48 lines
1.4 KiB
C++
48 lines
1.4 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 "readPNG.h"
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#include <igl_stb_image.h>
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IGL_INLINE bool igl::png::readPNG(
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const std::string png_file,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& R,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& G,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& B,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& A
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)
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{
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int cols,rows,n;
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unsigned char *data = stbi_load(png_file.c_str(), &cols, &rows, &n, 4);
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if(data == NULL) {
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return false;
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}
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R.resize(cols,rows);
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G.resize(cols,rows);
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B.resize(cols,rows);
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A.resize(cols,rows);
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for (unsigned i=0; i<rows; ++i) {
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for (unsigned j=0; j<cols; ++j) {
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R(j,rows-1-i) = data[4*(j + cols * i) + 0];
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G(j,rows-1-i) = data[4*(j + cols * i) + 1];
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B(j,rows-1-i) = data[4*(j + cols * i) + 2];
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A(j,rows-1-i) = data[4*(j + cols * i) + 3];
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}
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}
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igl::stbi_image_free(data);
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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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