diff options
Diffstat (limited to '3rdparty/libjpeg/jfdctfst.c')
-rw-r--r-- | 3rdparty/libjpeg/jfdctfst.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/3rdparty/libjpeg/jfdctfst.c b/3rdparty/libjpeg/jfdctfst.c index 8cad5f22939..d779f78bf4f 100644 --- a/3rdparty/libjpeg/jfdctfst.c +++ b/3rdparty/libjpeg/jfdctfst.c @@ -2,7 +2,7 @@ * jfdctfst.c * * Copyright (C) 1994-1996, Thomas G. Lane. - * Modified 2003-2009 by Guido Vollbeding. + * Modified 2003-2015 by Guido Vollbeding. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * @@ -109,6 +109,8 @@ /* * Perform the forward DCT on one block of samples. + * + * cK represents cos(K*pi/16). */ GLOBAL(void) @@ -145,7 +147,7 @@ jpeg_fdct_ifast (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) tmp11 = tmp1 + tmp2; tmp12 = tmp1 - tmp2; - /* Apply unsigned->signed conversion */ + /* Apply unsigned->signed conversion. */ dataptr[0] = tmp10 + tmp11 - 8 * CENTERJSAMPLE; /* phase 3 */ dataptr[4] = tmp10 - tmp11; |