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media: tpg: Add function to return colors' order of test image
Currently there is no method to know the correct order of the colors for a test image generated by tpg. Write a function that returns a string of colors' order given a tpg. It returns a NULL pointer in case of test patterns which do not have a well defined colors' order. Hence add a NULL check for text in tpg_gen_text(). [hverkuil: white -> White (for consistency)] Signed-off-by: Kaaira Gupta <[email protected]> Reviewed-by: Kieran Bingham <[email protected]> Reviewed-by: Helen Koike <[email protected]> Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
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