Pipeline refactoring

Add SharedBuffer and Buffer class

Change-Id: I823a9520541e3be5321a3deb5e58a358588b6cf3

1 files changed, 84 insertions, 0 deletions

diff --git a/src/com/android/gallery3d/filtershow/pipeline/SharedBuffer.java b/src/com/android/gallery3d/filtershow/pipeline/SharedBuffer.java
new file mode 100644
index 000000000..587174668
--- /dev/null
+++ b/src/com/android/gallery3d/filtershow/pipeline/SharedBuffer.java
@@ -0,0 +1,84 @@
+/*
+ * 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.gallery3d.filtershow.pipeline;
+
+import android.graphics.Bitmap;
+import android.util.Log;
+
+public class SharedBuffer {
+
+    private static final String LOGTAG = "SharedBuffer";
+
+    private volatile Buffer mProducer = null;
+    private volatile Buffer mConsumer = null;
+    private volatile Buffer mIntermediate = null;
+    private volatile boolean mNeedsSwap = false;
+
+    private volatile boolean mNeedsRepaint = true;
+
+    public SharedBuffer() {
+    }
+
+    public synchronized void setProducer(Bitmap producer) {
+        mProducer = new Buffer(producer);
+    }
+
+    public synchronized Buffer getProducer() {
+        return mProducer;
+    }
+
+    public synchronized Buffer getConsumer() {
+        return mConsumer;
+    }
+
+    public synchronized void swapProducer() {
+        if (mProducer != null) {
+            mProducer.sync();
+        }
+        Buffer intermediate = mIntermediate;
+        mIntermediate = mProducer;
+        mProducer = intermediate;
+        mNeedsSwap = true;
+    }
+
+    public synchronized void swapConsumer() {
+        if (!mNeedsSwap) {
+            return;
+        }
+        if (mConsumer != null) {
+            mConsumer.sync();
+        }
+        Buffer intermediate = mIntermediate;
+        mIntermediate = mConsumer;
+        mConsumer = intermediate;
+        mNeedsSwap = false;
+    }
+
+    public synchronized void invalidate() {
+        mNeedsRepaint = true;
+    }
+
+    public synchronized boolean checkRepaintNeeded() {
+        if (mNeedsRepaint) {
+            mNeedsRepaint = false;
+            return true;
+        }
+        return false;
+    }
+
+}
+