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/*
* Copyright (C) 2011 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.Canvas;
/**
* An OpenGL ES 2.0 implementation of {@link HardwareLayer}.
*/
class GLES20Layer extends HardwareLayer {
private int mLayerId;
int mLayerTextureId;
private int mLayerWidth;
private int mLayerHeight;
private final GLES20Canvas mCanvas;
private float mU;
private float mV;
@SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"})
private final Finalizer mFinalizer;
GLES20Layer(int width, int height, boolean isOpaque) {
super(width, height, isOpaque);
int[] layerInfo = new int[3];
mLayerId = GLES20Canvas.nCreateLayer(width, height, layerInfo);
if (mLayerId != 0) {
mLayerWidth = layerInfo[0];
mLayerHeight = layerInfo[1];
mLayerTextureId = layerInfo[2];
mCanvas = new GLES20Canvas(mLayerId, !isOpaque);
mFinalizer = new Finalizer(mLayerId, mLayerTextureId);
mU = mWidth / (float) mLayerWidth;
mV = mHeight/ (float) mLayerHeight;
} else {
mCanvas = null;
mFinalizer = null;
}
}
float getU() {
return mU;
}
float getV() {
return mV;
}
@Override
boolean isValid() {
return mLayerId != 0 && mLayerWidth > 0 && mLayerHeight > 0;
}
@Override
void resize(int width, int height) {
if (!isValid() || width <= 0 || height <= 0) return;
if (width > mLayerWidth || height > mLayerHeight) {
mWidth = width;
mHeight = height;
int[] layerInfo = new int[3];
GLES20Canvas.nResizeLayer(mLayerId, mLayerTextureId, width, height, layerInfo);
mLayerWidth = layerInfo[0];
mLayerHeight = layerInfo[1];
mU = mWidth / (float) mLayerWidth;
mV = mHeight/ (float) mLayerHeight;
}
}
@Override
HardwareCanvas getCanvas() {
return mCanvas;
}
@Override
void end(Canvas currentCanvas) {
if (currentCanvas instanceof GLES20Canvas) {
((GLES20Canvas) currentCanvas).resume();
}
}
@Override
HardwareCanvas start(Canvas currentCanvas) {
if (currentCanvas instanceof GLES20Canvas) {
((GLES20Canvas) currentCanvas).interrupt();
}
return getCanvas();
}
@Override
void destroy() {
mFinalizer.destroy();
mLayerId = mLayerTextureId = 0;
}
private static class Finalizer {
private int mLayerId;
private int mLayerTextureId;
public Finalizer(int layerId, int layerTextureId) {
mLayerId = layerId;
mLayerTextureId = layerTextureId;
}
@Override
protected void finalize() throws Throwable {
try {
if (mLayerId != 0 || mLayerTextureId != 0) {
GLES20Canvas.nDestroyLayer(mLayerId, mLayerTextureId);
}
} finally {
super.finalize();
}
}
void destroy() {
GLES20Canvas.nDestroyLayer(mLayerId, mLayerTextureId);
mLayerId = mLayerTextureId = 0;
}
}
}
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