Android Open Source - nsa-away Luminance Source






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License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Copyright 2009 ZXing authors//from   w  w  w . ja va 2  s. c o m
 * Copyright 2011 Robert Theis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sector67.nsaaway.ocr.complex;

/**
 * The purpose of this class hierarchy is to abstract different bitmap implementations across
 * platforms into a standard interface for requesting greyscale luminance values. The interface
 * only provides immutable methods; therefore crop and rotation create copies. This is to ensure
 * that one Reader does not modify the original luminance source and leave it in an unknown state
 * for other Readers in the chain.
 *
 * The code for this class was adapted from the ZXing project: http://code.google.com/p/zxing
 */
public abstract class LuminanceSource {

  private final int width;
  private final int height;

  protected LuminanceSource(int width, int height) {
    this.width = width;
    this.height = height;
  }

  /**
   * 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.
   *
   * @param y The row to fetch, 0 <= y < getHeight().
   * @param 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.
   * @return An array containing the luminance data.
   */
  public abstract byte[] getRow(int y, byte[] row);

  /**
   * Fetches luminance data for the underlying bitmap. Values should be fetched using:
   * int luminance = array[y * width + x] & 0xff;
   *
   * @return 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.
   */
  public abstract byte[] getMatrix();

  /**
   * @return The width of the bitmap.
   */
  public final int getWidth() {
    return width;
  }

  /**
   * @return The height of the bitmap.
   */
  public final int getHeight() {
    return height;
  }

  /**
   * @return Whether this subclass supports cropping.
   */
  public boolean isCropSupported() {
    return true;
  }

  /**
   * Returns a new object with cropped image data. Implementations may keep a reference to the
   * original data rather than a copy. Only callable if isCropSupported() is true.
   *
   * @param left The left coordinate, 0 <= left < getWidth().
   * @param top The top coordinate, 0 <= top <= getHeight().
   * @param width The width of the rectangle to crop.
   * @param height The height of the rectangle to crop.
   * @return A cropped version of this object.
   */
  public LuminanceSource crop(int left, int top, int width, int height) {
    throw new RuntimeException("This luminance source does not support cropping.");
  }

  /**
   * @return Whether this subclass supports counter-clockwise rotation.
   */
  public boolean isRotateSupported() {
    return false;
  }

  /**
   * Returns a new object with rotated image data. Only callable if isRotateSupported() is true.
   *
   * @return A rotated version of this object.
   */
  public LuminanceSource rotateCounterClockwise() {
    throw new RuntimeException("This luminance source does not support rotation.");
  }

}




Java Source Code List

org.sector67.nsaaway.CreateAKeyActivity.java
org.sector67.nsaaway.DisplayCiphertextActivity.java
org.sector67.nsaaway.DisplayPlaintextActivity.java
org.sector67.nsaaway.EnterCiphertextActivity.java
org.sector67.nsaaway.EnterPlaintextActivity.java
org.sector67.nsaaway.KeyChooserActivity.java
org.sector67.nsaaway.KeyChooserDialogFragment.java
org.sector67.nsaaway.KeyManagerActivity.java
org.sector67.nsaaway.MainActivity.java
org.sector67.nsaaway.SettingsActivity.java
org.sector67.nsaaway.SettingsFragment.java
org.sector67.nsaaway.SimpleOCRActivity.java
org.sector67.nsaaway.android.AlertUtils.java
org.sector67.nsaaway.file.AbstractFileUtils.java
org.sector67.nsaaway.file.DirectoryChooserActivity.java
org.sector67.nsaaway.file.FileUtilsFactory.java
org.sector67.nsaaway.file.FileUtils.java
org.sector67.nsaaway.file.KitKatFileUtils.java
org.sector67.nsaaway.file.LegacyFileUtils.java
org.sector67.nsaaway.key.KeyUtils.java
org.sector67.nsaaway.ocr.complex.BeepManager.java
org.sector67.nsaaway.ocr.complex.CaptureActivityHandler.java
org.sector67.nsaaway.ocr.complex.CaptureActivity.java
org.sector67.nsaaway.ocr.complex.DecodeHandler.java
org.sector67.nsaaway.ocr.complex.DecodeThread.java
org.sector67.nsaaway.ocr.complex.FinishListener.java
org.sector67.nsaaway.ocr.complex.HelpActivity.java
org.sector67.nsaaway.ocr.complex.LuminanceSource.java
org.sector67.nsaaway.ocr.complex.OcrCharacterHelper.java
org.sector67.nsaaway.ocr.complex.OcrInitAsyncTask.java
org.sector67.nsaaway.ocr.complex.OcrRecognizeAsyncTask.java
org.sector67.nsaaway.ocr.complex.OcrResultFailure.java
org.sector67.nsaaway.ocr.complex.OcrResultText.java
org.sector67.nsaaway.ocr.complex.OcrResult.java
org.sector67.nsaaway.ocr.complex.PlanarYUVLuminanceSource.java
org.sector67.nsaaway.ocr.complex.PreferencesActivity.java
org.sector67.nsaaway.ocr.complex.ViewfinderView.java
org.sector67.nsaaway.ocr.complex.camera.AutoFocusManager.java
org.sector67.nsaaway.ocr.complex.camera.CameraConfigurationManager.java
org.sector67.nsaaway.ocr.complex.camera.CameraManager.java
org.sector67.nsaaway.ocr.complex.camera.PreviewCallback.java
org.sector67.nsaaway.ocr.complex.camera.ShutterButton.java
org.sector67.nsaaway.ocr.complex.language.LanguageCodeHelper.java