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media: v4l2-common.h: document helper functions

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There are several helper functions that aren't documented.

Document them.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-09-22 09:03:54 -04:00
parent 0545629e50
commit 76a59fe770
2 changed files with 96 additions and 25 deletions
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14
drivers/media/v4l2-core/v4l2-common.c
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@ -320,20 +320,6 @@ static unsigned int clamp_align(unsigned int x, unsigned int min,
return x;
}
/* Bound an image to have a width between wmin and wmax, and height between
* hmin and hmax, inclusive. Additionally, the width will be a multiple of
* 2^walign, the height will be a multiple of 2^halign, and the overall size
* (width*height) will be a multiple of 2^salign. The image may be shrunk
* or enlarged to fit the alignment constraints.
*
* The width or height maximum must not be smaller than the corresponding
* minimum. The alignments must not be so high there are no possible image
* sizes within the allowed bounds. wmin and hmin must be at least 1
* (don't use 0). If you don't care about a certain alignment, specify 0,
* as 2^0 is 1 and one byte alignment is equivalent to no alignment. If
* you only want to adjust downward, specify a maximum that's the same as
* the initial value.
*/
void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
unsigned int walign,
u32 *h, unsigned int hmin, unsigned int hmax,