3 files changed, 59 insertions, 1 deletions
diff --git a/julia/CrystFEL/src/CrystFEL.jl b/julia/CrystFEL/src/CrystFEL.jl
index 859c8833..5afa9920 100644
--- a/julia/CrystFEL/src/CrystFEL.jl
+++ b/julia/CrystFEL/src/CrystFEL.jl
@@ -15,6 +15,10 @@ include("detgeom.jl")
 using .DetGeoms
 export Panel, DetGeom
 
+include("image.jl")
+using .Images
+export Image
+
 include("symmetry.jl")
 using .Symmetry
 export SymOpList
diff --git a/julia/CrystFEL/src/detgeom.jl b/julia/CrystFEL/src/detgeom.jl
index 622883ad..d394ee7b 100644
--- a/julia/CrystFEL/src/detgeom.jl
+++ b/julia/CrystFEL/src/detgeom.jl
@@ -37,6 +37,13 @@ mutable struct Panel
 end
 
 
+mutable struct DetGeom
+    panels::Ptr{Panel}
+    n_panels::Cint
+    top_group::Ptr{Cvoid}
+end
+
+
 """
     Panel(name, width, height, (cnx, cny), clen, (fsx,fsy,fsz), (ssx,ssy,ssz), pixelsize, aduperphoton)
 
@@ -97,7 +104,20 @@ end
 Create a CrystFEL `DetGeom` from a vector of `Panel`s.  Optionally set the
 panel group which should be the top of the hierarchy.
 """
-function DetGeom(panels; topgroup=nothing)
+function DetGeom(panels; topgroup=C_NULL)
+
+    pmem = Base.Libc.malloc(sizeof(panels[1])*length(panels))
+
+    for (i,panel) in enumerate(panels)
+        Base.unsafe_copyto!(pmem, pointer(panel), 1)
+    end
+
+    dg = DetGeom(pmem, length(panels), topgroup)
+
+    finalize(dg) do x
+        Base.Libc.free(dg.panels)
+    end
+
 end
 
 end  # of module
diff --git a/julia/CrystFEL/src/image.jl b/julia/CrystFEL/src/image.jl
new file mode 100644
index 00000000..e73e5f9a
--- /dev/null
+++ b/julia/CrystFEL/src/image.jl
@@ -0,0 +1,34 @@
+module Images
+export Image
+
+guardian = []
+
+function protect(guardian, obj)
+    push!(guardian, obj)
+    obj
+end
+
+function unprotect(guardian, obj)
+    let pos = findfirst(==(obj), guardian)
+        if pos !== nothing
+            deleteat!(guardian, pos)
+        end
+    end
+end
+
+
+mutable struct Image
+end
+
+
+"""
+    Image()
+
+Create a CrystFEL image structure
+"""
+function Image(panels)
+
+
+end
+
+end  # of module