Implemented Tango.RemoteDesktop.

Implemented png 8 bit quantization.
Implemented RasterFrame bounds clipping.
Refactored VectorFrame to use indexed colors.

1 files changed, 129 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Tango.RemoteDesktop/Comparers/VectorBitmapComparer.cs b/Software/Visual_Studio/Tango.RemoteDesktop/Comparers/VectorBitmapComparer.cs
new file mode 100644
index 000000000..2500e8ac7
--- /dev/null
+++ b/Software/Visual_Studio/Tango.RemoteDesktop/Comparers/VectorBitmapComparer.cs
@@ -0,0 +1,129 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Media.Imaging;
+using Tango.RemoteDesktop.Frames;
+
+namespace Tango.RemoteDesktop.Comparers
+{
+    /// <summary>
+    /// Represents a vector <see cref="IBitmapComparer{TFrame}"/> comparer which will compare and return a <see cref="VectorFrame"/> difference.
+    /// </summary>
+    /// <seealso cref="Tango.RemoteDesktop.IBitmapComparer{Tango.RemoteDesktop.Frames.VectorFrame}" />
+    public class VectorBitmapComparer : IBitmapComparer<VectorFrame>
+    {
+        /// <summary>
+        /// Creates the difference as <see cref="VectorFrame"/>.
+        /// </summary>
+        /// <param name="previousBitmap">The previous bitmap.</param>
+        /// <param name="currentBitmap">The current bitmap.</param>
+        /// <returns></returns>
+        /// <exception cref="InvalidOperationException">
+        /// Cannot compare image. They are the same instance
+        /// or
+        /// Cannot compare image of different size.
+        /// </exception>
+        public unsafe BitmapComparerResult<VectorFrame> CreateDifference(Bitmap previousBitmap, Bitmap currentBitmap)
+        {
+            VectorFrame vector = new VectorFrame(previousBitmap.Width, previousBitmap.Height);
+
+            bool hasDifference = false;
+
+            if (previousBitmap == null | currentBitmap == null)
+                throw new InvalidOperationException("Cannot compare image. They are the same instance");
+
+            if (previousBitmap.Height != currentBitmap.Height || previousBitmap.Width != currentBitmap.Width)
+                throw new InvalidOperationException("Cannot compare image of different size.");
+
+            int height = previousBitmap.Height;
+            int width = previousBitmap.Width;
+
+            BitmapData data1 = previousBitmap.LockBits(new Rectangle(0, 0, width, height),
+                                               ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
+            BitmapData data2 = currentBitmap.LockBits(new Rectangle(0, 0, width, height),
+                                               ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
+            byte* data1Ptr = (byte*)data1.Scan0;
+            byte* data2Ptr = (byte*)data2.Scan0;
+
+            int rowPadding = data1.Stride - (previousBitmap.Width * 4);
+
+            // iterate over height (rows)
+            for (int i = 0; i < height; i++)
+            {
+                // iterate over width (columns)
+                for (int j = 0; j < width; j++)
+                {
+                    int same = 0;
+
+                    byte[] tmp = new byte[4];
+
+                    // compare pixels and copy new values into temporary array
+                    for (int x = 0; x < 4; x++)
+                    {
+                        tmp[x] = data2Ptr[0];
+                        if (data1Ptr[0] == data2Ptr[0])
+                        {
+                            same++;
+                        }
+                        data1Ptr++; // advance image1 ptr
+                        data2Ptr++; // advance image2 ptr
+                    }
+
+                    if (same != 4)
+                    {
+                        int colorIndex = vector.Colors.Count;
+
+                        VectorFrameColor color = new VectorFrameColor()
+                        {
+                            B = tmp[0],
+                            G = tmp[1],
+                            R = tmp[2],
+                            Index = colorIndex
+                        };
+
+                        VectorFrameColor existingColor;
+
+                        if (vector.Colors.TryGetValue(color.ToInt32(), out existingColor))
+                        {
+                            colorIndex = existingColor.Index;
+                        }
+                        else
+                        {
+                            vector.Colors.Add(color.ToInt32(), color);
+                        }
+
+                        vector.Pixels.Add(new VectorFramePixel()
+                        {
+                            X = j,
+                            Y = i,
+                            ColorIndex = colorIndex,
+                            Color = color
+                        });
+
+                        hasDifference = true;
+                    }
+                }
+
+                // at the end of each column, skip extra padding
+                if (rowPadding > 0)
+                {
+                    data1Ptr += rowPadding;
+                    data2Ptr += rowPadding;
+                }
+            }
+
+            previousBitmap.UnlockBits(data1);
+            currentBitmap.UnlockBits(data2);
+
+            return new BitmapComparerResult<VectorFrame>()
+            {
+                Frame = vector,
+                ContainsDifference = hasDifference
+            };
+        }
+    }
+}