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 
17 package com.android.gallery3d.ui;
18 
19 import android.annotation.TargetApi;
20 import android.graphics.RectF;
21 import android.graphics.SurfaceTexture;
22 
23 import com.android.gallery3d.common.ApiHelper;
24 import com.android.gallery3d.glrenderer.ExtTexture;
25 import com.android.gallery3d.glrenderer.GLCanvas;
26 
27 @TargetApi(ApiHelper.VERSION_CODES.HONEYCOMB)
28 public 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 
SurfaceTextureScreenNail()42     public SurfaceTextureScreenNail() {
43     }
44 
acquireSurfaceTexture(GLCanvas canvas)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)
setDefaultBufferSize(SurfaceTexture st, int width, int height)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)
releaseSurfaceTexture(SurfaceTexture st)64     private static void releaseSurfaceTexture(SurfaceTexture st) {
65         st.setOnFrameAvailableListener(null);
66         if (ApiHelper.HAS_RELEASE_SURFACE_TEXTURE) {
67             st.release();
68         }
69     }
70 
getSurfaceTexture()71     public SurfaceTexture getSurfaceTexture() {
72         return mSurfaceTexture;
73     }
74 
releaseSurfaceTexture()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 
setSize(int width, int height)85     public void setSize(int width, int height) {
86         mWidth = width;
87         mHeight = height;
88     }
89 
resizeTexture()90     public void resizeTexture() {
91         if (mExtTexture != null) {
92             mExtTexture.setSize(mWidth, mHeight);
93             setDefaultBufferSize(mSurfaceTexture, mWidth, mHeight);
94         }
95     }
96 
97     @Override
getWidth()98     public int getWidth() {
99         return mWidth;
100     }
101 
102     @Override
getHeight()103     public int getHeight() {
104         return mHeight;
105     }
106 
107     @Override
draw(GLCanvas canvas, int x, int y, int width, int height)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
draw(GLCanvas canvas, RectF source, RectF dest)128     public void draw(GLCanvas canvas, RectF source, RectF dest) {
129         throw new UnsupportedOperationException();
130     }
131 
updateTransformMatrix(float[] matrix)132     protected void updateTransformMatrix(float[] matrix) {}
133 
134     @Override
noDraw()135     abstract public void noDraw();
136 
137     @Override
recycle()138     abstract public void recycle();
139 
140     @Override
onFrameAvailable(SurfaceTexture surfaceTexture)141     abstract public void onFrameAvailable(SurfaceTexture surfaceTexture);
142 }
143