com.sun.javafx.sg.prism

Class RegionImageCache

java.lang.Object

com.sun.javafx.sg.prism.RegionImageCache

class RegionImageCache
extends java.lang.Object

RegionImageCache - A fixed pixel count sized cache of Images keyed by arbitrary set of arguments. All images are held with SoftReferences so they will be dropped by the GC if heap memory gets tight. When our size hits max pixel count least recently requested images are removed first.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	RegionImageCache.CachedImage

Field Summary

Fields

Modifier and Type	Field and Description
private RTTexture	backingStore
private static int	HEIGHT
private RectanglePacker	hPacker
private java.util.HashMap<java.lang.Integer,RegionImageCache.CachedImage>	imageMap
private static int	MAX_SIZE
private RectanglePacker	vPacker
private static int	WIDTH

Constructor Summary

Constructors

Constructor and Description
RegionImageCache(ResourceFactory factory)

Method Summary

Modifier and Type	Method and Description
(package private) RTTexture	getBackingStore()
(package private) boolean	getImageLocation(java.lang.Integer key, Rectangle rect, Background background, Shape shape, Graphics g) Search the cache for a background image representing the arguments.
(package private) boolean	isImageCachable(int w, int h) Check if the image size is to big to be stored in the cache

Methods inherited from class java.lang.Object

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

Field Detail

MAX_SIZE

private static final int MAX_SIZE

See Also:

Constant Field Values

WIDTH

private static final int WIDTH

See Also:

Constant Field Values

HEIGHT

private static final int HEIGHT

See Also:

Constant Field Values

imageMap

private java.util.HashMap<java.lang.Integer,RegionImageCache.CachedImage> imageMap

backingStore

private RTTexture backingStore

hPacker

private RectanglePacker hPacker

vPacker

private RectanglePacker vPacker

Constructor Detail

RegionImageCache

RegionImageCache(ResourceFactory factory)

Method Detail

isImageCachable

boolean isImageCachable(int w,
                        int h)

Check if the image size is to big to be stored in the cache

Parameters:

w - The image width

h - The image height

Returns:

True if the image size is less than max

getBackingStore

RTTexture getBackingStore()

getImageLocation

boolean getImageLocation(java.lang.Integer key,
                         Rectangle rect,
                         Background background,
                         Shape shape,
                         Graphics g)

Search the cache for a background image representing the arguments. When this method succeeds the x and y coordinates in rect are adjust to the location in the backing store when the image is stored. If a failure occurred the rect is set to empty to indicate the caller to disable caching.

Parameters:

key - the hash key for the image

rect - the rect image. On input, width and height determine the requested texture space. On ouput, the x and y the location in the texture

background - the background used to validated if the correct image was found

shape - the shape used to validated if the correct image was found

g - the graphics to flush if the texture needs to be restarted

Returns:

true means to caller needs to render to rect to initialize the content.