SYNOPSIS
#include <vistaio.h>
VistaIOImage VistaIOCopyImagePixels (src, dest, band)
- VistaIOImage src, dest; VistaIOBand band;
VistaIOImage VistaIOCopyImageAttrs (src, dest)
- VistaIOImage src, dest;
VistaIOImage VistaIOCopyImage (src, dest, band)
- VistaIOImage src, dest; VistaIOBand band;
ARGUMENTS
- src
- Specifies the source image.
- dest
- May specify a destination image; or may be NULL to indicate that a new destination image should be created.
- band
- May specify a particular band of the source image to be copied, or may be the constant VistaIOAllBands to indicate that all bands of the source image should be copied.
DESCRIPTION
VistaIOCopyImagePixels copies pixel values from the source image to the destination image. (No other image properties are copied.)VistaIOCopyImageAttrs copies attributes from the source image to the destination image. (No pixel values are copied.) If the destination image already has an attribute list, it is first deleted. Then the destination image is given a copy of the source image's attribute list. Finally, if the source and destination images do not have the same number of bands then the destination image's band interpretation attributes may be edited to ensure their validity:
-
- if they do not have the same number of bands then (a) any band interpretation attributes, such as frame_interp and color_interp, are deleted from the destination image's copy; (b) the size of the destination image's component dimension (ncomponents) is set equal to its number of bands; and (c) the sizes of its other band interpretation dimensions (nframes, nviewpoints, and ncolors) are set to 1.
- if they have the same number of bands then (a) all attributes are copied unchanged from the source image to the destination image; and (b) the sizes of the band interpretation dimensions are copied as well.
VistaIOCopyImage copies both pixel values and attributes from one image to the other. It is equivalent to calling both VistaIOCopyImagePixels and VistaIOCopyImageAttrs.
You can specify NULL as a destination image to any of these routines; they will then create an appropriate destination image, copy to it, and return it. If you supply a destination image to VistaIOCopyImage or VistaIOCopyImagePixels, it must have the same number of rows, number of columns, and pixel representation as the source image; also, it must have a number of bands consistent with src and band.
RETURN VALUES
Each of these routines returns the destination image if it is successful and NULL otherwise.NOTES
VistaIOCopyAttrList(3) is used to copy attributes from the source image to the destination image. Thus the destination image's attribute list contains its own copy of each attribute value --- except that for a VistaIOPointer value, the pointer is copied but not the (opaque) data structure to which it points.DIAGNOSTICS
- ``Band band referenced in image of nbands band(s).''
- The band argument is invalid given the number of bands in src.
- ``Destination image has dest_nbands bands; src_nbands expected.''
- A destination image was specified but it has the wrong number of bands. If band is VistaIOAllBands, the destination image must have the same number of bands as the source image. Otherwise, it must have a single band.
- ``Destination image has dest_prop property; src_prop expected.''
- Property is one of ``pixels'', ``rows'', or ``columns''. A destination image was specified but it does not have the same pixel representation, number of rows, and number of columns as the source image.