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Merged
craftablescience merged 8 commits into from
Oct 25, 2026
Merged

vtfpp: distancealpha 2.0 #154

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0c9f869
vtfpp: make DISTANCEAA actually estimate coverage
partyvan Oct 20, 2026
06dad95
vtfpp: nuke EUCLIDEAN
partyvan Oct 20, 2026
20f47ee
vtfpp: make dither function as described
partyvan Oct 20, 2026
76717fc
vtfpp: mimic stb in distance mapping edge policies
partyvan Oct 20, 2026
b6ba05c
vtfpp: defunctionalize distance mapping edge policies
partyvan Oct 20, 2026
338bd00
vtfpp: init order
partyvan Oct 20, 2026
572089d
vtfpp: use distance transform algorithm from Felzenszwalb and Huttenl…
partyvan Oct 24, 2026
e237bd4
vtfpp: accurate distance AA under non-half thresholds
partyvan Oct 25, 2026
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5 changes: 3 additions & 2 deletions include/vtfpp/DistanceMapping.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,9 +15,10 @@ enum class Dither {

enum class Flags : uint32_t {
NONE = 0,
DISTANCEAA = 1 << 0, ///< Experimental; interpret the alpha channel as antialiased. Can result in a more precise distance map, but produces nonsense if large gradients are present.
EUCLIDEAN = 1 << 1, ///< The distance-mapping algorithm is a brute-force scan of a *square* area. If this is enabled, only accept distance hits in a circular area.
DISTANCEAA = 1 << 0, ///< Experimental; interpret the alpha channel as antialiased. Can result in a more precise distance map, but can produce nonsense at sharp corners.
EUCLIDEAN = 1 << 1, ///< Meaningless. Preserved for backward compatibility. Never actually did anything.
SAMPLECENTERED = 1 << 2, ///< Search from the center of pixels (in destination coordinate space) rather than in their north-west corners. Can mitigate a perceived southeast shift at extreme reductions.

};
SOURCEPP_BITFLAGS_ENUM(Flags)

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