[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>
This commit is contained in:
Laurent Pinchart
Mauro Carvalho Chehab
Родитель
d52e238136
Коммит
c96fd46afb
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@ -135,6 +135,12 @@ extended fields were set to zero. On return drivers must set the
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<constant>V4L2_PIX_FMT_PRIV_MAGIC</constant> and all the extended fields to
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applicable values.</para></entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>flags</structfield></entry>
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<entry>Flags set by the application or driver, see <xref
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linkend="format-flags" />.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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@ -220,9 +226,15 @@ codes can be used.</entry>
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and the number of valid entries in the
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<structfield>plane_fmt</structfield> array.</entry>
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</row>
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<row>
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<entry>__u8</entry>
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<entry><structfield>flags</structfield></entry>
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<entry>Flags set by the application or driver, see <xref
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linkend="format-flags" />.</entry>
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</row>
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<row>
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<entry>__u8</entry>
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<entry><structfield>reserved[11]</structfield></entry>
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<entry><structfield>reserved[10]</structfield></entry>
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<entry>Reserved for future extensions. Should be zeroed by the
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application.</entry>
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</row>
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@ -1079,4 +1091,21 @@ concatenated to form the JPEG stream. </para>
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</tbody>
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</tgroup>
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</table>
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<table frame="none" pgwide="1" id="format-flags">
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<title>Format Flags</title>
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<tgroup cols="3">
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&cs-def;
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_PIX_FMT_FLAG_PREMUL_ALPHA</constant></entry>
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<entry>0x00000001</entry>
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<entry>The color values are premultiplied by the alpha channel
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value. For example, if a light blue pixel with 50% transparency was described by
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RGBA values (128, 192, 255, 128), the same pixel described with premultiplied
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colors would be described by RGBA values (64, 96, 128, 128) </entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</section>
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@ -155,7 +155,7 @@ applications. -->
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<revnumber>3.16</revnumber>
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<date>2014-05-27</date>
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<authorinitials>lp</authorinitials>
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<revremark>Extended &v4l2-pix-format;.
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<revremark>Extended &v4l2-pix-format;. Added format flags.
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</revremark>
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</revision>
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@ -256,7 +256,8 @@ static void v4l_print_format(const void *arg, bool write_only)
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pix = &p->fmt.pix;
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pr_cont(", width=%u, height=%u, "
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"pixelformat=%c%c%c%c, field=%s, "
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"bytesperline=%u, sizeimage=%u, colorspace=%d\n",
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"bytesperline=%u, sizeimage=%u, colorspace=%d, "
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"flags %u\n",
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pix->width, pix->height,
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(pix->pixelformat & 0xff),
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(pix->pixelformat >> 8) & 0xff,
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@ -264,7 +265,7 @@ static void v4l_print_format(const void *arg, bool write_only)
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(pix->pixelformat >> 24) & 0xff,
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prt_names(pix->field, v4l2_field_names),
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pix->bytesperline, pix->sizeimage,
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pix->colorspace);
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pix->colorspace, pix->flags);
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break;
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case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
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case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
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@ -288,6 +288,7 @@ struct v4l2_pix_format {
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__u32 sizeimage;
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__u32 colorspace; /* enum v4l2_colorspace */
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__u32 priv; /* private data, depends on pixelformat */
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__u32 flags; /* format flags (V4L2_PIX_FMT_FLAG_*) */
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};
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/* Pixel format FOURCC depth Description */
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@ -452,6 +453,9 @@ struct v4l2_pix_format {
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/* priv field value to indicates that subsequent fields are valid. */
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#define V4L2_PIX_FMT_PRIV_MAGIC 0xfeedcafe
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/* Flags */
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#define V4L2_PIX_FMT_FLAG_PREMUL_ALPHA 0x00000001
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/*
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* F O R M A T E N U M E R A T I O N
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*/
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@ -1754,6 +1758,7 @@ struct v4l2_plane_pix_format {
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* @colorspace: enum v4l2_colorspace; supplemental to pixelformat
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* @plane_fmt: per-plane information
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* @num_planes: number of planes for this format
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* @flags: format flags (V4L2_PIX_FMT_FLAG_*)
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*/
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struct v4l2_pix_format_mplane {
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__u32 width;
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@ -1764,7 +1769,8 @@ struct v4l2_pix_format_mplane {
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struct v4l2_plane_pix_format plane_fmt[VIDEO_MAX_PLANES];
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__u8 num_planes;
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__u8 reserved[11];
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__u8 flags;
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__u8 reserved[10];
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} __attribute__ ((packed));
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/**
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