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/*
* Copyright (C) 2012 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 com.android.gallery3d.ui;
import android.annotation.TargetApi;
import android.graphics.RectF;
import android.graphics.SurfaceTexture;
import android.opengl.GLES11Ext;
import com.android.gallery3d.common.ApiHelper;
public abstract class SurfaceTextureScreenNail implements ScreenNail,
SurfaceTexture.OnFrameAvailableListener {
private static final String TAG = "SurfaceTextureScreenNail";
// This constant is not available in API level before 15, but it was just an
// oversight.
private static final int GL_TEXTURE_EXTERNAL_OES = 0x8D65;
protected ExtTexture mExtTexture;
private SurfaceTexture mSurfaceTexture;
private int mWidth, mHeight;
private float[] mTransform = new float[16];
private boolean mHasTexture = false;
public SurfaceTextureScreenNail() {
}
public void acquireSurfaceTexture() {
mExtTexture = new ExtTexture(GL_TEXTURE_EXTERNAL_OES);
mExtTexture.setSize(mWidth, mHeight);
mSurfaceTexture = new SurfaceTexture(mExtTexture.getId());
setDefaultBufferSize(mSurfaceTexture, mWidth, mHeight);
mSurfaceTexture.setOnFrameAvailableListener(this);
synchronized (this) {
mHasTexture = true;
}
}
@TargetApi(ApiHelper.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
private static void setDefaultBufferSize(SurfaceTexture st, int width, int height) {
if (ApiHelper.HAS_SET_DEFALT_BUFFER_SIZE) {
st.setDefaultBufferSize(width, height);
}
}
@TargetApi(ApiHelper.VERSION_CODES.ICE_CREAM_SANDWICH)
private static void releaseSurfaceTexture(SurfaceTexture st) {
if (ApiHelper.HAS_RELEASE_SURFACE_TEXTURE) {
st.release();
}
}
public SurfaceTexture getSurfaceTexture() {
return mSurfaceTexture;
}
public void releaseSurfaceTexture() {
synchronized (this) {
mHasTexture = false;
}
mExtTexture.recycle();
mExtTexture = null;
releaseSurfaceTexture(mSurfaceTexture);
mSurfaceTexture = null;
}
public void setSize(int width, int height) {
mWidth = width;
mHeight = height;
}
@Override
public int getWidth() {
return mWidth;
}
@Override
public int getHeight() {
return mHeight;
}
@Override
public void draw(GLCanvas canvas, int x, int y, int width, int height) {
synchronized (this) {
if (!mHasTexture) return;
mSurfaceTexture.updateTexImage();
mSurfaceTexture.getTransformMatrix(mTransform);
// Flip vertically.
canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
int cx = x + width / 2;
int cy = y + height / 2;
canvas.translate(cx, cy);
canvas.scale(1, -1, 1);
canvas.translate(-cx, -cy);
canvas.drawTexture(mExtTexture, mTransform, x, y, width, height);
canvas.restore();
}
}
@Override
public void draw(GLCanvas canvas, RectF source, RectF dest) {
throw new UnsupportedOperationException();
}
@Override
abstract public void noDraw();
@Override
abstract public void recycle();
@Override
abstract public void onFrameAvailable(SurfaceTexture surfaceTexture);
}
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