Improve bitmap load efficiency.

Call prepare before/recycle after using image data.
Change-Id: I3387c8ca68f57c3949fed2aaa3e26490e66c791a

1 files changed, 421 insertions, 0 deletions

diff --git a/src/com/android/camera/data/LocalData.java b/src/com/android/camera/data/LocalData.java
new file mode 100644
index 000000000..1fda9eb67
--- /dev/null
+++ b/src/com/android/camera/data/LocalData.java
@@ -0,0 +1,421 @@
+/*
+ * Copyright (C) 2013 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.data;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Matrix;
+import android.graphics.drawable.Drawable;
+import android.media.MediaMetadataRetriever;
+import android.os.AsyncTask;
+import android.provider.MediaStore.Images.ImageColumns;
+import android.provider.MediaStore.Video;
+import android.provider.MediaStore.Video.VideoColumns;
+import android.util.Log;
+import android.view.View;
+import android.widget.ImageView;
+
+import com.android.camera.ui.FilmStripView;
+
+import java.util.Comparator;
+import java.util.Date;
+
+/* An abstract interface that represents the local media data. Also implements
+ * Comparable interface so we can sort in DataAdapter.
+ */
+abstract interface LocalData extends FilmStripView.ImageData {
+    static final String TAG = "LocalData";
+
+    abstract View getView(Context c, int width, int height, Drawable placeHolder);
+    abstract long getDateTaken();
+    abstract long getDateModified();
+    abstract String getTitle();
+
+    static class NewestFirstComparator implements Comparator<LocalData> {
+
+        private static int compare(long v1, long v2) {
+            if (v1 == -1) {
+                if (v2 == -1) return 0;
+                return -1;
+            }
+            if (v2 == -1) return 0;
+
+            return ((v1 > v2) ? 1 : ((v1 < v2) ? -1 : 0));
+        }
+
+        @Override
+        public int compare(LocalData d1, LocalData d2) {
+            int cmp = compare(d1.getDateTaken(), d2.getDateTaken());
+            if (cmp == 0) {
+                cmp = compare(d1.getDateModified(), d2.getDateModified());
+            }
+            if (cmp == 0) {
+                cmp = d1.getTitle().compareTo(d2.getTitle());
+            }
+            return cmp;
+        }
+    }
+
+    /*
+     * A base class for all the local media files. The bitmap is loaded in background
+     * thread. Subclasses should implement their own background loading thread by
+     * subclassing BitmapLoadTask and overriding doInBackground() to return a bitmap.
+     */
+    abstract static class LocalMediaData implements LocalData {
+        protected long id;
+        protected String title;
+        protected String mimeType;
+        protected long dateTaken;
+        protected long dateModified;
+        protected String path;
+        // width and height should be adjusted according to orientation.
+        protected int width;
+        protected int height;
+
+        // true if this data has a corresponding visible view.
+        protected Boolean mUsing = false;
+
+        @Override
+        public long getDateTaken() {
+            return dateTaken;
+        }
+
+        @Override
+        public long getDateModified() {
+            return dateModified;
+        }
+
+        @Override
+        public String getTitle() {
+            return new String(title);
+        }
+
+        @Override
+        public int getWidth() {
+            return width;
+        }
+
+        @Override
+        public int getHeight() {
+            return height;
+        }
+
+        @Override
+        public boolean isActionSupported(int action) {
+            return false;
+        }
+
+        @Override
+        public View getView(Context c,
+                int decodeWidth, int decodeHeight, Drawable placeHolder) {
+            ImageView v = new ImageView(c);
+            v.setImageDrawable(placeHolder);
+
+            v.setScaleType(ImageView.ScaleType.FIT_XY);
+            BitmapLoadTask task = getBitmapLoadTask(v, decodeWidth, decodeHeight);
+            task.execute();
+            return v;
+        }
+
+        @Override
+        public void prepare() {
+            synchronized (mUsing) {
+                mUsing = true;
+            }
+        }
+
+        @Override
+        public void recycle() {
+            synchronized (mUsing) {
+                mUsing = false;
+            }
+        }
+
+        protected boolean isUsing() {
+            synchronized (mUsing) {
+                return mUsing;
+            }
+        }
+
+        @Override
+        public abstract int getType();
+
+        protected abstract BitmapLoadTask getBitmapLoadTask(
+                ImageView v, int decodeWidth, int decodeHeight);
+
+        /*
+         * An AsyncTask class that loads the bitmap in the background thread.
+         * Sub-classes should implement their own "protected Bitmap doInBackground(Void... )"
+         */
+        protected abstract class BitmapLoadTask extends AsyncTask<Void, Void, Bitmap> {
+            protected ImageView mView;
+
+            protected BitmapLoadTask(ImageView v) {
+                mView = v;
+            }
+
+            @Override
+            protected void onPostExecute(Bitmap bitmap) {
+                if (!isUsing()) return;
+                if (bitmap == null) {
+                    Log.e(TAG, "Failed decoding bitmap for file:" + path);
+                    return;
+                }
+                mView.setScaleType(ImageView.ScaleType.FIT_XY);
+                mView.setImageBitmap(bitmap);
+            }
+        }
+    }
+
+    static class Photo extends LocalMediaData {
+        public static final int COL_ID = 0;
+        public static final int COL_TITLE = 1;
+        public static final int COL_MIME_TYPE = 2;
+        public static final int COL_DATE_TAKEN = 3;
+        public static final int COL_DATE_MODIFIED = 4;
+        public static final int COL_DATA = 5;
+        public static final int COL_ORIENTATION = 6;
+        public static final int COL_WIDTH = 7;
+        public static final int COL_HEIGHT = 8;
+
+        static final String QUERY_ORDER = ImageColumns.DATE_TAKEN + " DESC, "
+                + ImageColumns._ID + " DESC";
+        static final String[] QUERY_PROJECTION = {
+            ImageColumns._ID,           // 0, int
+            ImageColumns.TITLE,         // 1, string
+            ImageColumns.MIME_TYPE,     // 2, string
+            ImageColumns.DATE_TAKEN,    // 3, int
+            ImageColumns.DATE_MODIFIED, // 4, int
+            ImageColumns.DATA,          // 5, string
+            ImageColumns.ORIENTATION,   // 6, int, 0, 90, 180, 270
+            ImageColumns.WIDTH,         // 7, int
+            ImageColumns.HEIGHT,        // 8, int
+        };
+
+        // 32K buffer.
+        private static final byte[] DECODE_TEMP_STORAGE = new byte[32 * 1024];
+
+        // from MediaStore, can only be 0, 90, 180, 270;
+        public int orientation;
+
+        static Photo buildFromCursor(Cursor c) {
+            Photo d = new Photo();
+            d.id = c.getLong(COL_ID);
+            d.title = c.getString(COL_TITLE);
+            d.mimeType = c.getString(COL_MIME_TYPE);
+            d.dateTaken = c.getLong(COL_DATE_TAKEN);
+            d.dateModified = c.getLong(COL_DATE_MODIFIED);
+            d.path = c.getString(COL_DATA);
+            d.orientation = c.getInt(COL_ORIENTATION);
+            d.width = c.getInt(COL_WIDTH);
+            d.height = c.getInt(COL_HEIGHT);
+            if (d.width <= 0 || d.height <= 0) {
+                Log.v(TAG, "warning! zero dimension for "
+                        + d.path + ":" + d.width + "x" + d.height);
+                BitmapFactory.Options opts = decodeDimension(d.path);
+                if (opts != null) {
+                    d.width = opts.outWidth;
+                    d.height = opts.outHeight;
+                } else {
+                    Log.v(TAG, "warning! dimension decode failed for " + d.path);
+                    Bitmap b = BitmapFactory.decodeFile(d.path);
+                    if (b == null) {
+                        return null;
+                    }
+                    d.width = b.getWidth();
+                    d.height = b.getHeight();
+                }
+            }
+            if (d.orientation == 90 || d.orientation == 270) {
+                int b = d.width;
+                d.width = d.height;
+                d.height = b;
+            }
+            return d;
+        }
+
+        @Override
+        public String toString() {
+            return "Photo:" + ",data=" + path + ",mimeType=" + mimeType
+                    + "," + width + "x" + height + ",orientation=" + orientation
+                    + ",date=" + new Date(dateTaken);
+        }
+
+        @Override
+        public int getType() {
+            return TYPE_PHOTO;
+        }
+
+        @Override
+        protected BitmapLoadTask getBitmapLoadTask(
+                ImageView v, int decodeWidth, int decodeHeight) {
+            return new PhotoBitmapLoadTask(v, decodeWidth, decodeHeight);
+        }
+
+        private static BitmapFactory.Options decodeDimension(String path) {
+            BitmapFactory.Options opts = new BitmapFactory.Options();
+            opts.inJustDecodeBounds = true;
+            Bitmap b = BitmapFactory.decodeFile(path, opts);
+            if (b == null)  {
+                return null;
+            }
+            return opts;
+        }
+
+        private final class PhotoBitmapLoadTask extends BitmapLoadTask {
+            private int mDecodeWidth;
+            private int mDecodeHeight;
+
+            public PhotoBitmapLoadTask(ImageView v, int decodeWidth, int decodeHeight) {
+                super(v);
+                mDecodeWidth = decodeWidth;
+                mDecodeHeight = decodeHeight;
+            }
+
+            @Override
+            protected Bitmap doInBackground(Void... v) {
+                BitmapFactory.Options opts = null;
+                Bitmap b;
+                int sample = 1;
+                while (mDecodeWidth * sample < width
+                        || mDecodeHeight * sample < height) {
+                    sample *= 2;
+                }
+                opts = new BitmapFactory.Options();
+                opts.inSampleSize = sample;
+                opts.inTempStorage = DECODE_TEMP_STORAGE;
+                if (isCancelled() || !isUsing()) {
+                    return null;
+                }
+                b = BitmapFactory.decodeFile(path, opts);
+                if (orientation != 0) {
+                    if (isCancelled() || !isUsing()) {
+                        return null;
+                    }
+                    Matrix m = new Matrix();
+                    m.setRotate((float) orientation);
+                    b = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), m, false);
+                }
+                return b;
+            }
+        }
+    }
+
+    static class Video extends LocalMediaData {
+        public static final int COL_ID = 0;
+        public static final int COL_TITLE = 1;
+        public static final int COL_MIME_TYPE = 2;
+        public static final int COL_DATE_TAKEN = 3;
+        public static final int COL_DATE_MODIFIED = 4;
+        public static final int COL_DATA = 5;
+        public static final int COL_WIDTH = 6;
+        public static final int COL_HEIGHT = 7;
+
+        static final String QUERY_ORDER = VideoColumns.DATE_TAKEN + " DESC, "
+                + VideoColumns._ID + " DESC";
+        static final String[] QUERY_PROJECTION = {
+            VideoColumns._ID,           // 0, int
+            VideoColumns.TITLE,         // 1, string
+            VideoColumns.MIME_TYPE,     // 2, string
+            VideoColumns.DATE_TAKEN,    // 3, int
+            VideoColumns.DATE_MODIFIED, // 4, int
+            VideoColumns.DATA,          // 5, string
+            VideoColumns.WIDTH,         // 6, int
+            VideoColumns.HEIGHT,        // 7, int
+            VideoColumns.RESOLUTION
+        };
+
+        static Video buildFromCursor(Cursor c) {
+            Video d = new Video();
+            d.id = c.getLong(COL_ID);
+            d.title = c.getString(COL_TITLE);
+            d.mimeType = c.getString(COL_MIME_TYPE);
+            d.dateTaken = c.getLong(COL_DATE_TAKEN);
+            d.dateModified = c.getLong(COL_DATE_MODIFIED);
+            d.path = c.getString(COL_DATA);
+            d.width = c.getInt(COL_WIDTH);
+            d.height = c.getInt(COL_HEIGHT);
+            MediaMetadataRetriever retriever = new MediaMetadataRetriever();
+            retriever.setDataSource(d.path);
+            String rotation = retriever.extractMetadata(
+                    MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
+            if (d.width == 0 || d.height == 0) {
+                d.width = Integer.parseInt(retriever.extractMetadata(
+                    MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH));
+                d.height = Integer.parseInt(retriever.extractMetadata(
+                    MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT));
+            }
+            retriever.release();
+            if (rotation.equals("90") || rotation.equals("270")) {
+                int b = d.width;
+                d.width = d.height;
+                d.height = b;
+            }
+            return d;
+        }
+
+        @Override
+        public String toString() {
+            return "Video:" + ",data=" + path + ",mimeType=" + mimeType
+                    + "," + width + "x" + height + ",date=" + new Date(dateTaken);
+        }
+
+        @Override
+        public int getType() {
+            return TYPE_PHOTO;
+        }
+
+        @Override
+        protected BitmapLoadTask getBitmapLoadTask(
+                ImageView v, int decodeWidth, int decodeHeight) {
+            return new VideoBitmapLoadTask(v);
+        }
+
+        private final class VideoBitmapLoadTask extends BitmapLoadTask {
+
+            public VideoBitmapLoadTask(ImageView v) {
+                super(v);
+            }
+
+            @Override
+            protected Bitmap doInBackground(Void... v) {
+                if (isCancelled() || !isUsing()) {
+                    return null;
+                }
+                android.media.MediaMetadataRetriever retriever = new MediaMetadataRetriever();
+                retriever.setDataSource(path);
+                byte[] data = retriever.getEmbeddedPicture();
+                Bitmap bitmap = null;
+                if (isCancelled() || !isUsing()) {
+                    retriever.release();
+                    return null;
+                }
+                if (data != null) {
+                    bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
+                }
+                if (bitmap == null) {
+                    bitmap = (Bitmap) retriever.getFrameAtTime();
+                }
+                retriever.release();
+                return bitmap;
+            }
+        }
+    }
+}
+