Integrate premultiply/unpremultiply operations into libjpeg-turbo....

third_party/libjpeg_turbo/jpeglib.h

 /*
  * jpeglib.h
  *
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * Copyright (C) 2009, D. R. Commander.
  * This file is part of the Independent JPEG Group's software.
  * 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,
@@ skipping 209 matching lines @@
         JCS_RGB,                /* red/green/blue as specified by the RGB_RED, RGB_GREEN,
                  RGB_BLUE, and RGB_PIXELSIZE macros */
         JCS_YCbCr,              /* Y/Cb/Cr (also known as YUV) */
         JCS_CMYK,               /* C/M/Y/K */
         JCS_YCCK,               /* Y/Cb/Cr/K */
         JCS_EXT_RGB,            /* red/green/blue */
         JCS_EXT_RGBX,           /* red/green/blue/x */
         JCS_EXT_BGR,            /* blue/green/red */
         JCS_EXT_BGRX,           /* blue/green/red/x */
         JCS_EXT_XBGR,           /* x/blue/green/red */
-        JCS_EXT_XRGB            /* x/red/green/blue */
+        JCS_EXT_XRGB,           /* x/red/green/blue */
+        JCS_EXT_BGRA,           /* blue/green/red/alpha */
 } 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 868 matching lines @@
 #ifdef JPEG_INTERNALS
 #include "jpegint.h"            /* fetch private declarations */
 #include "jerror.h"             /* fetch error codes too */
 #endif
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* JPEGLIB_H */