From 0dcd742a3c35527386a93e1b1ef761c2aeff8308 Mon Sep 17 00:00:00 2001
From: Roy Ben Shabat <Roy.mail.net@gmail.com>
Date: Mon, 2 Mar 2020 23:30:34 +0200
Subject: Implemented Tango.RemoteDesktop. Implemented png 8 bit quantization.
 Implemented RasterFrame bounds clipping. Refactored VectorFrame to use
 indexed colors.

---
 .../CaptureMethods/BitBltScreenCapture.cs          | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/BitBltScreenCapture.cs

(limited to 'Software/Visual_Studio/Tango.RemoteDesktop/CaptureMethods/BitBltScreenCapture.cs')

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.
+        }
+    }
+}
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