/*
 * Copyright (C) 2011 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.
 */

#ifndef HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H
#define HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H

/*
 * Contains declaration of a class NV21JpegCompressor that encapsulates a
 * converter between YV21, and JPEG formats.
 */

#include <utils/threads.h>
#include "JpegStub.h"

namespace android {

/* Encapsulates a converter between YV12, and JPEG formats.
 */
class NV21JpegCompressor {
 public:
  /* Constructs JpegCompressor instance. */
  NV21JpegCompressor();
  /* Destructs JpegCompressor instance. */
  ~NV21JpegCompressor();

  /****************************************************************************
   * Public API
   ***************************************************************************/

 public:
  /* Compresses raw NV21 image into a JPEG.
   * The compressed image will be saved in mStream member of this class. Use
   * getCompressedSize method to obtain buffer size of the compressed image,
   * and getCompressedImage to copy out the compressed image.
   * Param:
   *  image - Raw NV21 image.
   *  metadata - Image metadata (dimensions, location etc).
   *  quality - JPEG quality.
   * Return:
   *  NO_ERROR on success, or an appropriate error status.
   *
   */
  status_t compressRawImage(const void* image, ExifData* exifData,
                            int quality, int width, int height);

  /* Get size of the compressed JPEG buffer.
   * This method must be called only after a successful completion of
   * compressRawImage call.
   * Return:
   *  Size of the compressed JPEG buffer.
   */
  size_t getCompressedSize();

  /* Copies out compressed JPEG buffer.
   * This method must be called only after a successful completion of
   * compressRawImage call.
   * Param:
   *  buff - Buffer where to copy the JPEG. Must be large enough to contain the
   *      entire image.
   */
  void getCompressedImage(void* buff);

  /****************************************************************************
   * Class data
   ***************************************************************************/

 protected:
  /* Strides for Y (the first element), and UV (the second one) panes. */
  int mStrides[2];

 private:
  // library handle to dlopen
  static void* mDl;
  JpegStub mStub;
};

}; /* namespace android */

#endif /* HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H */