video: Extended vivi pixel format support

Extended vivi pixel format support

[PATCH 01/05] video: Precalculate vivi yuv values [PATCH 02/05] video: Teach vivi about multiple pixel formats [PATCH 03/05] video: Add uyvy pixel format support to vivi [PATCH 04/05] video: Add support for rgb565 pixel formats to vivi [PATCH 05/05] video: Add support for rgb555 pixel formats to vivi

These patches improve the RGB->YUV color space conversion code in vivi.c and also add support for the following pixel formats:

V4L2_PIX_FMT_UYVY
V4L2_PIX_FMT_RGB565 /* gggbbbbb rrrrrggg */
V4L2_PIX_FMT_RGB565X /* rrrrrggg gggbbbbb */
V4L2_PIX_FMT_RGB555 /* gggbbbbb arrrrrgg */
V4L2_PIX_FMT_RGB555X /* arrrrrgg gggbbbbb */

With these patches the vivi driver can be used as a reference for testing the byte order of 16-bit pixel formats. This allows testing of user space software without actual capture hardware. It is also useful for people who are developing new drivers and have doubts which 16-bit RGB interpretation is the valid one (RGB vs BGR).

The color space conversion code is updated to use precalculated YUV values instead of doing RGB->YUV calculation for every two pixels.

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 drivers/media/video/vivi.c |  314 +++++++++++++++++++++++++++++++-------------
 1 file changed, 225 insertions(+), 89 deletions(-)

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