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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 java.lang.ref.WeakReference;
/**
* An implementation of display list for OpenGL ES 2.0.
*/
class GLES20DisplayList extends DisplayList {
private GLES20Canvas mCanvas;
private boolean mStarted = false;
private boolean mRecorded = false;
private boolean mValid = false;
int mNativeDisplayList;
WeakReference<View> hostView;
// The native display list will be destroyed when this object dies.
// DO NOT overwrite this reference once it is set.
@SuppressWarnings("unused")
private DisplayListFinalizer mFinalizer;
public GLES20DisplayList(View view) {
hostView = new WeakReference<View>(view);
}
@Override
HardwareCanvas start() {
if (mStarted) {
throw new IllegalStateException("Recording has already started");
}
if (mCanvas != null) {
((GLES20RecordingCanvas) mCanvas).reset();
} else {
mCanvas = new GLES20RecordingCanvas(true);
}
mStarted = true;
mRecorded = false;
mValid = true;
return mCanvas;
}
@Override
void invalidate() {
mStarted = false;
mRecorded = false;
mValid = false;
}
@Override
boolean isValid() {
return mValid;
}
@Override
void end() {
if (mCanvas != null) {
mStarted = false;
mRecorded = true;
mNativeDisplayList = mCanvas.getDisplayList();
mFinalizer = DisplayListFinalizer.getFinalizer(mFinalizer, mNativeDisplayList);
}
}
@Override
boolean isReady() {
return !mStarted && mRecorded;
}
private static class DisplayListFinalizer {
int mNativeDisplayList;
// Factory method returns new instance if old one is null, or old instance
// otherwise, destroying native display list along the way as necessary
static DisplayListFinalizer getFinalizer(DisplayListFinalizer oldFinalizer,
int nativeDisplayList) {
if (oldFinalizer == null) {
return new DisplayListFinalizer(nativeDisplayList);
}
oldFinalizer.replaceNativeObject(nativeDisplayList);
return oldFinalizer;
}
private DisplayListFinalizer(int nativeDisplayList) {
mNativeDisplayList = nativeDisplayList;
}
private void replaceNativeObject(int newNativeDisplayList) {
if (mNativeDisplayList != 0 && mNativeDisplayList != newNativeDisplayList) {
GLES20Canvas.destroyDisplayList(mNativeDisplayList);
}
mNativeDisplayList = newNativeDisplayList;
}
@Override
protected void finalize() throws Throwable {
try {
replaceNativeObject(0);
} finally {
super.finalize();
}
}
}
}
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