Dev/matterhorn decoder (#324)

- reshape image directly in decoder such that first dimension is num
counters
- take into account chip artefact in decoder.

---------

Co-authored-by: Erik Fröjdh <erik.frojdh@psi.ch>

src/PixelMap.cpp

@@ -195,12 +195,16 @@ NDArray<ssize_t, 2> GenerateMatterhorn10PixelMap(const size_t dynamic_range,
 
     constexpr size_t num_64_bit_packages = 4; // n_cols/64
 
+    constexpr size_t half_rows = n_rows / 2; // 128
+
     const size_t num_consecutive_pixels_in_package =
         packet_size / num_consecutive_pixels;
 
     for (size_t row = 0; row < n_rows; ++row) {
         for (size_t counter = 0; counter < n_counters; ++counter) {
             size_t col = 0;
+            size_t actual_counter =
+                row < half_rows ? counter : (n_counters - counter - 1);
             for (size_t package = 0; package < num_64_bit_packages; ++package) {
                 for (size_t consecutive_pixel_group = 0;
                      consecutive_pixel_group <
@@ -213,7 +217,7 @@ NDArray<ssize_t, 2> GenerateMatterhorn10PixelMap(const size_t dynamic_range,
                             consecutive_pixel_group * num_64_bit_packages *
                                 num_consecutive_pixels +
                             pixel + row * n_cols * n_counters +
-                            n_cols * counter;
+                            n_cols * actual_counter;
                         ++col;
                     }
                 }