xenadmin/XenAdmin/VNC/GraphicsUtils.cs

/* Copyright (c) Cloud Software Group, Inc. 
 * 
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 * with or without modification, are permitted provided 
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 *     following disclaimer in the documentation and/or other 
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 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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 */

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace DotNetVnc
{
    public class GraphicsUtils
    {
        private static readonly log4net.ILog Log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        [DllImport("kernel32.dll")]
        private extern static short QueryPerformanceCounter(ref long x);
        [DllImport("kernel32.dll")]
        private extern static short QueryPerformanceFrequency(ref long x);

        private static long ctr1 = 0, ctr2 = 0, freq = 0;

        public static void startTime()
        {
            QueryPerformanceCounter(ref ctr1);
        }

        public static double endTime(String msg)
        {
            QueryPerformanceCounter(ref ctr2);
            QueryPerformanceFrequency(ref freq);
            double time = (ctr2 - ctr1) * 1.0 / freq;
            Log.Info(msg + " time: " + time + " seconds.");
            ctr1 = ctr2 = freq = 0;
            return time;
        }

        public static void copyRect(Bitmap src, int x, int y, int width, int height, Graphics dest, int dx, int dy)
        {
            IntPtr pTarget = dest.GetHdc();
            IntPtr pSource = CreateCompatibleDC(pTarget);
            IntPtr pOrig = SelectObject(pSource, src.GetHbitmap());
            BitBlt(pTarget, dx, dy, width, height, pSource, x, y, (uint)TernaryRasterOperations.SRCCOPY);
            IntPtr pNew = SelectObject(pSource, pOrig);
            DeleteObject(pNew);
            DeleteDC(pSource);
            dest.ReleaseHdc(pTarget);
        }

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern IntPtr CreateCompatibleDC(IntPtr hdc);

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern bool DeleteDC(IntPtr hdc);

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern bool DeleteObject(IntPtr hObject);

        /// <summary>
        ///    Performs a bit-block transfer of the color data corresponding to a
        ///    rectangle of pixels from the specified source device context into
        ///    a destination device context.
        /// </summary>
        /// <param name="hdc">Handle to the destination device context.</param>
        /// <param name="nXDest">The leftmost x-coordinate of the destination rectangle (in pixels).</param>
        /// <param name="nYDest">The topmost y-coordinate of the destination rectangle (in pixels).</param>
        /// <param name="nWidth">The width of the source and destination rectangles (in pixels).</param>
        /// <param name="nHeight">The height of the source and the destination rectangles (in pixels).</param>
        /// <param name="hdcSrc">Handle to the source device context.</param>
        /// <param name="nXSrc">The leftmost x-coordinate of the source rectangle (in pixels).</param>
        /// <param name="nYSrc">The topmost y-coordinate of the source rectangle (in pixels).</param>
        /// <param name="dwRop">A raster-operation code.</param>
        /// <returns>
        ///    <c>true</c> if the operation succeeded, <c>false</c> otherwise.
        /// </returns>
        [DllImport("gdi32.dll")]
        private static extern bool BitBlt(IntPtr hdc, int nXDest, int nYDest, int nWidth,
           int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, uint dwRop);

        /// <summary>
        ///     Specifies a raster-operation code. These codes define how the color data for the
        ///     source rectangle is to be combined with the color data for the destination
        ///     rectangle to achieve the final color.
        /// </summary>
        private enum TernaryRasterOperations : uint
        {
            /// <summary>dest = source</summary>
            SRCCOPY = 0x00CC0020,
            /// <summary>dest = source OR dest</summary>
            SRCPAINT = 0x00EE0086,
            /// <summary>dest = source AND dest</summary>
            SRCAND = 0x008800C6,
            /// <summary>dest = source XOR dest</summary>
            SRCINVERT = 0x00660046,
            /// <summary>dest = source AND (NOT dest)</summary>
            SRCERASE = 0x00440328,
            /// <summary>dest = (NOT source)</summary>
            NOTSRCCOPY = 0x00330008,
            /// <summary>dest = (NOT src) AND (NOT dest)</summary>
            NOTSRCERASE = 0x001100A6,
            /// <summary>dest = (source AND pattern)</summary>
            MERGECOPY = 0x00C000CA,
            /// <summary>dest = (NOT source) OR dest</summary>
            MERGEPAINT = 0x00BB0226,
            /// <summary>dest = pattern</summary>
            PATCOPY = 0x00F00021,
            /// <summary>dest = DPSnoo</summary>
            PATPAINT = 0x00FB0A09,
            /// <summary>dest = pattern XOR dest</summary>
            PATINVERT = 0x005A0049,
            /// <summary>dest = (NOT dest)</summary>
            DSTINVERT = 0x00550009,
            /// <summary>dest = BLACK</summary>
            BLACKNESS = 0x00000042,
            /// <summary>dest = WHITE</summary>
            WHITENESS = 0x00FF0062
        }

    }
}