content: /*
   * Copyright (C) 2006 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 android.graphics;
  
  import libcore.util.NativeAllocationRegistry;
  
  /**
   * A color filter can be used with a {@link Paint} to modify the color of
   * each pixel drawn with that paint. This is an abstract class that should
   * never be used directly.
   */
  public class ColorFilter {
  
      private static class NoImagePreloadHolder {
          public static final NativeAllocationRegistry sRegistry =
                  NativeAllocationRegistry.createMalloced(
                  ColorFilter.class.getClassLoader(), nativeGetFinalizer());
      }
  
      /**
       * @deprecated Use subclass constructors directly instead.
       */
      @Deprecated
      public ColorFilter() {}
  
      /**
       * Current native SkColorFilter instance.
       */
      private long mNativeInstance;
      // Runnable to do immediate destruction
      private Runnable mCleaner;
  
      long createNativeInstance() {
          return 0;
      }
  
      void discardNativeInstance() {
          if (mNativeInstance != 0) {
              mCleaner.run();
              mCleaner = null;
              mNativeInstance = 0;
          }
      }
  
      /** @hide */
      public long getNativeInstance() {
          if (mNativeInstance == 0) {
              mNativeInstance = createNativeInstance();
  
              if (mNativeInstance != 0) {
                  // Note: we must check for null here, since it's possible for createNativeInstance()
                  // to return nullptr if the native SkColorFilter would be a no-op at draw time.
                  // See native implementations of subclass create methods for more info.
                  mCleaner = NoImagePreloadHolder.sRegistry.registerNativeAllocation(
                          this, mNativeInstance);
              }
          }
          return mNativeInstance;
  
      }
  
      private static native long nativeGetFinalizer();
  }
  