FileFormatUtils.cpp

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/*
 * This file is part of ALVAR, A Library for Virtual and Augmented Reality.
 *
 * Copyright 2007-2012 VTT Technical Research Centre of Finland
 *
 * Contact: VTT Augmented Reality Team <alvar.info@vtt.fi>
 *          <http://www.vtt.fi/multimedia/alvar.html>
 *
 * ALVAR is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with ALVAR; if not, see
 * <http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html>.
 */

#include "FileFormatUtils.h"
#include <stdio.h>
#include <sstream>
#include <limits>

namespace alvar {

        bool FileFormatUtils::decodeXMLMatrix(const TiXmlElement *xml_matrix, int &type, int &rows, int &cols) {
                const char * xml_type = xml_matrix->Attribute("type");
                if (strcmp("CV_32F", xml_type) == 0) type = CV_32F;
                else if (strcmp("CV_64F", xml_type) == 0) type = CV_64F;
                else return false;

                if (xml_matrix->QueryIntAttribute("rows", &rows) != TIXML_SUCCESS) return false;
                if (xml_matrix->QueryIntAttribute("cols", &cols) != TIXML_SUCCESS) return false;

                return true;
        }

        CvMat* FileFormatUtils::allocateXMLMatrix(const TiXmlElement *xml_matrix) {
                if (!xml_matrix) return NULL;

                int type, rows, cols;
                if (!decodeXMLMatrix(xml_matrix, type, rows, cols)) return NULL;

                return cvCreateMat(rows, cols, type);
        }

        bool FileFormatUtils::parseXMLMatrix(const TiXmlElement *xml_matrix, CvMat *matrix) {
                if (!xml_matrix || !matrix) return false;

                int type, rows, cols;
                if (!decodeXMLMatrix(xml_matrix, type, rows, cols)) return false;

                if (type != cvGetElemType(matrix)) return false;
                if (rows != matrix->rows) return false;
                if (cols != matrix->cols) return false;

                const TiXmlElement *xml_data = xml_matrix->FirstChildElement("data");
                for (int r = 0; r < matrix->rows; ++r) {
                        for (int c = 0; c < matrix->cols; ++c) {
                                if (!xml_data) return false;
                                double value = atof(xml_data->GetText());
                                cvSetReal2D(matrix, r, c, value);
                                xml_data = (const TiXmlElement *) xml_data->NextSibling("data");
                        }
                }

                return true;
        }

        TiXmlElement* FileFormatUtils::createXMLMatrix(const char* element_name, const CvMat *matrix) {
                if (!matrix) return NULL;

                TiXmlElement* xml_matrix = new TiXmlElement(element_name);
                int precision;
                if (cvGetElemType(matrix) == CV_32F) {
                        xml_matrix->SetAttribute("type", "CV_32F");
                        precision = std::numeric_limits<float>::digits10 + 2;
                }
                else if (cvGetElemType(matrix) == CV_64F) {
                        xml_matrix->SetAttribute("type", "CV_64F");
                        precision = std::numeric_limits<double>::digits10 + 2;
                }
                else {
                        delete xml_matrix;
                        return NULL;
                }

                xml_matrix->SetAttribute("rows", matrix->rows);
                xml_matrix->SetAttribute("cols", matrix->cols);

                for (int r = 0; r < matrix->rows; ++r) {
                        for (int c = 0; c < matrix->cols; ++c) {
                                TiXmlElement *xml_data = new TiXmlElement("data");
                                xml_matrix->LinkEndChild(xml_data);
                                std::stringstream ss;
                                ss.precision(precision);
                                ss<<cvGetReal2D(matrix, r, c);
                                xml_data->LinkEndChild(new TiXmlText(ss.str().c_str()));
                        }
                }
                return xml_matrix;
        }
}