com.google.zxing.client.j2me
Class LCDUIImageLuminanceSource

java.lang.Object
  com.google.zxing.LuminanceSource
      com.google.zxing.client.j2me.LCDUIImageLuminanceSource

public final class LCDUIImageLuminanceSource
extends LuminanceSource

A LuminanceSource based on Java ME's Image class. It does not support cropping or rotation.

Author:

dswitkin@google.com (Daniel Switkin), Sean Owen

Constructor Summary

LCDUIImageLuminanceSource(javax.microedition.lcdui.Image image)

Method Summary

byte[]	getMatrix() Fetches luminance data for the underlying bitmap.
byte[]	getRow(int y, byte[] row) Fetches one row of luminance data from the underlying platform's bitmap.

Methods inherited from class com.google.zxing.LuminanceSource

crop, getHeight, getWidth, isCropSupported, isRotateSupported, rotateCounterClockwise

Methods inherited from class java.lang.Object

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

Constructor Detail

LCDUIImageLuminanceSource

public LCDUIImageLuminanceSource(javax.microedition.lcdui.Image image)

Method Detail

getRow

public byte[] getRow(int y,
                     byte[] row)

Description copied from class: LuminanceSource

Fetches one row of luminance data from the underlying platform's bitmap. Values range from 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have to bitwise and with 0xff for each value. It is preferable for implementations of this method to only fetch this row rather than the whole image, since no 2D Readers may be installed and getMatrix() may never be called.

Specified by:

getRow in class LuminanceSource

Parameters:

y - The row to fetch, 0 <= y < getHeight().

row - An optional preallocated array. If null or too small, it will be ignored. Always use the returned object, and ignore the .length of the array.

Returns:

An array containing the luminance data.

getMatrix

public byte[] getMatrix()

Description copied from class: LuminanceSource

Fetches luminance data for the underlying bitmap. Values should be fetched using: int luminance = array[y * width + x] & 0xff;

Specified by:

getMatrix in class LuminanceSource

Returns:

A row-major 2D array of luminance values. Do not use result.length as it may be larger than width * height bytes on some platforms. Do not modify the contents of the result.