- const uint64_t samplerate = _data->get_samplerate();
- const int64_t start_time = _data->get_start_time();
- const float samples_per_pixel = samplerate * scale / 1e15f;
- const int64_t start = samplerate * (offset - start_time) /
- 1000000000000000ULL;
- const int64_t end = start + samples_per_pixel * rect.width();
+ 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);