net.yura.mobile.util
Class ImageUtil

java.lang.Object
  net.yura.mobile.util.ImageUtil

public class ImageUtil
extends Object

Author:

Yura Mamyrin

Field Summary

static int	LARGESTBYTESTREAM
static int	THUMB_MAX_SIZE

Constructor Summary

ImageUtil()

Method Summary

static javax.microedition.lcdui.Image	colorize(javax.microedition.lcdui.Image original, int newColor)
static javax.microedition.lcdui.Image	createImage(InputStream is, int cW, int cH) Get a scaled image directly from inputstream
static javax.microedition.lcdui.Image	createImage(String filename, int cW, int cH) Created a sized Image from a file
static javax.microedition.lcdui.Image	getJPEGthumb(byte[] fileBytes) Get a thumbnail image from a byte array
static javax.microedition.lcdui.Image	getScaledImage(javax.microedition.lcdui.Image dispImage, int width, int height) Scale and resize image to fit our screen
static javax.microedition.lcdui.Image	getThumbFromFile(InputStream str) Traverse an inputStream and return a thumbnail image if any.
static javax.microedition.lcdui.Image	imageColor(javax.microedition.lcdui.Image image, int i) replaces all values of the blue channel with a color
static void	imageColor(int[] pixels, int color)
static javax.microedition.lcdui.Image	makeImage(int w, int h, int color)
static javax.microedition.lcdui.Image	resize(javax.microedition.lcdui.Image inImage, int rotation, int scaleFactor, int scalePwr) Fit the image on our screen size (width, height)
static javax.microedition.lcdui.Image	scaleImage(javax.microedition.lcdui.Image img, int newW, int newH)

Methods inherited from class java.lang.Object

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

Field Detail

LARGESTBYTESTREAM

public static int LARGESTBYTESTREAM

THUMB_MAX_SIZE

public static int THUMB_MAX_SIZE

Constructor Detail

ImageUtil

public ImageUtil()

Method Detail

colorize

public static javax.microedition.lcdui.Image colorize(javax.microedition.lcdui.Image original,
                                                      int newColor)

createImage

public static javax.microedition.lcdui.Image createImage(InputStream is,
                                                         int cW,
                                                         int cH)

Get a scaled image directly from inputstream

Parameters:

is - resource input stream

cW - screen width

cH - screen height

Returns:

Image if we can create/scale from is otherwise null

createImage

public static javax.microedition.lcdui.Image createImage(String filename,
                                                         int cW,
                                                         int cH)
                                                  throws IOException,
                                                         IOException

Created a sized Image from a file

Parameters:

filename - name of the image file

cW - device width

cH - device height

Returns:

Image returns scaled image that should fit our screen dimensions

Throws:

IOException

getJPEGthumb

public static javax.microedition.lcdui.Image getJPEGthumb(byte[] fileBytes)

Get a thumbnail image from a byte array

Parameters:

fileBytes -

Returns:

Image

getScaledImage

public static javax.microedition.lcdui.Image getScaledImage(javax.microedition.lcdui.Image dispImage,
                                                            int width,
                                                            int height)

Scale and resize image to fit our screen

Parameters:

dispImage, - the image

width - , max width

heigth, - max height

Returns:

Image - a scaled(resized) image

getThumbFromFile

public static javax.microedition.lcdui.Image getThumbFromFile(InputStream str)
                                                       throws IOException

Traverse an inputStream and return a thumbnail image if any. We build the thumbnail directly from the inputstream, thus avoiding to run out of memory on very large picture files.

Parameters:

str - the stream

Throws:

IOException

imageColor

public static final javax.microedition.lcdui.Image imageColor(javax.microedition.lcdui.Image image,
                                                              int i)

replaces all values of the blue channel with a color

imageColor

public static final void imageColor(int[] pixels,
                                    int color)

makeImage

public static javax.microedition.lcdui.Image makeImage(int w,
                                                       int h,
                                                       int color)

resize

public static javax.microedition.lcdui.Image resize(javax.microedition.lcdui.Image inImage,
                                                    int rotation,
                                                    int scaleFactor,
                                                    int scalePwr)

Fit the image on our screen size (width, height)

Parameters:

inImage - the image to be resized

scaleFactor - the factor with which we want to scale

scalePwr - shift width/height scalePwr bits

Returns:

Image - the resized image

scaleImage

public static javax.microedition.lcdui.Image scaleImage(javax.microedition.lcdui.Image img,
                                                        int newW,
                                                        int newH)