Further exception cleanup

Use a new checked exception type (TJException) when passing through
errors from the underlying C library. This gives the application a
choice of catching all exceptions or just those from TurboJPEG.

Throw IllegalArgumentException at the JNI level when arguments to the
JNI function are incorrect, and when one of the TurboJPEG "utility"
functions returns an error (because, per the C API specification, those
functions will only return an error if one of their arguments is out of
range.)

Remove "throws Exception" from the signature of any methods that no
longer pass through an error from the TurboJPEG C library.

Credit Viktor for the new code

Code formatting tweaks

java/org/libjpegturbo/turbojpeg/YUVImage.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (C)2014 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2015 Viktor Szathmáry.  All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -86,8 +87,7 @@ public class YUVImage {
    * @param subsamp the level of chrominance subsampling to be used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
-  public YUVImage(int width, int[] strides, int height, int subsamp)
-    throws Exception {
+  public YUVImage(int width, int[] strides, int height, int subsamp) {
     setBuf(null, null, width, strides, height, subsamp, true);
   }
 
@@ -105,8 +105,7 @@ public class YUVImage {
    * @param subsamp the level of chrominance subsampling to be used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
-  public YUVImage(int width, int pad, int height, int subsamp)
-    throws Exception {
+  public YUVImage(int width, int pad, int height, int subsamp) {
     setBuf(new byte[TJ.bufSizeYUV(width, pad, height, subsamp)], width, pad,
            height, subsamp);
   }
@@ -146,7 +145,7 @@ public class YUVImage {
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public YUVImage(byte[][] planes, int[] offsets, int width, int[] strides,
-                  int height, int subsamp) throws Exception {
+                  int height, int subsamp) {
     setBuf(planes, offsets, width, strides, height, subsamp, false);
   }
 
@@ -172,7 +171,7 @@ public class YUVImage {
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public YUVImage(byte[] yuvImage, int width, int pad, int height,
-                  int subsamp) throws Exception {
+                  int subsamp) {
     setBuf(yuvImage, width, pad, height, subsamp);
   }
 
@@ -210,12 +209,12 @@ public class YUVImage {
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public void setBuf(byte[][] planes, int[] offsets, int width, int strides[],
-                     int height, int subsamp) throws Exception {
+                     int height, int subsamp) {
     setBuf(planes, offsets, width, strides, height, subsamp, false);
   }
 
   private void setBuf(byte[][] planes, int[] offsets, int width, int strides[],
-                     int height, int subsamp, boolean alloc) throws Exception {
+                     int height, int subsamp, boolean alloc) {
     if ((planes == null && !alloc) || width < 1 || height < 1 || subsamp < 0 ||
         subsamp >= TJ.NUMSAMP)
       throw new IllegalArgumentException("Invalid argument in YUVImage::setBuf()");
@@ -279,7 +278,7 @@ public class YUVImage {
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public void setBuf(byte[] yuvImage, int width, int pad, int height,
-                     int subsamp) throws Exception {
+                     int subsamp) {
     if (yuvImage == null || width < 1 || pad < 1 || ((pad & (pad - 1)) != 0) ||
         height < 1 || subsamp < 0 || subsamp >= TJ.NUMSAMP)
       throw new IllegalArgumentException("Invalid argument in YUVImage::setBuf()");
@@ -413,7 +412,7 @@ public class YUVImage {
    *
    * @return the size (in bytes) of the YUV image buffer
    */
-  public int getSize() throws Exception {
+  public int getSize() {
     if (yuvPlanes == null || yuvSubsamp < 0 || yuvSubsamp >= TJ.NUMSAMP)
       throw new IllegalStateException(NO_ASSOC_ERROR);
     int nc = (yuvSubsamp == TJ.SAMP_GRAY ? 1 : 3);