/include/drm/drm_rect.h
> @@ -223,5 +223,7 @@ void drm_rect_rotate(struct drm_rect *r,
>  void drm_rect_rotate_inv(struct drm_rect *r,
>  			 int width, int height,
>  			 unsigned int rotation);
> +void drm_rect_convert_16_16_to_regular(struct drm_rect *in,
> +				       struct drm_rect *out);
> 
Hi,
if it's purpose is just converting 16.16 fp to integer, how about you
have function prototype like this?
extern inline struct drm_rect
drm_rect_convert_16_16_fp_to_integer(struct drm_rect in)

And if there are no use case on drm core or other drivers except i915
display yet,
before adding this function to drm core, how about you add this
function code to i915 first?

Br,
G.G.
>  #endif