Add support for decoding to 565 to libjpeg_turbo

jpeglib.h

 /*
  * jpeglib.h
  *
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * Modified 2002-2009 by Guido Vollbeding.
  * Modifications:
- * Copyright (C) 2009-2011, 2013, D. R. Commander.
+ * Copyright (C) 2009-2011, 2013-2014, D. R. Commander.
  * Copyright (C) 2015, Google, Inc.
  * For conditions of distribution and use, see the accompanying README file.
  *
  * This file defines the application interface for the JPEG library.
  * Most applications using the library need only include this file,
  * and perhaps jerror.h if they want to know the exact error codes.
  */
 
 #ifndef JPEGLIB_H
 #define JPEGLIB_H
@@ skipping 217 matching lines @@
         /* When out_color_space it set to JCS_EXT_RGBX, JCS_EXT_BGRX,
            JCS_EXT_XBGR, or JCS_EXT_XRGB during decompression, the X byte is
            undefined, and in order to ensure the best performance,
            libjpeg-turbo can set that byte to whatever value it wishes.  Use
            the following colorspace constants to ensure that the X byte is set
            to 0xFF, so that it can be interpreted as an opaque alpha
            channel. */
         JCS_EXT_RGBA,           /* red/green/blue/alpha */
         JCS_EXT_BGRA,           /* blue/green/red/alpha */
         JCS_EXT_ABGR,           /* alpha/blue/green/red */
-        JCS_EXT_ARGB            /* alpha/red/green/blue */
+        JCS_EXT_ARGB,           /* alpha/red/green/blue */
+  JCS_RGB565      /* 5-bit red/6-bit green/5-bit blue */
 } J_COLOR_SPACE;
 
 /* DCT/IDCT algorithm options. */
 
 typedef enum {
         JDCT_ISLOW,             /* slow but accurate integer algorithm */
         JDCT_IFAST,             /* faster, less accurate integer method */
         JDCT_FLOAT              /* floating-point: accurate, fast on fast HW */
 } J_DCT_METHOD;
 
@@ skipping 955 matching lines @@
 #include "jerror.h"             /* fetch error codes too */
 #endif
 
 #ifdef __cplusplus
 #ifndef DONT_USE_EXTERN_C
 }
 #endif
 #endif
 
 #endif /* JPEGLIB_H */