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src/java.desktop/share/classes/sun/java2d/marlin/FloatMath.java

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   1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.java2d.marlin;
  26 
  27 import jdk.internal.math.DoubleConsts;
  28 import jdk.internal.math.FloatConsts;
  29 
  30 /**
  31  * Faster Math ceil / floor routines derived from StrictMath
  32  */
  33 public final class FloatMath implements MarlinConst {
  34 
  35     // overflow / NaN handling enabled:
  36     static final boolean CHECK_OVERFLOW = true;
  37     static final boolean CHECK_NAN = true;
  38 
  39     private FloatMath() {
  40         // utility class
  41     }
  42 
  43     // faster inlined min/max functions in the branch prediction is high
  44     static float max(final float a, final float b) {
  45         // no NaN handling
  46         return (a >= b) ? a : b;
  47     }


 192     }
 193 
 194     /**
 195      * Faster alternative to floor(float) optimized for the integer domain
 196      * and supporting NaN and +/-Infinity.
 197      *
 198      * @param a a value.
 199      * @return the largest (closest to positive infinity) floating-point value
 200      * that less than or equal to the argument and is equal to a mathematical
 201      * integer.
 202      */
 203     public static int floor_int(final float a) {
 204         final int intpart = (int) a;
 205 
 206         if (a >= intpart
 207                 || (CHECK_OVERFLOW && intpart == Integer.MIN_VALUE)
 208                 || CHECK_NAN && Float.isNaN(a)) {
 209             return intpart;
 210         }
 211         return intpart - 1;
 212     }
 213 
 214     /**
 215      * Returns a floating-point power of two in the normal range.
 216      */
 217     static double powerOfTwoD(int n) {
 218         assert (n >= DoubleConsts.MIN_EXPONENT && n <= DoubleConsts.MAX_EXPONENT);
 219         return Double.longBitsToDouble((((long) n + (long) DoubleConsts.EXP_BIAS)
 220                 << (DoubleConsts.SIGNIFICAND_WIDTH - 1))
 221                 & DoubleConsts.EXP_BIT_MASK);
 222     }
 223 }
   1 /*
   2  * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.java2d.marlin;
  26 

  27 import jdk.internal.math.FloatConsts;
  28 
  29 /**
  30  * Faster Math ceil / floor routines derived from StrictMath
  31  */
  32 public final class FloatMath implements MarlinConst {
  33 
  34     // overflow / NaN handling enabled:
  35     static final boolean CHECK_OVERFLOW = true;
  36     static final boolean CHECK_NAN = true;
  37 
  38     private FloatMath() {
  39         // utility class
  40     }
  41 
  42     // faster inlined min/max functions in the branch prediction is high
  43     static float max(final float a, final float b) {
  44         // no NaN handling
  45         return (a >= b) ? a : b;
  46     }


 191     }
 192 
 193     /**
 194      * Faster alternative to floor(float) optimized for the integer domain
 195      * and supporting NaN and +/-Infinity.
 196      *
 197      * @param a a value.
 198      * @return the largest (closest to positive infinity) floating-point value
 199      * that less than or equal to the argument and is equal to a mathematical
 200      * integer.
 201      */
 202     public static int floor_int(final float a) {
 203         final int intpart = (int) a;
 204 
 205         if (a >= intpart
 206                 || (CHECK_OVERFLOW && intpart == Integer.MIN_VALUE)
 207                 || CHECK_NAN && Float.isNaN(a)) {
 208             return intpart;
 209         }
 210         return intpart - 1;










 211     }
 212 }
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