Update libjpeg-turbo to r722.

turbojpeg.h

Index: turbojpeg.h
===================================================================
--- turbojpeg.h	(revision 106486)
+++ turbojpeg.h	(working copy)
@@ -315,6 +315,13 @@
  * a grayscale output image.
  */
 #define TJXOPT_GRAY     8
+/**
+ * This option will prevent #tjTransform() from outputting a JPEG image for
+ * this particular transform (this can be used in conjunction with a custom
+ * filter to capture the transformed DCT coefficients without transcoding
+ * them.)
+ */
+#define TJXOPT_NOOUTPUT 16
 
 
 /**
@@ -362,7 +369,7 @@
 /**
  * Lossless transform
  */
-typedef struct
+typedef struct tjtransform
 {
   /**
    * Cropping region
@@ -376,6 +383,44 @@
    * The bitwise OR of one of more of the @ref TJXOPT_CROP "transform options"
    */
   int options;
+  /**
+   * Arbitrary data that can be accessed within the body of the callback
+   * function
+   */
+  void *data;
+  /**
+   * A callback function that can be used to modify the DCT coefficients
+   * after they are losslessly transformed but before they are transcoded to a
+   * new JPEG file.  This allows for custom filters or other transformations to
+   * be applied in the frequency domain.
+   *
+   * @param coeffs pointer to an array of transformed DCT coefficients.  (NOTE:
+   *        this pointer is not guaranteed to be valid once the callback
+   *        returns, so applications wishing to hand off the DCT coefficients
+   *        to another function or library should make a copy of them within
+   *        the body of the callback.)
+   * @param arrayRegion #tjregion structure containing the width and height of
+   *        the array pointed to by <tt>coeffs</tt> as well as its offset
+   *        relative to the component plane.  TurboJPEG implementations may
+   *        choose to split each component plane into multiple DCT coefficient
+   *        arrays and call the callback function once for each array.
+   * @param planeRegion #tjregion structure containing the width and height of
+   *        the component plane to which <tt>coeffs</tt> belongs
+   * @param componentID ID number of the component plane to which
+   *        <tt>coeffs</tt> belongs (Y, Cb, and Cr have, respectively, ID's of
+   *        0, 1, and 2 in typical JPEG images.)
+   * @param transformID ID number of the transformed image to which
+   *        <tt>coeffs</tt> belongs.  This is the same as the index of the
+   *        transform in the transforms array that was passed to
+   *        #tjTransform().
+   * @param transform a pointer to a #tjtransform structure that specifies the
+   *        parameters and/or cropping region for this transform
+   *
+   * @return 0 if the callback was successful, or -1 if an error occurred.
+   */
+  int (*customFilter)(short *coeffs, tjregion arrayRegion,
+    tjregion planeRegion, int componentIndex, int transformIndex,
+    struct tjtransform *transform);
 } tjtransform;
 
 /**