Package ca.cgjennings.graphics.composites

Class AbstractARGBComposite

java.lang.Object

ca.cgjennings.graphics.composites.AbstractARGBComposite

All Implemented Interfaces:

java.awt.Composite

Direct Known Subclasses:

BlendMode

public abstract class AbstractARGBComposite
extends java.lang.Object
implements java.awt.Composite

An abstract base class for composites that support compositing (A)RGB image data. Concrete subclasses must implement createContext(java.awt.image.ColorModel, java.awt.image.ColorModel, java.awt.RenderingHints) to return a concrete subclass of AbstractCompositeContext. Concrete subclasses will transparently take advantage of multiple CPUs to increase performance.

Author:

Chris Jennings

Field Summary

Fields

Modifier and Type	Field	Description
protected float	alpha

Constructor Summary

Constructors

Constructor	Description
AbstractARGBComposite()
AbstractARGBComposite(float alpha)

Method Summary

Modifier and Type	Method	Description
java.awt.image.BufferedImage	compose(java.awt.image.BufferedImage source, int x, int y, java.awt.image.BufferedImage destination)	Blends one image directly into another using this composite.
abstract AbstractCompositeContext	createContext(java.awt.image.ColorModel srcColorModel, java.awt.image.ColorModel dstColorModel, java.awt.RenderingHints hints)
AbstractARGBComposite	derive(float alpha)
float	getAlpha()

Methods inherited from class java.lang.Object

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

Field Detail

alpha

protected float alpha

Constructor Detail

AbstractARGBComposite

public AbstractARGBComposite()

AbstractARGBComposite

public AbstractARGBComposite(float alpha)

Method Detail

derive

public AbstractARGBComposite derive(float alpha)

getAlpha

public float getAlpha()

compose

public java.awt.image.BufferedImage compose(java.awt.image.BufferedImage source,
                                            int x,
                                            int y,
                                            java.awt.image.BufferedImage destination)

Blends one image directly into another using this composite. If destination is null, a new compatible image will be created. If the source image is not in a format supported format, a copy of the image, suitably converted, will be used. This will also be done for a non-null destination in an unsupported format; in this case the converted destination is returned rather than the one passed to the method.

Parameters:

source - the source image

x - the x-offset into the destination at which to draw the source

y - the y-offset into the destination at which to draw the source

destination - the image to be painted into

Returns:

the destination image

createContext

public abstract AbstractCompositeContext createContext(java.awt.image.ColorModel srcColorModel,
                                                       java.awt.image.ColorModel dstColorModel,
                                                       java.awt.RenderingHints hints)

Specified by:

createContext in interface java.awt.Composite