Fix flickering while editing

Change-Id: Ic06e0c59059d97f8dd7c150d22746c1f90d7bed1

3 files changed, 30 insertions, 16 deletions

diff --git a/src/com/android/gallery3d/filtershow/pipeline/Buffer.java b/src/com/android/gallery3d/filtershow/pipeline/Buffer.java
index 3b596886f..c378eb994 100644
--- a/src/com/android/gallery3d/filtershow/pipeline/Buffer.java
+++ b/src/com/android/gallery3d/filtershow/pipeline/Buffer.java
@@ -17,6 +17,7 @@
 package com.android.gallery3d.filtershow.pipeline;
 
 import android.graphics.Bitmap;
+import android.graphics.Canvas;
 import android.support.v8.renderscript.Allocation;
 import android.support.v8.renderscript.RenderScript;
 import android.util.Log;
@@ -33,7 +34,8 @@ public class Buffer {
     public Buffer(Bitmap bitmap) {
         RenderScript rs = CachingPipeline.getRenderScriptContext();
         if (bitmap != null) {
-            mBitmap = bitmap;
+            BitmapCache cache = MasterImage.getImage().getBitmapCache();
+            mBitmap = cache.getBitmapCopy(bitmap, BitmapCache.PREVIEW_CACHE);
         }
         if (mUseAllocation) {
             // TODO: recreate the allocation when the RS context changes
@@ -43,7 +45,23 @@ public class Buffer {
         }
     }
 
-    public Bitmap getBitmap() {
+    public boolean isSameSize(Bitmap bitmap) {
+        if (mBitmap == null || bitmap == null) {
+            return false;
+        }
+        if (mBitmap.getWidth() == bitmap.getWidth()
+                && mBitmap.getHeight() == bitmap.getHeight()) {
+            return true;
+        }
+        return false;
+    }
+
+    public synchronized void useBitmap(Bitmap bitmap) {
+        Canvas canvas = new Canvas(mBitmap);
+        canvas.drawBitmap(bitmap, 0, 0, null);
+    }
+
+    public synchronized Bitmap getBitmap() {
         return mBitmap;
     }
 
diff --git a/src/com/android/gallery3d/filtershow/pipeline/CachingPipeline.java b/src/com/android/gallery3d/filtershow/pipeline/CachingPipeline.java
index 07ab14ac9..f3c32dc01 100644
--- a/src/com/android/gallery3d/filtershow/pipeline/CachingPipeline.java
+++ b/src/com/android/gallery3d/filtershow/pipeline/CachingPipeline.java
@@ -419,9 +419,9 @@ public class CachingPipeline implements PipelineInterface {
         }
         setupEnvironment(preset, false);
         Vector<FilterRepresentation> filters = preset.getFilters();
-        buffer.removeProducer();
         Bitmap result = mCachedProcessing.process(mOriginalBitmap, filters, mEnvironment);
         buffer.setProducer(result);
+        mEnvironment.cache(result);
     }
 
     public synchronized void computeOld(SharedBuffer buffer, ImagePreset preset, int type) {
diff --git a/src/com/android/gallery3d/filtershow/pipeline/SharedBuffer.java b/src/com/android/gallery3d/filtershow/pipeline/SharedBuffer.java
index 267315ccd..f243aa66e 100644
--- a/src/com/android/gallery3d/filtershow/pipeline/SharedBuffer.java
+++ b/src/com/android/gallery3d/filtershow/pipeline/SharedBuffer.java
@@ -29,20 +29,16 @@ public class SharedBuffer {
     private volatile boolean mNeedsSwap = false;
     private volatile boolean mNeedsRepaint = true;
 
-    public void setProducer(Bitmap producer) {
-        removeProducer();
-        Buffer buffer = new Buffer(producer);
-        synchronized (this) {
-            mProducer = buffer;
+    public synchronized void setProducer(Bitmap producer) {
+        if (mProducer != null
+                && !mProducer.isSameSize(producer)) {
+            mProducer.remove();
+            mProducer = null;
         }
-    }
-
-    public void removeProducer() {
-        synchronized (this) {
-            if (mProducer != null) {
-                mProducer.remove();
-                mProducer = null;
-            }
+        if (mProducer == null) {
+            mProducer = new Buffer(producer);
+        } else {
+            mProducer.useBitmap(producer);
         }
     }