v1.0.0-rc.179 (#90)

* Rugnux: Stills processing needs only the unit cell and space group beyond what the file records - detector distance, beam centre, tilt, panel placement, saturation level, gain and polarisation plane are found from the images - and is up to twice as fast.
* Rugnux: Stills can be indexed without a GPU, with a CPU implementation of the fast-feedback indexer (macOS, computers without a GPU).
* Rugnux: Rotation and stills data are integrated in the detector's own units with one gain model, improving data from CCD detectors.
* Web frontend: The Rugnux live page shows the placed model with its electron density and anomalous difference map in a Mol* viewer.

Reviewed-on: #90
Co-authored-by: Filip Leonarski <filip.leonarski@psi.ch>

tests/AdaptiveThresholdTest.cpp

@@ -93,19 +93,31 @@ TEST_CASE("AdaptiveThreshold_RingThreshold", "[SpotFinding]") {
     for (const float mean: {0.0f, 0.5f, 5.0f, 50.0f}) {
         for (const float sigma: {0.0f, 1.0f, 7.0f}) {
             const float gauss = mean + z * std::sqrt(sigma * sigma + READ * READ);
-            CHECK(RingThreshold(mean, sigma, p, z) >= Catch::Approx(gauss).epsilon(1e-6));
+            CHECK(RingThreshold(mean, sigma, p, z, 1.0f) >= Catch::Approx(gauss).epsilon(1e-6));
         }
     }
-    CHECK(RingThreshold(0.0f, 0.0f, p, z) >= z * READ);
+    CHECK(RingThreshold(0.0f, 0.0f, p, z, 1.0f) >= z * READ);
 
     // Non-decreasing in the background mean and in the background scatter.
-    CHECK(RingThreshold(20.0f, 4.0f, p, z) > RingThreshold(2.0f, 4.0f, p, z));
-    CHECK(RingThreshold(5.0f, 9.0f, p, z) > RingThreshold(5.0f, 1.0f, p, z));
+    CHECK(RingThreshold(20.0f, 4.0f, p, z, 1.0f) > RingThreshold(2.0f, 4.0f, p, z, 1.0f));
+    CHECK(RingThreshold(5.0f, 9.0f, p, z, 1.0f) > RingThreshold(5.0f, 1.0f, p, z, 1.0f));
 
     // Where the background is countable and quiet, Poisson significance is the binding arm: a ring
     // with mean 1 and no measured scatter must still demand several photons.
-    CHECK(RingThreshold(1.0f, 0.0f, p, z) > 1.0f + z * READ);
+    CHECK(RingThreshold(1.0f, 0.0f, p, z, 1.0f) > 1.0f + z * READ);
 
     // A ring whose scatter is far above Poisson (flat-field / read excess) is set by the Gaussian arm.
-    CHECK(RingThreshold(10.0f, 30.0f, p, z) == Catch::Approx(10.0f + z * std::sqrt(900.0f + READ * READ)).epsilon(1e-6));
+    CHECK(RingThreshold(10.0f, 30.0f, p, z, 1.0f) == Catch::Approx(10.0f + z * std::sqrt(900.0f + READ * READ)).epsilon(1e-6));
+}
+
+TEST_CASE("AdaptiveThreshold_RingThreshold_Gain", "[SpotFinding]") {
+    const double p = 1e-5;
+    const float z = static_cast<float>(NormalQuantile(1.0 - p));
+    // A frame in detector units, g of them to a photon, is thresholded as its photons would be: the same
+    // threshold, g times over, for the background and scatter g times over.
+    for (const float g: {3.0f, 12.0f})
+        for (const float mean: {0.0f, 0.05f, 1.0f, 5.0f, 300.0f})
+            for (const float sigma: {0.0f, 1.0f, 7.0f})
+                CHECK(RingThreshold(g * mean, g * sigma, p, z, g)
+                      == Catch::Approx(g * RingThreshold(mean, sigma, p, z, 1.0f)).epsilon(1e-5));
 }