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Diffstat (limited to 'Documentation/userspace-api/media/v4l/pixfmt-rgb.rst')
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1 files changed, 185 insertions, 486 deletions
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst b/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst index 9d827097c1d9..897676ee2c9d 100644 --- a/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst +++ b/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst @@ -6,13 +6,62 @@ RGB Formats *********** -Description -=========== - -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. +These formats encode each pixel as a triplet of RGB values. They are packed +formats, meaning that the RGB values for one pixel are stored consecutively in +memory and each pixel consumes an integer number of bytes. When the number of +bits required to store a pixel is not aligned to a byte boundary, the data is +padded with additional bits to fill the remaining byte. + +The formats differ by the number of bits per RGB component (typically but not +always the same for all components), the order of components in memory, and the +presence of an alpha component or additional padding bits. + +The usage and value of the alpha bits in formats that support them (named ARGB +or a permutation thereof, collectively referred to as alpha formats) depend on +the device type and hardware operation. :ref:`Capture <capture>` devices +(including capture queues of mem-to-mem devices) fill the alpha component in +memory. When the device captures an alpha channel the alpha component will have +a meaningful value. Otherwise, when the device doesn't capture an alpha channel +but can set the alpha bit to a user-configurable value, the +:ref:`V4L2_CID_ALPHA_COMPONENT <v4l2-alpha-component>` 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. + +:ref:`Output <output>` devices (including output queues of mem-to-mem devices +and :ref:`video output overlay <osd>` 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. + +Formats that contain padding bits are named XRGB (or a permutation thereof). +The padding bits contain undefined values and must be ignored by applications, +devices and drivers, for both :ref:`capture` and :ref:`output` devices. + +.. note:: + + - In all the tables that follow, bit 7 is the most significant bit in a byte. + - 'r', 'g' and 'b' denote bits of the red, green and blue components + respectively. 'a' denotes bits of the alpha component (if supported by the + format), and 'x' denotes padding bits. + + +Less Than 8 Bits Per Component +============================== + +These formats store an RGB triplet in one, two or four bytes. They are named +based on the order of the RGB components as seen in a 8-, 16- or 32-bit word, +which is then stored in memory in little endian byte order (unless otherwise +noted by the presence of bit 31 in the 4CC value), and on the number of bits +for each component. For instance, the RGB565 format stores a pixel in a 16-bit +word [15:0] laid out at as [R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1` +R\ :sub:`0` G\ :sub:`5` G\ :sub:`4` G\ :sub:`3` G\ :sub:`2` G\ :sub:`1` +G\ :sub:`0` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2` B\ :sub:`1` B\ :sub:`0`], and +stored in memory in two bytes, [R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1` +R\ :sub:`0` G\ :sub:`5` G\ :sub:`4` G\ :sub:`3`] followed by [G\ :sub:`2` +G\ :sub:`1` G\ :sub:`0` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2` B\ :sub:`1` +B\ :sub:`0`]. .. raw:: latex @@ -23,7 +72,7 @@ next to each other in memory. .. tabularcolumns:: |p{2.8cm}|p{2.0cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}| -.. flat-table:: RGB Image Formats +.. flat-table:: RGB Formats With Less Than 8 Bits Per Component :header-rows: 2 :stub-columns: 0 @@ -121,10 +170,10 @@ next to each other in memory. - b\ :sub:`1` - b\ :sub:`0` - - `-` - - `-` - - `-` - - `-` + - x + - x + - x + - x - r\ :sub:`3` - r\ :sub:`2` - r\ :sub:`1` @@ -162,10 +211,10 @@ next to each other in memory. - b\ :sub:`2` - b\ :sub:`1` - b\ :sub:`0` - - `-` - - `-` - - `-` - - `-` + - x + - x + - x + - x - r\ :sub:`3` - r\ :sub:`2` @@ -213,10 +262,10 @@ next to each other in memory. - r\ :sub:`1` - r\ :sub:`0` - - `-` - - `-` - - `-` - - `-` + - x + - x + - x + - x - b\ :sub:`3` - b\ :sub:`2` - b\ :sub:`1` @@ -254,10 +303,10 @@ next to each other in memory. - r\ :sub:`2` - r\ :sub:`1` - r\ :sub:`0` - - `-` - - `-` - - `-` - - `-` + - x + - x + - x + - x - b\ :sub:`3` - b\ :sub:`2` @@ -305,7 +354,7 @@ next to each other in memory. - b\ :sub:`1` - b\ :sub:`0` - - `-` + - x - r\ :sub:`4` - r\ :sub:`3` - r\ :sub:`2` @@ -349,7 +398,7 @@ next to each other in memory. - b\ :sub:`2` - b\ :sub:`1` - b\ :sub:`0` - - `-` + - x - r\ :sub:`4` - r\ :sub:`3` @@ -397,7 +446,7 @@ next to each other in memory. - r\ :sub:`1` - r\ :sub:`0` - - `-` + - x - b\ :sub:`4` - b\ :sub:`3` - b\ :sub:`2` @@ -441,7 +490,7 @@ next to each other in memory. - r\ :sub:`2` - r\ :sub:`1` - r\ :sub:`0` - - `-` + - x - b\ :sub:`4` - b\ :sub:`3` @@ -503,7 +552,7 @@ next to each other in memory. - ``V4L2_PIX_FMT_XRGB555X`` - 'XR15' | (1 << 31) - - `-` + - x - r\ :sub:`4` - r\ :sub:`3` - r\ :sub:`2` @@ -544,538 +593,188 @@ next to each other in memory. - b\ :sub:`1` - b\ :sub:`0` - - * .. _V4L2-PIX-FMT-BGR24: + * .. _V4L2-PIX-FMT-BGR666: - - ``V4L2_PIX_FMT_BGR24`` - - 'BGR3' + - ``V4L2_PIX_FMT_BGR666`` + - 'BGRH' - - b\ :sub:`7` - - b\ :sub:`6` - b\ :sub:`5` - b\ :sub:`4` - b\ :sub:`3` - b\ :sub:`2` - b\ :sub:`1` - b\ :sub:`0` - - - g\ :sub:`7` - - g\ :sub:`6` - g\ :sub:`5` - g\ :sub:`4` + - g\ :sub:`3` - g\ :sub:`2` - g\ :sub:`1` - g\ :sub:`0` - - - r\ :sub:`7` - - r\ :sub:`6` - r\ :sub:`5` - r\ :sub:`4` - r\ :sub:`3` - r\ :sub:`2` + - r\ :sub:`1` - r\ :sub:`0` - - - * .. _V4L2-PIX-FMT-RGB24: + - x + - x + - x + - x + - x + - x - - ``V4L2_PIX_FMT_RGB24`` - - 'RGB3' + - x + - x + - x + - x + - x + - x + - x + - x - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` +.. raw:: latex - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` + \endgroup - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` - - - * .. _V4L2-PIX-FMT-BGR666: - - ``V4L2_PIX_FMT_BGR666`` - - 'BGRH' +8 Bits Per Component +==================== - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` - - g\ :sub:`5` - - g\ :sub:`4` +These formats store an RGB triplet in three or four bytes. They are named based +on the order of the RGB components as stored in memory, and on the total number +of bits per pixel. For instance, RGB24 format stores a pixel with [R\ :sub:`7` +R\ :sub:`6` R\ :sub:`5` R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1` +R\ :sub:`0`] in the first byte, [G\ :sub:`7` G\ :sub:`6` G\ :sub:`5` G\ :sub:`4` +G\ :sub:`3` G\ :sub:`2` G\ :sub:`1` G\ :sub:`0`] in the second byte and +[B\ :sub:`7` B\ :sub:`6` B\ :sub:`5` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2` +B\ :sub:`1` B\ :sub:`0`] in the third byte. This differs from the DRM format +nomenclature that instead use the order of components as seen in a 24- or +32-bit little endian word. - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` +.. raw:: latex - - r\ :sub:`1` - - r\ :sub:`0` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - * .. _V4L2-PIX-FMT-ABGR32: + \begingroup + \tiny + \setlength{\tabcolsep}{2pt} - - ``V4L2_PIX_FMT_ABGR32`` - - 'AR24' +.. tabularcolumns:: |p{2.8cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}| - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` +.. flat-table:: RGB Formats With 8 Bits Per Component + :header-rows: 1 + :stub-columns: 0 - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` + * - Identifier + - Code + - Byte 0 in memory + - Byte 1 + - Byte 2 + - Byte 3 + * .. _V4L2-PIX-FMT-BGR24: - - a\ :sub:`7` - - a\ :sub:`6` - - a\ :sub:`5` - - a\ :sub:`4` - - a\ :sub:`3` - - a\ :sub:`2` - - a\ :sub:`1` - - a\ :sub:`0` - * .. _V4L2-PIX-FMT-XBGR32: + - ``V4L2_PIX_FMT_BGR24`` + - 'BGR3' - - ``V4L2_PIX_FMT_XBGR32`` - - 'XR24' + - G\ :sub:`7-0` + - B\ :sub:`7-0` + - R\ :sub:`7-0` + - + * .. _V4L2-PIX-FMT-RGB24: - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` + - ``V4L2_PIX_FMT_RGB24`` + - 'RGB3' - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` + - R\ :sub:`7-0` + - G\ :sub:`7-0` + - B\ :sub:`7-0` + - + * .. _V4L2-PIX-FMT-ABGR32: - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` + - ``V4L2_PIX_FMT_ABGR32`` + - 'AR24' - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` + - B\ :sub:`7-0` + - G\ :sub:`7-0` + - R\ :sub:`7-0` + - A\ :sub:`7-0` + * .. _V4L2-PIX-FMT-XBGR32: + + - ``V4L2_PIX_FMT_XBGR32`` + - 'XR24' + + - B\ :sub:`7-0` + - G\ :sub:`7-0` + - R\ :sub:`7-0` + - X\ :sub:`7-0` * .. _V4L2-PIX-FMT-BGRA32: - ``V4L2_PIX_FMT_BGRA32`` - 'RA24' - - a\ :sub:`7` - - a\ :sub:`6` - - a\ :sub:`5` - - a\ :sub:`4` - - a\ :sub:`3` - - a\ :sub:`2` - - a\ :sub:`1` - - a\ :sub:`0` - - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` - - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` - - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` + - A\ :sub:`7-0` + - B\ :sub:`7-0` + - G\ :sub:`7-0` + - R\ :sub:`7-0` * .. _V4L2-PIX-FMT-BGRX32: - ``V4L2_PIX_FMT_BGRX32`` - 'RX24' - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` - - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` - - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` + - X\ :sub:`7-0` + - B\ :sub:`7-0` + - G\ :sub:`7-0` + - R\ :sub:`7-0` * .. _V4L2-PIX-FMT-RGBA32: - ``V4L2_PIX_FMT_RGBA32`` - 'AB24' - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` - - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` - - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` - - - a\ :sub:`7` - - a\ :sub:`6` - - a\ :sub:`5` - - a\ :sub:`4` - - a\ :sub:`3` - - a\ :sub:`2` - - a\ :sub:`1` - - a\ :sub:`0` + - R\ :sub:`7-0` + - G\ :sub:`7-0` + - B\ :sub:`7-0` + - A\ :sub:`7-0` * .. _V4L2-PIX-FMT-RGBX32: - ``V4L2_PIX_FMT_RGBX32`` - 'XB24' - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` - - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` - - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` - - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` + - R\ :sub:`7-0` + - G\ :sub:`7-0` + - B\ :sub:`7-0` + - X\ :sub:`7-0` * .. _V4L2-PIX-FMT-ARGB32: - ``V4L2_PIX_FMT_ARGB32`` - 'BA24' - - a\ :sub:`7` - - a\ :sub:`6` - - a\ :sub:`5` - - a\ :sub:`4` - - a\ :sub:`3` - - a\ :sub:`2` - - a\ :sub:`1` - - a\ :sub:`0` - - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` - - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` - - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` + - A\ :sub:`7-0` + - R\ :sub:`7-0` + - G\ :sub:`7-0` + - B\ :sub:`7-0` * .. _V4L2-PIX-FMT-XRGB32: - ``V4L2_PIX_FMT_XRGB32`` - 'BX24' - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - `-` - - - r\ :sub:`7` - - r\ :sub:`6` - - r\ :sub:`5` - - r\ :sub:`4` - - r\ :sub:`3` - - r\ :sub:`2` - - r\ :sub:`1` - - r\ :sub:`0` - - - g\ :sub:`7` - - g\ :sub:`6` - - g\ :sub:`5` - - g\ :sub:`4` - - g\ :sub:`3` - - g\ :sub:`2` - - g\ :sub:`1` - - g\ :sub:`0` - - - b\ :sub:`7` - - b\ :sub:`6` - - b\ :sub:`5` - - b\ :sub:`4` - - b\ :sub:`3` - - b\ :sub:`2` - - b\ :sub:`1` - - b\ :sub:`0` + - X\ :sub:`7-0` + - R\ :sub:`7-0` + - G\ :sub:`7-0` + - B\ :sub:`7-0` .. raw:: latex \endgroup -.. note:: Bit 7 is the most significant bit. - -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. :ref:`Capture <capture>` 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 :ref:`V4L2_CID_ALPHA_COMPONENT <v4l2-alpha-component>` 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. - -:ref:`Output <output>` devices (including output queues of mem-to-mem -devices and :ref:`video output overlay <osd>` 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. - -The XRGB and XBGR formats contain undefined bits (-). Applications, -devices and drivers must ignore those bits, for both -:ref:`capture` and :ref:`output` devices. - -**Byte Order.** -Each cell is one byte. - - -.. raw:: latex - - \small - -.. tabularcolumns:: |p{3.1cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}| - -.. flat-table:: RGB byte order - :header-rows: 0 - :stub-columns: 0 - :widths: 11 3 3 3 3 3 3 3 3 3 3 3 3 - - * - start + 0: - - B\ :sub:`00` - - G\ :sub:`00` - - R\ :sub:`00` - - B\ :sub:`01` - - G\ :sub:`01` - - R\ :sub:`01` - - B\ :sub:`02` - - G\ :sub:`02` - - R\ :sub:`02` - - B\ :sub:`03` - - G\ :sub:`03` - - R\ :sub:`03` - * - start + 12: - - B\ :sub:`10` - - G\ :sub:`10` - - R\ :sub:`10` - - B\ :sub:`11` - - G\ :sub:`11` - - R\ :sub:`11` - - B\ :sub:`12` - - G\ :sub:`12` - - R\ :sub:`12` - - B\ :sub:`13` - - G\ :sub:`13` - - R\ :sub:`13` - * - start + 24: - - B\ :sub:`20` - - G\ :sub:`20` - - R\ :sub:`20` - - B\ :sub:`21` - - G\ :sub:`21` - - R\ :sub:`21` - - B\ :sub:`22` - - G\ :sub:`22` - - R\ :sub:`22` - - B\ :sub:`23` - - G\ :sub:`23` - - R\ :sub:`23` - * - start + 36: - - B\ :sub:`30` - - G\ :sub:`30` - - R\ :sub:`30` - - B\ :sub:`31` - - G\ :sub:`31` - - R\ :sub:`31` - - B\ :sub:`32` - - G\ :sub:`32` - - R\ :sub:`32` - - B\ :sub:`33` - - G\ :sub:`33` - - R\ :sub:`33` - -.. raw:: latex - - \normalsize -Formats defined in :ref:`pixfmt-rgb-deprecated` are deprecated and -must not be used by new drivers. They are documented here for reference. -The meaning of their alpha bits ``(a)`` are ill-defined and interpreted as in -either the corresponding ARGB or XRGB format, depending on the driver. +Deprecated RGB Formats +====================== +Formats defined in :ref:`pixfmt-rgb-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 they are interpreted as in either +the corresponding ARGB or XRGB format, depending on the driver. .. raw:: latex |