source/common/mv.h

   1 /*****************************************************************************
   2  * Copyright (C) 2013 x265 project
   3  *
   4  * Authors: Steve Borho <steve@borho.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  19  *
  20  * This program is also available under a commercial proprietary license.
  21  * For more information, contact us at license @ x265.com.
  22  *****************************************************************************/
  23
  24 #ifndef X265_MV_H
  25 #define X265_MV_H
  26
  27 #include "common.h"
  28 #include "primitives.h"
  29
  30 namespace x265 {
  31 // private x265 namespace
  32
  33 #if _MSC_VER
  34 #pragma warning(disable: 4201) // non-standard extension used (nameless struct/union)
  35 #endif
  36
  37 struct MV
  38 {
  39 public:
  40
  41     union {
  42         struct { int16_t x, y; };
  43
  44         int32_t word;
  45     };
  46
  47     MV()                                       {}
  48     MV(int32_t w) : word(w)                    {}
  49     MV(int16_t _x, int16_t _y) : x(_x), y(_y)  {}
  50
  51     MV& operator =(uint32_t w)                 { word = w; return *this; }
  52
  53     MV& operator +=(const MV& other)           { x += other.x; y += other.y; return *this; }
  54
  55     MV& operator -=(const MV& other)           { x -= other.x; y -= other.y; return *this; }
  56
  57     MV& operator >>=(int i)                    { x >>= i; y >>= i; return *this; }
  58
  59     MV& operator <<=(int i)                    { x <<= i; y <<= i; return *this; }
  60
  61     MV operator >>(int i) const                { return MV(x >> i, y >> i); }
  62
  63     MV operator <<(int i) const                { return MV(x << i, y << i); }
  64
  65     MV operator *(int16_t i) const             { return MV(x * i, y * i); }
  66
  67     MV operator -(const MV& other) const       { return MV(x - other.x, y - other.y); }
  68
  69     MV operator +(const MV& other) const       { return MV(x + other.x, y + other.y); }
  70
  71     bool operator ==(const MV& other) const    { return word == other.word; }
  72
  73     bool operator !=(const MV& other) const    { return word != other.word; }
  74
  75     bool operator !() const                    { return !word; }
  76
  77     // Scale down a QPEL mv to FPEL mv, rounding up by one HPEL offset
  78     MV roundToFPel() const                     { return MV((x + 2) >> 2, (y + 2) >> 2); }
  79
  80     // Scale up an FPEL mv to QPEL by shifting up two bits
  81     MV toQPel() const                          { return *this << 2; }
  82
  83     bool inline notZero() const                { return this->word != 0; }
  84
  85     bool inline isSubpel() const               { return (this->word & 0x00030003) != 0; }
  86
  87     MV mvmin(const MV& m) const                { return MV(x > m.x ? m.x : x, y > m.y ? m.y : y); }
  88
  89     MV mvmax(const MV& m) const                { return MV(x < m.x ? m.x : x, y < m.y ? m.y : y); }
  90
  91     MV clipped(const MV& _min, const MV& _max) const
  92     {
  93         MV cl = mvmin(_max);
  94
  95         return cl.mvmax(_min);
  96     }
  97
  98     // returns true if MV is within range (inclusive)
  99     bool checkRange(const MV& _min, const MV& _max) const
 100     {
 101         return x >= _min.x && x <= _max.x && y >= _min.y && y <= _max.y;
 102     }
 103 };
 104 }
 105
 106 #endif // ifndef X265_MV_H