Fix backward compatibility between the Java classes and the 1.2.x JNI library (as long as the 1.3 Java features are not used.)

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@973 632fc199-4ca6-4c93-a231-07263d6284db

java/org/libjpegturbo/turbojpeg/TJDecompressor.java

@@ -301,8 +301,12 @@ public class TJDecompressor {
         desiredHeight < 0 || pixelFormat < 0 || pixelFormat >= TJ.NUMPF ||
         flags < 0)
       throw new Exception("Invalid argument in decompress()");
-    decompress(jpegBuf, jpegBufSize, dstBuf, x, y, desiredWidth, pitch,
-               desiredHeight, pixelFormat, flags);
+    if (x > 0 || y > 0)
+      decompress(jpegBuf, jpegBufSize, dstBuf, x, y, desiredWidth, pitch,
+                 desiredHeight, pixelFormat, flags);
+    else
+      decompress(jpegBuf, jpegBufSize, dstBuf, desiredWidth, pitch,
+                 desiredHeight, pixelFormat, flags);
   }
 
   /**