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.glrenderer;
18 
19 import com.android.gallery3d.ui.GLRoot;
20 import com.android.gallery3d.ui.GLRoot.OnGLIdleListener;
21 
22 import java.util.ArrayDeque;
23 
24 public class TextureUploader implements OnGLIdleListener {
25     private static final int INIT_CAPACITY = 64;
26     private static final int QUOTA_PER_FRAME = 1;
27 
28     private final ArrayDeque<UploadedTexture> mFgTextures =
29             new ArrayDeque<UploadedTexture>(INIT_CAPACITY);
30     private final ArrayDeque<UploadedTexture> mBgTextures =
31             new ArrayDeque<UploadedTexture>(INIT_CAPACITY);
32     private final GLRoot mGLRoot;
33     private volatile boolean mIsQueued = false;
34 
TextureUploader(GLRoot root)35     public TextureUploader(GLRoot root) {
36         mGLRoot = root;
37     }
38 
clear()39     public synchronized void clear() {
40         while (!mFgTextures.isEmpty()) {
41             mFgTextures.pop().setIsUploading(false);
42         }
43         while (!mBgTextures.isEmpty()) {
44             mBgTextures.pop().setIsUploading(false);
45         }
46     }
47 
48     // caller should hold synchronized on "this"
queueSelfIfNeed()49     private void queueSelfIfNeed() {
50         if (mIsQueued) return;
51         mIsQueued = true;
52         mGLRoot.addOnGLIdleListener(this);
53     }
54 
addBgTexture(UploadedTexture t)55     public synchronized void addBgTexture(UploadedTexture t) {
56         if (t.isContentValid()) return;
57         mBgTextures.addLast(t);
58         t.setIsUploading(true);
59         queueSelfIfNeed();
60     }
61 
addFgTexture(UploadedTexture t)62     public synchronized void addFgTexture(UploadedTexture t) {
63         if (t.isContentValid()) return;
64         mFgTextures.addLast(t);
65         t.setIsUploading(true);
66         queueSelfIfNeed();
67     }
68 
upload(GLCanvas canvas, ArrayDeque<UploadedTexture> deque, int uploadQuota, boolean isBackground)69     private int upload(GLCanvas canvas, ArrayDeque<UploadedTexture> deque,
70             int uploadQuota, boolean isBackground) {
71         while (uploadQuota > 0) {
72             UploadedTexture t;
73             synchronized (this) {
74                 if (deque.isEmpty()) break;
75                 t = deque.removeFirst();
76                 t.setIsUploading(false);
77                 if (t.isContentValid()) continue;
78 
79                 // this has to be protected by the synchronized block
80                 // to prevent the inner bitmap get recycled
81                 t.updateContent(canvas);
82             }
83 
84             // It will took some more time for a texture to be drawn for
85             // the first time.
86             // Thus, when scrolling, if a new column appears on screen,
87             // it may cause a UI jank even these textures are uploaded.
88             if (isBackground) t.draw(canvas, 0, 0);
89             --uploadQuota;
90         }
91         return uploadQuota;
92     }
93 
94     @Override
onGLIdle(GLCanvas canvas, boolean renderRequested)95     public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) {
96         int uploadQuota = QUOTA_PER_FRAME;
97         uploadQuota = upload(canvas, mFgTextures, uploadQuota, false);
98         if (uploadQuota < QUOTA_PER_FRAME) mGLRoot.requestRender();
99         upload(canvas, mBgTextures, uploadQuota, true);
100         synchronized (this) {
101             mIsQueued = !mFgTextures.isEmpty() || !mBgTextures.isEmpty();
102             return mIsQueued;
103         }
104     }
105 }
106