0,0 → 1,67 |
/* |
* 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 |