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56 lines
2.3 KiB
C++
56 lines
2.3 KiB
C++
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#pragma once
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#include "SDFTransformation.h"
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#include "Shape.h"
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#include "BitmapRef.hpp"
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namespace msdfgen {
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/// Performs error correction on a computed MSDF to eliminate interpolation artifacts. This is a low-level class, you may want to use the API in msdf-error-correction.h instead.
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class MSDFErrorCorrection {
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public:
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/// Stencil flags.
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enum Flags {
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/// Texel marked as potentially causing interpolation errors.
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ERROR = 1,
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/// Texel marked as protected. Protected texels are only given the error flag if they cause inversion artifacts.
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PROTECTED = 2
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};
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MSDFErrorCorrection();
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explicit MSDFErrorCorrection(const BitmapRef<byte, 1> &stencil, const SDFTransformation &transformation);
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/// Sets the minimum ratio between the actual and maximum expected distance delta to be considered an error.
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void setMinDeviationRatio(double minDeviationRatio);
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/// Sets the minimum ratio between the pre-correction distance error and the post-correction distance error.
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void setMinImproveRatio(double minImproveRatio);
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/// Flags all texels that are interpolated at corners as protected.
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void protectCorners(const Shape &shape);
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/// Flags all texels that contribute to edges as protected.
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template <int N>
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void protectEdges(const BitmapConstRef<float, N> &sdf);
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/// Flags all texels as protected.
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void protectAll();
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/// Flags texels that are expected to cause interpolation artifacts based on analysis of the SDF only.
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template <int N>
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void findErrors(const BitmapConstRef<float, N> &sdf);
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/// Flags texels that are expected to cause interpolation artifacts based on analysis of the SDF and comparison with the exact shape distance.
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template <template <typename> class ContourCombiner, int N>
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void findErrors(const BitmapConstRef<float, N> &sdf, const Shape &shape);
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/// Modifies the MSDF so that all texels with the error flag are converted to single-channel.
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template <int N>
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void apply(const BitmapRef<float, N> &sdf) const;
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/// Returns the stencil in its current state (see Flags).
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BitmapConstRef<byte, 1> getStencil() const;
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private:
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BitmapRef<byte, 1> stencil;
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SDFTransformation transformation;
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double minDeviationRatio;
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double minImproveRatio;
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};
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}
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