/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Pixrect implementation utilities
 */

#ifndef _SYS_PR_IMPL_UTIL_H
#define	_SYS_PR_IMPL_UTIL_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SunOS 1.10 */

#ifdef	__cplusplus
extern "C" {
#endif

/* Reiser cpp concatenation macros (which don't work in ANSI-C) */
#if	defined(__STDC__) && !defined(__LIBCPP__)

#ifndef _CAT
#define	_CAT(a, b)	a##b
#endif

#else	/* __STDC__ */

#ifndef _CAT
#undef	_IDENT
#define	_IDENT(x)	x
#define	_CAT(a, b)	_IDENT(a)b
#endif

#endif	/* __STDC__ */

/* code selection macros */
#define	IFTRUE(a, b) a
#define	IFFALSE(a, b) b

/* and together multiple options */
#define	IFAND IFAND2
#define	IFAND2(opt1, opt2, a, b) opt1(opt2(a, b), b)
#define	IFAND3(opt1, opt2, opt3, a, b) opt1(opt2(opt3(a, b), b), b)
#define	IFAND4(opt1, opt2, opt3, opt4, a, b) \
		opt1(opt2(opt3(opt4(a, b), b), b), b)
#define	IFAND5(opt1, opt2, opt3, opt4, opt5, a, b) \
		opt1(opt2(opt3(opt4(opt5(a, b), b), b), b), b)
#define	IFAND6(opt1, opt2, opt3, opt4, opt5, opt6, a, b) \
		opt1(opt2(opt3(opt4(opt5(opt6(a, b), b), b), b), b), b)

#ifdef _KERNEL
#define	IFKERNEL IFTRUE
#else
#define	IFKERNEL IFFALSE
#endif

/* lint */
#ifdef __lint

#define	IFLINT	IFTRUE

int _ZERO_;	/* "constant in conditional context" workaround */
#define	_ONE_	(!_ZERO_)
int _loop;	/* "_loop redefinition hides earlier one" */

#else	/* __lint */

#define	IFLINT	IFFALSE

#define	_ZERO_ 0
#define	_ONE_ 1

#endif	/* __lint */

/* portability aids */
#ifdef mc68000

#define	IF68000 IFTRUE

typedef caddr_t INT_T;		/* pseudo-integer type (address register) */
typedef ulong_t	PTR_T;		/* pseudo-pointer type (data register) */
typedef short	LOOP_T;		/* loop variable (for dbra loops) */

#define	LOOP_DECR(var)	(--(var) != -1)

#else	/* mc68000 */

#define	IF68000 IFFALSE

typedef int	INT_T;
typedef caddr_t PTR_T;
typedef int	LOOP_T;

#define	LOOP_DECR(var)	(--(var) >= 0)

#endif	/* mc68000 */

#if defined(__sparc)
#define	IFSPARC IFTRUE
#else
#define	IFSPARC IFFALSE
#endif

/* true if we can make 32 bit accesses on 16 bit boundaries */
#ifndef SHORT_ALIGN
#define	SHORT_ALIGN	(!defined(__sparc))
#endif

#if SHORT_ALIGN
#define	IFSHORT_ALIGN	IFTRUE
#else
#define	IFSHORT_ALIGN	IFFALSE
#endif


#ifndef LITTLE_ENDIAN
#define	LITTLE_ENDIAN	(defined(__i386) || defined(__amd64))
#endif

#if LITTLE_ENDIAN
#define	ENDIAN	IFTRUE
#else
#define	ENDIAN	IFFALSE
#endif

/*
 * SunOS release number
 * warning: these tests are fragile
 */
#if defined(__sun) && !defined(SUNOS)
#ifdef _sys_types_h
#define	SUNOS	41
#else	/* _sys_types_h */
#ifdef NFDBITS
#define	SUNOS	40
#else	/* NFDBITS */
#define	SUNOS	35
#endif	/* NFDBITS */
#endif	/* _sys_types_h */
#endif

#if SUNOS >= 40
#define	IFSUNOS4	IFTRUE
#else
#define	IFSUNOS4	IFFALSE
#endif

#if SUNOS >= 41
#define	IFSUNOS41	IFTRUE
#else
#define	IFSUNOS41	IFFALSE
#endif


/*
 * misc. macros
 */

/* statement macro */
#define	_STMT(op)	do { op } while (_ZERO_)

/* loop macros */
#define	PR_LOOPVP(var, op)	do { op; } while (LOOP_DECR(var))
#define	PR_LOOPV(var, op)	_STMT(while (LOOP_DECR(var)) { op; })
#define	PR_LOOPP(count, op)	_STMT(\
	IFLINT(, register LOOP_T) _loop = (count); PR_LOOPVP(_loop, op); \
)
#define	PR_LOOP(count, op)	_STMT(\
	IFLINT(, register LOOP_T) _loop = (count); PR_LOOPV(_loop, op); \
)

/* pointer manipulation */
#define	PTR_ADD(p, incr)	((caddr_t)(p) + (incr))
#define	PTR_INCR(type, p, incr) (p = (type) ((caddr_t)(p) + (incr)))

/* unshifted pixrect op codes */
#define	PIX_OPSRC	(12)
#define	PIX_OPDST	(10)
#define	PIX_OPNOT(op)	((op) ^ 15)
#define	PIX_OPCLR	(0)
#define	PIX_OPSET	(15)

/* extract color and op code fields */
#define	PIXOP_COLOR(op) ((op) >> 5)
#define	PIXOP_OP(op)	((op) >> 1 & 15)

/* reverse video src or dst */
#define	PIX_OP_REVERSESRC(op)	(((op) & 3) << 2 | (op) >> 2 & 3)
#define	PIX_OP_REVERSEDST(op)	((~(op) & 5) << 1 | ~(op) >> 1 & 0x5)

/* determine if op needs src or dst */
#define	PIX_OP_NEEDS_SRC(op)	(((op) >> 2 ^ (op)) & 3)
#define	PIX_OP_NEEDS_DST(op)	(((op) >> 1 ^ (op)) & 5)

/* misc. data types */
typedef short	MPR_T;		/* type used for memory pixrect data */
typedef ushort_t UMPR_T;	/* unsigned equivalent of MPR_T */

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_PR_IMPL_UTIL_H */