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/*
* 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;
import android.graphics.Paint;
/**
* 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.
*/
abstract void drawDisplayList(DisplayList displayList);
/**
* Draws the specified layer onto this canvas.
*
* @param left The left coordinate of the layer
* @param top The top coordinate of the layer
* @param right The right coordinate of the layer
* @param bottom The bottom coordinate of the layer
* @param layer The layer to composite on this canvas
* @param paint The paint used to draw the layer
*/
abstract void drawHardwareLayer(float left, float top, float right, float bottom,
HardwareLayer layer, Paint paint);
}
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