150 lines
3.9 KiB
C++
150 lines
3.9 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_PALETTE_HPP
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#define MAPNIK_PALETTE_HPP
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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/global.hpp>
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#include <mapnik/util/noncopyable.hpp>
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#define USE_DENSE_HASH_MAP
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#include <mapnik/warning.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore.hpp>
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#ifdef USE_DENSE_HASH_MAP
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#include <mapnik/sparsehash/dense_hash_map>
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using rgba_hash_table = google::dense_hash_map<unsigned int, unsigned char>;
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#else
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#include <unordered_map>
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using rgba_hash_table = std::unordered_map<unsigned int, unsigned char>;
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#endif
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MAPNIK_DISABLE_WARNING_POP
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// stl
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#include <vector>
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#include <tuple>
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#define U2RED(x) ((x)&0xff)
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#define U2GREEN(x) (((x)>>8)&0xff)
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#define U2BLUE(x) (((x)>>16)&0xff)
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#define U2ALPHA(x) (((x)>>24)&0xff)
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namespace mapnik {
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struct rgba;
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struct MAPNIK_DECL rgb
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{
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std::uint8_t r;
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std::uint8_t g;
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std::uint8_t b;
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inline rgb(std::uint8_t r_, std::uint8_t g_, std::uint8_t b_) : r(r_), g(g_), b(b_) {}
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rgb(rgba const& c);
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inline bool operator==(const rgb& y) const
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{
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return r == y.r && g == y.g && b == y.b;
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}
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};
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struct MAPNIK_DECL rgba
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{
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std::uint8_t r;
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std::uint8_t g;
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std::uint8_t b;
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std::uint8_t a;
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inline rgba(std::uint8_t r_, std::uint8_t g_, std::uint8_t b_, std::uint8_t a_)
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: r(r_),
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g(g_),
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b(b_),
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a(a_) {}
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inline rgba(rgb const& c)
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: r(c.r),
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g(c.g),
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b(c.b),
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a(0xFF) {}
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inline rgba(unsigned const& c)
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: r(U2RED(c)),
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g(U2GREEN(c)),
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b(U2BLUE(c)),
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a(U2ALPHA(c)) {}
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inline bool operator==(rgba const& y) const
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{
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return r == y.r && g == y.g && b == y.b && a == y.a;
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}
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// ordering by mean(a,r,g,b), a, r, g, b
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struct MAPNIK_DECL mean_sort_cmp
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{
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bool operator() (const rgba& x, const rgba& y) const;
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};
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inline bool operator<(rgba const& y) const
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{
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return std::tie(r, g, b, a) < std::tie(y.r, y.g, y.b, y.a);
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}
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};
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class MAPNIK_DECL rgba_palette : private util::noncopyable
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{
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public:
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enum palette_type { PALETTE_RGBA = 0, PALETTE_RGB = 1, PALETTE_ACT = 2 };
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explicit rgba_palette(std::string const& pal, palette_type type = PALETTE_RGBA);
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rgba_palette();
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inline std::vector<rgb> const& palette() const { return rgb_pal_;}
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inline std::vector<unsigned> const& alpha_table() const { return alpha_pal_;}
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inline std::vector<rgb>& palette() { return rgb_pal_;}
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inline std::vector<unsigned>& alpha_table() { return alpha_pal_;}
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unsigned char quantize(unsigned c) const;
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bool valid() const;
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std::string to_string() const;
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private:
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void parse(std::string const& pal, palette_type type);
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private:
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std::vector<rgba> sorted_pal_;
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mutable rgba_hash_table color_hashmap_;
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unsigned colors_;
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std::vector<rgb> rgb_pal_;
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std::vector<unsigned> alpha_pal_;
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};
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} // namespace mapnik
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#endif // MAPNIK_PALETTE_HPP
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