44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
#include <psemek/pcg/blur.hpp>
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#include <psemek/gfx/color.hpp>
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#include <cmath>
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#include <vector>
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namespace psemek::pcg
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{
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namespace detail
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{
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std::vector<float> gauss_coeffs(int size, float sigma)
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{
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std::vector<float> res(2 * size + 1);
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float sum = 0.f;
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for (int i = -size; i <= size; ++i)
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{
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float x = (i / sigma);
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res[i + size] = std::exp(- x * x);
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sum += res[i + size];
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}
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for (auto & c : res)
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c /= sum;
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return res;
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}
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}
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gfx::pixmap_rgb blur(gfx::pixmap_rgb const & p, int size, float sigma, seamless_tag)
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{
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auto converted = util::map([](gfx::color_rgb const & c){ return gfx::to_colorf(c); }, p);
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converted = blur(converted, size, sigma, seamless);
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return util::map([](geom::vector<float, 3> const & c){ return gfx::to_coloru8(c); }, converted);
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}
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gfx::pixmap_rgba blur(gfx::pixmap_rgba const & p, int size, float sigma, seamless_tag)
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{
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auto converted = util::map([](gfx::color_rgba const & c){ return gfx::to_colorf(c); }, p);
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converted = blur(converted, size, sigma, seamless);
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return util::map([](geom::vector<float, 4> const & c){ return gfx::to_coloru8(c); }, converted);
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}
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}
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