Create a semi-transparent cursor from an image

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深忆病人
深忆病人 2021-02-14 23:12

Is it possible to create a cursor from an image and have it be semi-transparent?

I\'m currently taking a custom image and overylaying the mouse cursor image. It would b

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  • 2021-02-14 23:59

    I've tried following example, and it was working fine...

        public struct IconInfo
        {
            public bool fIcon;
            public int xHotspot;
            public int yHotspot;
            public IntPtr hbmMask;
            public IntPtr hbmColor;
        }
    
    
        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);
    
        [DllImport("user32.dll")]
        public static extern IntPtr CreateIconIndirect(ref IconInfo icon);
    
        public static Cursor CreateCursor(Bitmap bmp, int xHotSpot, int yHotSpot)
        {
            IntPtr ptr = bmp.GetHicon();
            IconInfo tmp = new IconInfo();
            GetIconInfo(ptr, ref tmp);
            tmp.xHotspot = xHotSpot;
            tmp.yHotspot = yHotSpot;
            tmp.fIcon = false;
            ptr = CreateIconIndirect(ref tmp);
            return new Cursor(ptr);
        }
    

    And i've put this on button click event (you can call from where you like):

    Bitmap b = new Bitmap("D:/Up.png");
    this.Cursor = CreateCursor(b, 5, 5);
    

    And the Up.png image is saved with 75% opacity in AdobePhotoshop.

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  • 2021-02-14 23:59

    On the top of my head (I would try that first):

    1. create new bitmap with same size as original, but with ARGB structure
    2. drawimage: existing bitmap to the new bitmap
    3. access raw bitmap data, and replace A bytes with 128

    You should have nice semitransparent bitmap there.

    If performance allows, you can scan for fully transparent pixels and set A to zero for them!

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  • 2021-02-15 00:10

    that is very easy, I don't use API.

    the code is

      Bitmap img = new Bitmap(new Bitmap(@"image.png"), 30, 30); //this is the size of cursor
    
      Icon icono = Icon.FromHandle(img.GetHicon()); //create the Icon object 
    
      Cursor = new Cursor(icono.Handle); //the icon Object has the stream to create a Cursor.
    

    I hope that is your solution

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  • 2021-02-15 00:16

    If you want to set transparency of a custom mouse cursor bitmap 'on the fly' you may find this function helpful. It uses a color matrix to set the amount of transparency to any given bitmap and will return the modified one. To have just a touch of transparency the TranspFactor should be between 225 and 245, just try it out. (You need to import System.Drawing and System.Drawing.Imaging)

    public static Bitmap GetBMPTransparent(Bitmap bmp, int TranspFactor)
    

    {

    Bitmap transpBmp = new Bitmap(bmp.Width, bmp.Height);
    using (ImageAttributes attr = new ImageAttributes()) {
        ColorMatrix matrix = new ColorMatrix { Matrix33 = Convert.ToSingle(TranspFactor / 255) };
        attr.SetColorMatrix(matrix);
        using (Graphics g = Graphics.FromImage(transpBmp)) {
            g.DrawImage(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, bmp.Width, bmp.Height, GraphicsUnit.Pixel, attr);
        }
    }
    return transpBmp;
    

    }

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