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mlib_imagedivalpha_fp(3mlib) [sunos man page]

mlib_ImageDivAlpha_Fp(3MLIB)				    mediaLib Library Functions				      mlib_ImageDivAlpha_Fp(3MLIB)

NAME
mlib_ImageDivAlpha_Fp - alpha channel division SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_ImageDivAlpha_Fp(mlib_image *dst, const mlib_image *src, mlib_s32 cmask); DESCRIPTION
The mlib_ImageDivAlpha_Fp() function divides floating-point color channels by the alpha channel on a pixel-by-pixel basis. It uses the following equation: dst[x][y][c] = src[x][y][c] / src[x][y][a] where c and a are the indices for the color channels and the alpha channel, respectively, so c != a. The operation follows the IEEE-754 standard. 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(3MLIB), mlib_ImageDivAlpha_Fp_Inp(3MLIB), mlib_ImageDivAlpha_Inp(3MLIB), attributes(5) SunOS 5.10 10 Nov 2004 mlib_ImageDivAlpha_Fp(3MLIB)

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mlib_ImageDivAlpha_Inp(3MLIB)				    mediaLib Library Functions				     mlib_ImageDivAlpha_Inp(3MLIB)

NAME
mlib_ImageDivAlpha_Inp - alpha channel division, in place SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_ImageDivAlpha_Inp(mlib_image *srcdst, mlib_s32 cmask); DESCRIPTION
The mlib_ImageDivAlpha_Inp() function divides color channels by the alpha channel on a pixel-by-pixel basis, in place. For the MLIB_BYTE image, it uses the following equation: srcdst[x][y][c] = srcdst[x][y][c] / (srcdst[x][y][a] * 2**(-8)) For the MLIB_SHORT image, it uses the following equation: srcdst[x][y][c] = srcdst[x][y][c] / (srcdst[x][y][a] * 2**(-15)) For the MLIB_USHORT image, it uses the following equation: srcdst[x][y][c] = srcdst[x][y][c] / (srcdst[x][y][a] * 2**(-16)) For the MLIB_INT image, it uses the following equation: srcdst[x][y][c] = srcdst[x][y][c] / (srcdst[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 srcdst[x][y][a] = 0, srcdst[x][y][c] = 0 if srcdst[x][y][c] = 0 srcdst[x][y][c] = DATA_TYPE_MAX if srcdst[x][y][c] > 0 srcdst[x][y][c] = DATA_TYPE_MIN if srcdst[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: srcdst Pointer to source and destination image. cmask Channel mask to indicate the alpha channel. Each bit of the mask represents a channel in the image. The channel corresponding 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 |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mlib_ImageDivAlpha(3MLIB), mlib_ImageDivAlpha_Fp(3MLIB), mlib_ImageDivAlpha_Fp_Inp(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_ImageDivAlpha_Inp(3MLIB)

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