MMACH (lmmach) functions


LIBRARY ROUTINE

lvneg - Do the inversion of an image pixel by pixel, with an operation gating mask.

LIBRARY CALL

int
lvinv(xvimage *img1, xvimage *img2, int mflg, xvimage *img3)

INPUT

none

OUTPUT

none

RETURN VALUE

TRUE (1) on success, FALSE (0) on failure

DESCRIPTION

lvinv will do the inversion of an image pixel by pixel. img1 is an input image; img2 is the gating image, and mflg should be set to 1 if the gating image is to be used. img3 is the output image. Note that img1 can be used for both the input and the resulting output xvimage structure, in order to save space. A non-zero mask pixel in img2 enables the output pixel to contain the inversion. A zero mask pixel in img2 just transfers the value of the corresponding pixel in img1 to the output pixel.

The input, output and the optional mask images must be of the same size, data type, and have the same number of data bands.

ADDITIONAL INFORMATION

none

EXAMPLES

none

SIDE EFFECTS

none

RESTRICTIONS

lvinv can be defined for all data types supported by Khoros, but at the moment it has been implemented just for the bit and unsigned char types.

Due to the simultaneous processing of 32 pixels in BIT images, input images of the BIT data type must be converted to a special data structure before the library is called. This can be accomplished by using the format routine. After the library call, the unformat routine can convert the image back to the BIT data type.

MODIFICATION

General modifications made by Luiz Fernando Vieira, Adriano Nagelschmidt Rodrigues

FILES

$MMACH/objects/library/lmmach/src/lvneg.c

SEE ALSO

lmmach(3)

COPYRIGHT

Copyright (C) 1993-1997 Junior Barrera, Roberto Lotufo. All rights reserved.