qint.h
Go to the documentation of this file.00001 /* 00002 Copyright (C) 1998-2000 by Andrew Zabolotny 00003 00004 This library is free software; you can redistribute it and/or 00005 modify it under the terms of the GNU Library General Public 00006 License as published by the Free Software Foundation; either 00007 version 2 of the License, or (at your option) any later version. 00008 00009 This library is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 Library General Public License for more details. 00013 00014 You should have received a copy of the GNU Library General Public 00015 License along with this library; if not, write to the Free 00016 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00017 */ 00018 00019 #ifndef __CS_QINT_H__ 00020 #define __CS_QINT_H__ 00021 00022 #if defined (CS_IEEE_DOUBLE_FORMAT) 00023 00110 #ifdef CS_BIG_ENDIAN 00111 # define CS_LOWER_WORD_BYTE 4 00112 #else 00113 # define CS_LOWER_WORD_BYTE 0 00114 #endif 00115 00116 #define CS_LONG_AT_BYTE(x,b) *(long *)(((char *)&x) + b) 00117 00124 #define FIST_MAGIC_QINT (65536.0 * 65536.0 * 16.0) 00125 00132 #ifdef CS_QINT_WORKAROUND 00133 static inline long QInt (double inval) 00134 { 00135 union { double dtemp; long result; } x; 00136 00137 x.dtemp = FIST_MAGIC_QINT + inval; 00138 x.result = CS_LONG_AT_BYTE (x.dtemp, 2); 00139 return x.result < 0 ? (x.result >> 1) + 1 : x.result; 00140 } 00141 #else 00142 static inline long QInt (double inval) 00143 { 00144 double dtemp = FIST_MAGIC_QINT + inval; 00145 // Note that on both low-endian (x86) and big-endian (m68k) we have 00146 // to shift by two bytes. So no need for an #ifdef. 00147 long result = CS_LONG_AT_BYTE (dtemp, 2); 00148 return result < 0 ? (result >> 1) + 1 : result; 00149 } 00150 #endif 00151 00156 #define FIST_MAGIC_QROUND (((65536.0 * 65536.0 * 16.0) + (65536.0 * 0.5)) * 65536.0) 00157 00161 static inline long QRound (double inval) 00162 { 00163 double dtemp = FIST_MAGIC_QROUND + inval; 00164 return CS_LONG_AT_BYTE (dtemp, CS_LOWER_WORD_BYTE) - 0x80000000; 00165 } 00166 00171 #define FIST_MAGIC_QINT8 (((65536.0 * 16.0) + 0.5) * 65536.0 * 256.0) 00172 00174 inline long QInt8 (float inval) 00175 { 00176 double dtemp = FIST_MAGIC_QINT8 + inval; 00177 return CS_LONG_AT_BYTE (dtemp, CS_LOWER_WORD_BYTE) - 0x80000000; 00178 } 00179 00184 #define FIST_MAGIC_QINT16 (((65536.0 * 16.0) + 0.5) * 65536.0) 00185 00187 inline long QInt16 (float inval) 00188 { 00189 double dtemp = FIST_MAGIC_QINT16 + inval; 00190 return CS_LONG_AT_BYTE (dtemp, CS_LOWER_WORD_BYTE) - 0x80000000; 00191 } 00192 00197 #define FIST_MAGIC_QINT24 (((65536.0 * 16.0) + 0.5) * 256.0) 00198 00200 inline long QInt24 (float inval) 00201 { 00202 double dtemp = FIST_MAGIC_QINT24 + inval; 00203 return CS_LONG_AT_BYTE (dtemp, CS_LOWER_WORD_BYTE) - 0x80000000; 00204 } 00205 00208 #else /* not CS_IEEE_DOUBLE_FORMAT */ 00209 00210 #define QRound(x) (int ((x) + ((x < 0) ? -0.5 : +0.5))) 00211 #define QInt(x) (int (x)) 00212 #define QInt8(x) (int ((x)*256.)) 00213 #define QInt16(x) (int ((x)*65536.)) 00214 #define QInt24(x) (int ((x)*16777216.)) 00215 00216 #endif /* CS_IEEE_DOUBLE_FORMAT */ 00217 00218 #endif // __CS_QINT_H__
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