+ (void)bitsallocated;
+ struct jpeg_compress_struct cinfo;
+ int row_stride; /* physical row width in image buffer */
+
+ /* This struct contains the JPEG compression parameters and pointers to
+ * working space (which is allocated as needed by the JPEG library).
+ * It is possible to have several such structures, representing multiple
+ * compression/decompression processes, in existence at once. We refer
+ * to any one struct (and its associated working data) as a "JPEG object".
+ */
+ //struct jpeg_compress_struct cinfo;
+ /* This struct represents a JPEG error handler. It is declared separately
+ * because applications often want to supply a specialized error handler
+ * (see the second half of this file for an example). But here we just
+ * take the easy way out and use the standard error handler, which will
+ * print a message on stderr and call exit() if compression fails.
+ * Note that this struct must live as long as the main JPEG parameter
+ * struct, to avoid dangling-pointer problems.
+ */
+ struct jpeg_error_mgr jerr;
+ /* More stuff */
+
+ /* Step 1: allocate and initialize JPEG compression object */
+
+ /* We have to set up the error handler first, in case the initialization
+ * step fails. (Unlikely, but it could happen if you are out of memory.)
+ * This routine fills in the contents of struct jerr, and returns jerr's
+ * address which we place into the link field in cinfo.
+ */
+ cinfo.err = jpeg_std_error(&jerr);
+ /* Now we can initialize the JPEG compression object. */
+ jpeg_create_compress(&cinfo);
+
+ /* Step 2: specify data destination (eg, a file) */
+ /* Note: steps 2 and 3 can be done in either order. */
+
+ int fragment_size = static_cast< int >( inputlength );
+ jpeg_stdio_dest(&cinfo, fp, fragment_size, 1);
+
+ /* Step 3: set parameters for compression */
+
+ /* First we supply a description of the input image.
+ * Four fields of the cinfo struct must be filled in:
+ */
+ cinfo.image_width = image_width;/* image width and height, in pixels */
+ cinfo.image_height = image_height;
+ if ( sample_pixel == 3 )
+ {
+ cinfo.input_components = 3; /* # of color components per pixel */
+ cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
+ }
+ else
+ {
+ cinfo.input_components = 1; /* # of color components per pixel */
+ cinfo.in_color_space = JCS_GRAYSCALE; /* colorspace of input image */
+ }
+ /* Now use the library's routine to set default compression parameters.
+ * (You must set at least cinfo.in_color_space before calling this,
+ * since the defaults depend on the source color space.)
+ */
+ jpeg_set_defaults(&cinfo);
+ /*
+ * http://www.koders.com/c/fid80DBBF1D49D004EF71CE7C493C34610C4F17D3D3.aspx
+ * http://studio.imagemagick.org/pipermail/magick-users/2002-September/004685.html
+ * You need to set -quality 101 or greater. If quality is 100 or less you
+ * get regular JPEG output. This is not explained in the documentation, only
+ * in the comments in coder/jpeg.c. When you have configured libjpeg with
+ * lossless support, then
+ *
+ * quality=predictor*100 + point_transform
+ *
+ * If you don't know what these values should be, just use 101.
+ * They only affect the compression ratio, not the image appearance,
+ * which is lossless.
+ */
+ jpeg_simple_lossless (&cinfo, 1, 0);
+ /* Now you can set any non-default parameters you wish to.
+ * Here we just illustrate the use of quality (quantization table) scaling:
+ */
+ jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
+
+ /* Step 4: Start compressor */
+
+ /* TRUE ensures that we will write a complete interchange-JPEG file.
+ * Pass TRUE unless you are very sure of what you're doing.
+ */
+ jpeg_start_compress(&cinfo, TRUE);
+
+ /* Step 5: while (scan lines remain to be written) */
+ /* jpeg_write_scanlines(...); */
+
+ /* Here we use the library's state variable cinfo.next_scanline as the
+ * loop counter, so that we don't have to keep track ourselves.
+ * To keep things simple, we pass one scanline per call; you can pass
+ * more if you wish, though.
+ */
+ if (sample_pixel == 3)
+ {
+ row_stride = image_width * 3;/* JSAMPLEs per row in image_buffer */
+ }
+ else
+ {
+ assert( sample_pixel == 1 );
+ row_stride = image_width * 1;/* JSAMPLEs per row in image_buffer */
+ }
+
+ (void)numZ;
+
+ uint8_t* input_buffer = (uint8_t*)inputdata;
+ //uint8_t *pbuffer = input_buffer;
+ //int i;
+ //for(i=0; i<numZ; ++i)
+// {
+ JSAMPLE *image_buffer = (JSAMPLE*) input_buffer;
+ JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
+ row_pointer[0] = image_buffer;
+
+ while (cinfo.next_scanline < cinfo.image_height) {
+ /* jpeg_write_scanlines expects an array of pointers to scanlines.
+ * Here the array is only one element long, but you could pass
+ * more than one scanline at a time if that's more convenient.
+ */
+ //row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
+
+ if( jpeg_write_scanlines(&cinfo, row_pointer, 1) != 1)
+ {
+ //entering suspension mode, basically we wrote the whole jpeg fragment
+ // technically we could enforce that by checkig the value of row_pointer to
+ // actually be at the end of the image...TODO
+ return false;
+ }
+ row_pointer[0] += row_stride;
+ }
+// pbuffer+=fragment_size; //shift to next image
+
+ //Upodate frag size
+// size_t end = fp->tellp();
+// std::cerr << "DIFF: " << end-beg << std::endl;
+
+// JpegPair &jp = v[i];
+// jp.second = end-beg;
+ //beg = end; //
+ // }
+
+ /* Step 6: Finish compression */
+
+ jpeg_finish_compress(&cinfo);
+
+ /* Step 7: release JPEG compression object */
+
+ /* This is an important step since it will release a good deal of memory. */
+ jpeg_destroy_compress(&cinfo);
+
+ /* And we're done! */
+
+ return true;