diff options
Diffstat (limited to 'src/3rdparty/libjpeg/jddctmgr.c')
| -rw-r--r-- | src/3rdparty/libjpeg/jddctmgr.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/3rdparty/libjpeg/jddctmgr.c b/src/3rdparty/libjpeg/jddctmgr.c index bdbde3454d..0ded9d5741 100644 --- a/src/3rdparty/libjpeg/jddctmgr.c +++ b/src/3rdparty/libjpeg/jddctmgr.c @@ -2,6 +2,7 @@ * jddctmgr.c * * Copyright (C) 1994-1996, Thomas G. Lane. + * Modified 2002-2010 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. * @@ -324,6 +325,7 @@ start_pass (j_decompress_ptr cinfo) * coefficients scaled by scalefactor[row]*scalefactor[col], where * scalefactor[0] = 1 * scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7 + * We apply a further scale factor of 1/8. */ FLOAT_MULT_TYPE * fmtbl = (FLOAT_MULT_TYPE *) compptr->dct_table; int row, col; @@ -337,7 +339,7 @@ start_pass (j_decompress_ptr cinfo) for (col = 0; col < DCTSIZE; col++) { fmtbl[i] = (FLOAT_MULT_TYPE) ((double) qtbl->quantval[i] * - aanscalefactor[row] * aanscalefactor[col]); + aanscalefactor[row] * aanscalefactor[col] * 0.125); i++; } } |