clip.h
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- /* ***** BEGIN LICENSE BLOCK *****
- * Source last modified: $Id: clip.h,v 1.2.32.1 2004/07/09 01:59:56 hubbe Exp $
- *
- * Portions Copyright (c) 1995-2004 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 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the current version of the RealNetworks Community
- * Source License (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.
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL") in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your version of
- * this file only under the terms of the GPL, and not to allow others
- * to use your version of this file under the terms of either the RPSL
- * or RCSL, indicate your decision by deleting the provisions above
- * and replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient may
- * use your version of this file under the terms of any one of the
- * RPSL, the RCSL or the GPL.
- *
- * 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];
- /*
- * 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__ */