Class RefImage

java.lang.Object

java.awt.Image

java.awt.image.BufferedImage

org.openpdf.renderer.RefImage

All Implemented Interfaces:

RenderedImage, WritableRenderedImage, Transparency

public class RefImage
extends BufferedImage

A BufferedImage subclass that holds a strong reference to its graphics object. This means that the graphics will never go away as long as someone holds a reference to this image, and createGraphics() and getGraphics() can be called multiple times safely, and will always return the same graphics object.

Field Summary

Fields

Modifier and Type	Field	Description
private Graphics2D	g	a strong reference to the graphics object

Fields inherited from class BufferedImage

TYPE_3BYTE_BGR, TYPE_4BYTE_ABGR, TYPE_4BYTE_ABGR_PRE, TYPE_BYTE_BINARY, TYPE_BYTE_GRAY, TYPE_BYTE_INDEXED, TYPE_CUSTOM, TYPE_INT_ARGB, TYPE_INT_ARGB_PRE, TYPE_INT_BGR, TYPE_INT_RGB, TYPE_USHORT_555_RGB, TYPE_USHORT_565_RGB, TYPE_USHORT_GRAY

Fields inherited from class Image

accelerationPriority, SCALE_AREA_AVERAGING, SCALE_DEFAULT, SCALE_FAST, SCALE_REPLICATE, SCALE_SMOOTH, UndefinedProperty

Fields inherited from interface Transparency

BITMASK, OPAQUE, TRANSLUCENT

Constructor Summary

Constructors

Constructor	Description
RefImage(int width, int height, int type)	Creates a new instance of RefImage

Method Summary

Modifier and Type	Method	Description
Graphics2D	createGraphics()	Create a graphics object only if it is currently null, otherwise return the existing graphics object.

Methods inherited from class BufferedImage

addTileObserver, coerceData, copyData, getAlphaRaster, getColorModel, getData, getData, getGraphics, getHeight, getHeight, getMinTileX, getMinTileY, getMinX, getMinY, getNumXTiles, getNumYTiles, getProperty, getProperty, getPropertyNames, getRaster, getRGB, getRGB, getSampleModel, getSource, getSources, getSubimage, getTile, getTileGridXOffset, getTileGridYOffset, getTileHeight, getTileWidth, getTransparency, getType, getWidth, getWidth, getWritableTile, getWritableTileIndices, hasTileWriters, isAlphaPremultiplied, isTileWritable, releaseWritableTile, removeTileObserver, setData, setRGB, setRGB, toString

Methods inherited from class Image

flush, getAccelerationPriority, getCapabilities, getScaledInstance, setAccelerationPriority

Methods inherited from class Object

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

Field Details

g

private Graphics2D g

a strong reference to the graphics object

Constructor Details

RefImage

public RefImage(int width,
 int height,
 int type)

Creates a new instance of RefImage

Method Details

createGraphics

public Graphics2D createGraphics()

Create a graphics object only if it is currently null, otherwise return the existing graphics object.

Overrides:

createGraphics in class BufferedImage