author | dxu |
Thu, 04 Apr 2013 15:39:17 -0700 | |
changeset 16734 | da1901d79073 |
parent 12813 | c10ab96dcf41 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.java2d.pipe; |
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import sun.misc.Unsafe; |
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/** |
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* The RenderBuffer class is a simplified, high-performance, Unsafe wrapper |
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* used for buffering rendering operations in a single-threaded rendering |
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* environment. It's functionality is similar to the ByteBuffer and related |
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* NIO classes. However, the methods in this class perform little to no |
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* alignment or bounds checks for performance reasons. Therefore, it is |
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* the caller's responsibility to ensure that all put() calls are properly |
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* aligned and within bounds: |
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* - int and float values must be aligned on 4-byte boundaries |
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* - long and double values must be aligned on 8-byte boundaries |
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* |
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* This class only includes the bare minimum of methods to support |
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* single-threaded rendering. For example, there is no put(double[]) method |
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* because we currently have no need for such a method in the STR classes. |
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*/ |
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public class RenderBuffer { |
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/** |
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* These constants represent the size of various data types (in bytes). |
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*/ |
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protected static final long SIZEOF_BYTE = 1L; |
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protected static final long SIZEOF_SHORT = 2L; |
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protected static final long SIZEOF_INT = 4L; |
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protected static final long SIZEOF_FLOAT = 4L; |
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protected static final long SIZEOF_LONG = 8L; |
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protected static final long SIZEOF_DOUBLE = 8L; |
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/** |
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* Represents the number of elements at which we have empirically |
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* determined that the average cost of a JNI call exceeds the expense |
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* of an element by element copy. In other words, if the number of |
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* elements in an array to be copied exceeds this value, then we should |
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* use the copyFromArray() method to complete the bulk put operation. |
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* (This value can be adjusted if the cost of JNI downcalls is reduced |
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* in a future release.) |
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*/ |
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private static final int COPY_FROM_ARRAY_THRESHOLD = 6; |
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protected final Unsafe unsafe; |
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protected final long baseAddress; |
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protected final long endAddress; |
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protected long curAddress; |
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protected final int capacity; |
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protected RenderBuffer(int numBytes) { |
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unsafe = Unsafe.getUnsafe(); |
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curAddress = baseAddress = unsafe.allocateMemory(numBytes); |
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endAddress = baseAddress + numBytes; |
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capacity = numBytes; |
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} |
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/** |
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* Allocates a fresh buffer using the machine endianness. |
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*/ |
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public static RenderBuffer allocate(int numBytes) { |
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return new RenderBuffer(numBytes); |
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} |
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/** |
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* Returns the base address of the underlying memory buffer. |
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*/ |
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public final long getAddress() { |
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return baseAddress; |
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} |
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/** |
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* The behavior (and names) of the following methods are nearly |
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* identical to their counterparts in the various NIO Buffer classes. |
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*/ |
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public final int capacity() { |
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return capacity; |
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} |
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public final int remaining() { |
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return (int)(endAddress - curAddress); |
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} |
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public final int position() { |
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return (int)(curAddress - baseAddress); |
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} |
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public final void position(long numBytes) { |
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curAddress = baseAddress + numBytes; |
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} |
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public final void clear() { |
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curAddress = baseAddress; |
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} |
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public final RenderBuffer skip(long numBytes) { |
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curAddress += numBytes; |
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return this; |
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} |
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/** |
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* putByte() methods... |
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*/ |
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public final RenderBuffer putByte(byte x) { |
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unsafe.putByte(curAddress, x); |
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curAddress += SIZEOF_BYTE; |
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return this; |
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} |
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public RenderBuffer put(byte[] x) { |
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return put(x, 0, x.length); |
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} |
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public RenderBuffer put(byte[] x, int offset, int length) { |
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if (length > COPY_FROM_ARRAY_THRESHOLD) { |
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long offsetInBytes = offset * SIZEOF_BYTE + Unsafe.ARRAY_BYTE_BASE_OFFSET; |
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long lengthInBytes = length * SIZEOF_BYTE; |
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unsafe.copyMemory(x, offsetInBytes, null, curAddress, lengthInBytes); |
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position(position() + lengthInBytes); |
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} else { |
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int end = offset + length; |
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for (int i = offset; i < end; i++) { |
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putByte(x[i]); |
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} |
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} |
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return this; |
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} |
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/** |
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* putShort() methods... |
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*/ |
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public final RenderBuffer putShort(short x) { |
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// assert (position() % SIZEOF_SHORT == 0); |
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unsafe.putShort(curAddress, x); |
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curAddress += SIZEOF_SHORT; |
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return this; |
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} |
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public RenderBuffer put(short[] x) { |
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return put(x, 0, x.length); |
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} |
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public RenderBuffer put(short[] x, int offset, int length) { |
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// assert (position() % SIZEOF_SHORT == 0); |
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if (length > COPY_FROM_ARRAY_THRESHOLD) { |
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long offsetInBytes = offset * SIZEOF_SHORT + Unsafe.ARRAY_SHORT_BASE_OFFSET; |
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long lengthInBytes = length * SIZEOF_SHORT; |
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unsafe.copyMemory(x, offsetInBytes, null, curAddress, lengthInBytes); |
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position(position() + lengthInBytes); |
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} else { |
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int end = offset + length; |
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for (int i = offset; i < end; i++) { |
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putShort(x[i]); |
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} |
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} |
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return this; |
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} |
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/** |
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* putInt() methods... |
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*/ |
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public final RenderBuffer putInt(int pos, int x) { |
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// assert (baseAddress + pos % SIZEOF_INT == 0); |
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unsafe.putInt(baseAddress + pos, x); |
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return this; |
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} |
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public final RenderBuffer putInt(int x) { |
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// assert (position() % SIZEOF_INT == 0); |
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unsafe.putInt(curAddress, x); |
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curAddress += SIZEOF_INT; |
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return this; |
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} |
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public RenderBuffer put(int[] x) { |
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return put(x, 0, x.length); |
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} |
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public RenderBuffer put(int[] x, int offset, int length) { |
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// assert (position() % SIZEOF_INT == 0); |
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if (length > COPY_FROM_ARRAY_THRESHOLD) { |
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long offsetInBytes = offset * SIZEOF_INT + Unsafe.ARRAY_INT_BASE_OFFSET; |
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long lengthInBytes = length * SIZEOF_INT; |
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unsafe.copyMemory(x, offsetInBytes, null, curAddress, lengthInBytes); |
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position(position() + lengthInBytes); |
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} else { |
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int end = offset + length; |
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for (int i = offset; i < end; i++) { |
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putInt(x[i]); |
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} |
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} |
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return this; |
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} |
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/** |
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* putFloat() methods... |
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*/ |
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public final RenderBuffer putFloat(float x) { |
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// assert (position() % SIZEOF_FLOAT == 0); |
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unsafe.putFloat(curAddress, x); |
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curAddress += SIZEOF_FLOAT; |
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return this; |
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} |
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public RenderBuffer put(float[] x) { |
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return put(x, 0, x.length); |
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} |
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public RenderBuffer put(float[] x, int offset, int length) { |
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// assert (position() % SIZEOF_FLOAT == 0); |
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if (length > COPY_FROM_ARRAY_THRESHOLD) { |
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long offsetInBytes = offset * SIZEOF_FLOAT + Unsafe.ARRAY_FLOAT_BASE_OFFSET; |
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long lengthInBytes = length * SIZEOF_FLOAT; |
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unsafe.copyMemory(x, offsetInBytes, null, curAddress, lengthInBytes); |
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position(position() + lengthInBytes); |
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} else { |
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int end = offset + length; |
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for (int i = offset; i < end; i++) { |
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putFloat(x[i]); |
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} |
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} |
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return this; |
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} |
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/** |
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* putLong() methods... |
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*/ |
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public final RenderBuffer putLong(long x) { |
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// assert (position() % SIZEOF_LONG == 0); |
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unsafe.putLong(curAddress, x); |
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curAddress += SIZEOF_LONG; |
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return this; |
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} |
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public RenderBuffer put(long[] x) { |
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return put(x, 0, x.length); |
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} |
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public RenderBuffer put(long[] x, int offset, int length) { |
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// assert (position() % SIZEOF_LONG == 0); |
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if (length > COPY_FROM_ARRAY_THRESHOLD) { |
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long offsetInBytes = offset * SIZEOF_LONG + Unsafe.ARRAY_LONG_BASE_OFFSET; |
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long lengthInBytes = length * SIZEOF_LONG; |
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unsafe.copyMemory(x, offsetInBytes, null, curAddress, lengthInBytes); |
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position(position() + lengthInBytes); |
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} else { |
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int end = offset + length; |
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for (int i = offset; i < end; i++) { |
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putLong(x[i]); |
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} |
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} |
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return this; |
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} |
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/** |
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* putDouble() method(s)... |
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*/ |
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public final RenderBuffer putDouble(double x) { |
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// assert (position() % SIZEOF_DOUBLE == 0); |
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unsafe.putDouble(curAddress, x); |
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curAddress += SIZEOF_DOUBLE; |
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return this; |
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} |
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} |