1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.gallery3d.ui;
18
19import android.annotation.TargetApi;
20import android.graphics.RectF;
21import android.graphics.SurfaceTexture;
22
23import com.android.gallery3d.common.ApiHelper;
24import com.android.gallery3d.glrenderer.ExtTexture;
25import com.android.gallery3d.glrenderer.GLCanvas;
26
27@TargetApi(ApiHelper.VERSION_CODES.HONEYCOMB)
28public abstract class SurfaceTextureScreenNail implements ScreenNail,
29        SurfaceTexture.OnFrameAvailableListener {
30    @SuppressWarnings("unused")
31    private static final String TAG = "SurfaceTextureScreenNail";
32    // This constant is not available in API level before 15, but it was just an
33    // oversight.
34    private static final int GL_TEXTURE_EXTERNAL_OES = 0x8D65;
35
36    protected ExtTexture mExtTexture;
37    private SurfaceTexture mSurfaceTexture;
38    private int mWidth, mHeight;
39    private float[] mTransform = new float[16];
40    private boolean mHasTexture = false;
41
42    public SurfaceTextureScreenNail() {
43    }
44
45    public void acquireSurfaceTexture(GLCanvas canvas) {
46        mExtTexture = new ExtTexture(canvas, GL_TEXTURE_EXTERNAL_OES);
47        mExtTexture.setSize(mWidth, mHeight);
48        mSurfaceTexture = new SurfaceTexture(mExtTexture.getId());
49        setDefaultBufferSize(mSurfaceTexture, mWidth, mHeight);
50        mSurfaceTexture.setOnFrameAvailableListener(this);
51        synchronized (this) {
52            mHasTexture = true;
53        }
54    }
55
56    @TargetApi(ApiHelper.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
57    private static void setDefaultBufferSize(SurfaceTexture st, int width, int height) {
58        if (ApiHelper.HAS_SET_DEFALT_BUFFER_SIZE) {
59            st.setDefaultBufferSize(width, height);
60        }
61    }
62
63    @TargetApi(ApiHelper.VERSION_CODES.ICE_CREAM_SANDWICH)
64    private static void releaseSurfaceTexture(SurfaceTexture st) {
65        st.setOnFrameAvailableListener(null);
66        if (ApiHelper.HAS_RELEASE_SURFACE_TEXTURE) {
67            st.release();
68        }
69    }
70
71    public SurfaceTexture getSurfaceTexture() {
72        return mSurfaceTexture;
73    }
74
75    public void releaseSurfaceTexture() {
76        synchronized (this) {
77            mHasTexture = false;
78        }
79        mExtTexture.recycle();
80        mExtTexture = null;
81        releaseSurfaceTexture(mSurfaceTexture);
82        mSurfaceTexture = null;
83    }
84
85    public void setSize(int width, int height) {
86        mWidth = width;
87        mHeight = height;
88    }
89
90    public void resizeTexture() {
91        if (mExtTexture != null) {
92            mExtTexture.setSize(mWidth, mHeight);
93            setDefaultBufferSize(mSurfaceTexture, mWidth, mHeight);
94        }
95    }
96
97    @Override
98    public int getWidth() {
99        return mWidth;
100    }
101
102    @Override
103    public int getHeight() {
104        return mHeight;
105    }
106
107    @Override
108    public void draw(GLCanvas canvas, int x, int y, int width, int height) {
109        synchronized (this) {
110            if (!mHasTexture) return;
111            mSurfaceTexture.updateTexImage();
112            mSurfaceTexture.getTransformMatrix(mTransform);
113
114            // Flip vertically.
115            canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
116            int cx = x + width / 2;
117            int cy = y + height / 2;
118            canvas.translate(cx, cy);
119            canvas.scale(1, -1, 1);
120            canvas.translate(-cx, -cy);
121            updateTransformMatrix(mTransform);
122            canvas.drawTexture(mExtTexture, mTransform, x, y, width, height);
123            canvas.restore();
124        }
125    }
126
127    @Override
128    public void draw(GLCanvas canvas, RectF source, RectF dest) {
129        throw new UnsupportedOperationException();
130    }
131
132    protected void updateTransformMatrix(float[] matrix) {}
133
134    @Override
135    abstract public void noDraw();
136
137    @Override
138    abstract public void recycle();
139
140    @Override
141    abstract public void onFrameAvailable(SurfaceTexture surfaceTexture);
142}
143