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Diffstat (limited to 'src/java/com/jogamp/common/util/ValueConv.java')
| -rw-r--r-- | src/java/com/jogamp/common/util/ValueConv.java | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/java/com/jogamp/common/util/ValueConv.java b/src/java/com/jogamp/common/util/ValueConv.java new file mode 100644 index 0000000..fa49341 --- /dev/null +++ b/src/java/com/jogamp/common/util/ValueConv.java @@ -0,0 +1,161 @@ +package com.jogamp.common.util; + +/** + * Copyright 2012 JogAmp Community. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, are + * permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this list of + * conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, this list + * of conditions and the following disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * The views and conclusions contained in the software and documentation are those of the + * authors and should not be interpreted as representing official policies, either expressed + * or implied, of JogAmp Community. + */ + +/** + * Utility class providing simple signed and unsigned primitive value conversions + * for byte, short, int, float and double. + * <p> + * Non float to non float conversions are handled via float or double, + * depending on the value range. + * </p> + */ +public class ValueConv { + public static final byte float_to_byte(float v, boolean dSigned) { + // lossy + if( dSigned ) { + return (byte) ( v * ( v > 0 ? 127.0f : 128.0f ) ); + } else { + return (byte) ( v * 255.0f ); + } + } + public static final short float_to_short(float v, boolean dSigned) { + if( dSigned ) { + return (short) ( v * ( v > 0 ? 32767.0f : 32768.0f ) ); + } else { + return (short) ( v * 65535.0f ); + } + } + public static final int float_to_int(float v, boolean dSigned) { + // float significand 0x007fffff + // double significand 0x000fffffffffffffL + // int min = 0x80000000 = -2147483648 + // int max = 0x7fffffff = +2147483647 + if( dSigned ) { + return (int) ( v * ( v > 0 ? 2147483647.0 : 2147483648.0 ) ); + } else { + return (int) (long) ( v * 4294967295.0 ); + } + } + + public static final byte double_to_byte(double v, boolean dSigned) { + // lossy + if( dSigned ) { + return (byte) ( v * ( v > 0 ? 127.0 : 128.0 ) ); + } else { + return (byte) ( v * 255.0 ); + } + } + public static final short double_to_short(double v, boolean dSigned) { + // lossy + if( dSigned ) { + return (short) ( v * ( v > 0 ? 32767.0 : 32768.0 ) ); + } else { + return (short) ( v * 65535.0 ); + } + } + public static final int double_to_int(double v, boolean dSigned) { + // lossy + if( dSigned ) { + return (int) ( v * ( v > 0 ? 2147483647.0 : 2147483648.0 ) ); + } else { + return (int) (long) ( v * 4294967295.0 ); + } + } + + public static final float byte_to_float(byte v, boolean sSigned) { + if( sSigned ) { + return (v & 0xff) / ( v > 0 ? 127.0f : -128.0f ) ; + } else { + return (v & 0xff) / 255.0f ; + } + } + public static final double byte_to_double(byte v, boolean sSigned) { + if( sSigned ) { + return (v & 0xff) / ( v > 0 ? 127.0 : -128.0 ) ; + } else { + return (v & 0xff) / 255.0 ; + } + } + public static final float short_to_float(short v, boolean sSigned) { + if( sSigned ) { + return (v & 0xffff) / ( v > 0 ? 32767.0f : -32768.0f ) ; + } else { + return (v & 0xffff) / 65535.0f ; + } + } + public static final double short_to_double(short v, boolean sSigned) { + // lossy + if( sSigned ) { + return (v & 0xffff) / ( v > 0 ? 32767.0 : -32768.0 ) ; + } else { + return (v & 0xffff) / 65535.0 ; + } + } + public static final float int_to_float(int v, boolean sSigned) { + // lossy + // float significand 0x007fffff + // double significand 0x000fffffffffffffL + // int min = 0x80000000 = -2147483648 + // int max = 0x7fffffff = +2147483647 + if( sSigned ) { + return (float) ( v / ( v > 0 ? 2147483647.0 : 2147483648.0 ) ); + } else { + return (float) ( ((long)v & 0xffffffffL) / 4294967295.0 ); + } + } + public static final double int_to_double(int v, boolean sSigned) { + if( sSigned ) { + return v / ( v > 0 ? 2147483647.0 : 2147483648.0 ) ; + } else { + return ((long)v & 0xffffffffL) / 4294967295.0 ; + } + } + + public static final short byte_to_short(byte v, boolean sSigned, boolean dSigned) { + return float_to_short(byte_to_float(v, sSigned), dSigned); + } + public static final int byte_to_int(byte v, boolean sSigned, boolean dSigned) { + return float_to_int(byte_to_float(v, sSigned), dSigned); + } + + public static final byte short_to_byte(short v, boolean sSigned, boolean dSigned) { + return float_to_byte(short_to_float(v, sSigned), dSigned); + } + public static final int short_to_int(short v, boolean sSigned, boolean dSigned) { + return float_to_int(short_to_float(v, sSigned), dSigned); + } + + public static final byte int_to_byte(int v, boolean sSigned, boolean dSigned) { + return float_to_byte(int_to_float(v, sSigned), dSigned); + } + public static final short int_to_short(int v, boolean sSigned, boolean dSigned) { + return float_to_short(int_to_float(v, sSigned), dSigned); + } +} |