libravatar/sigil algorithm, first try
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example.cpp
28
example.cpp
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@ -34,20 +34,20 @@ int main(int argc, char *argv[])
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img.write("identicon_example_simple.png");
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}
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// {
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// Identiconpp identicon(10, 10, Identiconpp::identicon_type::libravatar,
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// "ffffffff",
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// {
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// "000000ff",
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// "ff0000ff",
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// "ffff00ff",
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// "00ff00ff",
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// "00ffffff",
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// "0000ffff"
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// });
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// img = identicon.generate(digest, 500);
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// img.write("identicon_example_libravatar.png");
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// }
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{
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Identiconpp identicon(5, 5, Identiconpp::identicon_type::libravatar,
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"ffffffff",
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{
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"000000ff",
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"ff0000ff",
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"ffff00ff",
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"00ff00ff",
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"00ffffff",
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"0000ffff"
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});
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img = identicon.generate("5a105e8b9d40e1329780d62ea2265d8a", 500);
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img.write("identicon_example_libravatar.png");
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}
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return 0;
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}
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@ -101,12 +101,12 @@ Magick::Color Identiconpp::get_color(const uint16_t firstbit,
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// Get rid of excess bits
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bits = bits & (1 << colorbits) - 1;
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if (bits > _foreground.size())
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if (bits > (_foreground.size() - 1))
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{
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bits -= _foreground.size();
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bits -= (_foreground.size() - 1);
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}
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// Lookup und set color
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ttdebug << "Color: #" << _foreground[bits - 1] << '\n';
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return Magick::Color("#" + _foreground[bits - 1]);
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ttdebug << "Color: #" << _foreground[bits] << '\n';
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return Magick::Color("#" + _foreground[bits]);
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}
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@ -83,6 +83,9 @@ private:
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/*!
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* @brief Generate simple identicon.
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*
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* Use bits 0 to (columns / 2 + columns % 2) * _rows, use the
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* following bits to determine foreground color.
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*
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* @param digest The pre-computed digest
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* @param width The width of the image
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* @param height The height of the image
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@ -96,6 +99,9 @@ private:
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/*!
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* @brief Generate libravatar-style / sigil identicon.
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*
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* Use bits 9 to (columns / 2 + columns % 2) * _rows, use the first
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* 8 bits to determine foreground color.
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*
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* @param digest The pre-computed digest
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* @param width The width of the image
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* @param height The height of the image
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@ -21,8 +21,27 @@ Magick::Image Identiconpp::generate_libravatar(const string &digest,
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const uint16_t width,
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const uint16_t height)
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{
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throw "Not implemented.";
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// throw "Not implemented.";
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Magick::Image img(Magick::Geometry(_columns, _rows),
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Magick::Color("#" + _background));
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Magick::Color dotcolor = get_color(0, digest);
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uint8_t used_columns = _columns / 2 + _columns % 2;
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uint8_t cells = _rows * used_columns;
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for (uint8_t cur_cell = 0; cur_cell < cells; ++cur_cell)
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{
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if (get_bit(8 + cur_cell, digest))
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{
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const uint8_t column = cur_cell / _columns;
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const uint8_t row = cur_cell % _rows;
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ttdebug << "col=" << std::to_string(column)
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<< ", row=" << std::to_string(row) << '\n';
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img.pixelColor(column, row, dotcolor);
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img.pixelColor(_columns - column - 1, row, dotcolor);
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}
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}
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img.scale(Magick::Geometry(width, height));
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img.magick("png");
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return img;
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}
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@ -34,8 +34,6 @@ Magick::Image Identiconpp::generate_simple(const string &digest,
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{
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ttdebug << "col=" << std::to_string(column)
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<< ", row=" << std::to_string(row) << '\n';
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ttdebug << "col=" << std::to_string(used_columns - 1 + column)
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<< ", row=" << std::to_string(_rows - 1 - row) << '\n';
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img.pixelColor(column, row, dotcolor);
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img.pixelColor(_columns - 1 - column, row, dotcolor);
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}
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