+ double scale, double offset)
+{
+ Point2F *vertex;
+
+ vector< pair<int64_t, bool> > edges;
+
+ assert(scale > 0);
+ assert(_data);
+
+ const float high_offset = rect.top() + Margin;
+ const float low_offset = rect.bottom() - Margin;
+
+ const queue< shared_ptr<LogicDataSnapshot> > &snapshots =
+ _data->get_snapshots();
+ if(snapshots.empty())
+ return;
+
+ const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
+
+ const double pixels_offset = offset / scale;
+ const double samplerate = _data->get_samplerate();
+ const double start_time = _data->get_start_time();
+ const int64_t last_sample = (int64_t)snapshot->get_sample_count() - 1;
+ const double samples_per_pixel = samplerate * scale;
+ const int64_t start = min(max((int64_t)(samplerate * (offset - start_time)),
+ (int64_t)0), last_sample);
+ const int64_t end = min((int64_t)(start + samples_per_pixel * rect.width()),
+ last_sample);
+ const int64_t quantization_length = 1LL << (int64_t)floorf(
+ max(logf(samples_per_pixel / Log2), 0.0f));
+
+ snapshot->get_subsampled_edges(edges, start, end,
+ quantization_length, _probe_index);
+
+ // Paint the edges
+ const unsigned int edge_point_count = (edges.size() - 2) * 2;
+ Point2F *const edge_points = new Point2F[edge_point_count];
+ vertex = edge_points;
+
+ for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1;
+ i != edges.end() - 1; i++)
+ {
+ const int x = (int)((*i).first / samples_per_pixel - pixels_offset) +
+ rect.left();
+
+ vertex->x = x, vertex->y = high_offset;
+ vertex++;
+ vertex->x = x, vertex->y = low_offset;
+ vertex++;
+ }
+
+ glColor3fv(EdgeColour);
+ paint_lines(edge_points, edge_point_count);
+ delete[] edge_points;
+
+ // Paint the caps
+ const unsigned int max_cap_point_count = (edges.size() - 1) * 2;
+ Point2F *const cap_points = new Point2F[max_cap_point_count];
+
+ glColor3fv(HighColour);
+ paint_caps(cap_points, edges, true, samples_per_pixel,
+ pixels_offset, rect.left(), high_offset);
+ glColor3fv(LowColour);
+ paint_caps(cap_points, edges, false, samples_per_pixel,
+ pixels_offset, rect.left(), low_offset);
+
+ delete[] cap_points;
+}
+
+int LogicSignal::paint_caps(Point2F *const cap_points,
+ vector< pair<int64_t, bool> > &edges, bool level,
+ double samples_per_pixel, double pixels_offset, int x_offset,
+ int y_offset)
+{
+ Point2F *vertex = cap_points;
+
+ for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin();
+ i != (edges.end() - 1); i++)
+ if((*i).second == level)
+ {
+ vertex->x = (int)((*i).first / samples_per_pixel -
+ pixels_offset) + x_offset - 1;
+ vertex->y = y_offset;
+ vertex++;
+
+ vertex->x = (int)((*(i+1)).first / samples_per_pixel -
+ pixels_offset) + x_offset;
+ vertex->y = y_offset;
+ vertex++;
+ }
+
+ paint_lines(cap_points, vertex - cap_points);
+}
+
+void LogicSignal::paint_lines(Point2F *points, int count)