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diff --git a/gpr/source/lib/gpr_sdk/private/gpr_image_writer.h b/gpr/source/lib/gpr_sdk/private/gpr_image_writer.h
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+++ b/gpr/source/lib/gpr_sdk/private/gpr_image_writer.h
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+/*! @file gpr_image_writer.h
+ *
+ *  @brief Declaration of gpr_image_writer class
+ *
+ *  GPR API can be invoked by simply including this header file.
+ *  This file includes all other header files that are needed.
+ *
+ *  (C) Copyright 2018 GoPro Inc (http://gopro.com/).
+ *
+ *  Licensed under either:
+ *  - Apache License, Version 2.0, http://www.apache.org/licenses/LICENSE-2.0
+ *  - MIT license, http://opensource.org/licenses/MIT
+ *  at your option.
+ *
+ *  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 GPR_IMAGE_WRITER
+#define GPR_IMAGE_WRITER
+
+#include "dng_image_writer.h"
+#include "gpr_buffer_auto.h"
+
+#if GPR_WRITING
+
+#include "vc5_encoder.h"
+
+class gpr_image_writer : public dng_image_writer
+{
+private:
+    
+    gpr_buffer_auto     _vc5_buffer_obj;
+    
+    gpr_rgb_buffer      _rgb_thumbnail;
+
+            gpr_buffer_auto*   _vc5_buffer;
+    const   gpr_buffer_auto*   _raw_buffer;
+    
+    vc5_encoder_parameters vc5_encoder_params;
+    
+public:
+    
+    void EncodeVc5Image();
+    
+    const gpr_rgb_buffer& get_rgb_thumbnail() { return _rgb_thumbnail; }
+    
+    vc5_encoder_parameters& GetVc5EncoderParams() { return vc5_encoder_params; }
+    
+    gpr_image_writer(const gpr_buffer_auto* raw_buffer,
+                         unsigned int raw_buffer_width,
+                         unsigned int raw_buffer_height,
+                         size_t       raw_buffer_pitch,
+                         gpr_buffer_auto* vc5_buffer = NULL );
+    
+    ~gpr_image_writer();
+    
+    void WriteImage (dng_host &host,
+                     const dng_ifd &ifd,
+                     dng_basic_tag_set &basic,
+                     dng_stream &stream,
+                     const dng_image &image,
+                     uint32 fakeChannels);
+    
+    uint32 CompressedBufferSize (const dng_ifd &ifd, uint32 uncompressedSize);
+    
+    uint32 GetDefaultCompression() { return ccVc5; }
+    
+    void WriteTile (dng_host &host,
+                    const dng_ifd &ifd,
+                    dng_stream &stream,
+                    const dng_image &image,
+                    const dng_rect &tileArea,
+                    uint32 fakeChannels,
+                    AutoPtr<dng_memory_block> &compressedBuffer,
+                    AutoPtr<dng_memory_block> &uncompressedBuffer,
+                    AutoPtr<dng_memory_block> &subTileBlockBuffer,
+                    AutoPtr<dng_memory_block> &tempBuffer);
+    
+};
+
+#endif // GPR_WRITING
+
+#endif // GPR_IMAGE_WRITER