68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
|
/*
|
||
|
|
* 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
|