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Fix [#36538] Discontinuity (Euler) Filter - never ends - (deadlock?)

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Code could enter in an infinite loop when curve value was an odd multiple of PI (i.e. 180°)...

Current code was also factorized and got rid of fabs calls! ;)
This commit is contained in:
Bastien Montagne
2013-08-23 15:17:54 +00:00
parent 09ff49755f
commit 25ca762238
1 changed files with 10 additions and 20 deletions
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22
source/blender/editors/space_graph/graph_edit.c
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@@ -1676,7 +1676,7 @@ static int graphkeys_euler_filter_exec(bContext *C, wmOperator *op)
/* FIXME: there are more complicated methods that will be needed to fix more cases than just some */
for (f = 0; f < 3; f++) {
FCurve *fcu = euf->fcurves[f];
BezTriple *bezt, *prev = NULL;
BezTriple *bezt, *prev;
unsigned int i;
/* skip if not enough vets to do a decent analysis of... */
@@ -1684,31 +1684,21 @@ static int graphkeys_euler_filter_exec(bContext *C, wmOperator *op)
continue;
/* prev follows bezt, bezt = "current" point to be fixed */
for (i = 0, bezt = fcu->bezt; i < fcu->totvert; i++, prev = bezt, bezt++) {
/* our method depends on determining a "difference" from the previous vert */
if (prev == NULL)
continue;
for (i = 1, prev = fcu->bezt, bezt = fcu->bezt + 1; i < fcu->totvert; i++, prev = bezt++) {
const float sign = (prev->vec[1][1] > bezt->vec[1][1]) ? 1.0f : -1.0f;
/* > 180 degree flip? */
if (fabs(prev->vec[1][1] - bezt->vec[1][1]) >= M_PI) {
if ((sign * (prev->vec[1][1] - bezt->vec[1][1])) >= (float)M_PI) {
/* 360 degrees to add/subtract frame value until difference is acceptably small that there's no more flip */
const float fac = 2.0f * (float)M_PI;
const float fac = sign * 2.0f * (float)M_PI;
if (prev->vec[1][1] > bezt->vec[1][1]) {
while (fabsf(bezt->vec[1][1] - prev->vec[1][1]) >= (float)M_PI) {
while ((sign * (prev->vec[1][1] - bezt->vec[1][1])) >= (float)M_PI) {
bezt->vec[0][1] += fac;
bezt->vec[1][1] += fac;
bezt->vec[2][1] += fac;
}
}
else { /* if (prev->vec[1][1] < bezt->vec[1][1]) */
while (fabsf(bezt->vec[1][1] - prev->vec[1][1]) >= (float)M_PI) {
bezt->vec[0][1] -= fac;
bezt->vec[1][1] -= fac;
bezt->vec[2][1] -= fac;
}
}
}
}
}
}