1 /*
2  * Copyright (C) 2011 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 HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H
18 #define HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H
19 
20 /*
21  * Contains declaration of a class NV21JpegCompressor that encapsulates a
22  * converter between YV21, and JPEG formats.
23  */
24 
25 #include "jpeg-stub/JpegStub.h"
26 #include <utils/threads.h>
27 
28 namespace android {
29 
30 /* Encapsulates a converter between YV12, and JPEG formats.
31  */
32 class NV21JpegCompressor
33 {
34 public:
35     /* Constructs JpegCompressor instance. */
36     NV21JpegCompressor();
37     /* Destructs JpegCompressor instance. */
38     ~NV21JpegCompressor();
39 
40     /****************************************************************************
41      * Public API
42      ***************************************************************************/
43 
44 public:
45     /* Compresses raw NV21 image into a JPEG.
46      * The compressed image will be saved in mStream member of this class. Use
47      * getCompressedSize method to obtain buffer size of the compressed image,
48      * and getCompressedImage to copy out the compressed image.
49      * Param:
50      *  image - Raw NV21 image.
51      *  width, height - Image dimensions.
52      *  quality - JPEG quality.
53      *  exifData - an EXIF data structure to attach to the image, may be null
54      * Return:
55      *  NO_ERROR on success, or an appropriate error status.
56      *
57      */
58     status_t compressRawImage(const void* image,
59                               int width,
60                               int height,
61                               int quality,
62                               ExifData* exifData);
63 
64     /* Get size of the compressed JPEG buffer.
65      * This method must be called only after a successful completion of
66      * compressRawImage call.
67      * Return:
68      *  Size of the compressed JPEG buffer.
69      */
70     size_t getCompressedSize();
71 
72     /* Copies out compressed JPEG buffer.
73      * This method must be called only after a successful completion of
74      * compressRawImage call.
75      * Param:
76      *  buff - Buffer where to copy the JPEG. Must be large enough to contain the
77      *      entire image.
78      */
79     void getCompressedImage(void* buff);
80 
81     /****************************************************************************
82      * Class data
83      ***************************************************************************/
84 
85 private:
86     // library handle to dlopen
87     static void* mDl;
88     JpegStub mStub;
89 };
90 
91 }; /* namespace android */
92 
93 #endif  /* HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H */
94