add return type in build default spec function (CLI).

Set applyGrid function to not build a new Bitmap (like previous commits) in preparation of a new (temp.) test branch.

DeathSocket/GridPainter.fs

@@ -3,6 +3,8 @@ namespace DeathSocket
     open System.IO
 
     /// Provides functions which help draw gridded overlays onto images.
+    /// Grid Painter, and all of Death Socket, uses the System.Drawing brushes/colours.
+    /// If you are using System.Media brushes and colour, you will need to convert them.
     module GridPainter =
 
         open Validation
@@ -43,6 +45,7 @@ namespace DeathSocket
         /// <param name="width">The width of the image.</param>
         /// <param name="height">The height of the image.</param>
         /// <param name="rows">The number of rows the grid should have.</param>
+        /// <remarks>You will probably only need these when dealing with GUI's.</remarks>
         let determineHorizontalLines width height rows =
             createHorizontalLines width height rows
 
@@ -53,5 +56,6 @@ namespace DeathSocket
         /// <param name="width">The width of the image.</param>
         /// <param name="height">The height of the image.</param>
         /// <param name="columns">The number of columns the grid should have.</param>
+        /// <remarks>You will probably only need these when dealing with GUI's.</remarks>
         let determineVerticalLines width height columns =
             createVerticalLines width height columns

DeathSocket/ImageServices.fs

@@ -3,6 +3,7 @@
     open System.Drawing
     open System.Drawing.Imaging
     open DeathSocket
+    open System.Drawing.Drawing2D
 
     let createHorizontalLines width height rows =
         let interval = height / rows
@@ -17,16 +18,16 @@
                Point ((interval * point), height)|]|]
 
     let drawGrid spec =
-        // The originalImg is for images with indexed pixels.
-        use orignialImg = Bitmap.FromFile spec.originalPath
-        use img = new Bitmap (orignialImg.Width, orignialImg.Height)
-        use graphics = Graphics.FromImage img
-        graphics.DrawImage (orignialImg, 0, 0)
-        use pen = new Pen (spec.colour, width = spec.penWidth)
+        let img = Bitmap.FromFile spec.originalPath
+        let graphics = Graphics.FromImage(img)
+        let pen = new Pen (spec.colour, width = spec.penWidth)
         let horizontalLines =
             createHorizontalLines (img.Size.Width) (img.Size.Height) (spec.rows)
         let verticalLines =
             createVerticalLines (img.Size.Width) (img.Size.Height) (spec.columns)
         for line in horizontalLines do graphics.DrawLines (pen, line)
         for line in verticalLines do graphics.DrawLines (pen, line)
-        img.Save (spec.savePath, ImageFormat.Png)
+        img.Save (spec.savePath)
+        img.Dispose()
+        graphics.Dispose()
+        pen.Dispose()

DeathSocketCLI/Validation.fs

@@ -48,8 +48,8 @@
           columns = numColumns }
 
     let buildDefaultSpec imgPath newPath =
-        let stream = new FileStream (imgPath, FileMode.Open)
-        let image = Image.FromStream (stream, false, false)
+        use stream = new FileStream (imgPath, FileMode.Open)
+        use image = Image.FromStream (stream, false, false)
         let spec =
             { originalPath = imgPath
               savePath = newPath
@@ -58,4 +58,5 @@
               rows = 10
               columns = 10 }
         stream.Dispose ()
-        image.Dispose ()
+        image.Dispose ()
+        spec