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;
  
  /**
   * Image bit-depth conversion methods.
   * 
   * @author alanv@google.com (Alan Viverette)
   */
  public class Convert {
      static {
          System.loadLibrary("lept");
      }
      
      /**
       * Converts an image of any bit depth to 8-bit grayscale.
       *
       * @param pixs Source pix of any bit-depth.
       * @return a new Pix image or <code>null</code> on error
       */
      public static Pix convertTo8(Pix pixs) {
          if (pixs == null)
              throw new IllegalArgumentException("Source pix must be non-null");
  
          int nativePix = nativeConvertTo8(pixs.mNativePix);
  
          if (nativePix == 0)
              throw new RuntimeException("Failed to natively convert pix");
  
          return new Pix(nativePix);
      }
  
      // ***************
      // * NATIVE CODE *
      // ***************
  
      private static native int nativeConvertTo8(int nativePix);
  }
  