forked from bartvdbraak/blender
fix a glitch where overlapping feathering could give random bad pixels, this was caused by feather edge going in a different direction to the mask edge - creating bowtie quads.
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@ -1991,8 +1991,13 @@ void barycentric_weights_v2(const float v1[2], const float v2[2], const float v3
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void barycentric_weights_v2_quad(const float v1[2], const float v2[2], const float v3[2], const float v4[2],
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const float co[2], float w[4])
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{
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#define MEAN_VALUE_HALF_TAN_V2(_area, i1, i2) ((_area = cross_v2v2(dirs[i1], dirs[i2])) != 0.0f ? \
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(((lens[i1] * lens[i2]) - dot_v2v2(dirs[i1], dirs[i2])) / _area) : 0.0f)
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/* note: fabsf() here is not needed for convex quads (and not used in interp_weights_poly_v2).
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* but in the case of concave/bowtie quads for the mask rasterizer it gives unreliable results
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* without adding absf(). If this becomes an issue for more general useage we could have
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* this optional or use a different function - Campbell */
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#define MEAN_VALUE_HALF_TAN_V2(_area, i1, i2) \
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((_area = cross_v2v2(dirs[i1], dirs[i2])) != 0.0f ? \
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fabsf(((lens[i1] * lens[i2]) - dot_v2v2(dirs[i1], dirs[i2])) / _area) : 0.0f)
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float wtot, area;
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