| /* |
| * 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.graphics.Bitmap; |
| import android.graphics.Canvas; |
| |
| /** |
| * Hardware accelerated canvas. |
| */ |
| abstract class HardwareCanvas extends Canvas { |
| @Override |
| public boolean isHardwareAccelerated() { |
| return true; |
| } |
| |
| @Override |
| public void setBitmap(Bitmap bitmap) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Invoked before any drawing operation is performed in this canvas. |
| */ |
| abstract void onPreDraw(); |
| |
| /** |
| * Invoked after all drawing operation have been performed. |
| */ |
| abstract void onPostDraw(); |
| |
| /** |
| * Draws the specified display list onto this canvas. |
| * |
| * @param displayList The display list to replay. |
| */ |
| public abstract void drawDisplayList(DisplayList displayList); |
| } |