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The Independent JPEG Group's JPEG software v6

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This commit is contained in:
Thomas G. Lane
1995-08-02 00:00:00 +00:00
committed by Kornel Lesiński
parent 357eba2331
commit 0baf670330
88 changed files with 9850 additions and 3723 deletions
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13
jidctfst.c
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@@ -1,7 +1,7 @@
/*
* jidctfst.c
*
* Copyright (C) 1994, Thomas G. Lane.
* Copyright (C) 1994-1995, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@@ -139,10 +139,15 @@
#ifdef RIGHT_SHIFT_IS_UNSIGNED
#define ISHIFT_TEMPS DCTELEM ishift_temp;
#if BITS_IN_JSAMPLE == 8
#define DCTELEMBITS 16 /* DCTELEM may be 16 or 32 bits */
#else
#define DCTELEMBITS 32 /* DCTELEM must be 32 bits */
#endif
#define IRIGHT_SHIFT(x,shft) \
((ishift_temp = (x)) < 0 ? \
(ishift_temp >> (shft)) | ((~((DCTELEM) 0)) << (32-(shft))) : \
(ishift_temp >> (shft)))
((ishift_temp = (x)) < 0 ? \
(ishift_temp >> (shft)) | ((~((DCTELEM) 0)) << (DCTELEMBITS-(shft))) : \
(ishift_temp >> (shft)))
#else
#define ISHIFT_TEMPS
#define IRIGHT_SHIFT(x,shft) ((x) >> (shft))