| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| package android.view; |
| |
| import android.annotation.NonNull; |
| import android.util.Pools.SynchronizedPool; |
| |
| /** |
| * An implementation of a GL canvas that records drawing operations. |
| * This is intended for use with a DisplayList. This class keeps a list of all the Paint and |
| * Bitmap objects that it draws, preventing the backing memory of Bitmaps from being freed while |
| * the DisplayList is still holding a native reference to the memory. |
| */ |
| class GLES20RecordingCanvas extends GLES20Canvas { |
| // The recording canvas pool should be large enough to handle a deeply nested |
| // view hierarchy because display lists are generated recursively. |
| private static final int POOL_LIMIT = 25; |
| |
| private static final SynchronizedPool<GLES20RecordingCanvas> sPool = |
| new SynchronizedPool<GLES20RecordingCanvas>(POOL_LIMIT); |
| |
| RenderNode mNode; |
| |
| private GLES20RecordingCanvas() { |
| super(true, true); |
| } |
| |
| static GLES20RecordingCanvas obtain(@NonNull RenderNode node) { |
| if (node == null) throw new IllegalArgumentException("node cannot be null"); |
| |
| GLES20RecordingCanvas canvas = sPool.acquire(); |
| if (canvas == null) { |
| canvas = new GLES20RecordingCanvas(); |
| } |
| canvas.mNode = node; |
| return canvas; |
| } |
| |
| void recycle() { |
| mNode = null; |
| sPool.release(this); |
| } |
| |
| long finishRecording() { |
| return nFinishRecording(mRenderer); |
| } |
| } |