bitmap_remap(9) [centos man page]

BITMAP_REMAP(9) 					  Basic Kernel Library Functions					   BITMAP_REMAP(9)

NAME

       bitmap_remap - Apply map defined by a pair of bitmaps to another bitmap

SYNOPSIS

       void bitmap_remap(unsigned long * dst, const unsigned long * src, const unsigned long * old, const unsigned long * new, int bits);

ARGUMENTS

       dst
	   remapped result

       src
	   subset to be remapped

       old
	   defines domain of map

       new
	   defines range of map

       bits
	   number of bits in each of these bitmaps

DESCRIPTION

       Let old and new define a mapping of bit positions, such that whatever position is held by the n-th set bit in old is mapped to the n-th set
       bit in new. In the more general case, allowing for the possibility that the weight 'w' of new is less than the weight of old, map the
       position of the n-th set bit in old to the position of the m-th set bit in new, where m == n % w.

       If either of the old and new bitmaps are empty, or if src and dst point to the same location, then this routine copies src to dst.

       The positions of unset bits in old are mapped to themselves (the identify map).

       Apply the above specified mapping to src, placing the result in dst, clearing any bits previously set in dst.

       For example, lets say that old has bits 4 through 7 set, and new has bits 12 through 15 set. This defines the mapping of bit position 4 to
       12, 5 to 13, 6 to 14 and 7 to 15, and of all other bit positions unchanged. So if say src comes into this routine with bits 1, 5 and 7 set,
       then dst should leave with bits 1, 13 and 15 set.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							   BITMAP_REMAP(9)

mlib_ImageDivAlpha(3MLIB)				    mediaLib Library Functions					 mlib_ImageDivAlpha(3MLIB)

NAME

       mlib_ImageDivAlpha - alpha channel division

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_ImageDivAlpha(mlib_image *dst, const mlib_image *src, mlib_s32 cmask);

DESCRIPTION

       The mlib_ImageDivAlpha() function divides color channels by the alpha channel on a pixel-by-pixel basis.

       For the MLIB_BYTE image, it uses the following equation:

       dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-8))

       For the MLIB_SHORT image, it uses the following equation:

       dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-15))

       For the MLIB_USHORT image, it uses the following equation:

       dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-16))

       For the MLIB_INT image, it uses the following equation:

       dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-31))

       where c and a are the indices for the color channels and the alpha channel, respectively, so c != a.

       In the case of src[x][y][a] = 0,

       dst[x][y][c] = 0 	     if src[x][y][c] = 0
       dst[x][y][c] = DATA_TYPE_MAX  if src[x][y][c] > 0
       dst[x][y][c] = DATA_TYPE_MIN  if src[x][y][c] < 0

       where  DATA_TYPE  is MLIB_U8, MLIB_S16, MLIB_U16, or MLIB_S32 for an image of type MLIB_BYTE, MLIB_SHORT, MLIB_USHORT, or MLIB_INT, respec-
       tively.

PARAMETERS

       The function takes the following arguments:

       dst	       Pointer to destination image.

       src	       Pointer to source image.

       cmask	       Channel mask to indicate the alpha channel. Each bit of the mask represents a channel in the image. The channel correspond-
		       ing to the 1 bit of cmask is the alpha channel.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageDivAlpha_Inp(3MLIB), mlib_ImageDivAlpha_Fp(3MLIB), mlib_ImageDivAlpha_Fp_Inp(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 					 mlib_ImageDivAlpha(3MLIB)