ShareX/ShareX.HelpersLib/CursorData.cs

#region License Information (GPL v3)

/*
    ShareX - A program that allows you to take screenshots and share any file type
    Copyright (c) 2007-2022 ShareX Team

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
*/

#endregion License Information (GPL v3)

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

namespace ShareX.HelpersLib
{
    public class CursorData
    {
        public IntPtr Handle { get; private set; }
        public Point Position { get; private set; }
        public Point Hotspot { get; private set; }
        public Point DrawPosition => new Point(Position.X - Hotspot.X, Position.Y - Hotspot.Y);
        public Size BaseSize { get; private set; }
        public bool IsVisible { get; private set; }

        public CursorData()
        {
            UpdateCursorData();
        }

        public void UpdateCursorData()
        {
            Handle = IntPtr.Zero;
            Position = Point.Empty;
            IsVisible = false;

            CursorInfo cursorInfo = new CursorInfo();
            cursorInfo.cbSize = Marshal.SizeOf(cursorInfo);

            if (NativeMethods.GetCursorInfo(out cursorInfo))
            {
                Handle = cursorInfo.hCursor;
                Position = cursorInfo.ptScreenPos;
                BaseSize = GetCursorBaseSize();
                IsVisible = cursorInfo.flags == NativeConstants.CURSOR_SHOWING;

                if (IsVisible)
                {
                    IntPtr iconHandle = NativeMethods.CopyIcon(Handle);

                    if (iconHandle != IntPtr.Zero)
                    {
                        if (NativeMethods.GetIconInfo(iconHandle, out IconInfo iconInfo))
                        {
                            if (BaseSize.IsEmpty)
                            {
                                Hotspot = new Point(iconInfo.xHotspot, iconInfo.yHotspot);
                            }
                            else
                            {
                                float multiplier = BaseSize.Width / 32f;
                                Hotspot = new Point((int)Math.Round(iconInfo.xHotspot * multiplier), (int)Math.Round(iconInfo.yHotspot * multiplier));
                            }

                            if (iconInfo.hbmMask != IntPtr.Zero)
                            {
                                NativeMethods.DeleteObject(iconInfo.hbmMask);
                            }

                            if (iconInfo.hbmColor != IntPtr.Zero)
                            {
                                NativeMethods.DeleteObject(iconInfo.hbmColor);
                            }
                        }

                        NativeMethods.DestroyIcon(iconHandle);
                    }
                }
            }
        }

        public static Size GetCursorBaseSize()
        {
            try
            {
                int cursorBaseSize = RegistryHelpers.GetValueDWord(@"Control Panel\Cursors", "CursorBaseSize");
                return new Size(cursorBaseSize, cursorBaseSize);
            }
            catch
            {
                return Size.Empty;
            }
        }

        public void DrawCursor(IntPtr hdcDest)
        {
            DrawCursor(hdcDest, Point.Empty);
        }

        public void DrawCursor(IntPtr hdcDest, Point offset)
        {
            if (IsVisible)
            {
                Point drawPosition = new Point(DrawPosition.X - offset.X, DrawPosition.Y - offset.Y);
                drawPosition = CaptureHelpers.ScreenToClient(drawPosition);

                NativeMethods.DrawIconEx(hdcDest, drawPosition.X, drawPosition.Y, Handle, BaseSize.Width, BaseSize.Height, 0, IntPtr.Zero, NativeConstants.DI_NORMAL);
            }
        }

        public void DrawCursor(Image img)
        {
            DrawCursor(img, Point.Empty);
        }

        public void DrawCursor(Image img, Point offset)
        {
            if (IsVisible)
            {
                using (Graphics g = Graphics.FromImage(img))
                {
                    IntPtr hdcDest = g.GetHdc();

                    DrawCursor(hdcDest, offset);

                    g.ReleaseHdc(hdcDest);
                }
            }
        }

        public Bitmap ToBitmap()
        {
            Size cursorSize;

            if (BaseSize.IsEmpty)
            {
                cursorSize = new Size(32, 32);
            }
            else
            {
                cursorSize = BaseSize;
            }

            Bitmap bmp = new Bitmap(cursorSize.Width, cursorSize.Height);

            using (Graphics g = Graphics.FromImage(bmp))
            {
                IntPtr hdcDest = g.GetHdc();

                NativeMethods.DrawIconEx(hdcDest, 0, 0, Handle, cursorSize.Width, cursorSize.Height, 0, IntPtr.Zero, NativeConstants.DI_NORMAL);

                g.ReleaseHdc(hdcDest);
            }

            return bmp;
        }
    }
}