am 74261d84: Merge "Don\'t null the reference to Bitmap pixels until we\'re really ready" into jb-mr1-dev

* commit '74261d847f64ccfeba0a7f08f6c59473a3b6647d':
  Don't null the reference to Bitmap pixels until we're really ready

core/jni/android/graphics/Bitmap.cpp

@@ -261,14 +261,14 @@ static void Bitmap_destructor(JNIEnv* env, jobject, SkBitmap* bitmap) {
     delete bitmap;
 }
 
-static void Bitmap_recycle(JNIEnv* env, jobject, SkBitmap* bitmap) {
+static jboolean Bitmap_recycle(JNIEnv* env, jobject, SkBitmap* bitmap) {
 #ifdef USE_OPENGL_RENDERER
     if (android::uirenderer::Caches::hasInstance()) {
-        android::uirenderer::Caches::getInstance().resourceCache.recycle(bitmap);
+        return android::uirenderer::Caches::getInstance().resourceCache.recycle(bitmap);
-        return;
     }
 #endif // USE_OPENGL_RENDERER
     bitmap->setPixels(NULL, NULL);
+    return true;
 }
 
 // These must match the int values in Bitmap.java
@@ -665,7 +665,7 @@ static JNINativeMethod gBitmapMethods[] = {
     {   "nativeCopy",               "(IIZ)Landroid/graphics/Bitmap;",
         (void*)Bitmap_copy },
     {   "nativeDestructor",         "(I)V", (void*)Bitmap_destructor },
-    {   "nativeRecycle",            "(I)V", (void*)Bitmap_recycle },
+    {   "nativeRecycle",            "(I)Z", (void*)Bitmap_recycle },
     {   "nativeCompress",           "(IIILjava/io/OutputStream;[B)Z",
         (void*)Bitmap_compress },
     {   "nativeErase",              "(II)V", (void*)Bitmap_erase },

graphics/java/android/graphics/Bitmap.java

@@ -201,9 +201,14 @@ public final class Bitmap implements Parcelable {
      */
     public void recycle() {
         if (!mRecycled) {
+            if (nativeRecycle(mNativeBitmap)) {
+                // return value indicates whether native pixel object was actually recycled.
+                // false indicates that it is still in use at the native level and these
+                // objects should not be collected now. They will be collected later when the
+                // Bitmap itself is collected.
                 mBuffer = null;
-            nativeRecycle(mNativeBitmap);
                 mNinePatchChunk = null;
+            }
             mRecycled = true;
         }
     }
@@ -1391,7 +1396,7 @@ public final class Bitmap implements Parcelable {
     private static native Bitmap nativeCopy(int srcBitmap, int nativeConfig,
                                             boolean isMutable);
     private static native void nativeDestructor(int nativeBitmap);
-    private static native void nativeRecycle(int nativeBitmap);
+    private static native boolean nativeRecycle(int nativeBitmap);
 
     private static native boolean nativeCompress(int nativeBitmap, int format,
                                             int quality, OutputStream stream,

libs/hwui/ResourceCache.cpp

@@ -265,27 +265,38 @@ void ResourceCache::destructorLocked(SkiaColorFilter* resource) {
     }
 }
 
-void ResourceCache::recycle(SkBitmap* resource) {
+/**
+ * Return value indicates whether resource was actually recycled, which happens when RefCnt
+ * reaches 0.
+ */
+bool ResourceCache::recycle(SkBitmap* resource) {
     Mutex::Autolock _l(mLock);
-    recycleLocked(resource);
+    return recycleLocked(resource);
 }
 
-void ResourceCache::recycleLocked(SkBitmap* resource) {
+/**
+ * Return value indicates whether resource was actually recycled, which happens when RefCnt
+ * reaches 0.
+ */
+bool ResourceCache::recycleLocked(SkBitmap* resource) {
     ssize_t index = mCache->indexOfKey(resource);
     if (index < 0) {
         // not tracking this resource; just recycle the pixel data
         resource->setPixels(NULL, NULL);
-        return;
+        return true;
     }
     ResourceReference* ref = mCache->valueAt(index);
     if (ref == NULL) {
         // Should not get here - shouldn't get a call to recycle if we're not yet tracking it
-        return;
+        return true;
     }
     ref->recycled = true;
     if (ref->refCount == 0) {
         deleteResourceReferenceLocked(resource, ref);
+        return true;
     }
+    // Still referring to resource, don't recycle yet
+    return false;
 }
 
 /**

libs/hwui/ResourceCache.h

@@ -99,8 +99,8 @@ public:
     void destructorLocked(SkiaShader* resource);
     void destructorLocked(SkiaColorFilter* resource);
 
-    void recycle(SkBitmap* resource);
+    bool recycle(SkBitmap* resource);
-    void recycleLocked(SkBitmap* resource);
+    bool recycleLocked(SkBitmap* resource);
 
 private:
     void deleteResourceReferenceLocked(void* resource, ResourceReference* ref);