Package net.coobird.thumbnailator.resizers

Class AbstractResizer

java.lang.Object

net.coobird.thumbnailator.resizers.AbstractResizer

All Implemented Interfaces:

Resizer

Direct Known Subclasses:

BicubicResizer, BilinearResizer, NullResizer, ProgressiveBilinearResizer

public abstract class AbstractResizer
extends java.lang.Object
implements Resizer

A class which performs a resize operation on a source image and outputs the result to a destination image.

Field Summary

Fields

Modifier and Type	Field	Description
protected static java.awt.RenderingHints.Key	KEY_INTERPOLATION
protected java.util.Map<java.awt.RenderingHints.Key,java.lang.Object>	RENDERING_HINTS	Rendering hints to use when resizing an image.
protected java.util.Map<java.awt.RenderingHints.Key,java.lang.Object>	UNMODIFIABLE_RENDERING_HINTS	Field used to hold the rendering hints in an unmodifiable form.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractResizer(java.lang.Object interpolationValue, java.util.Map<java.awt.RenderingHints.Key,java.lang.Object> hints)	Initializes the AbstractResizer.

Method Summary

Modifier and Type	Method	Description
protected java.awt.Graphics2D	createGraphics(java.awt.image.BufferedImage img)	Returns a Graphics2D object with rendering hints pre-applied.
java.util.Map<java.awt.RenderingHints.Key,java.lang.Object>	getRenderingHints()	Returns the rendering hints that the resizer uses.
protected void	performChecks(java.awt.image.BufferedImage srcImage, java.awt.image.BufferedImage destImage)	Performs checks on the source and destination image to see if they are images which can be processed.
void	resize(java.awt.image.BufferedImage srcImage, java.awt.image.BufferedImage destImage)	Performs a resize operation from a source image and outputs to a destination image.

Methods inherited from class java.lang.Object

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

Field Detail

RENDERING_HINTS

protected final java.util.Map<java.awt.RenderingHints.Key,java.lang.Object> RENDERING_HINTS

Rendering hints to use when resizing an image.

UNMODIFIABLE_RENDERING_HINTS

protected final java.util.Map<java.awt.RenderingHints.Key,java.lang.Object> UNMODIFIABLE_RENDERING_HINTS

Field used to hold the rendering hints in an unmodifiable form.

KEY_INTERPOLATION

protected static final java.awt.RenderingHints.Key KEY_INTERPOLATION

Constructor Detail

AbstractResizer

protected AbstractResizer(java.lang.Object interpolationValue,
                          java.util.Map<java.awt.RenderingHints.Key,java.lang.Object> hints)

Initializes the AbstractResizer.

Parameters:

interpolationValue - The rendering hint value to use for the interpolation hint.

hints - Other rendering hints to add.

Method Detail

resize

public void resize(java.awt.image.BufferedImage srcImage,
                   java.awt.image.BufferedImage destImage)

Performs a resize operation from a source image and outputs to a destination image.

If the source or destination image is null, then a NullPointerException will be thrown.

Specified by:

resize in interface Resizer

Parameters:

srcImage - The source image.

destImage - The destination image.

Throws:

java.lang.NullPointerException - When the source and/or the destination image is null.

createGraphics

protected java.awt.Graphics2D createGraphics(java.awt.image.BufferedImage img)

Returns a Graphics2D object with rendering hints pre-applied.

Parameters:

img - BufferedImage for which the Graphics2D object should be generated for.

Returns:

Graphics2D object for the given BufferedImage.

performChecks

protected void performChecks(java.awt.image.BufferedImage srcImage,
                             java.awt.image.BufferedImage destImage)

Performs checks on the source and destination image to see if they are images which can be processed.

Parameters:

srcImage - The source image.

destImage - The destination image.

getRenderingHints

public java.util.Map<java.awt.RenderingHints.Key,java.lang.Object> getRenderingHints()

Returns the rendering hints that the resizer uses.

The keys and values used for the rendering hints are those defined in the RenderingHints class.

Returns:

Rendering hints used when resizing the image.

See Also:

RenderingHints