mlib_ImageZoomTranslateToGray

- zoom, with translation, and convert to grayscale

Synopsis

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

mlib_status mlib_ImageZoomTranslateToGray(mlib_image *dst, 
     const mlib_image *src, mlib_d64 zoomx, mlib_d64 zoomy, 
     mlib_d64 tx, mlib_d64 ty, mlib_filter filter, mlib_edge edge, 
     const mlib_s32 *ghigh, const mlib_s32 *glow);

Description

The mlib_ImageZoomTranslateToGray() function will enlarge or minify the source binary image by the X and Y zoom factors, with translation, and convert the resulting image into a grayscale image.

It uses the following equation for coordinate mapping:

xd = zoomx*xs + tx
yd = zoomy*ys + ty

where a point with coordinates (xs, ys) in the source image is mapped to a point with coordinates (xd, yd) in the destination image.

The width and height of the destination image can be different from the width and height of the source image.

The center of the upper-left corner pixel of an image is located at (0.5, 0.5).

Parameters

The function takes the following arguments:

dst

Pointer to destination image. It must be of type MLIB_BYTE and have just one channel.

src

Pointer to source image. It must be of type MLIB_BIT and have just one channel.

zoomx

X zoom factor. zoomx > 0.

zoomy

Y zoom factor. zoomy > 0.

tx

X translation.

ty

Y translation.

filter

Type of resampling filter. It must be MLIB_NEAREST.

edge

Type of edge condition. It can be one of the following:

MLIB_EDGE_DST_NO_WRITE
MLIB_EDGE_DST_FILL_ZERO
MLIB_EDGE_OP_NEAREST
MLIB_EDGE_SRC_EXTEND
MLIB_EDGE_SRC_PADDED

ghigh

Pointer to value for '1' pixels in source image.

glow

Pointer to value for '0' pixels in source image.

Return Values

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

Attributes

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

See Also

mlib_ImageSubsampleBinaryToGray(3MLIB), attributes(5)