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Experimental feature, which may make the Clipper offsets run faster

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due to avoiding the 128bit multiply operations:
A filtered predicate is tried to calculate SlopesEqual()
to minimize the invocation of 128bit multiply operations.
This commit is contained in:
bubnikv 2017-07-13 15:52:19 +02:00
parent bd93d2f334
commit 40a882d01e
3 changed files with 110 additions and 161 deletions
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2
xs/src/libslic3r/ClipperUtils.hpp
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@ -15,7 +15,9 @@ using ClipperLib::jtSquare;
// Factor to convert from coord_t (which is int32) to an int64 type used by the Clipper library
// for general offsetting (the offset(), offset2(), offset_ex() functions) and for the safety offset,
// which is optionally executed by other functions (union, intersection, diff).
// This scaling (cca 130t) is applied over the usual SCALING_FACTOR.
// By the way, is the scalling for offset needed at all?
// The reason to apply this scaling may be to match the resolution of the double mantissa.
#define CLIPPER_OFFSET_POWER_OF_2 17
// 2^17=131072
#define CLIPPER_OFFSET_SCALE (1 << CLIPPER_OFFSET_POWER_OF_2)