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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef GOLDFISH_CAMERA_JPEG_STUB_COMPRESSOR_H
     18 #define GOLDFISH_CAMERA_JPEG_STUB_COMPRESSOR_H
     19 
     20 #include <setjmp.h>
     21 #include <stdlib.h>
     22 extern "C" {
     23 #include <jpeglib.h>
     24 #include <jerror.h>
     25 }
     26 
     27 #include <vector>
     28 
     29 struct _ExifData;
     30 typedef _ExifData ExifData;
     31 
     32 class Compressor {
     33 public:
     34     Compressor();
     35 
     36     /* Compress |data| which represents raw NV21 encoded data of dimensions
     37      * |width| * |height|. |exifData| is optional EXIF data that will be
     38      * attached to the compressed data if present, set to null if not needed.
     39      */
     40     bool compress(const unsigned char* data,
     41                   int width, int height, int quality,
     42                   ExifData* exifData);
     43 
     44     /* Get a reference to the compressed data, this will return an empty vector
     45      * if compress has not been called yet
     46      */
     47     const std::vector<unsigned char>& getCompressedData() const;
     48 
     49 private:
     50     struct DestinationManager : jpeg_destination_mgr {
     51         DestinationManager();
     52 
     53         static void initDestination(j_compress_ptr cinfo);
     54         static boolean emptyOutputBuffer(j_compress_ptr cinfo);
     55         static void termDestination(j_compress_ptr cinfo);
     56 
     57         std::vector<unsigned char> mBuffer;
     58     };
     59     struct ErrorManager : jpeg_error_mgr {
     60         ErrorManager();
     61 
     62         static void onJpegError(j_common_ptr cinfo);
     63 
     64         jmp_buf mJumpBuffer;
     65     };
     66 
     67     jpeg_compress_struct mCompressInfo;
     68     DestinationManager mDestManager;
     69     ErrorManager mErrorManager;
     70 
     71     bool configureCompressor(int width, int height, int quality);
     72     bool compressData(const unsigned char* data, ExifData* exifData);
     73     bool attachExifData(ExifData* exifData);
     74 };
     75 
     76 #endif  // GOLDFISH_CAMERA_JPEG_STUB_COMPRESSOR_H
     77 
     78