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  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.  */
  24. #ifndef DRM_FIXED_H
  25. #define DRM_FIXED_H
  26.  
  27. typedef union dfixed {
  28.         u32 full;
  29. } fixed20_12;
  30.  
  31.  
  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)
  40. #define dfixed_frac(A) ((A).full & ((1 << 12) - 1))
  41.  
  42. static inline u32 dfixed_floor(fixed20_12 A)
  43. {
  44.         u32 non_frac = dfixed_trunc(A);
  45.  
  46.         return dfixed_const(non_frac);
  47. }
  48.  
  49. static inline u32 dfixed_ceil(fixed20_12 A)
  50. {
  51.         u32 non_frac = dfixed_trunc(A);
  52.  
  53.         if (A.full > dfixed_const(non_frac))
  54.                 return dfixed_const(non_frac + 1);
  55.         else
  56.                 return dfixed_const(non_frac);
  57. }
  58.  
  59. static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B)
  60. {
  61.         u64 tmp = ((u64)A.full << 13);
  62.  
  63.         do_div(tmp, B.full);
  64.         tmp += 1;
  65.         tmp /= 2;
  66.         return lower_32_bits(tmp);
  67. }
  68. #endif
  69.