Add BytesBufferPool to prevent GC.

Change-Id: Ia8513ff380a60f102481cbf25650eca149b75064

1 files changed, 96 insertions, 0 deletions

diff --git a/src/com/android/gallery3d/data/BitmapPool.java b/src/com/android/gallery3d/data/BitmapPool.java
new file mode 100644
index 000000000..c52a57b0a
--- /dev/null
+++ b/src/com/android/gallery3d/data/BitmapPool.java
@@ -0,0 +1,96 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+
+package com.android.gallery3d.data;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.BitmapFactory.Options;
+
+import com.android.gallery3d.ui.Log;
+import com.android.gallery3d.util.ThreadPool.JobContext;
+
+import java.io.FileDescriptor;
+import java.util.ArrayList;
+
+public class BitmapPool {
+    private static final String TAG = "BitmapPool";
+
+    private static final int POOL_SIZE = 16;
+    private final ArrayList<Bitmap> mPool = new ArrayList<Bitmap>(POOL_SIZE);
+
+    private final int mWidth;
+    private final int mHeight;
+
+    public BitmapPool(int width, int height) {
+        mWidth = width;
+        mHeight = height;
+    }
+
+    public synchronized Bitmap getBitmap() {
+        int size = mPool.size();
+        return size > 0 ? mPool.remove(size - 1) : null;
+    }
+
+    public void recycle(Bitmap bitmap) {
+        if (bitmap == null) return;
+        if ((bitmap.getWidth() != mWidth) || (bitmap.getHeight() != mHeight)) {
+            bitmap.recycle();
+            return;
+        }
+        synchronized (this) {
+            if (mPool.size() < POOL_SIZE) mPool.add(bitmap);
+        }
+    }
+
+    public synchronized void clear() {
+        mPool.clear();
+    }
+
+    public Bitmap decode(JobContext jc,
+            byte[] data, int offset, int length, BitmapFactory.Options options) {
+        if (options == null) options = new BitmapFactory.Options();
+        if (options.inSampleSize < 1) options.inSampleSize = 1;
+        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
+        options.inBitmap = (options.inSampleSize == 1) ? getBitmap() : null;
+        try {
+            Bitmap bitmap = DecodeUtils.decode(jc, data, offset, length, options);
+            if (options.inBitmap != null && options.inBitmap != bitmap) {
+                recycle(options.inBitmap);
+                options.inBitmap = null;
+            }
+            return bitmap;
+        } catch (IllegalArgumentException e) {
+            if (options.inBitmap == null) throw e;
+
+            Log.w(TAG, "decode fail with a given bitmap, try decode to a new bitmap");
+            recycle(options.inBitmap);
+            options.inBitmap = null;
+            return DecodeUtils.decode(jc, data, offset, length, options);
+        }
+    }
+
+    // This is the same as the method above except the source data comes
+    // from a file descriptor instead of a byte array.
+    public Bitmap decode(JobContext jc,
+            FileDescriptor fileDescriptor, Options options) {
+        if (options == null) options = new BitmapFactory.Options();
+        if (options.inSampleSize < 1) options.inSampleSize = 1;
+        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
+        options.inBitmap = (options.inSampleSize == 1) ? getBitmap() : null;
+        try {
+            Bitmap bitmap = DecodeUtils.decode(jc, fileDescriptor, options);
+            if (options.inBitmap != null&& options.inBitmap != bitmap) {
+                recycle(options.inBitmap);
+                options.inBitmap = null;
+            }
+            return bitmap;
+        } catch (IllegalArgumentException e) {
+            if (options.inBitmap == null) throw e;
+
+            Log.w(TAG, "decode fail with a given bitmap, try decode to a new bitmap");
+            recycle(options.inBitmap);
+            options.inBitmap = null;
+            return DecodeUtils.decode(jc, fileDescriptor, options);
+        }
+    }
+}