summaryrefslogtreecommitdiffstats
path: root/src/com/android/camera/ImageLoader.java
blob: e398fbaa7c29c7c11d3ffbcb606c5c8aceee1770 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
/*
 * Copyright (C) 2007 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.camera;

import java.util.ArrayList;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.net.Uri;
import android.util.Config;
import android.util.Log;

class ImageLoader {
    private static final String TAG = "ImageLoader";

    // queue of work to do in the worker thread
    private ArrayList<WorkItem>      mQueue = new ArrayList<WorkItem>();
    private ArrayList<WorkItem>      mInProgress = new ArrayList<WorkItem>();

    // the worker thread and a done flag so we know when to exit
    // currently we only exit from finalize
    private boolean                  mDone;
    private ArrayList<Thread>        mDecodeThreads = new ArrayList<Thread>();
    private android.os.Handler       mHandler;

    private int                      mThreadCount = 1;

    synchronized void clear(Uri uri) {
    }

    synchronized public void dump() {
        synchronized (mQueue) {
            if (Config.LOGV)
                Log.v(TAG, "Loader queue length is " + mQueue.size());
        }
    }

    public interface LoadedCallback {
        public void run(Bitmap result);
    }

    public void pushToFront(final ImageManager.IImage image) {
        synchronized (mQueue) {
            WorkItem w = new WorkItem(image, 0, null, false);

            int existing = mQueue.indexOf(w);
            if (existing >= 1) {
                WorkItem existingWorkItem = mQueue.remove(existing);
                mQueue.add(0, existingWorkItem);
                mQueue.notifyAll();
            }
        }
    }

    public boolean cancel(final ImageManager.IImage image) {
        synchronized (mQueue) {
            WorkItem w = new WorkItem(image, 0, null, false);

            int existing = mQueue.indexOf(w);
            if (existing >= 0) {
                mQueue.remove(existing);
                return true;
            }
            return false;
        }
    }

    public Bitmap getBitmap(final ImageManager.IImage image, final LoadedCallback imageLoadedRunnable, final boolean postAtFront, boolean postBack) {
        return getBitmap(image, 0, imageLoadedRunnable, postAtFront, postBack);
    }

    public Bitmap getBitmap(final ImageManager.IImage image, int tag, final LoadedCallback imageLoadedRunnable, final boolean postAtFront, boolean postBack) {
        synchronized (mDecodeThreads) {
            if (mDecodeThreads.size() == 0) {
                start();
            }
        }
        long t1 = System.currentTimeMillis();
        long t2,t3,t4;
        synchronized (mQueue) {
            t2 = System.currentTimeMillis();
            WorkItem w = new WorkItem(image, tag, imageLoadedRunnable, postBack);

            if (!mInProgress.contains(w)) {
                boolean contains = mQueue.contains(w);
                if (contains) {
                    if (postAtFront) {
                        // move this item to the front
                        mQueue.remove(w);
                        mQueue.add(0, w);
                    }
                } else {
                    if (postAtFront)
                        mQueue.add(0, w);
                    else
                        mQueue.add(w);
                    mQueue.notifyAll();
                }
            }
            if (false)
                dumpQueue("+" + (postAtFront ? "F " : "B ") + tag + ": ");
            t3 = System.currentTimeMillis();
        }
        t4 = System.currentTimeMillis();
//        Log.v(TAG, "getBitmap breakdown: tot= " + (t4-t1) + "; " + "; " + (t4-t3) + "; " + (t3-t2) + "; " + (t2-t1));
        return null;
    }

    private void dumpQueue(String s) {
        synchronized (mQueue) {
            StringBuilder sb = new StringBuilder(s);
            for (int i = 0; i < mQueue.size(); i++) {
                sb.append(mQueue.get(i).mTag + " ");
            }
            if (Config.LOGV)
                Log.v(TAG, sb.toString());
        }
    }

    long bitmapSize(Bitmap b) {
        return b.getWidth() * b.getHeight() * 4;
    }

    class WorkItem {
        ImageManager.IImage mImage;
        int mTargetX, mTargetY;
        int mTag;
        LoadedCallback mOnLoadedRunnable;
        boolean mPostBack;

        WorkItem(ImageManager.IImage image, int tag, LoadedCallback onLoadedRunnable, boolean postBack) {
            mImage = image;
            mTag = tag;
            mOnLoadedRunnable = onLoadedRunnable;
            mPostBack = postBack;
        }

        public boolean equals(Object other) {
            WorkItem otherWorkItem = (WorkItem) other;
            if (otherWorkItem.mImage != mImage)
                return false;

            return true;
        }

        public int hashCode() {
            return mImage.fullSizeImageUri().hashCode();
        }
    }

    public ImageLoader(android.os.Handler handler, int threadCount) {
        mThreadCount = threadCount;
        mHandler = handler;
        start();
    }

    synchronized private void start() {
        if (Config.LOGV)
            Log.v(TAG, "ImageLoader.start() <<<<<<<<<<<<<<<<<<<<<<<<<<<<");

        synchronized (mDecodeThreads) {
            if (mDecodeThreads.size() > 0)
                return;

            mDone = false;
            for (int i = 0;i < mThreadCount; i++) {
                Thread t = new Thread(new Runnable() {
                    // pick off items on the queue, one by one, and compute their bitmap.
                    // place the resulting bitmap in the cache.  then post a notification
                    // back to the ui so things can get updated appropriately.
                    public void run() {
                        while (!mDone) {
                            WorkItem workItem = null;
                            synchronized (mQueue) {
                                if (mQueue.size() > 0) {
                                    workItem = mQueue.remove(0);
                                    mInProgress.add(workItem);
                                }
                                else {
                                    try {
                                        mQueue.wait();
                                    } catch (InterruptedException ex) {
                                    }
                                }
                            }
                            if (workItem != null) {
                                if (false)
                                    dumpQueue("-" + workItem.mTag + ": ");
                                Bitmap b = null;
                                try {
                                    b = workItem.mImage.miniThumbBitmap();
                                } catch (Exception ex) {
                                    if (Config.LOGV) Log.v(TAG, "couldn't load miniThumbBitmap " + ex.toString());
                                    // sd card removal or sd card full
                                }
                                if (b == null) {
                                    if (Config.LOGV) Log.v(TAG, "unable to read thumbnail for " + workItem.mImage.fullSizeImageUri());
                                }

                                synchronized (mQueue) {
                                    mInProgress.remove(workItem);
                                }

                                if (workItem.mOnLoadedRunnable != null) {
                                    if (workItem.mPostBack) {
                                        final WorkItem w1 = workItem;
                                        final Bitmap bitmap = b;
                                        if (!mDone) {
                                            mHandler.post(new Runnable() {
                                                public void run() {
                                                    w1.mOnLoadedRunnable.run(bitmap);
                                                }
                                            });
                                        }
                                    } else {
                                        workItem.mOnLoadedRunnable.run(b);
                                    }
                                }
                            }
                        }
                    }
                });
                t.setName("image-loader-" + i);
                mDecodeThreads.add(t);
                t.start();
            }
        }
    }

    public static Bitmap transform(Matrix scaler, Bitmap source, int targetWidth, int targetHeight,
            boolean scaleUp) {
        int deltaX = source.getWidth() - targetWidth;
        int deltaY = source.getHeight() - targetHeight;
        if (!scaleUp && (deltaX < 0 || deltaY < 0)) {
            /*
             * In this case the bitmap is smaller, at least in one dimension, than the
             * target.  Transform it by placing as much of the image as possible into
             * the target and leaving the top/bottom or left/right (or both) black.
             */
            Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(b2);

            int deltaXHalf = Math.max(0, deltaX/2);
            int deltaYHalf = Math.max(0, deltaY/2);
            Rect src = new Rect(
                    deltaXHalf,
                    deltaYHalf,
                    deltaXHalf + Math.min(targetWidth, source.getWidth()),
                    deltaYHalf + Math.min(targetHeight, source.getHeight()));
            int dstX = (targetWidth  - src.width())  / 2;
            int dstY = (targetHeight - src.height()) / 2;
            Rect dst = new Rect(
                    dstX,
                    dstY,
                    targetWidth - dstX,
                    targetHeight - dstY);
            if (Config.LOGV)
                Log.v(TAG, "draw " + src.toString() + " ==> " + dst.toString());
            c.drawBitmap(source, src, dst, null);
            return b2;
        }
        float bitmapWidthF = source.getWidth();
        float bitmapHeightF = source.getHeight();

        float bitmapAspect = bitmapWidthF / bitmapHeightF;
        float viewAspect   = (float) targetWidth / (float) targetHeight;

        if (bitmapAspect > viewAspect) {
            float scale = targetHeight / bitmapHeightF;
            if (scale < .9F || scale > 1F) {
                scaler.setScale(scale, scale);
            } else {
                scaler = null;
            }
        } else {
            float scale = targetWidth / bitmapWidthF;
            if (scale < .9F || scale > 1F) {
                scaler.setScale(scale, scale);
            } else {
                scaler = null;
            }
        }

        Bitmap b1;
        if (scaler != null) {
            // this is used for minithumb and crop, so we want to filter here.
            b1 = Bitmap.createBitmap(source, 0, 0,
                    source.getWidth(), source.getHeight(), scaler, true);
        } else {
            b1 = source;
        }

        int dx1 = Math.max(0, b1.getWidth() - targetWidth);
        int dy1 = Math.max(0, b1.getHeight() - targetHeight);

        Bitmap b2 = Bitmap.createBitmap(
                b1,
                dx1/2,
                dy1/2,
                targetWidth,
                targetHeight);

        if (b1 != source)
            b1.recycle();

        return b2;
    }

    public void stop() {
        if (Config.LOGV)
            Log.v(TAG, "ImageLoader.stop " + mDecodeThreads.size() + " threads");
        mDone = true;
        synchronized (mQueue) {
            mQueue.notifyAll();
        }
        while (mDecodeThreads.size() > 0) {
            Thread t = mDecodeThreads.get(0);
            try {
                t.join();
                mDecodeThreads.remove(0);
            } catch (InterruptedException ex) {
                // so now what?
            }
        }
    }
}