Android Open Source - ivotingverification Planar Y U V Luminance Source

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (C) 2013 Eesti Vabariigi Valimiskomisjon 
 * (Estonian National Electoral Committee), www.vvk.ee
 *// w  w w  .j  a v a 2s .  co  m
 * Written in 2013 by AS Finestmedia, www.finestmedia.ee
 *
 * Vote-verification application for Estonian Internet voting system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and  
 * permission notice:  
 * 
 * Copyright (C) 2008 ZXing authors
 * 
 * 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 ee.vvk.ivotingverification.qr;

import android.graphics.Bitmap;

import com.google.zxing.LuminanceSource;

import ee.vvk.ivotingverification.util.Util;

/**
 * This object extends LuminanceSource around an array of YUV data returned from
 * the camera driver, with the option to crop to a rectangle within the full
 * data. This can be used to exclude superfluous pixels around the perimeter and
 * speed up decoding.
 * 
 * It works for any pixel format where the Y channel is planar and appears
 * first, including YCbCr_420_SP and YCbCr_422_SP.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class PlanarYUVLuminanceSource extends LuminanceSource {

  private final byte[] yuvData;
  private final int dataWidth;
  private final int dataHeight;
  private final int left;
  private final int top;

  public PlanarYUVLuminanceSource(byte[] yuvData, int dataWidth,
      int dataHeight, int left, int top, int width, int height,
      boolean reverseHorizontal) {
    super(width, height);

    if (left + width > dataWidth || top + height > dataHeight) {
      if (Util.DEBUGGABLE) {
        throw new IllegalArgumentException(
            "Crop rectangle does not fit within image data.");
      }
    }

    this.yuvData = yuvData;
    this.dataWidth = dataWidth;
    this.dataHeight = dataHeight;
    this.left = left;
    this.top = top;
    if (reverseHorizontal) {
      reverseHorizontal(width, height);
    }
  }

  @Override
  public byte[] getRow(int y, byte[] row) {
    if (y < 0 || y >= getHeight()) {
      if (Util.DEBUGGABLE) {
        throw new IllegalArgumentException(
            "Requested row is outside the image: " + y);
      }
    }
    int width = getWidth();
    if (row == null || row.length < width) {
      row = new byte[width];
    }
    int offset = (y + top) * dataWidth + left;
    System.arraycopy(yuvData, offset, row, 0, width);
    return row;
  }

  @Override
  public byte[] getMatrix() {
    int width = getWidth();
    int height = getHeight();

    if (width == dataWidth && height == dataHeight) {
      return yuvData;
    }

    int area = width * height;
    byte[] matrix = new byte[area];
    int inputOffset = top * dataWidth + left;

    if (width == dataWidth) {
      System.arraycopy(yuvData, inputOffset, matrix, 0, area);
      return matrix;
    }

    byte[] yuv = yuvData;
    for (int y = 0; y < height; y++) {
      int outputOffset = y * width;
      System.arraycopy(yuv, inputOffset, matrix, outputOffset, width);
      inputOffset += dataWidth;
    }
    return matrix;
  }

  @Override
  public boolean isCropSupported() {
    return true;
  }

  public Bitmap renderCroppedGreyscaleBitmap() {
    int width = getWidth();
    int height = getHeight();
    int[] pixels = new int[width * height];
    byte[] yuv = yuvData;
    int inputOffset = top * dataWidth + left;

    for (int y = 0; y < height; y++) {
      int outputOffset = y * width;
      for (int x = 0; x < width; x++) {
        int grey = yuv[inputOffset + x] & 0xff;
        pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);
      }
      inputOffset += dataWidth;
    }

    Bitmap bitmap = Bitmap.createBitmap(width, height,
        Bitmap.Config.ARGB_8888);
    bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
    return bitmap;
  }

  private void reverseHorizontal(int width, int height) {
    byte[] yuvData = this.yuvData;
    for (int y = 0, rowStart = top * dataWidth + left; y < height; y++, rowStart += dataWidth) {
      int middle = rowStart + width / 2;
      for (int x1 = rowStart, x2 = rowStart + width - 1; x1 < middle; x1++, x2--) {
        byte temp = yuvData[x1];
        yuvData[x1] = yuvData[x2];
        yuvData[x2] = temp;
      }
    }
  }
}

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