[linux.git] / include / drm / drm_fixed.h

/*
 * Copyright 2009 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 */
#ifndef DRM_FIXED_H
#define DRM_FIXED_H

typedef union dfixed {
	u32 full;
} fixed20_12;


#define dfixed_const(A) (u32)(((A) << 12))/*  + ((B + 0.000122)*4096)) */
#define dfixed_const_half(A) (u32)(((A) << 12) + 2048)
#define dfixed_const_666(A) (u32)(((A) << 12) + 2731)
#define dfixed_const_8(A) (u32)(((A) << 12) + 3277)
#define dfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12)
#define dfixed_init(A) { .full = dfixed_const((A)) }
#define dfixed_init_half(A) { .full = dfixed_const_half((A)) }
#define dfixed_trunc(A) ((A).full >> 12)

static inline u32 dfixed_floor(fixed20_12 A)
{
	u32 non_frac = dfixed_trunc(A);

	return dfixed_const(non_frac);
}

static inline u32 dfixed_ceil(fixed20_12 A)
{
	u32 non_frac = dfixed_trunc(A);

	if (A.full > dfixed_const(non_frac))
		return dfixed_const(non_frac + 1);
	else
		return dfixed_const(non_frac);
}

static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B)
{
	u64 tmp = ((u64)A.full << 13);

	do_div(tmp, B.full);
	tmp += 1;
	tmp /= 2;
	return lower_32_bits(tmp);
}
#endif
Commit	Line	Data
771fe6b9 JG	1	/*
	2	* Copyright 2009 Red Hat Inc.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*
	22	* Authors: Dave Airlie
	23	*/
68adac5e BS	24	#ifndef DRM_FIXED_H
68adac5e BS	25	#define DRM_FIXED_H
771fe6b9	26
68adac5e	27	typedef union dfixed {
771fe6b9 JG	28	u32 full;
	29	} fixed20_12;
	30
	31
68adac5e BS	32	#define dfixed_const(A) (u32)(((A) << 12))/* + ((B + 0.000122)4096)) /
	33	#define dfixed_const_half(A) (u32)(((A) << 12) + 2048)
	34	#define dfixed_const_666(A) (u32)(((A) << 12) + 2731)
	35	#define dfixed_const_8(A) (u32)(((A) << 12) + 3277)
	36	#define dfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12)
	37	#define dfixed_init(A) { .full = dfixed_const((A)) }
	38	#define dfixed_init_half(A) { .full = dfixed_const_half((A)) }
	39	#define dfixed_trunc(A) ((A).full >> 12)
771fe6b9	40
68adac5e	41	static inline u32 dfixed_floor(fixed20_12 A)
69b3b5e5	42	{
68adac5e	43	u32 non_frac = dfixed_trunc(A);
69b3b5e5	44
68adac5e	45	return dfixed_const(non_frac);
69b3b5e5 AD	46	}
69b3b5e5 AD	47
68adac5e	48	static inline u32 dfixed_ceil(fixed20_12 A)
69b3b5e5	49	{
68adac5e	50	u32 non_frac = dfixed_trunc(A);
69b3b5e5	51
68adac5e BS	52	if (A.full > dfixed_const(non_frac))
68adac5e BS	53	return dfixed_const(non_frac + 1);
69b3b5e5	54	else
68adac5e	55	return dfixed_const(non_frac);
69b3b5e5 AD	56	}
69b3b5e5 AD	57
68adac5e	58	static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B)
771fe6b9 JG	59	{
	60	u64 tmp = ((u64)A.full << 13);
	61
	62	do_div(tmp, B.full);
	63	tmp += 1;
	64	tmp /= 2;
	65	return lower_32_bits(tmp);
	66	}
	67	#endif