1 files changed, 48 insertions, 0 deletions
diff --git a/src/lua5/im_fftw.lua b/src/lua5/im_fftw.lua
new file mode 100644
index 0000000..e57c7bf
--- /dev/null
+++ b/src/lua5/im_fftw.lua
@@ -0,0 +1,48 @@
+
+-------------------------------------------------------------------------------
+-- Creates a new function, with the name suffixed by "New". This new function
+-- creates a new image, based on a source image, and calls the previous function
+-- with this new image.
+
+local function OneSourceOneDest (funcname, width, height, color_space, data_type)
+  local func = im[funcname]
+  assert(func) -- see if function is really defined
+
+  -- define function with "New" suffix
+  im[funcname.."New"] = function (src_image, ...)
+    -- create destination image
+    local dst_image = im.ImageCreateBased(src_image, width, height, color_space, data_type)
+
+    -- call previous method, repassing all parameters
+    func(src_image, dst_image, unpack(arg))
+    return dst_image
+  end
+end
+
+-------------------------------------------------------------------------------
+-- This function is similar to OneSourceOneDest, but it receives two source
+-- images.
+
+local function TwoSourcesOneDest (funcname, width, height, color_space, data_type)
+  local func = im[funcname]
+  
+  -- see if function is really defined
+  assert(func, string.format("undefined function `%s'", funcname))
+
+  -- define function with "New" suffix
+  im[funcname.."New"] = function (src_image1, src_image2, ...)
+    -- create destination image
+    local dst_image = im.ImageCreateBased(src_image1, width, height, color_space, data_type)
+
+    -- call previous method, repassing all parameters
+    func(src_image1, src_image2, dst_image, unpack(arg))
+    return dst_image
+  end
+end
+
+-------------------------------------------------------------------------------
+
+TwoSourcesOneDest("ProcessCrossCorrelation")
+OneSourceOneDest("ProcessAutoCorrelation", nil, nil, nil, im.CFLOAT)
+OneSourceOneDest("ProcessFFT")
+OneSourceOneDest("ProcessIFFT")