Create a semi-transparent cursor from an image

Question

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 be great if I could make this semi-transparent, but not necessary. The sales guys love shiny.

Currently doing something like this:

Image cursorImage = customImage.GetThumbnailImage(300, 100, null, IntPtr.Zero); cursorImage.SetResolution(96.0F, 96.0F); int midPointX = cursorImage.Width / 2; int midPointY = cursorImage.Height / 2; Bitmap cursorMouse = GetCursorImage(cursorOverlay); Graphics cursorGfx = Graphics.FromImage(cursorImageCopy); cursorGfx.DrawImageUnscaled(cursorMouse, midPointX, midPointY); Cursor tmp = new Cursor(cursorImage.GetHicon());

alt text http://members.cox.net/dustinbrooks/drag.jpg

godly-devotion · Accepted Answer · 2012-05-17 02:58:56Z

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.

Daniel Mošmondor · Accepted Answer · 2009-09-04 21:39:35Z

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

create new bitmap with same size as original, but with ARGB structure
drawimage: existing bitmap to the new bitmap
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!

pewehh · Accepted Answer · 2016-08-09 13:56:08Z

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;

}

Gonzalo.- · Accepted Answer · 2012-09-21 18:10:47Z

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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