47 lines
1.8 KiB
C++
47 lines
1.8 KiB
C++
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 Daniele Panozzo <daniele.panozzo@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "writePNG.h"
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#include <igl_stb_image.h>
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#include <vector>
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IGL_INLINE bool igl::png::writePNG(
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const Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& R,
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const Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& G,
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const Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& B,
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const Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& A,
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const std::string png_file
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)
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{
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assert((R.rows() == G.rows()) && (G.rows() == B.rows()) && (B.rows() == A.rows()));
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assert((R.cols() == G.cols()) && (G.cols() == B.cols()) && (B.cols() == A.cols()));
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const int comp = 4; // 4 Channels Red, Green, Blue, Alpha
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const int stride_in_bytes = R.rows()*comp; // Length of one row in bytes
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std::vector<unsigned char> data(R.size()*comp,0); // The image itself;
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for (unsigned i = 0; i<R.rows();++i)
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{
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for (unsigned j = 0; j < R.cols(); ++j)
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{
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data[(j * R.rows() * comp) + (i * comp) + 0] = R(i,R.cols()-1-j);
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data[(j * R.rows() * comp) + (i * comp) + 1] = G(i,R.cols()-1-j);
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data[(j * R.rows() * comp) + (i * comp) + 2] = B(i,R.cols()-1-j);
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data[(j * R.rows() * comp) + (i * comp) + 3] = A(i,R.cols()-1-j);
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}
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}
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igl::stbi_write_png(png_file.c_str(), R.rows(), R.cols(), comp, data.data(), stride_in_bytes);
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return true;
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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// generated by autoexplicit.sh
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#endif
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