1 files changed, 151 insertions, 0 deletions
diff --git a/src/com/android/bitmap/ReusableBitmap.java b/src/com/android/bitmap/ReusableBitmap.java
new file mode 100644
index 0000000..dde9bd1
--- /dev/null
+++ b/src/com/android/bitmap/ReusableBitmap.java
@@ -0,0 +1,151 @@
+/*
+ * 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.bitmap;
+
+import android.graphics.Bitmap;
+
+/**
+ * A simple bitmap wrapper. Currently supports reference counting and logical width/height
+ * (which may differ from a bitmap's reported width/height due to bitmap reuse).
+ */
+public class ReusableBitmap implements Poolable {
+
+    public final Bitmap bmp;
+    private int mWidth;
+    private int mHeight;
+    private int mOrientation;
+
+    private int mRefCount = 0;
+    private final boolean mReusable;
+
+    public ReusableBitmap(final Bitmap bitmap) {
+        this(bitmap, true /* reusable */);
+    }
+
+    public ReusableBitmap(final Bitmap bitmap, final boolean reusable) {
+        bmp = bitmap;
+        mReusable = reusable;
+    }
+
+    @Override
+    public boolean isEligibleForPooling() {
+        return mReusable;
+    }
+
+    public void setLogicalWidth(int w) {
+        mWidth = w;
+    }
+
+    public void setLogicalHeight(int h) {
+        mHeight = h;
+    }
+
+    public int getLogicalWidth() {
+        return mWidth;
+    }
+
+    public int getLogicalHeight() {
+        return mHeight;
+    }
+
+    public int getOrientation() {
+        return mOrientation;
+    }
+
+    public void setOrientation(final int orientation) {
+        mOrientation = orientation;
+    }
+
+    public int getByteCount() {
+        return bmp.getByteCount();
+    }
+
+    @Override
+    public void acquireReference() {
+        mRefCount++;
+    }
+
+    @Override
+    public void releaseReference() {
+        if (mRefCount == 0) {
+            throw new IllegalStateException();
+        }
+        mRefCount--;
+    }
+
+    @Override
+    public int getRefCount() {
+        return mRefCount;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder sb = new StringBuilder("[");
+        sb.append(super.toString());
+        sb.append(" refCount=");
+        sb.append(mRefCount);
+        sb.append(" mReusable=");
+        sb.append(mReusable);
+        sb.append(" bmp=");
+        sb.append(bmp);
+        sb.append(" logicalW/H=");
+        sb.append(mWidth);
+        sb.append("/");
+        sb.append(mHeight);
+        if (bmp != null) {
+            sb.append(" sz=");
+            sb.append(bmp.getByteCount() >> 10);
+            sb.append("KB");
+        }
+        sb.append("]");
+        return sb.toString();
+    }
+
+    /**
+     * Singleton class to represent a null Bitmap. We don't want to just use a regular
+     * ReusableBitmap with a null bmp field because that will render that ReusableBitmap useless
+     * and unable to be used by another decode process.
+     */
+    public final static class NullReusableBitmap extends ReusableBitmap {
+        private static NullReusableBitmap sInstance;
+
+        /**
+         * Get a singleton.
+         */
+        public static NullReusableBitmap getInstance() {
+            if (sInstance == null) {
+                sInstance = new NullReusableBitmap();
+            }
+            return sInstance;
+        }
+
+        private NullReusableBitmap() {
+            super(null /* bmp */, false /* reusable */);
+        }
+
+        @Override
+        public int getByteCount() {
+            return 0;
+        }
+
+        @Override
+        public void releaseReference() { }
+
+        @Override
+        public void acquireReference() { }
+    }
+}