mlib_ImageMulAlpha_Fp (3MLIB)

Name

mlib_ImageMulAlpha_Fp - alpha channel multiplication

Synopsis

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

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

Description

The mlib_ImageMulAlpha_Fp() function multiplies 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.

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 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_ImageMulAlpha(3MLIB), mlib_ImageMulAlpha_Inp(3MLIB), mlib_ImageMulAlpha_Fp_Inp(3MLIB), attributes(5)