clip.h
上传用户:zhongxx05
上传日期:2007-06-06
资源大小:33641k
文件大小:3k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef __CLIP_H__
- #define __CLIP_H__ 1
- #ifdef __cplusplus
- extern "C" {
- #endif
- /*
- * Clipping constants:
- *
- * Note: the CLIPNEG/CLIPPOS numbers are somewhat rounded values
- * that correspond to settings of GAMMA_MAX, KAPPA_MAX, and BETA_MAX
- * parameters defined in "yuv.h". If you are planning to modify any
- * of these constants, the sizes of the clip tables shall be
- * adjusted as well.
- */
- #define CLIPRNG 256 /* unclipped range */
- #define CLIPNEG (288 * 4) /* rounded max neg. value */
- #define CLIPPOS (288 * 4) /* rounded max shot over 256 */
- /* ## of bits to be left after clipping: */
- #define MIN_CLIP_BITS 4
- #define MAX_CLIP_BITS 8
- /*
- * Rounding & dithering constants:
- */
- #define _ROUND(b) ((1U << (MAX_CLIP_BITS-(b))) >> 1)
- #ifndef NO_DITHER
- #define DITHER_LOW(b) ((1U << (MAX_CLIP_BITS-(b))) >> 2)
- #define DITHER_HIGH(b) ((3U << (MAX_CLIP_BITS-(b))) >> 2)
- #else /* just correct rounding: */
- #define DITHER_LOW(b) _ROUND(b)
- #define DITHER_HIGH(b) _ROUND(b)
- #endif
- /*
- * Actual clip tables:
- */
- #ifndef CLIP_MAIN
- #define CLIP_EXTERN extern
- #else
- #define CLIP_EXTERN /**/
- #endif
- CLIP_EXTERN unsigned char clip[MAX_CLIP_BITS-MIN_CLIP_BITS+1][CLIPNEG+CLIPRNG+CLIPPOS]; /* Flawfinder: ignore */
- /*
- * Clipping & dithering macros:
- */
- #define _CLIP(b,v) clip[(b)-MIN_CLIP_BITS][(v)+CLIPNEG]
- #define CLIP_ROUND(b,v) _CLIP(b,v+_ROUND(b))
- #define CLIP_LOW(b,v) _CLIP(b,v+DITHER_LOW(b))
- #define CLIP_HIGH(b,v) _CLIP(b,v+DITHER_HIGH(b))
- /*
- * Generic clipping macro:
- */
- #define CLIP(r,b,v) CLIP_##r(b,v)
- #ifdef __cplusplus
- }
- #endif
- #endif /* __CLIP_H__ */