mi/micoord.h

   1 /*
   2  * Copyright (C) 2000 The XFree86 Project, Inc.  All Rights Reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to
   6  * deal in the Software without restriction, including without limitation the
   7  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   8  * sell copies of the Software, and to permit persons to whom the Software is
   9  * 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 THE
  17  * XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  18  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * Except as contained in this notice, the name of the XFree86 Project shall
  22  * not be used in advertising or otherwise to promote the sale, use or other
  23  * dealings in this Software without prior written authorization from the
  24  * XFree86 Project.
  25  *
  26  */
  27
  28 #ifndef _MICOORD_H_
  29 #define _MICOORD_H_ 1
  30
  31 #include "servermd.h"
  32
  33 /* Macros which handle a coordinate in a single register */
  34
  35 /*
  36  * Most compilers will convert divisions by 65536 into shifts, if signed
  37  * shifts exist.  If your machine does arithmetic shifts and your compiler
  38  * can't get it right, add to this line.
  39  */
  40
  41 /*
  42  * mips compiler - what a joke - it CSEs the 65536 constant into a reg
  43  * forcing as to use div instead of shift.  Let's be explicit.
  44  */
  45
  46 #if defined(mips) || \
  47     defined(sparc) || defined(__sparc64__) || \
  48     defined(__alpha) || defined(__alpha__) || \
  49     defined(__i386__) || defined(__i386) || defined(__ia64__) || \
  50     defined(__s390x__) || defined(__s390__) || \
  51     defined(__amd64__) || defined(amd64) || defined(__amd64)
  52 #define GetHighWord(x) (((int) (x)) >> 16)
  53 #else
  54 #define GetHighWord(x) (((int) (x)) / 65536)
  55 #endif
  56
  57 #if IMAGE_BYTE_ORDER == MSBFirst
  58 #define intToCoord(i,x,y)   (((x) = GetHighWord(i)), ((y) = (int) ((short) (i))))
  59 #define coordToInt(x,y) (((x) << 16) | ((y) & 0xffff))
  60 #define intToX(i)       (GetHighWord(i))
  61 #define intToY(i)       ((int) ((short) i))
  62 #else
  63 #define intToCoord(i,x,y)   (((x) = (int) ((short) (i))), ((y) = GetHighWord(i)))
  64 #define coordToInt(x,y) (((y) << 16) | ((x) & 0xffff))
  65 #define intToX(i)       ((int) ((short) (i)))
  66 #define intToY(i)       (GetHighWord(i))
  67 #endif
  68
  69 #endif                          /* _MICOORD_H_ */