psdi.webclient.applet.wfcanvas.diagram

Class GifImageGenerator

java.lang.Object

psdi.webclient.applet.wfcanvas.diagram.GifImageGenerator

public class GifImageGenerator
extends java.lang.Object

This class is used to translate an image into a GIF format byte array.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	firstFree
protected int	freeCode
protected int	need
protected int[][]	StrTab

Constructor Summary

Constructors

Constructor and Description
GifImageGenerator()

Method Summary

Modifier and Type	Method and Description
protected int	addCodeToBuffer(int code, int n, byte[] buf, int pos) Adds the code to buffer adjusting for the bit offset.
protected void	initTable() Initializes the string table with first,next as unassigned
protected int	lookupCode(int code, int c) Looks up a code Take the current code and see if there is a longer string that contains the new character.
byte[]	makeGifImage(java.awt.Image image) Makes a gif image from the passed image.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

need

protected int need

firstFree

protected int firstFree

freeCode

protected int freeCode

StrTab

protected int[][] StrTab

Constructor Detail

GifImageGenerator

public GifImageGenerator()

Method Detail

makeGifImage

public byte[] makeGifImage(java.awt.Image image)

Makes a gif image from the passed image.

Parameters:

image - The image to convert

Returns:

The array representing the gif image

lookupCode

protected int lookupCode(int code,
                         int c)

Looks up a code Take the current code and see if there is a longer string that contains the new character. If there is return it otherwise add a new code and return -1 to indicate that the code was not matched. The lookup is cummulative in the main code loop.

Parameters:

code - The code to lookup

c - The next character

Returns:

Matching code or -1 if not found

addCodeToBuffer

protected int addCodeToBuffer(int code,
                              int n,
                              byte[] buf,
                              int pos)

Adds the code to buffer adjusting for the bit offset. The remaining bits in the current byte are in 'need' which is a static variable for this class Note that n < 0 is used to force alignment to the next byte

Parameters:

code - The code to add

n - The number of bits in the code

buf - The buffer

pos - The current byte position

Returns:

The new byte position

initTable

protected void initTable()

Initializes the string table with first,next as unassigned