From 4cffc36013a2d9508c947813a352aaf0b6cfa4c3 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Tue, 27 May 2014 15:12:43 +0200
Subject: [PATCH] v4l: Add premultiplied alpha flag for pixel formats

When set, the new V4L2_PIX_FMT_FLAG_PREMUL_ALPHA flag indicates that the
pixel values are premultiplied by the alpha channel value.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
(cherry picked from commit e6619dfbf287a75082ec04bc2a8d2df6e3a16299)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Conflicts:
	Documentation/DocBook/media/v4l/v4l2.xml
---
 Documentation/DocBook/media/v4l/pixfmt.xml | 28 +++++++++++++++++++++++++++-
 drivers/media/v4l2-core/v4l2-ioctl.c       |  5 +++--
 include/uapi/linux/videodev2.h             |  8 +++++++-
 3 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
index 6e1e520..75882a4 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -126,6 +126,12 @@ extended fields were set to zero. On return drivers must set the
 <constant>V4L2_PIX_FMT_PRIV_MAGIC</constant> and all the extended field to
 applicable values.</para></entry>
 	</row>
+	<row>
+	  <entry>__u32</entry>
+	  <entry><structfield>flags</structfield></entry>
+	    <entry>Flags set by the application or driver, see <xref
+linkend="format-flags" />.</entry>
+	</row>
       </tbody>
     </tgroup>
   </table>
@@ -211,9 +217,15 @@ codes can be used.</entry>
           and the number of valid entries in the
           <structfield>plane_fmt</structfield> array.</entry>
         </row>
+	<row>
+	  <entry>__u8</entry>
+	  <entry><structfield>flags</structfield></entry>
+	  <entry>Flags set by the application or driver, see <xref
+linkend="format-flags" />.</entry>
+	</row>
         <row>
           <entry>__u8</entry>
-          <entry><structfield>reserved[11]</structfield></entry>
+          <entry><structfield>reserved[10]</structfield></entry>
           <entry>Reserved for future extensions. Should be zeroed by the
            application.</entry>
         </row>
@@ -1059,4 +1071,18 @@ concatenated to form the JPEG stream. </para>
 	</tbody>
       </tgroup>
     </table>
+
+    <table frame="none" pgwide="1" id="format-flags">
+      <title>Format Flags</title>
+      <tgroup cols="3">
+	&cs-def;
+	<tbody valign="top">
+	  <row>
+	    <entry><constant>V4L2_PIX_FMT_FLAG_PREMUL_ALPHA</constant></entry>
+	    <entry>0x00000001</entry>
+	    <entry>The pixel values are premultiplied by the alpha channel value.</entry>
+	  </row>
+	</tbody>
+      </tgroup>
+    </table>
   </section>
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index feb9e34..9692009 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -254,7 +254,8 @@ static void v4l_print_format(const void *arg, bool write_only)
 		pix = &p->fmt.pix;
 		pr_cont(", width=%u, height=%u, "
 			"pixelformat=%c%c%c%c, field=%s, "
-			"bytesperline=%u, sizeimage=%u, colorspace=%d\n",
+			"bytesperline=%u, sizeimage=%u, colorspace=%d, "
+			"flags %u\n",
 			pix->width, pix->height,
 			(pix->pixelformat & 0xff),
 			(pix->pixelformat >>  8) & 0xff,
@@ -262,7 +263,7 @@ static void v4l_print_format(const void *arg, bool write_only)
 			(pix->pixelformat >> 24) & 0xff,
 			prt_names(pix->field, v4l2_field_names),
 			pix->bytesperline, pix->sizeimage,
-			pix->colorspace);
+			pix->colorspace, pix->flags);
 		break;
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index e6b41cf..8d6646e 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -283,6 +283,7 @@ struct v4l2_pix_format {
 	__u32          		sizeimage;
 	__u32			colorspace;	/* enum v4l2_colorspace */
 	__u32			priv;		/* private data, depends on pixelformat */
+	__u32			flags;		/* format flags (V4L2_PIX_FMT_FLAG_*) */
 };
 
 /*      Pixel format         FOURCC                          depth  Description  */
@@ -443,6 +444,9 @@ struct v4l2_pix_format {
 /* priv field value to indicates that subsequent fields are valid. */
 #define V4L2_PIX_FMT_PRIV_MAGIC		0xdeadbeef
 
+/* Flags */
+#define V4L2_PIX_FMT_FLAG_PREMUL_ALPHA	0x00000001
+
 /*
  *	F O R M A T   E N U M E R A T I O N
  */
@@ -1699,6 +1703,7 @@ struct v4l2_plane_pix_format {
  * @colorspace:		enum v4l2_colorspace; supplemental to pixelformat
  * @plane_fmt:		per-plane information
  * @num_planes:		number of planes for this format
+ * @flags:		format flags (V4L2_PIX_FMT_FLAG_*)
  */
 struct v4l2_pix_format_mplane {
 	__u32				width;
@@ -1709,7 +1714,8 @@ struct v4l2_pix_format_mplane {
 
 	struct v4l2_plane_pix_format	plane_fmt[VIDEO_MAX_PLANES];
 	__u8				num_planes;
-	__u8				reserved[11];
+	__u8				flags;
+	__u8				reserved[10];
 } __attribute__ ((packed));
 
 /**
-- 
2.7.4