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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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Campbell Barton 2012-08-04 21:04:26 +00:00
parent ab1badf9a2
commit 7cfe6e0fda
1 changed files with 7 additions and 2 deletions
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source/blender/blenlib/intern/math_geom.c
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@ -1991,8 +1991,13 @@ void barycentric_weights_v2(const float v1[2], const float v2[2], const float v3
void barycentric_weights_v2_quad(const float v1[2], const float v2[2], const float v3[2], const float v4[2], void barycentric_weights_v2_quad(const float v1[2], const float v2[2], const float v3[2], const float v4[2],
const float co[2], float w[4]) const float co[2], float w[4])
{ {
#define MEAN_VALUE_HALF_TAN_V2(_area, i1, i2) ((_area = cross_v2v2(dirs[i1], dirs[i2])) != 0.0f ? \ /* note: fabsf() here is not needed for convex quads (and not used in interp_weights_poly_v2).
(((lens[i1] * lens[i2]) - dot_v2v2(dirs[i1], dirs[i2])) / _area) : 0.0f) * but in the case of concave/bowtie quads for the mask rasterizer it gives unreliable results
* without adding absf(). If this becomes an issue for more general useage we could have
* this optional or use a different function - Campbell */
#define MEAN_VALUE_HALF_TAN_V2(_area, i1, i2) \
((_area = cross_v2v2(dirs[i1], dirs[i2])) != 0.0f ? \
fabsf(((lens[i1] * lens[i2]) - dot_v2v2(dirs[i1], dirs[i2])) / _area) : 0.0f)
float wtot, area; float wtot, area;