content: /*
   * Copyright (C) 2011 Google Inc.
   *
   * 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 com.googlecode.leptonica.android;
  
  import android.graphics.Bitmap;
  import android.graphics.Bitmap.CompressFormat;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  
  /**
   * JPEG input and output methods.
   *
   * @author alanv@google.com (Alan Viverette)
   */
  public class JpegIO {
      static {
          System.loadLibrary("lept");
      }
  
      /** Default quality is 85%, which is reasonably good. */
      public static final int DEFAULT_QUALITY = 85;
  
      /** Progressive encoding is disabled by default to increase compatibility. */
      public static final boolean DEFAULT_PROGRESSIVE = false;
  
      /**
       * Returns a compressed JPEG byte representation of this Pix using default
       * parameters.
       *
       * @param pixs
       * @return a compressed JPEG byte array representation of the Pix
       */
      public static byte[] compressToJpeg(Pix pixs) {
          return compressToJpeg(pixs, DEFAULT_QUALITY, DEFAULT_PROGRESSIVE);
      }
  
      /**
       * Returns a compressed JPEG byte representation of this Pix.
       *
       * @param pixs A source pix image.
       * @param quality The quality of the compressed image. Valid range is 0-100.
       * @param progressive Whether to use progressive compression.
       * @return a compressed JPEG byte array representation of the Pix
       */
      public static byte[] compressToJpeg(Pix pixs, int quality, boolean progressive) {
          if (pixs == null)
              throw new IllegalArgumentException("Source pix must be non-null");
          if (quality < 0 || quality > 100)
              throw new IllegalArgumentException("Quality must be between 0 and 100 (inclusive)");
  
          final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
          final Bitmap bmp = WriteFile.writeBitmap(pixs);
          bmp.compress(CompressFormat.JPEG, quality, byteStream);
          bmp.recycle();
  
          final byte[] encodedData = byteStream.toByteArray();
  
          try {
              byteStream.close();
          } catch (IOException e) {
              e.printStackTrace();
          }
  
          return encodedData;
      }
  
      // ***************
      // * NATIVE CODE *
      // ***************
  
      private static native byte[] nativeCompressToJpeg(
              int nativePix, int quality, boolean progressive);
  }
  