152   jpeg_compress_struct& cinfo =  in Compress()  local
168   cinfo.err = jpeg_std_error(&err.pub);  in Compress()
172   err.pub.error_exit = [](j_common_ptr cinfo) {  in Compress()  argument
173     my_error_mgr* myerr = reinterpret_cast<my_error_mgr*>(cinfo->err);  in Compress()
175     (*cinfo->err->output_message)(cinfo);  in Compress()
181   cinfo.err = (struct jpeg_error_mgr*)&err;  in Compress()
187     jpeg_destroy_compress(&cinfo);  in Compress()
197   jpeg_create_compress(&cinfo);  in Compress()
207   cinfo.client_data = &clientData;  in Compress()
212   dest.init_destination = [](j_compress_ptr cinfo) {  in Compress()  argument
213     ClientData& cdata = *reinterpret_cast<ClientData*>(cinfo->client_data);  in Compress()
215     cinfo->dest->next_output_byte = cdata.out_buf;  in Compress()
216     cinfo->dest->free_in_buffer = cdata.out_buf_capacity;  in Compress()
219   dest.empty_output_buffer = [](j_compress_ptr cinfo) -> boolean {  in Compress()  argument
220     ClientData& cdata = *reinterpret_cast<ClientData*>(cinfo->client_data);  in Compress()
227     cinfo->dest->next_output_byte = cdata.out_buf;  in Compress()
228     cinfo->dest->free_in_buffer = cdata.out_buf_capacity;  in Compress()
233   dest.term_destination = [](j_compress_ptr cinfo __unused) {  in Compress()
237   cinfo.dest = &dest;  in Compress()
240   cinfo.image_width = img_width;  in Compress()
241   cinfo.image_height = img_height;  in Compress()
242   cinfo.input_components = 3;  in Compress()
245   jpeg_set_defaults(&cinfo);  in Compress()
247   jpeg_set_quality(&cinfo, quality, true);  in Compress()
249   cinfo.dct_method = JDCT_IFAST;  in Compress()
251   cinfo.raw_data_in = true;  in Compress()
253   jpeg_set_colorspace(&cinfo, JCS_YCbCr);  in Compress()
255   cinfo.comp_info[0].h_samp_factor = 2;  in Compress()
256   cinfo.comp_info[0].v_samp_factor = 2;  in Compress()
257   cinfo.comp_info[1].h_samp_factor = 1;  in Compress()
258   cinfo.comp_info[1].v_samp_factor = 1;  in Compress()
259   cinfo.comp_info[2].h_samp_factor = 1;  in Compress()
260   cinfo.comp_info[2].v_samp_factor = 1;  in Compress()
262   jpeg_start_compress(&cinfo, true);  in Compress()
264   yArr = new JSAMPROW[cinfo.comp_info[0].v_samp_factor * DCTSIZE];  in Compress()
265   cbArr = new JSAMPROW[cinfo.comp_info[1].v_samp_factor * DCTSIZE];  in Compress()
266   crArr = new JSAMPROW[cinfo.comp_info[2].v_samp_factor * DCTSIZE];  in Compress()
285     jpeg_write_raw_data(&cinfo, imgArr, DCTSIZE * 2);  in Compress()
288   jpeg_finish_compress(&cinfo);  in Compress()
290   int numBytesInBuffer = cinfo.dest->next_output_byte - out_buf;  in Compress()
300   jpeg_destroy_compress(&cinfo);  in Compress()