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IMAGERESIZE

Section: C Library Functions (3)
Updated: 16 Mar 1998
Index

NAME

ImageResize, ImageByteResize, ImageOverlayResize,ImageSignedByteResize, ImageUnsignedShortResize,ImageShortResize, ImageLongResize, ImageFloatResize,ImageDoubleResize - Resize XITE Image (pixeltype-specificroutines)

SYNTAX

#include "imagePix.h"

void ImageXxxxResize(ImageWidget wid, int x, int y,
int width, int height);
void ImageOverlayResize(ImageOverlayWidget wid, int x,
int y, int width, int height);

DESCRIPTION

These functions resize the image of a particular pixeltype.They are called by the resize method (and thus also by theset_values method) of the Image widget supplied with the XITEdistribution.

Images with three-primary colormaps are also handled(DirectColor and TrueColor 24-bit visuals).

Byte-order for pixmaps and bitmaps is defined by the Xserver, not the client. These functions handle swappingof the byte-order for 24-bit DirectCololor, 24-bitTrueColor and 1-bit StaticGray visuals. For 8- and 4-bitvisual depths, no byte-swapping is necessary. The swappingcould have been done by XPutImage, if necessary, butdoing it in these functions requires no extra work.

One of these functions (depending on the pixeltype of theband at hand) should be called when any one of the followinghas changed:

- Widget instance variable scaletype

This determines linear lookup in colormap or thresholding

- Widget instance variables scalea or scaleb

These determine offset and inclination of linearity ifscaletype implies linear lookup

- Widget instance variables minval or maxval

These determine the range used in linear lookup

- Widget instance variable colorcells

If less than 256, colors will be repeated cyclicallybecause lookup indices will repeat cyclically

- Widget instance variable colorptr

Determines lookup indices

- Widget instance variable displaymethod

When switching between reduced colordisplay and full-colordisplay.

- Widget instance variables xptr or yptr

These tables determine transformation from image coordinates toscreen window coordinates in the event that the image iszoomed or panned

- Widget instance variable resize

This is zero if no geometric transformation is necessary

- Widget instance variables xpan, ypan, zoom

These are determined by zoom and pan (and influence thegeometric transformation tables)

- Overlay widget instance variables cells and colorptr

Determines lookup indices into colormap

AUTHOR

Otto Milvang

REVISED

Svein Bře

DOC

Svein Bře

ID

$Id: ImageProtoPix.c,v 1.47 1997/03/24 11:29:10 svein Exp $

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