/**
* Associate an uncompressed source image with this compressor instance.
*
* @param srcImage image buffer containing RGB or grayscale pixels to be compressed
* @param x x offset (in pixels) of the region from which the JPEG image should be compressed,
* relative to the start of <code>srcImage</code>.
* @param y y offset (in pixels) of the region from which the JPEG image should be compressed,
* relative to the start of <code>srcImage</code>.
* @param width width (in pixels) of the region in the source image from which the JPEG image
* should be compressed.
* @param pitch bytes per line of the source image. Normally, this should be <code>
* width * TJ.pixelSize(pixelFormat)</code> if the source image is unpadded, but you can use
* this parameter to, for instance, specify that the scanlines in the source image are padded
* to a 4-byte boundary or to compress a JPEG image from a region of a larger source image.
* You can also be clever and use this parameter to skip lines, etc. Setting this parameter to
* 0 is the equivalent of setting it to <code>width *
* TJ.pixelSize(pixelFormat)</code>.
* @param height height (in pixels) of the region in the source image from which the JPEG image
* should be compressed.
* @param pixelFormat pixel format of the source image (one of {@link TJ TJ.PF_*})
*/
public void setSourceImage(
byte[] srcImage, int x, int y, int width, int pitch, int height, int pixelFormat)
throws Exception {
if (handle == 0) init();
if (srcImage == null
|| x < 0
|| y < 0
|| width < 1
|| height < 1
|| pitch < 0
|| pixelFormat < 0
|| pixelFormat >= TJ.NUMPF) throw new Exception("Invalid argument in setSourceImage()");
srcBuf = srcImage;
srcWidth = width;
if (pitch == 0) srcPitch = width * TJ.getPixelSize(pixelFormat);
else srcPitch = pitch;
srcHeight = height;
srcPixelFormat = pixelFormat;
srcX = x;
srcY = y;
}
/** Create a TurboJPEG compressor instance. */
public TJCompressor() throws Exception {
init();
}