< prev index next >
openjfx9/modules/javafx.graphics/src/main/java/com/sun/marlin/FloatMath.java
Print this page
*** 20,32 ****
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
- package sun.java2d.marlin;
! import jdk.internal.math.FloatConsts;
/**
* Faster Math ceil / floor routines derived from StrictMath
*/
public final class FloatMath implements MarlinConst {
--- 20,31 ----
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
! package com.sun.marlin;
/**
* Faster Math ceil / floor routines derived from StrictMath
*/
public final class FloatMath implements MarlinConst {
*** 43,178 ****
static float max(final float a, final float b) {
// no NaN handling
return (a >= b) ? a : b;
}
! static int max(final int a, final int b) {
return (a >= b) ? a : b;
}
! static int min(final int a, final int b) {
return (a <= b) ? a : b;
}
/**
- * Returns the smallest (closest to negative infinity) {@code float} value
- * that is greater than or equal to the argument and is equal to a
- * mathematical integer. Special cases:
- * <ul><li>If the argument value is already equal to a mathematical integer,
- * then the result is the same as the argument. <li>If the argument is NaN
- * or an infinity or positive zero or negative zero, then the result is the
- * same as the argument. <li>If the argument value is less than zero but
- * greater than -1.0, then the result is negative zero.</ul> Note that the
- * value of {@code StrictMath.ceil(x)} is exactly the value of
- * {@code -StrictMath.floor(-x)}.
- *
- * @param a a value.
- * @return the smallest (closest to negative infinity) floating-point value
- * that is greater than or equal to the argument and is equal to a
- * mathematical integer.
- */
- public static float ceil_f(final float a) {
- // Derived from StrictMath.ceil(double):
-
- // Inline call to Math.getExponent(a) to
- // compute only once Float.floatToRawIntBits(a)
- final int doppel = Float.floatToRawIntBits(a);
-
- final int exponent = ((doppel & FloatConsts.EXP_BIT_MASK)
- >> (FloatConsts.SIGNIFICAND_WIDTH - 1))
- - FloatConsts.EXP_BIAS;
-
- if (exponent < 0) {
- /*
- * Absolute value of argument is less than 1.
- * floorOrceil(-0.0) => -0.0
- * floorOrceil(+0.0) => +0.0
- */
- return ((a == 0) ? a :
- ( (a < 0f) ? -0f : 1f) );
- }
- if (CHECK_OVERFLOW && (exponent >= 23)) { // 52 for double
- /*
- * Infinity, NaN, or a value so large it must be integral.
- */
- return a;
- }
- // Else the argument is either an integral value already XOR it
- // has to be rounded to one.
- assert exponent >= 0 && exponent <= 22; // 51 for double
-
- final int intpart = doppel
- & (~(FloatConsts.SIGNIF_BIT_MASK >> exponent));
-
- if (intpart == doppel) {
- return a; // integral value (including 0)
- }
-
- // 0 handled above as an integer
- // sign: 1 for negative, 0 for positive numbers
- // add : 0 for negative and 1 for positive numbers
- return Float.intBitsToFloat(intpart) + ((~intpart) >>> 31);
- }
-
- /**
- * Returns the largest (closest to positive infinity) {@code float} value
- * that is less than or equal to the argument and is equal to a mathematical
- * integer. Special cases:
- * <ul><li>If the argument value is already equal to a mathematical integer,
- * then the result is the same as the argument. <li>If the argument is NaN
- * or an infinity or positive zero or negative zero, then the result is the
- * same as the argument.</ul>
- *
- * @param a a value.
- * @return the largest (closest to positive infinity) floating-point value
- * that less than or equal to the argument and is equal to a mathematical
- * integer.
- */
- public static float floor_f(final float a) {
- // Derived from StrictMath.floor(double):
-
- // Inline call to Math.getExponent(a) to
- // compute only once Float.floatToRawIntBits(a)
- final int doppel = Float.floatToRawIntBits(a);
-
- final int exponent = ((doppel & FloatConsts.EXP_BIT_MASK)
- >> (FloatConsts.SIGNIFICAND_WIDTH - 1))
- - FloatConsts.EXP_BIAS;
-
- if (exponent < 0) {
- /*
- * Absolute value of argument is less than 1.
- * floorOrceil(-0.0) => -0.0
- * floorOrceil(+0.0) => +0.0
- */
- return ((a == 0) ? a :
- ( (a < 0f) ? -1f : 0f) );
- }
- if (CHECK_OVERFLOW && (exponent >= 23)) { // 52 for double
- /*
- * Infinity, NaN, or a value so large it must be integral.
- */
- return a;
- }
- // Else the argument is either an integral value already XOR it
- // has to be rounded to one.
- assert exponent >= 0 && exponent <= 22; // 51 for double
-
- final int intpart = doppel
- & (~(FloatConsts.SIGNIF_BIT_MASK >> exponent));
-
- if (intpart == doppel) {
- return a; // integral value (including 0)
- }
-
- // 0 handled above as an integer
- // sign: 1 for negative, 0 for positive numbers
- // add : -1 for negative and 0 for positive numbers
- return Float.intBitsToFloat(intpart) + (intpart >> 31);
- }
-
- /**
* Faster alternative to ceil(float) optimized for the integer domain
* and supporting NaN and +/-Infinity.
*
* @param a a value.
* @return the largest (closest to positive infinity) integer value
--- 42,60 ----
static float max(final float a, final float b) {
// no NaN handling
return (a >= b) ? a : b;
}
! public static int max(final int a, final int b) {
return (a >= b) ? a : b;
}
! public static int min(final int a, final int b) {
return (a <= b) ? a : b;
}
/**
* Faster alternative to ceil(float) optimized for the integer domain
* and supporting NaN and +/-Infinity.
*
* @param a a value.
* @return the largest (closest to positive infinity) integer value
< prev index next >