| 1 | /* $XFree86: xc/programs/Xserver/mi/micoord.h,v 1.7 2003/10/29 22:57:48 tsi Exp $ */
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| 2 | /*
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| 3 | * Copyright (C) 2000 The XFree86 Project, Inc. All Rights Reserved.
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| 4 | *
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| 5 | * Permission is hereby granted, free of charge, to any person obtaining a copy
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| 6 | * of this software and associated documentation files (the "Software"), to
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| 7 | * deal in the Software without restriction, including without limitation the
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| 8 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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| 9 | * sell copies of the Software, and to permit persons to whom the Software is
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| 10 | * furnished to do so, subject to the following conditions:
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| 11 | *
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| 12 | * The above copyright notice and this permission notice shall be included in
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| 13 | * all copies or substantial portions of the Software.
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| 14 | *
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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| 18 | * XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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| 19 | * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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| 20 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 21 | *
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| 22 | * Except as contained in this notice, the name of the XFree86 Project shall
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| 23 | * not be used in advertising or otherwise to promote the sale, use or other
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| 24 | * dealings in this Software without prior written authorization from the
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| 25 | * XFree86 Project.
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| 26 | *
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| 27 | */
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| 28 |
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| 29 | #ifndef _MICOORD_H_
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| 30 | #define _MICOORD_H_ 1
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| 31 |
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| 32 | #include "servermd.h"
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| 33 |
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| 34 | /* Macros which handle a coordinate in a single register */
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| 35 |
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| 36 | /*
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| 37 | * Most compilers will convert divisions by 65536 into shifts, if signed
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| 38 | * shifts exist. If your machine does arithmetic shifts and your compiler
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| 39 | * can't get it right, add to this line.
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| 40 | */
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| 41 |
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| 42 | /*
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| 43 | * mips compiler - what a joke - it CSEs the 65536 constant into a reg
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| 44 | * forcing as to use div instead of shift. Let's be explicit.
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| 45 | */
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| 46 |
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| 47 | #if defined(mips) || defined(sgi) || \
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| 48 | defined(sparc) || defined(__sparc64__) || \
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| 49 | defined(__alpha) || defined(__alpha__) || \
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| 50 | defined(__i386__) || defined(i386) || \
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| 51 | defined(__ia64__) || defined(ia64) || \
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| 52 | defined(__s390x__) || defined(__s390__) || \
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| 53 | defined(__amd64__) || defined(amd64) || defined(__amd64)
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| 54 | #define GetHighWord(x) (((int) (x)) >> 16)
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| 55 | #else
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| 56 | #define GetHighWord(x) (((int) (x)) / 65536)
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| 57 | #endif
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| 58 |
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| 59 | #if IMAGE_BYTE_ORDER == MSBFirst
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| 60 | #define intToCoord(i,x,y) (((x) = GetHighWord(i)), ((y) = (int) ((short) (i))))
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| 61 | #define coordToInt(x,y) (((x) << 16) | ((y) & 0xffff))
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| 62 | #define intToX(i) (GetHighWord(i))
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| 63 | #define intToY(i) ((int) ((short) i))
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| 64 | #else
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| 65 | #define intToCoord(i,x,y) (((x) = (int) ((short) (i))), ((y) = GetHighWord(i)))
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| 66 | #define coordToInt(x,y) (((y) << 16) | ((x) & 0xffff))
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| 67 | #define intToX(i) ((int) ((short) (i)))
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| 68 | #define intToY(i) (GetHighWord(i))
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| 69 | #endif
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| 70 |
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| 71 | #endif /* _MICOORD_H_ */
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