/**
  * Encode the uncompressed source image stored in <code>srcImage</code> and output a YUV planar
  * image to the given destination buffer. See {@link #encodeYUV(byte[], int)} for more detail.
  *
  * @param srcImage a <code>BufferedImage</code> instance containing RGB or grayscale pixels to be
  *     encoded
  * @param dstBuf buffer that will receive the YUV planar image. Use {@link TJ#bufSizeYUV} to
  *     determine the appropriate size for this buffer based on the image width, height, and level
  *     of chrominance subsampling.
  * @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
  */
 public void encodeYUV(BufferedImage srcImage, byte[] dstBuf, int flags) throws Exception {
   if (srcImage == null || dstBuf == null || flags < 0)
     throw new Exception("Invalid argument in encodeYUV()");
   int width = srcImage.getWidth();
   int height = srcImage.getHeight();
   int pixelFormat;
   boolean intPixels = false;
   if (byteOrder == null) byteOrder = ByteOrder.nativeOrder();
   switch (srcImage.getType()) {
     case BufferedImage.TYPE_3BYTE_BGR:
       pixelFormat = TJ.PF_BGR;
       break;
     case BufferedImage.TYPE_4BYTE_ABGR:
     case BufferedImage.TYPE_4BYTE_ABGR_PRE:
       pixelFormat = TJ.PF_XBGR;
       break;
     case BufferedImage.TYPE_BYTE_GRAY:
       pixelFormat = TJ.PF_GRAY;
       break;
     case BufferedImage.TYPE_INT_BGR:
       if (byteOrder == ByteOrder.BIG_ENDIAN) pixelFormat = TJ.PF_XBGR;
       else pixelFormat = TJ.PF_RGBX;
       intPixels = true;
       break;
     case BufferedImage.TYPE_INT_RGB:
     case BufferedImage.TYPE_INT_ARGB:
     case BufferedImage.TYPE_INT_ARGB_PRE:
       if (byteOrder == ByteOrder.BIG_ENDIAN) pixelFormat = TJ.PF_XRGB;
       else pixelFormat = TJ.PF_BGRX;
       intPixels = true;
       break;
     default:
       throw new Exception("Unsupported BufferedImage format");
   }
   WritableRaster wr = srcImage.getRaster();
   if (subsamp < 0) throw new Exception("Subsampling level not set");
   if (intPixels) {
     SinglePixelPackedSampleModel sm = (SinglePixelPackedSampleModel) srcImage.getSampleModel();
     int pitch = sm.getScanlineStride();
     DataBufferInt db = (DataBufferInt) wr.getDataBuffer();
     int[] buf = db.getData();
     encodeYUV(buf, width, pitch, height, pixelFormat, dstBuf, subsamp, flags);
   } else {
     ComponentSampleModel sm = (ComponentSampleModel) srcImage.getSampleModel();
     int pixelSize = sm.getPixelStride();
     if (pixelSize != TJ.getPixelSize(pixelFormat))
       throw new Exception("Inconsistency between pixel format and pixel size in BufferedImage");
     int pitch = sm.getScanlineStride();
     DataBufferByte db = (DataBufferByte) wr.getDataBuffer();
     byte[] buf = db.getData();
     encodeYUV(buf, width, pitch, height, pixelFormat, dstBuf, subsamp, flags);
   }
   compressedSize = TJ.bufSizeYUV(width, height, subsamp);
 }
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 private static void initImg(BufferedImage img, int pf, int flags) throws Exception {
   WritableRaster wr = img.getRaster();
   int imgType = img.getType();
   if (imgType == BufferedImage.TYPE_INT_RGB
       || imgType == BufferedImage.TYPE_INT_BGR
       || imgType == BufferedImage.TYPE_INT_ARGB
       || imgType == BufferedImage.TYPE_INT_ARGB_PRE) {
     SinglePixelPackedSampleModel sm = (SinglePixelPackedSampleModel) img.getSampleModel();
     int pitch = sm.getScanlineStride();
     DataBufferInt db = (DataBufferInt) wr.getDataBuffer();
     int[] buf = db.getData();
     initIntBuf(buf, img.getWidth(), pitch, img.getHeight(), pf, flags);
   } else {
     ComponentSampleModel sm = (ComponentSampleModel) img.getSampleModel();
     int pitch = sm.getScanlineStride();
     DataBufferByte db = (DataBufferByte) wr.getDataBuffer();
     byte[] buf = db.getData();
     initBuf(buf, img.getWidth(), pitch, img.getHeight(), pf, flags);
   }
 }
 /**
  * Decompress the JPEG source image associated with this decompressor instance and output a
  * decompressed image to the given <code>BufferedImage</code> instance.
  *
  * @param dstImage a <code>BufferedImage</code> instance that will receive the decompressed image
  * @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
  */
 public void decompress(BufferedImage dstImage, int flags) throws Exception {
   if (dstImage == null || flags < 0) throw new Exception("Invalid argument in decompress()");
   int desiredWidth = dstImage.getWidth();
   int desiredHeight = dstImage.getHeight();
   int scaledWidth = getScaledWidth(desiredWidth, desiredHeight);
   int scaledHeight = getScaledHeight(desiredWidth, desiredHeight);
   if (scaledWidth != desiredWidth || scaledHeight != desiredHeight)
     throw new Exception(
         "BufferedImage dimensions do not match a scaled image size that TurboJPEG is capable of generating.");
   int pixelFormat;
   boolean intPixels = false;
   if (byteOrder == null) byteOrder = ByteOrder.nativeOrder();
   switch (dstImage.getType()) {
     case BufferedImage.TYPE_3BYTE_BGR:
       pixelFormat = TJ.PF_BGR;
       break;
     case BufferedImage.TYPE_4BYTE_ABGR:
     case BufferedImage.TYPE_4BYTE_ABGR_PRE:
       pixelFormat = TJ.PF_XBGR;
       break;
     case BufferedImage.TYPE_BYTE_GRAY:
       pixelFormat = TJ.PF_GRAY;
       break;
     case BufferedImage.TYPE_INT_BGR:
       if (byteOrder == ByteOrder.BIG_ENDIAN) pixelFormat = TJ.PF_XBGR;
       else pixelFormat = TJ.PF_RGBX;
       intPixels = true;
       break;
     case BufferedImage.TYPE_INT_RGB:
       if (byteOrder == ByteOrder.BIG_ENDIAN) pixelFormat = TJ.PF_XRGB;
       else pixelFormat = TJ.PF_BGRX;
       intPixels = true;
       break;
     case BufferedImage.TYPE_INT_ARGB:
     case BufferedImage.TYPE_INT_ARGB_PRE:
       if (byteOrder == ByteOrder.BIG_ENDIAN) pixelFormat = TJ.PF_ARGB;
       else pixelFormat = TJ.PF_BGRA;
       intPixels = true;
       break;
     default:
       throw new Exception("Unsupported BufferedImage format");
   }
   WritableRaster wr = dstImage.getRaster();
   if (intPixels) {
     SinglePixelPackedSampleModel sm = (SinglePixelPackedSampleModel) dstImage.getSampleModel();
     int stride = sm.getScanlineStride();
     DataBufferInt db = (DataBufferInt) wr.getDataBuffer();
     int[] buf = db.getData();
     if (jpegBuf == null) throw new Exception(NO_ASSOC_ERROR);
     decompress(jpegBuf, jpegBufSize, buf, scaledWidth, stride, scaledHeight, pixelFormat, flags);
   } else {
     ComponentSampleModel sm = (ComponentSampleModel) dstImage.getSampleModel();
     int pixelSize = sm.getPixelStride();
     if (pixelSize != TJ.getPixelSize(pixelFormat))
       throw new Exception("Inconsistency between pixel format and pixel size in BufferedImage");
     int pitch = sm.getScanlineStride();
     DataBufferByte db = (DataBufferByte) wr.getDataBuffer();
     byte[] buf = db.getData();
     decompress(buf, scaledWidth, pitch, scaledHeight, pixelFormat, flags);
   }
 }