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- #pragma once
- /*
- * MULTI-CHANNEL SIGNED DISTANCE FIELD GENERATOR v1.7 (2020-03-07)
- * ---------------------------------------------------------------
- * A utility by Viktor Chlumsky, (c) 2014 - 2020
- *
- * The technique used to generate multi-channel distance fields in this code
- * has been developed by Viktor Chlumsky in 2014 for his master's thesis,
- * "Shape Decomposition for Multi-Channel Distance Fields". It provides improved
- * quality of sharp corners in glyphs and other 2D shapes compared to monochrome
- * distance fields. To reconstruct an image of the shape, apply the median of three
- * operation on the triplet of sampled signed distance values.
- *
- */
- #include "core/arithmetics.hpp"
- #include "core/Vector2.h"
- #include "core/Scanline.h"
- #include "core/Shape.h"
- #include "core/BitmapRef.hpp"
- #include "core/Bitmap.h"
- #include "core/bitmap-interpolation.hpp"
- #include "core/pixel-conversion.hpp"
- #include "core/edge-coloring.h"
- #include "core/interpolation-error-correction.h"
- #include "core/render-sdf.h"
- #include "core/rasterization.h"
- #include "core/estimate-sdf-error.h"
- #include "core/save-bmp.h"
- #include "core/save-tiff.h"
- #include "core/shape-description.h"
- #define MSDFGEN_VERSION "1.7"
- #define MSDFGEN_DEFAULT_ERROR_CORRECTION_THRESHOLD 1.001
- namespace msdfgen {
- /// Generates a conventional single-channel signed distance field.
- void generateSDF(const BitmapRef<float, 1> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate, bool overlapSupport = true);
- /// Generates a single-channel signed pseudo-distance field.
- void generatePseudoSDF(const BitmapRef<float, 1> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate, bool overlapSupport = true);
- /// Generates a multi-channel signed distance field. Edge colors must be assigned first! (See edgeColoringSimple)
- void generateMSDF(const BitmapRef<float, 3> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate, double edgeThreshold = MSDFGEN_DEFAULT_ERROR_CORRECTION_THRESHOLD, bool overlapSupport = true);
- /// Generates a multi-channel signed distance field with true distance in the alpha channel. Edge colors must be assigned first.
- void generateMTSDF(const BitmapRef<float, 4> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate, double edgeThreshold = MSDFGEN_DEFAULT_ERROR_CORRECTION_THRESHOLD, bool overlapSupport = true);
- /// Resolves multi-channel signed distance field values that may cause interpolation artifacts. (Already called by generateMSDF)
- void msdfErrorCorrection(const BitmapRef<float, 3> &output, const Vector2 &threshold);
- void msdfErrorCorrection(const BitmapRef<float, 4> &output, const Vector2 &threshold);
- // Original simpler versions of the previous functions, which work well under normal circumstances, but cannot deal with overlapping contours.
- void generateSDF_legacy(const BitmapRef<float, 1> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate);
- void generatePseudoSDF_legacy(const BitmapRef<float, 1> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate);
- void generateMSDF_legacy(const BitmapRef<float, 3> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate, double edgeThreshold = MSDFGEN_DEFAULT_ERROR_CORRECTION_THRESHOLD);
- void generateMTSDF_legacy(const BitmapRef<float, 4> &output, const Shape &shape, double range, const Vector2 &scale, const Vector2 &translate, double edgeThreshold = MSDFGEN_DEFAULT_ERROR_CORRECTION_THRESHOLD);
- }
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