src/jdk/nashorn/internal/objects/NativeUint8ClampedArray.java - platform/external/jetbrains/jdk8u_nashorn - Git at Google

 /*
  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * 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 jdk.nashorn.internal.objects;

 import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall;
 import static jdk.nashorn.internal.codegen.CompilerConstants.staticCall;
 import static jdk.nashorn.internal.lookup.Lookup.MH;

 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.nio.ByteBuffer;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Constructor;
 import jdk.nashorn.internal.objects.annotations.Function;
 import jdk.nashorn.internal.objects.annotations.Property;
 import jdk.nashorn.internal.objects.annotations.ScriptClass;
 import jdk.nashorn.internal.objects.annotations.Where;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.PropertyMap;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
 import jdk.nashorn.internal.runtime.arrays.TypedArrayData;

 /**
  * Uint8 clamped array for TypedArray extension
  */
 @ScriptClass("Uint8ClampedArray")
 public final class NativeUint8ClampedArray extends ArrayBufferView {
     /**
      * The size in bytes of each element in the array.
      */
     @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR)
     public static final int BYTES_PER_ELEMENT = 1;

     // initialized by nasgen
     @SuppressWarnings("unused")
     private static PropertyMap $nasgenmap$;

     private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) {
         @Override
         public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
             return new NativeUint8ClampedArray(buffer, byteOffset, length);
         }

         @Override
         public Uint8ClampedArrayData createArrayData(final ByteBuffer nb, final int start, final int end) {
             return new Uint8ClampedArrayData(nb, start, end);
         }

         @Override
         public String getClassName() {
             return "Uint8ClampedArray";
         }
     };

     private static final class Uint8ClampedArrayData extends TypedArrayData<ByteBuffer> {

         private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "getElem", int.class, int.class).methodHandle();
         private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "setElem", void.class, int.class, int.class).methodHandle();
         private static final MethodHandle RINT_D   = staticCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "rint", double.class, double.class).methodHandle();
         private static final MethodHandle RINT_O   = staticCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "rint", Object.class, Object.class).methodHandle();
         private static final MethodHandle CLAMP_LONG = staticCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "clampLong", long.class, long.class).methodHandle();

         private Uint8ClampedArrayData(final ByteBuffer nb, final int start, final int end) {
             super(((ByteBuffer)nb.position(start).limit(end)).slice(), end - start);
         }

         @Override
         protected MethodHandle getGetElem() {
             return GET_ELEM;
         }

         @Override
         protected MethodHandle getSetElem() {
             return SET_ELEM;
         }

         @Override
         public Class<?> getElementType() {
             return int.class;
         }

         @Override
         public Class<?> getBoxedElementType() {
             return int.class;
         }

         private int getElem(final int index) {
             try {
                 return nb.get(index) & 0xff;
             } catch (final IndexOutOfBoundsException e) {
                 throw new ClassCastException(); //force relink - this works for unoptimistic too
             }
         }

         @Override
         public MethodHandle getElementSetter(final Class<?> elementType) {
             final MethodHandle setter = super.getElementSetter(elementType); //getContinuousElementSetter(getClass(), setElem(), elementType);
             if (setter != null) {
                 if (elementType == Object.class) {
                     return MH.filterArguments(setter, 2, RINT_O);
                 } else if (elementType == double.class) {
                     return MH.filterArguments(setter, 2, RINT_D);
                 } else if (elementType == long.class) {
                     return MH.filterArguments(setter, 2, CLAMP_LONG);
                 }
             }
             return setter;
         }

         private void setElem(final int index, final int elem) {
             try {
                 if (index < nb.limit()) {
                     final byte clamped;
                     if ((elem & 0xffff_ff00) == 0) {
                         clamped = (byte) elem;
                     } else {
                         clamped = elem < 0 ? 0 : (byte) 0xff;
                     }
                     nb.put(index, clamped);
                 }
             } catch (final IndexOutOfBoundsException e) {
                 throw new ClassCastException();
             }
         }

         @Override
         public boolean isClamped() {
             return true;
         }

         @Override
         public boolean isUnsigned() {
             return true;
         }

         @Override
         public int getInt(final int index) {
             return getElem(index);
         }

         @Override
         public int getIntOptimistic(final int index, final int programPoint) {
             return getElem(index);
         }

         @Override
         public double getDouble(final int index) {
             return getInt(index);
         }

         @Override
         public double getDoubleOptimistic(final int index, final int programPoint) {
             return getElem(index);
         }

         @Override
         public Object getObject(final int index) {
             return getInt(index);
         }

         @Override
         public ArrayData set(final int index, final Object value, final boolean strict) {
             return set(index, JSType.toNumber(value), strict);
         }

         @Override
         public ArrayData set(final int index, final int value, final boolean strict) {
             setElem(index, value);
             return this;
         }

         @Override
         public ArrayData set(final int index, final double value, final boolean strict) {
             return set(index, rint(value), strict);
         }

         private static double rint(final double rint) {
             return (int)Math.rint(rint);
         }

         @SuppressWarnings("unused")
         private static Object rint(final Object rint) {
             return rint(JSType.toNumber(rint));
         }

         @SuppressWarnings("unused")
         private static long clampLong(final long l) {
             if(l < 0L) {
                 return 0L;
             } else if(l > 0xffL) {
                 return 0xffL;
             }
             return l;
         }
     }

     /**
      * Constructor
      *
      * @param newObj is this typed array instantiated with the new operator
      * @param self   self reference
      * @param args   args
      *
      * @return new typed array
      */
     @Constructor(arity = 1)
     public static NativeUint8ClampedArray constructor(final boolean newObj, final Object self, final Object... args) {
         return (NativeUint8ClampedArray)constructorImpl(newObj, args, FACTORY);
     }

     NativeUint8ClampedArray(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
         super(buffer, byteOffset, length);
     }

     @Override
     protected Factory factory() {
         return FACTORY;
     }

     /**
      * Set values
      * @param self   self reference
      * @param array  multiple values of array's type to set
      * @param offset optional start index, interpreted  0 if undefined
      * @return undefined
      */
     @Function(attributes = Attribute.NOT_ENUMERABLE)
     protected static Object set(final Object self, final Object array, final Object offset) {
         return ArrayBufferView.setImpl(self, array, offset);
     }

     /**
      * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
      * referencing the elements at begin, inclusive, up to end, exclusive. If either
      * begin or end is negative, it refers to an index from the end of the array,
      * as opposed to from the beginning.
      * <p>
      * If end is unspecified, the subarray contains all elements from begin to the end
      * of the TypedArray. The range specified by the begin and end values is clamped to
      * the valid index range for the current array. If the computed length of the new
      * TypedArray would be negative, it is clamped to zero.
      * <p>
      * The returned TypedArray will be of the same type as the array on which this
      * method is invoked.
      *
      * @param self self reference
      * @param begin begin position
      * @param end end position
      *
      * @return sub array
      */
     @Function(attributes = Attribute.NOT_ENUMERABLE)
     protected static NativeUint8ClampedArray subarray(final Object self, final Object begin, final Object end) {
         return (NativeUint8ClampedArray)ArrayBufferView.subarrayImpl(self, begin, end);
     }

     @Override
     protected ScriptObject getPrototype(final Global global) {
         return global.getUint8ClampedArrayPrototype();
     }
 }
	/*
	* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* 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 jdk.nashorn.internal.objects;

	import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall;
	import static jdk.nashorn.internal.codegen.CompilerConstants.staticCall;
	import static jdk.nashorn.internal.lookup.Lookup.MH;

	import java.lang.invoke.MethodHandle;
	import java.lang.invoke.MethodHandles;
	import java.nio.ByteBuffer;
	import jdk.nashorn.internal.objects.annotations.Attribute;
	import jdk.nashorn.internal.objects.annotations.Constructor;
	import jdk.nashorn.internal.objects.annotations.Function;
	import jdk.nashorn.internal.objects.annotations.Property;
	import jdk.nashorn.internal.objects.annotations.ScriptClass;
	import jdk.nashorn.internal.objects.annotations.Where;
	import jdk.nashorn.internal.runtime.JSType;
	import jdk.nashorn.internal.runtime.PropertyMap;
	import jdk.nashorn.internal.runtime.ScriptObject;
	import jdk.nashorn.internal.runtime.arrays.ArrayData;
	import jdk.nashorn.internal.runtime.arrays.TypedArrayData;

	/**
	* Uint8 clamped array for TypedArray extension
	*/
	@ScriptClass("Uint8ClampedArray")
	public final class NativeUint8ClampedArray extends ArrayBufferView {
	/**
	* The size in bytes of each element in the array.
	*/
	@Property(attributes = Attribute.NOT_ENUMERABLE \| Attribute.NOT_WRITABLE \| Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR)
	public static final int BYTES_PER_ELEMENT = 1;

	// initialized by nasgen
	@SuppressWarnings("unused")
	private static PropertyMap $nasgenmap$;

	private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) {
	@Override
	public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
	return new NativeUint8ClampedArray(buffer, byteOffset, length);
	}

	@Override
	public Uint8ClampedArrayData createArrayData(final ByteBuffer nb, final int start, final int end) {
	return new Uint8ClampedArrayData(nb, start, end);
	}

	@Override
	public String getClassName() {
	return "Uint8ClampedArray";
	}
	};

	private static final class Uint8ClampedArrayData extends TypedArrayData<ByteBuffer> {

	private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "getElem", int.class, int.class).methodHandle();
	private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "setElem", void.class, int.class, int.class).methodHandle();
	private static final MethodHandle RINT_D = staticCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "rint", double.class, double.class).methodHandle();
	private static final MethodHandle RINT_O = staticCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "rint", Object.class, Object.class).methodHandle();
	private static final MethodHandle CLAMP_LONG = staticCall(MethodHandles.lookup(), Uint8ClampedArrayData.class, "clampLong", long.class, long.class).methodHandle();

	private Uint8ClampedArrayData(final ByteBuffer nb, final int start, final int end) {
	super(((ByteBuffer)nb.position(start).limit(end)).slice(), end - start);
	}

	@Override
	protected MethodHandle getGetElem() {
	return GET_ELEM;
	}

	@Override
	protected MethodHandle getSetElem() {
	return SET_ELEM;
	}

	@Override
	public Class<?> getElementType() {
	return int.class;
	}

	@Override
	public Class<?> getBoxedElementType() {
	return int.class;
	}

	private int getElem(final int index) {
	try {
	return nb.get(index) & 0xff;
	} catch (final IndexOutOfBoundsException e) {
	throw new ClassCastException(); //force relink - this works for unoptimistic too
	}
	}

	@Override
	public MethodHandle getElementSetter(final Class<?> elementType) {
	final MethodHandle setter = super.getElementSetter(elementType); //getContinuousElementSetter(getClass(), setElem(), elementType);
	if (setter != null) {
	if (elementType == Object.class) {
	return MH.filterArguments(setter, 2, RINT_O);
	} else if (elementType == double.class) {
	return MH.filterArguments(setter, 2, RINT_D);
	} else if (elementType == long.class) {
	return MH.filterArguments(setter, 2, CLAMP_LONG);
	}
	}
	return setter;
	}

	private void setElem(final int index, final int elem) {
	try {
	if (index < nb.limit()) {
	final byte clamped;
	if ((elem & 0xffff_ff00) == 0) {
	clamped = (byte) elem;
	} else {
	clamped = elem < 0 ? 0 : (byte) 0xff;
	}
	nb.put(index, clamped);
	}
	} catch (final IndexOutOfBoundsException e) {
	throw new ClassCastException();
	}
	}

	@Override
	public boolean isClamped() {
	return true;
	}

	@Override
	public boolean isUnsigned() {
	return true;
	}

	@Override
	public int getInt(final int index) {
	return getElem(index);
	}

	@Override
	public int getIntOptimistic(final int index, final int programPoint) {
	return getElem(index);
	}

	@Override
	public double getDouble(final int index) {
	return getInt(index);
	}

	@Override
	public double getDoubleOptimistic(final int index, final int programPoint) {
	return getElem(index);
	}

	@Override
	public Object getObject(final int index) {
	return getInt(index);
	}

	@Override
	public ArrayData set(final int index, final Object value, final boolean strict) {
	return set(index, JSType.toNumber(value), strict);
	}

	@Override
	public ArrayData set(final int index, final int value, final boolean strict) {
	setElem(index, value);
	return this;
	}

	@Override
	public ArrayData set(final int index, final double value, final boolean strict) {
	return set(index, rint(value), strict);
	}

	private static double rint(final double rint) {
	return (int)Math.rint(rint);
	}

	@SuppressWarnings("unused")
	private static Object rint(final Object rint) {
	return rint(JSType.toNumber(rint));
	}

	@SuppressWarnings("unused")
	private static long clampLong(final long l) {
	if(l < 0L) {
	return 0L;
	} else if(l > 0xffL) {
	return 0xffL;
	}
	return l;
	}
	}

	/**
	* Constructor
	*
	* @param newObj is this typed array instantiated with the new operator
	* @param self self reference
	* @param args args
	*
	* @return new typed array
	*/
	@Constructor(arity = 1)
	public static NativeUint8ClampedArray constructor(final boolean newObj, final Object self, final Object... args) {
	return (NativeUint8ClampedArray)constructorImpl(newObj, args, FACTORY);
	}

	NativeUint8ClampedArray(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
	super(buffer, byteOffset, length);
	}

	@Override
	protected Factory factory() {
	return FACTORY;
	}

	/**
	* Set values
	* @param self self reference
	* @param array multiple values of array's type to set
	* @param offset optional start index, interpreted 0 if undefined
	* @return undefined
	*/
	@Function(attributes = Attribute.NOT_ENUMERABLE)
	protected static Object set(final Object self, final Object array, final Object offset) {
	return ArrayBufferView.setImpl(self, array, offset);
	}

	/**
	* Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
	* referencing the elements at begin, inclusive, up to end, exclusive. If either
	* begin or end is negative, it refers to an index from the end of the array,
	* as opposed to from the beginning.
	* <p>
	* If end is unspecified, the subarray contains all elements from begin to the end
	* of the TypedArray. The range specified by the begin and end values is clamped to
	* the valid index range for the current array. If the computed length of the new
	* TypedArray would be negative, it is clamped to zero.
	* <p>
	* The returned TypedArray will be of the same type as the array on which this
	* method is invoked.
	*
	* @param self self reference
	* @param begin begin position
	* @param end end position
	*
	* @return sub array
	*/
	@Function(attributes = Attribute.NOT_ENUMERABLE)
	protected static NativeUint8ClampedArray subarray(final Object self, final Object begin, final Object end) {
	return (NativeUint8ClampedArray)ArrayBufferView.subarrayImpl(self, begin, end);
	}

	@Override
	protected ScriptObject getPrototype(final Global global) {
	return global.getUint8ClampedArrayPrototype();
	}
	}