Implemented Tango.RemoteDesktop.

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

3 files changed, 270 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/BitBltScreenCapture.cs b/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/BitBltScreenCapture.cs
new file mode 100644
index 000000000..d8f1e214c
--- /dev/null
+++ b/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/BitBltScreenCapture.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Tango.RemoteDesktop.CaptureMethods
+{
+    /// <summary>
+    /// Represents a BitBlt screen capture method.
+    /// </summary>
+    /// <seealso cref="Tango.RemoteDesktop.ICaptureMethod" />
+    public class BitBltScreenCapture : ICaptureMethod
+    {
+        #region Win32 API Screen shot calls
+
+        // Win32 API calls necessary to support screen capture
+        [DllImport("gdi32", EntryPoint = "BitBlt", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
+        private static extern int BitBlt(int hDestDC, int x, int y, int nWidth, int nHeight, int hSrcDC, int xSrc,
+                                         int ySrc, int dwRop);
+
+        [DllImport("user32", EntryPoint = "GetDC", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
+        private static extern int GetDC(int hwnd);
+
+        [DllImport("user32", EntryPoint = "ReleaseDC", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
+        private static extern int ReleaseDC(int hwnd, int hdc);
+
+        #endregion
+
+        /// <summary>
+        /// Gets the desktop bitmap.
+        /// </summary>
+        /// <param name="region">The capture region.</param>
+        /// <returns></returns>
+        public Bitmap GetDesktopBitmap(CaptureRegion region)
+        {
+            const int SRCCOPY = 13369376;
+
+            Bitmap bitmap = new Bitmap(region.Width, region.Height);
+
+            using (Graphics g = Graphics.FromImage(bitmap))
+            {
+                // Get a device context to the windows desktop and our destination  bitmaps
+                int hdcSrc = GetDC(0);
+                IntPtr hdcDest = g.GetHdc();
+
+                // Copy what is on the desktop to the bitmap
+                BitBlt(hdcDest.ToInt32(), 0, 0, region.Width, region.Height, hdcSrc, 0, 0, SRCCOPY);
+
+                // Release device contexts
+                g.ReleaseHdc(hdcDest);
+                ReleaseDC(0, hdcSrc);
+            }
+
+            return bitmap;
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        public void Dispose()
+        {
+            //Do nothing.
+        }
+    }
+}
diff --git a/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/DirectXScreenCapture.cs b/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/DirectXScreenCapture.cs
new file mode 100644
index 000000000..1a661b27e
--- /dev/null
+++ b/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/DirectXScreenCapture.cs
@@ -0,0 +1,161 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SharpDX;
+using SharpDX.Direct3D11;
+using SharpDX.DXGI;
+using Tango.RemoteDesktop.Utils;
+using Device = SharpDX.Direct3D11.Device;
+using MapFlags = SharpDX.Direct3D11.MapFlags;
+
+namespace Tango.RemoteDesktop.CaptureMethods
+{
+    /// <summary>
+    /// Represents a high performance DirectX screen capture method.
+    /// </summary>
+    /// <seealso cref="Tango.RemoteDesktop.ICaptureMethod" />
+    public class DirectXScreenCapture : ICaptureMethod
+    {
+        private static bool _hasInstance;
+        private Device device;
+        private Output1 output1;
+        private Texture2DDescription textureDesc;
+        private OutputDuplication duplicatedOutput;
+        private int monitorWidth;
+        private int monitorHeight;
+
+        /// <summary>
+        /// Gets or sets the index of the graphics adapter.
+        /// </summary>
+        public int AdapterIndex { get; set; }
+
+        /// <summary>
+        /// Gets or sets the index of the monitor within the graphics adapter.
+        /// </summary>
+        public int MonitorIndex { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DirectXScreenCapture"/> class.
+        /// </summary>
+        /// <exception cref="InvalidOperationException">An instance of the DirectX screen capture method already exists. Please dispose it before attempting to create a new one.</exception>
+        public DirectXScreenCapture()
+        {
+            if (_hasInstance)
+            {
+                throw new InvalidOperationException("An instance of the DirectX screen capture method already exists. Please dispose it before attempting to create a new one.");
+            }
+
+            // Create DXGI Factory1
+            var factory = new Factory1();
+            var adapter = factory.GetAdapter1(AdapterIndex);
+
+            // Create device from Adapter
+            device = new Device(adapter);
+
+            // Get DXGI.Output
+            var output = adapter.GetOutput(MonitorIndex);
+            output1 = output.QueryInterface<Output1>();
+
+            // Width/Height of desktop to capture
+            monitorWidth = ((SharpDX.Rectangle)output.Description.DesktopBounds).Width;
+            monitorHeight = ((SharpDX.Rectangle)output.Description.DesktopBounds).Height;
+
+            // Create Staging texture CPU-accessible
+            textureDesc = new Texture2DDescription
+            {
+                CpuAccessFlags = CpuAccessFlags.Read,
+                BindFlags = BindFlags.None,
+                Format = Format.B8G8R8A8_UNorm,
+                Width = monitorWidth,
+                Height = monitorHeight,
+                OptionFlags = ResourceOptionFlags.None,
+                MipLevels = 1,
+                ArraySize = 1,
+                SampleDescription = { Count = 1, Quality = 0 },
+                Usage = ResourceUsage.Staging
+            };
+
+            // Duplicate the output
+            duplicatedOutput = output1.DuplicateOutput(device);
+
+            _hasInstance = true;
+        }
+
+        /// <summary>
+        /// Gets the desktop bitmap.
+        /// </summary>
+        /// <param name="region">The capture region.</param>
+        /// <returns></returns>
+        public virtual Bitmap GetDesktopBitmap(CaptureRegion region)
+        {
+            var screenTexture = new Texture2D(device, textureDesc);
+
+            SharpDX.DXGI.Resource screenResource;
+            OutputDuplicateFrameInformation duplicateFrameInformation;
+
+            // Try to get duplicated frame within given time
+            duplicatedOutput.AcquireNextFrame(10000, out duplicateFrameInformation, out screenResource);
+
+            // copy resource into memory that can be accessed by the CPU
+            using (var screenTexture2D = screenResource.QueryInterface<Texture2D>())
+                device.ImmediateContext.CopyResource(screenTexture2D, screenTexture);
+
+            // Get the desktop capture texture
+            var mapSource = device.ImmediateContext.MapSubresource(screenTexture, 0, MapMode.Read, MapFlags.None);
+
+            // Create Drawing.Bitmap
+            var bitmap = new Bitmap(monitorWidth, monitorHeight, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
+            var boundsRect = new System.Drawing.Rectangle(0, 0, monitorWidth, monitorHeight);
+
+            // Copy pixels from screen capture Texture to GDI bitmap
+            var mapDest = bitmap.LockBits(boundsRect, System.Drawing.Imaging.ImageLockMode.WriteOnly, bitmap.PixelFormat);
+            var sourcePtr = mapSource.DataPointer;
+            var destPtr = mapDest.Scan0;
+            for (int y = 0; y < region.Height; y++)
+            {
+                // Copy a single line 
+                Utilities.CopyMemory(destPtr, sourcePtr, monitorWidth * 4);
+
+                // Advance pointers
+                sourcePtr = IntPtr.Add(sourcePtr, mapSource.RowPitch);
+                destPtr = IntPtr.Add(destPtr, mapDest.Stride);
+            }
+
+            // Release source and dest locks
+            bitmap.UnlockBits(mapDest);
+            device.ImmediateContext.UnmapSubresource(screenTexture, 0);
+
+            if (region.Left > 0 || region.Top > 0 || region.Width < monitorWidth || region.Height < monitorHeight)
+            {
+                var cropped = CropImage(bitmap, new System.Drawing.Rectangle(region.Left, region.Top, region.Width, region.Height));
+                bitmap.Dispose();
+                bitmap = cropped;
+            }
+
+            screenTexture.Dispose();
+            screenResource.Dispose();
+            duplicatedOutput.ReleaseFrame();
+
+            return bitmap;
+        }
+
+        private Bitmap CropImage(Bitmap img, System.Drawing.Rectangle cropArea)
+        {
+            Bitmap bmpImage = new Bitmap(img);
+            return bmpImage.Clone(cropArea, bmpImage.PixelFormat);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        public void Dispose()
+        {
+            _hasInstance = false;
+            duplicatedOutput.Dispose();
+            device.Dispose();
+        }
+    }
+}
diff --git a/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/GdiScreenCapture.cs b/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/GdiScreenCapture.cs
new file mode 100644
index 000000000..92f4403fd
--- /dev/null
+++ b/Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/GdiScreenCapture.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Tango.RemoteDesktop.CaptureMethods
+{
+    /// <summary>
+    /// Represents a standard GDI screen capture method.
+    /// </summary>
+    /// <seealso cref="Tango.RemoteDesktop.ICaptureMethod" />
+    public class GdiScreenCapture : ICaptureMethod
+    {
+        /// <summary>
+        /// Gets the desktop bitmap.
+        /// </summary>
+        /// <param name="region">The capture region.</param>
+        /// <returns></returns>
+        public Bitmap GetDesktopBitmap(CaptureRegion region)
+        {
+            var bitmap = new Bitmap(region.Width, region.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
+
+            using (Graphics g = Graphics.FromImage(bitmap))
+            {
+                g.CopyFromScreen(region.Left, region.Top, 0, 0, bitmap.Size, System.Drawing.CopyPixelOperation.SourceCopy);
+            }
+
+            return bitmap;
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        public void Dispose()
+        {
+            //Do nothing
+        }
+    }
+}