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28 lines
952 B
28 lines
952 B
#include "read_png_to_imagematrix.hpp"
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#include <png++/png.hpp>
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#include <cstring> // for strerror needed by png++/error.hpp
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ImageMatrix readPngToImageMatrix(const std::string& filename)
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{
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png::image<png::gray_pixel> image(filename); // throws std_error(filename);
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const std::size_t width = image.get_width();
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const std::size_t height = image.get_height();
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std::vector<ImageMatrix::CellType> cells(width * height);
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for (std::size_t y = 0; y < height; ++y) {
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const png::image<png::gray_pixel>::row_type& row = image[y];
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for (std::size_t x = 0; x < width; ++x) {
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ImageMatrix::CellType c; // map pixel luminance to cell type
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if (row[x] < 16) c = ImageMatrix::SOLID; // black
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else if (row[x] >= 240) c = ImageMatrix::FREE; // white
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else c = ImageMatrix::DESTROYABLE; // everything else
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cells.push_back(c);
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}
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}
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return ImageMatrix(width, height, cells);
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}
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