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Bugfix: memory corruption in BridgeDetector (thanks @JakeQZ for the patch). #3267

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This commit is contained in:
Alessandro Ranellucci 2016-03-13 21:12:31 +01:00
parent 0964700e6d
commit 38d9acbbfb
1 changed files with 21 additions and 12 deletions
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33
xs/src/libslic3r/BridgeDetector.cpp
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@ -7,20 +7,16 @@ namespace Slic3r {
class BridgeDirectionComparator {
public:
std::map<double,double> dir_coverage, dir_avg_length; // angle => score
std::map<double,double> dir_coverage; // angle => score
BridgeDirectionComparator(double _extrusion_width)
: extrusion_width(_extrusion_width) {};
: extrusion_width(_extrusion_width)
{};
// the best direction is the one causing most lines to be bridged (thus most coverage)
// and shortest max line length
bool operator() (double a, double b) {
double coverage_diff = this->dir_coverage[a] - this->dir_coverage[b];
if (fabs(coverage_diff) < this->extrusion_width) {
return (this->dir_avg_length[b] > this->dir_avg_length[a]);
} else {
return (coverage_diff > 0);
}
// Initial sort by coverage only - comparator must obey strict weak ordering
return (this->dir_coverage[a] > this->dir_coverage[b]);
};
private:
@ -113,6 +109,7 @@ BridgeDetector::detect_angle()
angles.pop_back();
BridgeDirectionComparator bdcomp(this->extrusion_width);
std::map<double,double> dir_avg_length;
double line_increment = this->extrusion_width;
bool have_coverage = false;
for (std::vector<double>::const_iterator angle = angles.begin(); angle != angles.end(); ++angle) {
@ -164,7 +161,7 @@ BridgeDetector::detect_angle()
// $directions_coverage{$angle} = sum(map $_->area, @{$self->coverage($angle)}) // 0;
// max length of bridged lines
bdcomp.dir_avg_length[*angle] = !lengths.empty()
dir_avg_length[*angle] = !lengths.empty()
? *std::max_element(lengths.begin(), lengths.end())
: 0;
}
@ -172,10 +169,22 @@ BridgeDetector::detect_angle()
// if no direction produced coverage, then there's no bridge direction
if (!have_coverage) return false;
// sort directions by score
// sort directions by coverage - most coverage first
std::sort(angles.begin(), angles.end(), bdcomp);
this->angle = angles.front();
// if any other direction is within extrusion width of coverage, prefer it if shorter
// TODO: There are two options here - within width of the angle with most coverage, or within width of the currently perferred?
double most_coverage_angle = this->angle;
for (std::vector<double>::const_iterator angle = angles.begin() + 1;
angle != angles.end() && bdcomp.dir_coverage[most_coverage_angle] - bdcomp.dir_coverage[*angle] < this->extrusion_width;
++angle
) {
if (dir_avg_length[*angle] < dir_avg_length[this->angle]) {
this->angle = *angle;
}
}
if (this->angle >= PI) this->angle -= PI;
#ifdef SLIC3R_DEBUG