mlib_ImageBlend1_Inp - blend with an alpha image, in place
cc [ flag... ] file... –lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageBlend1_Inp(mlib_image *src1dst,
const mlib_image *src2, const mlib_image *alpha);
The mlib_ImageBlend1_Inp() function blends two images together, in place, on a pixel-by-pixel basis using an alpha image, when alpha is also on a pixel basis. The alpha image can be a single-channel image or have the same number of channels as the source and destination images.
It uses the following equation when the alpha image is a single-channel image:
src1dst[x][y][i] = a[x][y][0]*src1dst[x][y][i] +
(1 - a[x][y][0])*src2[x][y][i]
It uses the following equation when the alpha image has the same number of channels as the source and destination images:
src1dst[x][y][i] = a[x][y][i]*src1dst[x][y][i] +
(1 - a[x][y][i])*src2[x][y][i]
The function takes the following arguments:
Pointer to first source and destination image.
Pointer to second source image.
Alpha image used to control blending. The a value equals (alpha * 2**(-8)) for MLIB_BYTE image, (alpha * 2**(-15)) for MLIB_SHORT image, (alpha * 2**(-16)) for MLIB_USHORT image, and (alpha * 2**(-31)) for MLIB_INT image.
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
See attributes(5) for descriptions of the following attributes:
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mlib_ImageBlend(3MLIB), mlib_ImageBlend_Fp(3MLIB), mlib_ImageBlend1_Fp_Inp(3MLIB), mlib_ImageBlend2_Fp_Inp(3MLIB), mlib_ImageBlend2_Inp(3MLIB), attributes(5)