mlib_ImageZoomIndex

- zoom on color-indexed image

Synopsis

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

mlib_status mlib_ImageZoomIndex(mlib_image *dst, const mlib_image *src,
     mlib_d64 zoomx, mlib_d64 zoomy, mlib_filter filter, mlib_edge edge,
     const void *colormap);

Description

The mlib_ImageZoomIndex() function will enlarge or minify the source image by the X and Y zoom factors. It uses the interpolation method as described by the resampling filter.

The image data type must be MLIB_BYTE or MLIB_SHORT.

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

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

The center of the source image is mapped onto the center of the destination image.

Parameters

The function takes the following arguments:

dst

Pointer to destination image.

src

Pointer to source image.

zoomx

X zoom factor. zoomx > 0.0.

zoomy

Y zoom factor. zoomy > 0.0.

filter

Type of resampling filter. It can be one of the following:

MLIB_NEAREST
MLIB_BILINEAR
MLIB_BICUBIC
MLIB_BICUBIC2

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

colormap

Internal data structure for inverse color mapping. This data structure is generated by the mlib_ImageColorTrue2IndexInit() function.

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_ImageZoom(3MLIB), mlib_ImageZoom_Fp(3MLIB), mlib_ImageZoomIn2X(3MLIB), mlib_ImageZoomIn2X_Fp(3MLIB), mlib_ImageZoomIn2XIndex(3MLIB), mlib_ImageZoomOut2X(3MLIB), mlib_ImageZoomOut2X_Fp(3MLIB), mlib_ImageZoomOut2XIndex(3MLIB), attributes(5)