Mask now accepts position instructions

Former-commit-id: 8e40db9486bd08d8dcf2850604d3e5f40dfeaee1
Former-commit-id: 803d99ed0ff547a62870e458ef95e918f31cf93f

src/ImageProcessor.Playground/Program.cs

@@ -49,8 +49,8 @@ namespace ImageProcessor.PlayGround
                 di.Create();
             }
 
-            Image mask = Image.FromFile(Path.Combine(resolvedPath, "mask.png"));
-            IEnumerable<FileInfo> files = GetFilesByExtensions(di, ".png");
+            Image mask = Image.FromFile(Path.Combine(resolvedPath, "mask2.png"));
+            IEnumerable<FileInfo> files = GetFilesByExtensions(di, ".jpg");
             //IEnumerable<FileInfo> files = GetFilesByExtensions(di, ".gif", ".webp", ".bmp", ".jpg", ".png", ".tif");
 
             foreach (FileInfo fileInfo in files)
@@ -66,7 +66,7 @@ namespace ImageProcessor.PlayGround
                 {
                     using (ImageFactory imageFactory = new ImageFactory(true))
                     {
-                        Size size = new Size(400, 0);
+                        Size size = new Size(800, 0);
                         ResizeLayer layer = new ResizeLayer(size, ResizeMode.Max, AnchorPosition.Center, false);
 
                         //ContentAwareResizeLayer layer = new ContentAwareResizeLayer(size)
@@ -78,16 +78,17 @@ namespace ImageProcessor.PlayGround
                             //.BackgroundColor(Color.White)
                             //.Resize(new Size((int)(size.Width * 1.1), 0))
                             //.ContentAwareResize(layer)
-                            //.Constrain(size)
-                            //.Mask(mask)
+                            .Constrain(size)
+                            .Mask(mask)
+                            //.Format(new PngFormat())
                             //.BackgroundColor(Color.HotPink)
                             //.ReplaceColor(Color.FromArgb(255, 1, 107, 165), Color.FromArgb(255, 1, 165, 13), 80)
                             //.Resize(layer)
                             //.DetectEdges(new SobelEdgeFilter(), false)
                             //.DetectEdges(new LaplacianOfGaussianEdgeFilter())
-                            .EntropyCrop()
+                            //.EntropyCrop()
                             //.Filter(MatrixFilters.Invert)
-                            //.Filter(MatrixFilters.Comic)
+                            .Filter(MatrixFilters.Comic)
                             //.Filter(MatrixFilters.HiSatch)
                             //.Pixelate(8)
                             //.GaussianSharpen(10)

src/ImageProcessor/ImageFactory.cs

@@ -671,20 +671,23 @@ namespace ImageProcessor
         }
 
         /// <summary>
-        /// Applies the given image mask to the current image. If the mask is not the same size as the image 
-        /// it will be centered against the image.
+        /// Applies the given image mask to the current image.
         /// </summary>
         /// <param name="imageMask">
         /// The image containing the mask to apply.
         /// </param>
+        /// <param name="point">
+        /// The <see cref="Point"/> to place the mask if it not the same dimensions as the original image.
+        /// If no position is set, the mask will be centered within the image.
+        /// </param>
         /// <returns>
         /// The current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class.
         /// </returns>
-        public ImageFactory Mask(Image imageMask)
+        public ImageFactory Mask(Image imageMask, Point? point = null)
         {
             if (this.ShouldProcess)
             {
-                Mask mask = new Mask { DynamicParameter = imageMask };
+                Mask mask = new Mask { DynamicParameter = new Tuple<Image, Point?>(imageMask, point) };
                 this.CurrentImageFormat.ApplyProcessor(mask.ProcessImage, this);
             }
 

src/ImageProcessor/Imaging/Filters/Photo/ComicMatrixFilter.cs

@@ -92,12 +92,12 @@ namespace ImageProcessor.Imaging.Filters.Photo
                     // Create the pattern mask.
                     using (Graphics graphics = Graphics.FromImage(patternBitmap))
                     {
-                        graphics.Clear(Color.Black);
+                        graphics.Clear(Color.Transparent);
                         graphics.SmoothingMode = SmoothingMode.HighQuality;
 
-                        for (int y = 0; y < image.Height; y += 8)
+                        for (int y = 0; y < height; y += 8)
                         {
-                            for (int x = 0; x < image.Width; x += 4)
+                            for (int x = 0; x < width; x += 4)
                             {
                                 graphics.FillEllipse(Brushes.White, x, y, 3, 3);
                                 graphics.FillEllipse(Brushes.White, x + 2, y + 4, 3, 3);

src/ImageProcessor/Imaging/Helpers/Effects.cs

@@ -155,7 +155,7 @@ namespace ImageProcessor.Imaging.Helpers
 
                                 if (sourceColor.A != 0)
                                 {
-                                    sourceBitmap.SetPixel(x, y, Color.FromArgb(maskColor.B, sourceColor.R, sourceColor.G, sourceColor.B));
+                                    sourceBitmap.SetPixel(x, y, Color.FromArgb(maskColor.A, sourceColor.R, sourceColor.G, sourceColor.B));
                                 }
 
                                 // ReSharper restore AccessToDisposedClosure

src/ImageProcessor/Imaging/Helpers/ImageMaths.cs

@@ -145,10 +145,10 @@ namespace ImageProcessor.Imaging.Helpers
 
             using (FastBitmap fastBitmap = new FastBitmap(bitmap))
             {
-                topLeft.Y = getMinY(fastBitmap) + 1;
-                topLeft.X = getMinX(fastBitmap) + 1;
-                bottomRight.Y = getMaxY(fastBitmap);
-                bottomRight.X = getMaxX(fastBitmap);
+                topLeft.Y = getMinY(fastBitmap);
+                topLeft.X = getMinX(fastBitmap);
+                bottomRight.Y = getMaxY(fastBitmap) + 1;
+                bottomRight.X = getMaxX(fastBitmap) + 1;
             }
 
             return ImageMaths.GetBoundingRectangle(topLeft, bottomRight);

src/ImageProcessor/Processors/Mask.cs

@@ -15,6 +15,7 @@ namespace ImageProcessor.Processors
     using System.Drawing;
 
     using ImageProcessor.Common.Exceptions;
+    using ImageProcessor.Imaging.Colors;
     using ImageProcessor.Imaging.Helpers;
 
     /// <summary>
@@ -63,30 +64,67 @@ namespace ImageProcessor.Processors
         {
             Bitmap newImage = null;
             Bitmap mask = null;
-            Bitmap maskResized = null;
+            Bitmap maskCropped = null;
+            Bitmap maskPositioned = null;
             Image image = factory.Image;
 
             try
             {
                 int width = image.Width;
                 int height = image.Height;
-                mask = new Bitmap(this.DynamicParameter);
-                Rectangle parent = new Rectangle(0, 0, width, height);
-                Rectangle child = new Rectangle(0, 0, mask.Width, mask.Height);
-                RectangleF centered = ImageMaths.CenteredRectangle(parent, child);
-
-                // Resize the mask to the size of the input image so that we can apply it.
-                maskResized = new Bitmap(width, height);
-                using (Graphics graphics = Graphics.FromImage(maskResized))
+                Tuple<Image, Point?> parameters = this.DynamicParameter;
+                mask = new Bitmap(parameters.Item1);
+                Point? position = parameters.Item2.HasValue ? parameters.Item2 : null;
+
+                if (mask.Size != image.Size)
                 {
-                    graphics.Clear(Color.Transparent);
-                    graphics.DrawImage(mask, new PointF(centered.X, centered.Y));
-                }
+                    Rectangle parent = new Rectangle(0, 0, width, height);
+                    Rectangle child = ImageMaths.GetFilteredBoundingRectangle(mask, 0, RgbaComponent.A);
+                    maskCropped = new Bitmap(child.Width, child.Height);
+
+                    // First crop any bounding transparency.
+                    using (Graphics graphics = Graphics.FromImage(maskCropped))
+                    {
+                        graphics.Clear(Color.Transparent);
+                        graphics.DrawImage(
+                                         mask,
+                                         new Rectangle(0, 0, child.Width, child.Height),
+                                         child.X,
+                                         child.Y,
+                                         child.Width,
+                                         child.Height,
+                                         GraphicsUnit.Pixel);
+                    }
 
-                newImage = Effects.ApplyMask(image, maskResized);
+                    // Now position the mask in an image of the same dimensions as the original.
+                    maskPositioned = new Bitmap(width, height);
+                    using (Graphics graphics = Graphics.FromImage(maskPositioned))
+                    {
+                        graphics.Clear(Color.Transparent);
+
+                        if (position != null)
+                        {
+                            // Apply the mask at the given position.
+                            graphics.DrawImage(maskCropped, position.Value);
+                        }
+                        else
+                        {
+                            // Center it instead
+                            RectangleF centered = ImageMaths.CenteredRectangle(parent, child);
+                            graphics.DrawImage(maskCropped, new PointF(centered.X, centered.Y));
+                        }
+                    }
+
+                    newImage = Effects.ApplyMask(image, maskPositioned);
+                    maskCropped.Dispose();
+                    maskPositioned.Dispose();
+                }
+                else
+                {
+                    newImage = Effects.ApplyMask(image, mask);
+                    mask.Dispose();
+                }
 
-                mask.Dispose();
-                maskResized.Dispose();
                 image.Dispose();
                 image = newImage;
             }
@@ -97,9 +135,14 @@ namespace ImageProcessor.Processors
                     mask.Dispose();
                 }
 
-                if (maskResized != null)
+                if (maskCropped != null)
+                {
+                    maskCropped.Dispose();
+                }
+
+                if (maskPositioned != null)
                 {
-                    maskResized.Dispose();
+                    maskPositioned.Dispose();
                 }
 
                 if (newImage != null)