/**
* 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);
}
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);
}
}