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| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2014-05-27 15:12:43 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-07-17 17:44:47 +0200 |
| commit | c96fd46afb34a554406bce9784126b96ad09091e (patch) | |
| tree | 41da27a48407bbd8d8c50d72221ea7f2ad232754 /Documentation/DocBook | |
| parent | [media] v4l: Support extending the v4l2_pix_format structure (diff) | |
| download | linux-c96fd46afb34a554406bce9784126b96ad09091e.tar.xz linux-c96fd46afb34a554406bce9784126b96ad09091e.zip | |
[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.xml | 31 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/v4l2.xml | 2 |
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> |