All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Sidong Yang <realwakka@gmail.com>
Cc: David Airlie <airlied@linux.ie>,
	Haneen Mohammed <hamohammed.sa@gmail.com>,
	dri-devel@lists.freedesktop.org,
	Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drm/vkms: Use alpha value to blend values.
Date: Mon, 2 Sep 2019 15:28:58 +0300	[thread overview]
Message-ID: <20190902122858.GU7482@intel.com> (raw)
In-Reply-To: <20190831172546.GA1972@raspberrypi>

On Sat, Aug 31, 2019 at 06:25:46PM +0100, Sidong Yang wrote:
> Use alpha value to blend source value and destination value Instead of
> just overwrite with source value.
> 
> Signed-off-by: Sidong Yang <realwakka@gmail.com>
> ---
>  drivers/gpu/drm/vkms/vkms_composer.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
> index d5585695c64d..b776185e5cb5 100644
> --- a/drivers/gpu/drm/vkms/vkms_composer.c
> +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> @@ -75,6 +75,9 @@ static void blend(void *vaddr_dst, void *vaddr_src,
>  	int y_limit = y_src + h_dst;
>  	int x_limit = x_src + w_dst;
>  
> +	u8 *src, *dst;
> +	u32 alpha, inv_alpha;

These could all live in a tighter scope.

Apart from that lgtm
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +
>  	for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
>  		for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
>  			offset_dst = dest_composer->offset
> @@ -84,8 +87,14 @@ static void blend(void *vaddr_dst, void *vaddr_src,
>  				     + (i * src_composer->pitch)
>  				     + (j * src_composer->cpp);
>  
> -			memcpy(vaddr_dst + offset_dst,
> -			       vaddr_src + offset_src, sizeof(u32));
> +			src = vaddr_src + offset_src;
> +			dst = vaddr_dst + offset_dst;
> +			alpha = src[3] + 1;
> +			inv_alpha = 256 - src[3];
> +			dst[0] = (alpha * src[0] + inv_alpha * dst[0]) >> 8;
> +			dst[1] = (alpha * src[1] + inv_alpha * dst[1]) >> 8;
> +			dst[2] = (alpha * src[2] + inv_alpha * dst[2]) >> 8;
> +			dst[3] = 0xff;
>  		}
>  		i_dst++;
>  	}
> -- 
> 2.20.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Ville Syrjälä
Intel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

WARNING: multiple messages have this Message-ID (diff)
From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Sidong Yang <realwakka@gmail.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>,
	David Airlie <airlied@linux.ie>,
	Haneen Mohammed <hamohammed.sa@gmail.com>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drm/vkms: Use alpha value to blend values.
Date: Mon, 2 Sep 2019 15:28:58 +0300	[thread overview]
Message-ID: <20190902122858.GU7482@intel.com> (raw)
In-Reply-To: <20190831172546.GA1972@raspberrypi>

On Sat, Aug 31, 2019 at 06:25:46PM +0100, Sidong Yang wrote:
> Use alpha value to blend source value and destination value Instead of
> just overwrite with source value.
> 
> Signed-off-by: Sidong Yang <realwakka@gmail.com>
> ---
>  drivers/gpu/drm/vkms/vkms_composer.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
> index d5585695c64d..b776185e5cb5 100644
> --- a/drivers/gpu/drm/vkms/vkms_composer.c
> +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> @@ -75,6 +75,9 @@ static void blend(void *vaddr_dst, void *vaddr_src,
>  	int y_limit = y_src + h_dst;
>  	int x_limit = x_src + w_dst;
>  
> +	u8 *src, *dst;
> +	u32 alpha, inv_alpha;

These could all live in a tighter scope.

Apart from that lgtm
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +
>  	for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
>  		for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
>  			offset_dst = dest_composer->offset
> @@ -84,8 +87,14 @@ static void blend(void *vaddr_dst, void *vaddr_src,
>  				     + (i * src_composer->pitch)
>  				     + (j * src_composer->cpp);
>  
> -			memcpy(vaddr_dst + offset_dst,
> -			       vaddr_src + offset_src, sizeof(u32));
> +			src = vaddr_src + offset_src;
> +			dst = vaddr_dst + offset_dst;
> +			alpha = src[3] + 1;
> +			inv_alpha = 256 - src[3];
> +			dst[0] = (alpha * src[0] + inv_alpha * dst[0]) >> 8;
> +			dst[1] = (alpha * src[1] + inv_alpha * dst[1]) >> 8;
> +			dst[2] = (alpha * src[2] + inv_alpha * dst[2]) >> 8;
> +			dst[3] = 0xff;
>  		}
>  		i_dst++;
>  	}
> -- 
> 2.20.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Ville Syrjälä
Intel

  reply	other threads:[~2019-09-02 12:29 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-31 17:25 [PATCH] drm/vkms: Use alpha value to blend values Sidong Yang
2019-08-31 17:25 ` Sidong Yang
2019-09-02 12:28 ` Ville Syrjälä [this message]
2019-09-02 12:28   ` Ville Syrjälä
2019-09-04  7:27   ` Sidong Yang
2019-09-04  7:27     ` Sidong Yang
2019-09-04 15:48     ` Ville Syrjälä
  -- strict thread matches above, loose matches on Subject: below --
2019-09-01  8:56 Sidong Yang
2020-08-18 16:02 Sidong Yang
2020-08-18 16:02 ` Sidong Yang
2020-08-25  3:15 ` Rodrigo Siqueira
2020-08-25  3:15   ` Rodrigo Siqueira
2020-08-25 12:35   ` Sidong Yang
2020-08-25 12:35     ` Sidong Yang

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190902122858.GU7482@intel.com \
    --to=ville.syrjala@linux.intel.com \
    --cc=airlied@linux.ie \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=hamohammed.sa@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=realwakka@gmail.com \
    --cc=rodrigosiqueiramelo@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.