Here you can find the source of copy(Buffer src, Buffer dst, int numElements)
| Parameter | Description |
|---|---|
| src | the source Buffer. |
| dst | the destination Buffer. |
| numElements | the number of elements to copy. |
public static void copy(Buffer src, Buffer dst, int numElements)
/******************************************************************************* * Copyright 2011 See AUTHORS file./*w w w . j a va2 s . co m*/ * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. ******************************************************************************/ import java.nio.Buffer; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.CharBuffer; import java.nio.DoubleBuffer; import java.nio.FloatBuffer; import java.nio.IntBuffer; import java.nio.LongBuffer; import java.nio.ShortBuffer; public class Main{ /** Copies numFloats floats from src starting at offset to dst. Dst is assumed to be a direct {@link Buffer}. The method will * crash if that is not the case. The position and limit of the buffer are ignored, the copy is placed at position 0 in the * buffer. After the copying process the position of the buffer is set to 0 and its limit is set to numFloats * 4 if it is a * ByteBuffer and numFloats if it is a FloatBuffer. In case the Buffer is neither a ByteBuffer nor a FloatBuffer the limit is * not set. This is an expert method, use at your own risk. * * @param src the source array * @param dst the destination buffer, has to be a direct Buffer * @param numFloats the number of floats to copy * @param offset the offset in src to start copying from */ public static void copy(float[] src, Buffer dst, int numFloats, int offset) { copyJni(src, dst, numFloats, offset); dst.position(0); if (dst instanceof ByteBuffer) dst.limit(numFloats << 2); else if (dst instanceof FloatBuffer) dst.limit(numFloats); } /** Copies the contents of src to dst, starting from src[srcOffset], copying numElements elements. The {@link Buffer} instance's * {@link Buffer#position()} is used to define the offset into the Buffer itself. The position will stay the same, the limit * will be set to position + numElements. <b>The Buffer must be a direct Buffer with native byte order. No error checking is * performed</b>. * * @param src the source array. * @param srcOffset the offset into the source array. * @param dst the destination Buffer, its position is used as an offset. * @param numElements the number of elements to copy. */ public static void copy(byte[] src, int srcOffset, Buffer dst, int numElements) { copyJni(src, srcOffset, dst, positionInBytes(dst), numElements); dst.limit(dst.position() + bytesToElements(dst, numElements)); } /** Copies the contents of src to dst, starting from src[srcOffset], copying numElements elements. The {@link Buffer} instance's * {@link Buffer#position()} is used to define the offset into the Buffer itself. The position will stay the same, the limit * will be set to position + numElements. <b>The Buffer must be a direct Buffer with native byte order. No error checking is * performed</b>. * * @param src the source array. * @param srcOffset the offset into the source array. * @param dst the destination Buffer, its position is used as an offset. * @param numElements the number of elements to copy. */ public static void copy(short[] src, int srcOffset, Buffer dst, int numElements) { copyJni(src, srcOffset << 1, dst, positionInBytes(dst), numElements << 1); dst.limit(dst.position() + bytesToElements(dst, numElements << 1)); } /** Copies the contents of src to dst, starting from src[srcOffset], copying numElements elements. The {@link Buffer} instance's * {@link Buffer#position()} is used to define the offset into the Buffer itself. The position will stay the same, the limit * will be set to position + numElements. <b>The Buffer must be a direct Buffer with native byte order. No error checking is * performed</b>. * * @param src the source array. * @param srcOffset the offset into the source array. * @param dst the destination Buffer, its position is used as an offset. * @param numElements the number of elements to copy. */ public static void copy(char[] src, int srcOffset, Buffer dst, int numElements) { copyJni(src, srcOffset << 1, dst, positionInBytes(dst), numElements << 1); dst.limit(dst.position() + bytesToElements(dst, numElements << 1)); } /** Copies the contents of src to dst, starting from src[srcOffset], copying numElements elements. The {@link Buffer} instance's * {@link Buffer#position()} is used to define the offset into the Buffer itself. The position will stay the same, the limit * will be set to position + numElements. <b>The Buffer must be a direct Buffer with native byte order. No error checking is * performed</b>. * * @param src the source array. * @param srcOffset the offset into the source array. * @param dst the destination Buffer, its position is used as an offset. * @param numElements the number of elements to copy. */ public static void copy(int[] src, int srcOffset, Buffer dst, int numElements) { copyJni(src, srcOffset << 2, dst, positionInBytes(dst), numElements << 2); dst.limit(dst.position() + bytesToElements(dst, numElements << 2)); } /** Copies the contents of src to dst, starting from src[srcOffset], copying numElements elements. The {@link Buffer} instance's * {@link Buffer#position()} is used to define the offset into the Buffer itself. The position will stay the same, the limit * will be set to position + numElements. <b>The Buffer must be a direct Buffer with native byte order. No error checking is * performed</b>. * * @param src the source array. * @param srcOffset the offset into the source array. * @param dst the destination Buffer, its position is used as an offset. * @param numElements the number of elements to copy. */ public static void copy(long[] src, int srcOffset, Buffer dst, int numElements) { copyJni(src, srcOffset << 3, dst, positionInBytes(dst), numElements << 3); dst.limit(dst.position() + bytesToElements(dst, numElements << 3)); } /** Copies the contents of src to dst, starting from src[srcOffset], copying numElements elements. The {@link Buffer} instance's * {@link Buffer#position()} is used to define the offset into the Buffer itself. The position will stay the same, the limit * will be set to position + numElements. <b>The Buffer must be a direct Buffer with native byte order. No error checking is * performed</b>. * * @param src the source array. * @param srcOffset the offset into the source array. * @param dst the destination Buffer, its position is used as an offset. * @param numElements the number of elements to copy. */ public static void copy(float[] src, int srcOffset, Buffer dst, int numElements) { copyJni(src, srcOffset << 2, dst, positionInBytes(dst), numElements << 2); dst.limit(dst.position() + bytesToElements(dst, numElements << 2)); } /** Copies the contents of src to dst, starting from src[srcOffset], copying numElements elements. The {@link Buffer} instance's * {@link Buffer#position()} is used to define the offset into the Buffer itself. The position will stay the same, the limit * will be set to position + numElements. <b>The Buffer must be a direct Buffer with native byte order. No error checking is * performed</b>. * * @param src the source array. * @param srcOffset the offset into the source array. * @param dst the destination Buffer, its position is used as an offset. * @param numElements the number of elements to copy. */ public static void copy(double[] src, int srcOffset, Buffer dst, int numElements) { copyJni(src, srcOffset << 3, dst, positionInBytes(dst), numElements << 3); dst.limit(dst.position() + bytesToElements(dst, numElements << 3)); } /** Copies the contents of src to dst, starting from the current position of src, copying numElements elements (using the data * type of src, no matter the datatype of dst). The dst {@link Buffer#position()} is used as the writing offset. The position * of both Buffers will stay the same. The limit of the src Buffer will stay the same. The limit of the dst Buffer will be set * to dst.position() + numElements, where numElements are translated to the number of elements appropriate for the dst Buffer * data type. <b>The Buffers must be direct Buffers with native byte order. No error checking is performed</b>. * * @param src the source Buffer. * @param dst the destination Buffer. * @param numElements the number of elements to copy. */ public static void copy(Buffer src, Buffer dst, int numElements) { int numBytes = elementsToBytes(src, numElements); copyJni(src, positionInBytes(src), dst, positionInBytes(dst), numBytes); dst.limit(dst.position() + bytesToElements(dst, numBytes)); } private native static void copyJni(float[] src, Buffer dst, int numFloats, int offset); private native static void copyJni(byte[] src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private native static void copyJni(char[] src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private native static void copyJni(short[] src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private native static void copyJni(int[] src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private native static void copyJni(long[] src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private native static void copyJni(float[] src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private native static void copyJni(double[] src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private native static void copyJni(Buffer src, int srcOffset, Buffer dst, int dstOffset, int numBytes); private static int positionInBytes(Buffer dst) { if (dst instanceof ByteBuffer) return dst.position(); else if (dst instanceof ShortBuffer) return dst.position() << 1; else if (dst instanceof CharBuffer) return dst.position() << 1; else if (dst instanceof IntBuffer) return dst.position() << 2; else if (dst instanceof LongBuffer) return dst.position() << 3; else if (dst instanceof FloatBuffer) return dst.position() << 2; else if (dst instanceof DoubleBuffer) return dst.position() << 3; else throw new GdxRuntimeException("Can't copy to a " + dst.getClass().getName() + " instance"); } private static int bytesToElements(Buffer dst, int bytes) { if (dst instanceof ByteBuffer) return bytes; else if (dst instanceof ShortBuffer) return bytes >>> 1; else if (dst instanceof CharBuffer) return bytes >>> 1; else if (dst instanceof IntBuffer) return bytes >>> 2; else if (dst instanceof LongBuffer) return bytes >>> 3; else if (dst instanceof FloatBuffer) return bytes >>> 2; else if (dst instanceof DoubleBuffer) return bytes >>> 3; else throw new GdxRuntimeException("Can't copy to a " + dst.getClass().getName() + " instance"); } private static int elementsToBytes(Buffer dst, int elements) { if (dst instanceof ByteBuffer) return elements; else if (dst instanceof ShortBuffer) return elements << 1; else if (dst instanceof CharBuffer) return elements << 1; else if (dst instanceof IntBuffer) return elements << 2; else if (dst instanceof LongBuffer) return elements << 3; else if (dst instanceof FloatBuffer) return elements << 2; else if (dst instanceof DoubleBuffer) return elements << 3; else throw new GdxRuntimeException("Can't copy to a " + dst.getClass().getName() + " instance"); } }