Revision: 49564
http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=49564
Author: campbellbarton
Date: 2012-08-04 21:04:26 +0000 (Sat, 04 Aug 2012)
Log Message:
-----------
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.
Modified Paths:
--------------
trunk/blender/source/blender/blenlib/intern/math_geom.c
Modified: trunk/blender/source/blender/blenlib/intern/math_geom.c
===================================================================
--- trunk/blender/source/blender/blenlib/intern/math_geom.c 2012-08-04
20:25:04 UTC (rev 49563)
+++ trunk/blender/source/blender/blenlib/intern/math_geom.c 2012-08-04
21:04:26 UTC (rev 49564)
@@ -1991,8 +1991,13 @@
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])
{
-#define MEAN_VALUE_HALF_TAN_V2(_area, i1, i2) ((_area = cross_v2v2(dirs[i1],
dirs[i2])) != 0.0f ? \
- (((lens[i1] * lens[i2]) -
dot_v2v2(dirs[i1], dirs[i2])) / _area) : 0.0f)
+ /* note: fabsf() here is not needed for convex quads (and not used in
interp_weights_poly_v2).
+ * 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;
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