1 /* 2 * Copyright (c) 2016, The University of Oxford 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 1. Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * 3. Neither the name of the University of Oxford nor the names of its 13 * contributors may be used to endorse or promote products derived from this 14 * software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef OSKAR_GRID_FUNCTIONS_SPHEROIDAL_H_ 30 #define OSKAR_GRID_FUNCTIONS_SPHEROIDAL_H_ 31 32 /** 33 * @file oskar_grid_functions_spheroidal.h 34 */ 35 36 #include <oskar_global.h> 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /** 43 * @brief 44 * Generates spheroidal grid convolution function (GCF) consistent with CASA. 45 * 46 * @details 47 * Generates spheroidal grid convolution function (GCF) consistent with CASA. 48 * 49 * @param[in] support GCF support size (typ. 3; width = 2 * support + 1). 50 * @param[in] oversample GCF oversample factor, or values per grid cell. 51 * @param[in,out] fn GCF array, length oversample * (support + 1). 52 */ 53 OSKAR_EXPORT 54 void oskar_grid_convolution_function_spheroidal(const int support, 55 const int oversample, double* fn); 56 57 /** 58 * Generates grid correction function for spheroidal convolution function. 59 * 60 * @param[in] image_size Side length of image. 61 * @param[in,out] fn Array holding correction function, length image_size. 62 */ 63 OSKAR_EXPORT 64 void oskar_grid_correction_function_spheroidal(const int image_size, 65 const int padding_gcf, double* fn); 66 67 /** 68 * @brief 69 * Internal function. 70 */ 71 OSKAR_EXPORT 72 double oskar_grid_function_spheroidal(const double nu); 73 74 #ifdef __cplusplus 75 } 76 #endif 77 78 #endif /* OSKAR_GRID_FUNCTIONS_SPHEROIDAL_H_ */ 79