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| Rev | Author | Line No. | Line |
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| 1964 | serge | 1 | /* |
| 2 | * Copyright 2009 Red Hat Inc. |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice shall be included in |
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| 12 | * all copies or substantial portions of the Software. |
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| 13 | * |
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| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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| 18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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| 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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| 20 | * OTHER DEALINGS IN THE SOFTWARE. |
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| 21 | * |
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| 22 | * Authors: Dave Airlie |
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| 23 | */ |
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| 24 | #ifndef DRM_FIXED_H |
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| 25 | #define DRM_FIXED_H |
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| 26 | |||
| 27 | typedef union dfixed { |
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| 28 | u32 full; |
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| 29 | } fixed20_12; |
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| 30 | |||
| 31 | |||
| 32 | #define dfixed_const(A) (u32)(((A) << 12))/* + ((B + 0.000122)*4096)) */ |
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| 33 | #define dfixed_const_half(A) (u32)(((A) << 12) + 2048) |
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| 34 | #define dfixed_const_666(A) (u32)(((A) << 12) + 2731) |
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| 35 | #define dfixed_const_8(A) (u32)(((A) << 12) + 3277) |
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| 36 | #define dfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12) |
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| 37 | #define dfixed_init(A) { .full = dfixed_const((A)) } |
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| 38 | #define dfixed_init_half(A) { .full = dfixed_const_half((A)) } |
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| 39 | #define dfixed_trunc(A) ((A).full >> 12) |
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| 3031 | serge | 40 | #define dfixed_frac(A) ((A).full & ((1 << 12) - 1)) |
| 1964 | serge | 41 | |
| 42 | static inline u32 dfixed_floor(fixed20_12 A) |
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| 43 | { |
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| 44 | u32 non_frac = dfixed_trunc(A); |
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| 45 | |||
| 46 | return dfixed_const(non_frac); |
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| 47 | } |
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| 48 | |||
| 49 | static inline u32 dfixed_ceil(fixed20_12 A) |
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| 50 | { |
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| 51 | u32 non_frac = dfixed_trunc(A); |
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| 52 | |||
| 53 | if (A.full > dfixed_const(non_frac)) |
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| 54 | return dfixed_const(non_frac + 1); |
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| 55 | else |
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| 56 | return dfixed_const(non_frac); |
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| 57 | } |
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| 58 | |||
| 59 | static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B) |
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| 60 | { |
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| 61 | u64 tmp = ((u64)A.full << 13); |
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| 62 | |||
| 63 | do_div(tmp, B.full); |
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| 64 | tmp += 1; |
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| 65 | tmp /= 2; |
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| 66 | return lower_32_bits(tmp); |
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| 67 | } |
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| 68 | #endif |