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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2014-05-27 17:12:43 +0400
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-07-17 19:44:47 +0400
commitc96fd46afb34a554406bce9784126b96ad09091e (patch)
tree41da27a48407bbd8d8c50d72221ea7f2ad232754 /Documentation/DocBook
parentd52e23813672c3c72f92e7b39c7408d4b9a40a96 (diff)
downloadlinux-c96fd46afb34a554406bce9784126b96ad09091e.tar.xz
[media] 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> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/media/v4l/pixfmt.xml31
-rw-r--r--Documentation/DocBook/media/v4l/v4l2.xml2
2 files changed, 31 insertions, 2 deletions
diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
index bb36b3829cf9..87ce7f3e7178 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -135,6 +135,12 @@ extended fields were set to zero. On return drivers must set the
<constant>V4L2_PIX_FMT_PRIV_MAGIC</constant> and all the extended fields 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>
@@ -220,9 +226,15 @@ 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>
@@ -1079,4 +1091,21 @@ 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 color values are premultiplied by the alpha channel
+value. For example, if a light blue pixel with 50% transparency was described by
+RGBA values (128, 192, 255, 128), the same pixel described with premultiplied
+colors would be described by RGBA values (64, 96, 128, 128) </entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
</section>
diff --git a/Documentation/DocBook/media/v4l/v4l2.xml b/Documentation/DocBook/media/v4l/v4l2.xml
index d0a48bebfa52..f2f81f06a17b 100644
--- a/Documentation/DocBook/media/v4l/v4l2.xml
+++ b/Documentation/DocBook/media/v4l/v4l2.xml
@@ -155,7 +155,7 @@ applications. -->
<revnumber>3.16</revnumber>
<date>2014-05-27</date>
<authorinitials>lp</authorinitials>
- <revremark>Extended &v4l2-pix-format;.
+ <revremark>Extended &v4l2-pix-format;. Added format flags.
</revremark>
</revision>