<refentry id="packed-rgb">
  <refmeta>
    <refentrytitle>Packed RGB formats</refentrytitle>
    &manvol;
  </refmeta>
  <refnamediv>
    <refname>Packed RGB formats</refname>
    <refpurpose>Packed RGB formats</refpurpose>
  </refnamediv>
  <refsect1>
    <title>Description</title>

    <para>These formats are designed to match the pixel formats of
typical PC graphics frame buffers. They occupy 8, 16, 24 or 32 bits
per pixel. These are all packed-pixel formats, meaning all the data
for a pixel lie next to each other in memory.</para>

    <table pgwide="1" frame="none" id="rgb-formats">
      <title>Packed RGB Image Formats</title>
      <tgroup cols="37" align="center">
	<colspec colname="id" align="left" />
	<colspec colname="fourcc" />
	<colspec colname="bit" />

	<colspec colnum="4" colname="b07" align="center" />
	<colspec colnum="5" colname="b06" align="center" />
	<colspec colnum="6" colname="b05" align="center" />
	<colspec colnum="7" colname="b04" align="center" />
	<colspec colnum="8" colname="b03" align="center" />
	<colspec colnum="9" colname="b02" align="center" />
	<colspec colnum="10" colname="b01" align="center" />
	<colspec colnum="11" colname="b00" align="center" />

	<colspec colnum="13" colname="b17" align="center" />
	<colspec colnum="14" colname="b16" align="center" />
	<colspec colnum="15" colname="b15" align="center" />
	<colspec colnum="16" colname="b14" align="center" />
	<colspec colnum="17" colname="b13" align="center" />
	<colspec colnum="18" colname="b12" align="center" />
	<colspec colnum="19" colname="b11" align="center" />
	<colspec colnum="20" colname="b10" align="center" />

	<colspec colnum="22" colname="b27" align="center" />
	<colspec colnum="23" colname="b26" align="center" />
	<colspec colnum="24" colname="b25" align="center" />
	<colspec colnum="25" colname="b24" align="center" />
	<colspec colnum="26" colname="b23" align="center" />
	<colspec colnum="27" colname="b22" align="center" />
	<colspec colnum="28" colname="b21" align="center" />
	<colspec colnum="29" colname="b20" align="center" />

	<colspec colnum="31" colname="b37" align="center" />
	<colspec colnum="32" colname="b36" align="center" />
	<colspec colnum="33" colname="b35" align="center" />
	<colspec colnum="34" colname="b34" align="center" />
	<colspec colnum="35" colname="b33" align="center" />
	<colspec colnum="36" colname="b32" align="center" />
	<colspec colnum="37" colname="b31" align="center" />
	<colspec colnum="38" colname="b30" align="center" />

	<spanspec namest="b07" nameend="b00" spanname="b0" />
	<spanspec namest="b17" nameend="b10" spanname="b1" />
	<spanspec namest="b27" nameend="b20" spanname="b2" />
	<spanspec namest="b37" nameend="b30" spanname="b3" />
	<thead>
	  <row>
	    <entry>Identifier</entry>
	    <entry>Code</entry>
	    <entry>&nbsp;</entry>
	    <entry spanname="b0">Byte&nbsp;0 in memory</entry>
	    <entry spanname="b1">Byte&nbsp;1</entry>
	    <entry spanname="b2">Byte&nbsp;2</entry>
	    <entry spanname="b3">Byte&nbsp;3</entry>
	  </row>
	  <row>
	    <entry>&nbsp;</entry>
	    <entry>&nbsp;</entry>
	    <entry>Bit</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	    <entry>&nbsp;</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	    <entry>&nbsp;</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	    <entry>&nbsp;</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row id="V4L2-PIX-FMT-RGB332">
	    <entry><constant>V4L2_PIX_FMT_RGB332</constant></entry>
	    <entry>'RGB1'</entry>
	    <entry></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-ARGB444">
	    <entry><constant>V4L2_PIX_FMT_ARGB444</constant></entry>
	    <entry>'AR12'</entry>
	    <entry></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>a<subscript>3</subscript></entry>
	    <entry>a<subscript>2</subscript></entry>
	    <entry>a<subscript>1</subscript></entry>
	    <entry>a<subscript>0</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-XRGB444">
	    <entry><constant>V4L2_PIX_FMT_XRGB444</constant></entry>
	    <entry>'XR12'</entry>
	    <entry></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-ARGB555">
	    <entry><constant>V4L2_PIX_FMT_ARGB555</constant></entry>
	    <entry>'AR15'</entry>
	    <entry></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>a</entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-XRGB555">
	    <entry><constant>V4L2_PIX_FMT_XRGB555</constant></entry>
	    <entry>'XR15'</entry>
	    <entry></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>-</entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-RGB565">
	    <entry><constant>V4L2_PIX_FMT_RGB565</constant></entry>
	    <entry>'RGBP'</entry>
	    <entry></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-RGB555X">
	    <entry><constant>V4L2_PIX_FMT_RGB555X</constant></entry>
	    <entry>'RGBQ'</entry>
	    <entry></entry>
	    <entry>a</entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-RGB565X">
	    <entry><constant>V4L2_PIX_FMT_RGB565X</constant></entry>
	    <entry>'RGBR'</entry>
	    <entry></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-BGR666">
	    <entry><constant>V4L2_PIX_FMT_BGR666</constant></entry>
	    <entry>'BGRH'</entry>
	    <entry></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	    <entry></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-BGR24">
	    <entry><constant>V4L2_PIX_FMT_BGR24</constant></entry>
	    <entry>'BGR3'</entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-RGB24">
	    <entry><constant>V4L2_PIX_FMT_RGB24</constant></entry>
	    <entry>'RGB3'</entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-ABGR32">
	    <entry><constant>V4L2_PIX_FMT_ABGR32</constant></entry>
	    <entry>'AR24'</entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>a<subscript>7</subscript></entry>
	    <entry>a<subscript>6</subscript></entry>
	    <entry>a<subscript>5</subscript></entry>
	    <entry>a<subscript>4</subscript></entry>
	    <entry>a<subscript>3</subscript></entry>
	    <entry>a<subscript>2</subscript></entry>
	    <entry>a<subscript>1</subscript></entry>
	    <entry>a<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-XBGR32">
	    <entry><constant>V4L2_PIX_FMT_XBGR32</constant></entry>
	    <entry>'XR24'</entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	  </row>
	  <row id="V4L2-PIX-FMT-ARGB32">
	    <entry><constant>V4L2_PIX_FMT_ARGB32</constant></entry>
	    <entry>'AX24'</entry>
	    <entry></entry>
	    <entry>a<subscript>7</subscript></entry>
	    <entry>a<subscript>6</subscript></entry>
	    <entry>a<subscript>5</subscript></entry>
	    <entry>a<subscript>4</subscript></entry>
	    <entry>a<subscript>3</subscript></entry>
	    <entry>a<subscript>2</subscript></entry>
	    <entry>a<subscript>1</subscript></entry>
	    <entry>a<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-XRGB32">
	    <entry><constant>V4L2_PIX_FMT_XRGB32</constant></entry>
	    <entry>'BX24'</entry>
	    <entry></entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry>-</entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	  </row>
	</tbody>
      </tgroup>
    </table>

    <para>Bit 7 is the most significant bit.</para>

    <para>The usage and value of the alpha bits (a) in the ARGB and ABGR formats
    (collectively referred to as alpha formats) depend on the device type and
    hardware operation. <link linkend="capture">Capture</link> devices
    (including capture queues of mem-to-mem devices) fill the alpha component in
    memory. When the device outputs an alpha channel the alpha component will
    have a meaningful value. Otherwise, when the device doesn't output an alpha
    channel but can set the alpha bit to a user-configurable value, the <link
    linkend="v4l2-alpha-component"><constant>V4L2_CID_ALPHA_COMPONENT</constant>
    </link> control is used to specify that alpha value, and the alpha component
    of all pixels will be set to the value specified by that control. Otherwise
    a corresponding format without an alpha component (XRGB or XBGR) must be
    used instead of an alpha format.</para>

    <para><link linkend="output">Output</link> devices (including output queues
    of mem-to-mem devices and <link linkend="osd">video output overlay</link>
    devices) read the alpha component from memory. When the device processes the
    alpha channel the alpha component must be filled with meaningful values by
    applications. Otherwise a corresponding format without an alpha component
    (XRGB or XBGR) must be used instead of an alpha format.</para>

    <para>The XRGB and XBGR formats contain undefined bits (-). Applications,
    devices and drivers must ignore those bits, for both <link
    linkend="capture">capture</link> and <link linkend="output">output</link>
    devices.</para>

    <example>
      <title><constant>V4L2_PIX_FMT_BGR24</constant> 4 &times; 4 pixel
image</title>

      <formalpara>
	<title>Byte Order.</title>
	<para>Each cell is one byte.
	      <informaltable frame="none">
	    <tgroup cols="13" align="center">
	      <colspec align="left" colwidth="2*" />
	      <tbody valign="top">
		<row>
		  <entry>start&nbsp;+&nbsp;0:</entry>
		  <entry>B<subscript>00</subscript></entry>
		  <entry>G<subscript>00</subscript></entry>
		  <entry>R<subscript>00</subscript></entry>
		  <entry>B<subscript>01</subscript></entry>
		  <entry>G<subscript>01</subscript></entry>
		  <entry>R<subscript>01</subscript></entry>
		  <entry>B<subscript>02</subscript></entry>
		  <entry>G<subscript>02</subscript></entry>
		  <entry>R<subscript>02</subscript></entry>
		  <entry>B<subscript>03</subscript></entry>
		  <entry>G<subscript>03</subscript></entry>
		  <entry>R<subscript>03</subscript></entry>
		</row>
		<row>
		  <entry>start&nbsp;+&nbsp;12:</entry>
		  <entry>B<subscript>10</subscript></entry>
		  <entry>G<subscript>10</subscript></entry>
		  <entry>R<subscript>10</subscript></entry>
		  <entry>B<subscript>11</subscript></entry>
		  <entry>G<subscript>11</subscript></entry>
		  <entry>R<subscript>11</subscript></entry>
		  <entry>B<subscript>12</subscript></entry>
		  <entry>G<subscript>12</subscript></entry>
		  <entry>R<subscript>12</subscript></entry>
		  <entry>B<subscript>13</subscript></entry>
		  <entry>G<subscript>13</subscript></entry>
		  <entry>R<subscript>13</subscript></entry>
		</row>
		<row>
		  <entry>start&nbsp;+&nbsp;24:</entry>
		  <entry>B<subscript>20</subscript></entry>
		  <entry>G<subscript>20</subscript></entry>
		  <entry>R<subscript>20</subscript></entry>
		  <entry>B<subscript>21</subscript></entry>
		  <entry>G<subscript>21</subscript></entry>
		  <entry>R<subscript>21</subscript></entry>
		  <entry>B<subscript>22</subscript></entry>
		  <entry>G<subscript>22</subscript></entry>
		  <entry>R<subscript>22</subscript></entry>
		  <entry>B<subscript>23</subscript></entry>
		  <entry>G<subscript>23</subscript></entry>
		  <entry>R<subscript>23</subscript></entry>
		</row>
		<row>
		  <entry>start&nbsp;+&nbsp;36:</entry>
		  <entry>B<subscript>30</subscript></entry>
		  <entry>G<subscript>30</subscript></entry>
		  <entry>R<subscript>30</subscript></entry>
		  <entry>B<subscript>31</subscript></entry>
		  <entry>G<subscript>31</subscript></entry>
		  <entry>R<subscript>31</subscript></entry>
		  <entry>B<subscript>32</subscript></entry>
		  <entry>G<subscript>32</subscript></entry>
		  <entry>R<subscript>32</subscript></entry>
		  <entry>B<subscript>33</subscript></entry>
		  <entry>G<subscript>33</subscript></entry>
		  <entry>R<subscript>33</subscript></entry>
		</row>
	      </tbody>
	    </tgroup>
	      </informaltable>
	    </para>
      </formalpara>
    </example>

    <para>Formats defined in <xref linkend="rgb-formats-deprecated"/> are
    deprecated and must not be used by new drivers. They are documented here for
    reference. The meaning of their alpha bits (a) is ill-defined and
    interpreted as in either the corresponding ARGB or XRGB format, depending on
    the driver.</para>

    <table pgwide="1" frame="none" id="rgb-formats-deprecated">
      <title>Deprecated Packed RGB Image Formats</title>
      <tgroup cols="37" align="center">
	<colspec colname="id" align="left" />
	<colspec colname="fourcc" />
	<colspec colname="bit" />

	<colspec colnum="4" colname="b07" align="center" />
	<colspec colnum="5" colname="b06" align="center" />
	<colspec colnum="6" colname="b05" align="center" />
	<colspec colnum="7" colname="b04" align="center" />
	<colspec colnum="8" colname="b03" align="center" />
	<colspec colnum="9" colname="b02" align="center" />
	<colspec colnum="10" colname="b01" align="center" />
	<colspec colnum="11" colname="b00" align="center" />

	<colspec colnum="13" colname="b17" align="center" />
	<colspec colnum="14" colname="b16" align="center" />
	<colspec colnum="15" colname="b15" align="center" />
	<colspec colnum="16" colname="b14" align="center" />
	<colspec colnum="17" colname="b13" align="center" />
	<colspec colnum="18" colname="b12" align="center" />
	<colspec colnum="19" colname="b11" align="center" />
	<colspec colnum="20" colname="b10" align="center" />

	<colspec colnum="22" colname="b27" align="center" />
	<colspec colnum="23" colname="b26" align="center" />
	<colspec colnum="24" colname="b25" align="center" />
	<colspec colnum="25" colname="b24" align="center" />
	<colspec colnum="26" colname="b23" align="center" />
	<colspec colnum="27" colname="b22" align="center" />
	<colspec colnum="28" colname="b21" align="center" />
	<colspec colnum="29" colname="b20" align="center" />

	<colspec colnum="31" colname="b37" align="center" />
	<colspec colnum="32" colname="b36" align="center" />
	<colspec colnum="33" colname="b35" align="center" />
	<colspec colnum="34" colname="b34" align="center" />
	<colspec colnum="35" colname="b33" align="center" />
	<colspec colnum="36" colname="b32" align="center" />
	<colspec colnum="37" colname="b31" align="center" />
	<colspec colnum="38" colname="b30" align="center" />

	<spanspec namest="b07" nameend="b00" spanname="b0" />
	<spanspec namest="b17" nameend="b10" spanname="b1" />
	<spanspec namest="b27" nameend="b20" spanname="b2" />
	<spanspec namest="b37" nameend="b30" spanname="b3" />
	<thead>
	  <row>
	    <entry>Identifier</entry>
	    <entry>Code</entry>
	    <entry>&nbsp;</entry>
	    <entry spanname="b0">Byte&nbsp;0 in memory</entry>
	    <entry spanname="b1">Byte&nbsp;1</entry>
	    <entry spanname="b2">Byte&nbsp;2</entry>
	    <entry spanname="b3">Byte&nbsp;3</entry>
	  </row>
	  <row>
	    <entry>&nbsp;</entry>
	    <entry>&nbsp;</entry>
	    <entry>Bit</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	    <entry>&nbsp;</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	    <entry>&nbsp;</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	    <entry>&nbsp;</entry>
	    <entry>7</entry>
	    <entry>6</entry>
	    <entry>5</entry>
	    <entry>4</entry>
	    <entry>3</entry>
	    <entry>2</entry>
	    <entry>1</entry>
	    <entry>0</entry>
	  </row>
	</thead>
	<tbody>
	  <row id="V4L2-PIX-FMT-RGB444">
	    <entry><constant>V4L2_PIX_FMT_RGB444</constant></entry>
	    <entry>'R444'</entry>
	    <entry></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>a<subscript>3</subscript></entry>
	    <entry>a<subscript>2</subscript></entry>
	    <entry>a<subscript>1</subscript></entry>
	    <entry>a<subscript>0</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-RGB555">
	    <entry><constant>V4L2_PIX_FMT_RGB555</constant></entry>
	    <entry>'RGBO'</entry>
	    <entry></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>a</entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-BGR32">
	    <entry><constant>V4L2_PIX_FMT_BGR32</constant></entry>
	    <entry>'BGR4'</entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>a<subscript>7</subscript></entry>
	    <entry>a<subscript>6</subscript></entry>
	    <entry>a<subscript>5</subscript></entry>
	    <entry>a<subscript>4</subscript></entry>
	    <entry>a<subscript>3</subscript></entry>
	    <entry>a<subscript>2</subscript></entry>
	    <entry>a<subscript>1</subscript></entry>
	    <entry>a<subscript>0</subscript></entry>
	  </row>
	  <row id="V4L2-PIX-FMT-RGB32">
	    <entry><constant>V4L2_PIX_FMT_RGB32</constant></entry>
	    <entry>'RGB4'</entry>
	    <entry></entry>
	    <entry>a<subscript>7</subscript></entry>
	    <entry>a<subscript>6</subscript></entry>
	    <entry>a<subscript>5</subscript></entry>
	    <entry>a<subscript>4</subscript></entry>
	    <entry>a<subscript>3</subscript></entry>
	    <entry>a<subscript>2</subscript></entry>
	    <entry>a<subscript>1</subscript></entry>
	    <entry>a<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>r<subscript>7</subscript></entry>
	    <entry>r<subscript>6</subscript></entry>
	    <entry>r<subscript>5</subscript></entry>
	    <entry>r<subscript>4</subscript></entry>
	    <entry>r<subscript>3</subscript></entry>
	    <entry>r<subscript>2</subscript></entry>
	    <entry>r<subscript>1</subscript></entry>
	    <entry>r<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>g<subscript>7</subscript></entry>
	    <entry>g<subscript>6</subscript></entry>
	    <entry>g<subscript>5</subscript></entry>
	    <entry>g<subscript>4</subscript></entry>
	    <entry>g<subscript>3</subscript></entry>
	    <entry>g<subscript>2</subscript></entry>
	    <entry>g<subscript>1</subscript></entry>
	    <entry>g<subscript>0</subscript></entry>
	    <entry></entry>
	    <entry>b<subscript>7</subscript></entry>
	    <entry>b<subscript>6</subscript></entry>
	    <entry>b<subscript>5</subscript></entry>
	    <entry>b<subscript>4</subscript></entry>
	    <entry>b<subscript>3</subscript></entry>
	    <entry>b<subscript>2</subscript></entry>
	    <entry>b<subscript>1</subscript></entry>
	    <entry>b<subscript>0</subscript></entry>
	  </row>
	</tbody>
      </tgroup>
    </table>

    <para>A test utility to determine which RGB formats a driver
actually supports is available from the LinuxTV v4l-dvb repository.
See &v4l-dvb; for access instructions.</para>

  </refsect1>
    </refentry>
