com.day.image

Class ImageSupport

java.lang.Object

com.day.image.ImageSupport

public class ImageSupport
extends java.lang.Object

The ImageSupport class provides methods, which are implemented differently for Java 1.3 and for Java 1.4. These methods are implemented as public static methods, which delegate to protected instance methods of implementations of this abstract class.

Since:

coati

Method Summary

Modifier and Type	Method and Description
static java.awt.image.BufferedImage	coerceData(java.awt.image.BufferedImage image, boolean isAlphaPremultiplied) Forces the data to match the state specified in the isAlphaPremultiplied variable.
static void	deregisterImageIOSpi() Deregisters the GIF Image writer to be used depending on the Java runtime from the ImageIO registry.
static void	registerImageIOSpi() Registers the GIF Image writer to be used depending on the Java runtime to the ImageIO registry.

Methods inherited from class java.lang.Object

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

Method Detail

coerceData

public static java.awt.image.BufferedImage coerceData(java.awt.image.BufferedImage image,
                                                      boolean isAlphaPremultiplied)

Forces the data to match the state specified in the isAlphaPremultiplied variable. It may multiply or divide the color raster data by alpha, or do nothing if the data is in the correct state.

NOTE: Due to a bug in the DirectColorModel.coerceData implementation of Java 1.3 we have to hack this in using the implementation of Java 1.4 for the 1.3 version and delegating to the library implementation for the 1.4 version.

Parameters:

image - The image to apply the alpha channel for.

isAlphaPremultiplied - true if the alpha has been premultiplied; false otherwise.

Returns:

The image with correct state. Depending on the implementation and the real need for coercion, the image may or may not be the same as the input image. Callers should not assume to get a different image or even different raster data object.

registerImageIOSpi

public static void registerImageIOSpi()

Registers the GIF Image writer to be used depending on the Java runtime to the ImageIO registry. If the image writer has already been registered, this method has no effect.

deregisterImageIOSpi

public static void deregisterImageIOSpi()

Deregisters the GIF Image writer to be used depending on the Java runtime from the ImageIO registry. If the image writer is not registered, this method has no effect.