com.atlassian.core.util.thumbnail
Class MemoryImageScale

java.lang.Object
  com.atlassian.core.util.thumbnail.MemoryImageScale

All Implemented Interfaces:

ImageScaler

public class MemoryImageScale
extends Object
implements ImageScaler

Constructor Summary

MemoryImageScale(DimensionsHelper dimensionsHelper, ImageFactory imageFactory)

Method Summary

static BufferedImage	getScaledInstance(BufferedImage image, int targetWidth, int targetHeight, Object hint, boolean higherQuality) Convenience method that returns a scaled instance of the provided BufferedImage.
static BufferedImage	scaleImage(BufferedImage imageToScale, Dimensions newDimensions)
static BufferedImage	scaleImage(BufferedImage imageToScale, Thumber.WidthHeightHelper newDimensions)
BufferedImage	scaleImage(int maxWidth, int maxHeight, ReusableBufferedInputStream imageStream)

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryImageScale

public MemoryImageScale(DimensionsHelper dimensionsHelper,
                        ImageFactory imageFactory)

Method Detail

scaleImage

public BufferedImage scaleImage(int maxWidth,
                                int maxHeight,
                                ReusableBufferedInputStream imageStream)
                         throws IOException

Specified by:

scaleImage in interface ImageScaler

Throws:

IOException

scaleImage

public static BufferedImage scaleImage(BufferedImage imageToScale,
                                       Thumber.WidthHeightHelper newDimensions)

scaleImage

public static BufferedImage scaleImage(BufferedImage imageToScale,
                                       Dimensions newDimensions)

getScaledInstance

public static BufferedImage getScaledInstance(BufferedImage image,
                                              int targetWidth,
                                              int targetHeight,
                                              Object hint,
                                              boolean higherQuality)

Convenience method that returns a scaled instance of the provided BufferedImage.

Borrowed from http://today.java.net/pub/a/today/2007/04/03/perils-of-image-getscaledinstance.html Warning: this algorith enters endless loop, when target size is bigger than image size and higherQuality is true

Parameters:

image - the original image to be scaled

targetWidth - the desired width of the scaled instance, in pixels

targetHeight - the desired height of the scaled instance, in pixels

hint - one of the rendering hints that corresponds to RenderingHints.KEY_INTERPOLATION (e.g. RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR, RenderingHints.VALUE_INTERPOLATION_BILINEAR, RenderingHints.VALUE_INTERPOLATION_BICUBIC)

higherQuality - if true, this method will use a multi-step scaling technique that provides higher quality than the usual one-step technique (only useful in downscaling cases, where targetWidth or targetHeight is smaller than the original dimensions, and generally only when the BILINEAR hint is specified)

Returns:

a scaled version of the original BufferedImage