Update package.d doc for median filter example

Author: aferust

source/mir/ndslice/package.d

@@ -360,8 +360,8 @@ Returns:
  where с is the number of channels in the image.
  Dense data layout is guaranteed.
 +/
-Slice!(ubyte*, 3) movingWindowByChannel
-(Slice!(Universal, [3], ubyte*) image, size_t nr, size_t nc, ubyte delegate(Slice!(Universal, [2], ubyte*)) filter)
+Slice!(C*, 3) movingWindowByChannel(alias filter, C)
+(Slice!(C*, 3, Universal) image, size_t nr, size_t nc)
 {
  // 0. 3D
  // The last dimension represents the color channel.
@@ -374,10 +374,12 @@ Slice!(ubyte*, 3) movingWindowByChannel
  .windows(nr, nc)
  // 3. 5D
  // Unpacks the windows.
- .unpack
- .transposed!(0, 1, 4)
+ .unpack.unpack
  // 4. 5D
  // Brings the color channel dimension to the third position.
+ .transposed!(0, 1, 4)
+ // 5. 3D Composed of 2D
+ // Packs the last two dimensions.
  .pack!2
  // 2D to pixel lazy conversion.
  .map!filter
@@ -397,12 +399,15 @@ Params:
 Returns:
  median value over the range `r`
 +/
-T median(Range, T)(Slice!(Universal, [2], Range) sl, T[] buf)
+T median(Iterator, SliceKind kind, T)(Slice!(Iterator, 2, kind) sl, T[] buf)
 {
  import std.algorithm.sorting : topN;
  // copy sl to the buffer
  auto retPtr = reduce!(
- (ptr, elem) { *ptr = elem; return ptr + 1;} )(buf.ptr, sl);
+ (ptr, elem) {
+ *ptr = elem;
+ return ptr + 1;
+ } )(buf.ptr, sl);
  auto n = retPtr - buf.ptr;
  buf[0 .. n].topN(n / 2);
  return buf[n / 2];
@@ -414,9 +419,9 @@ The `main` function:
 -------
 void main(string[] args)
 {
- import std.conv : to;
- import std.getopt : getopt, defaultGetoptPrinter;
- import std.path : stripExtension;
+ import std.conv: to;
+ import std.getopt: getopt, defaultGetoptPrinter;
+ import std.path: stripExtension;
 
  uint nr, nc, def = 3;
  auto helpInformation = args.getopt(
@@ -434,6 +439,12 @@ void main(string[] args)
 
  auto buf = new ubyte[nr * nc];
 
+ if (args.length == 1)
+ {
+ import std.stdio: writeln;
+ writeln("No input file given");
+ }
+
  foreach (name; args[1 .. $])
  {
  import imageformats; // can be found at code.dlang.org
@@ -442,6 +453,7 @@ void main(string[] args)
 
  auto ret = image.pixels
  .sliced(cast(size_t)image.h, cast(size_t)image.w, cast(size_t)image.c)
+ .universal
  .movingWindowByChannel
  !(window => median(window, buf))
  (nr, nc);
@@ -450,7 +462,7 @@ void main(string[] args)
  name.stripExtension ~ "_filtered.png",
  ret.length!1,
  ret.length!0,
- (&ret[0, 0, 0])[0 .. ret.elementCount]);
+ ret.field);
  }
 }
 -------