Hola, he encontrado esta referencia de cómo hacerlo, pero necesitas conocimientos de programación C# para aplicarla. Permite usar una imagen (bitmap) de cualquier tamaño pasándosela al método SetCursor o redimensionar el cursor por defecto por ejemplo llamando a la clase como SystemCursors.SetSystemCursorsSize(64); generaría que el cursor tuviera tamaño 64 px:
using System;
using System.Drawing;
using System.Reflection;
using System.Runtime.InteropServices;
namespace WindowsFormsApplication1
{
class SystemCursors
{
[DllImport("user32.dll")]
static extern bool SetSystemCursor(IntPtr hcur, uint id);
enum CursorShift
{
Centered,
LowerRight,
}
public static void SetSystemCursorsSize(int newSize)
{
ResizeCursor(System.Windows.Forms.Cursors.AppStarting, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.Arrow, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.Cross, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.Hand, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.Help, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.HSplit, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.IBeam, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.No, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.NoMove2D, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.NoMoveHoriz, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.NoMoveVert, newSize, CursorShift.LowerRight);
ResizeCursor(System.Windows.Forms.Cursors.PanEast, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.PanNE, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.PanNorth, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.PanNW, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.PanSE, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.PanSouth, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.PanSW, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.PanWest, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.SizeAll, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.SizeNESW, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.SizeNS, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.SizeNWSE, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.SizeWE, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.UpArrow, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.VSplit, newSize, CursorShift.Centered);
ResizeCursor(System.Windows.Forms.Cursors.WaitCursor, newSize, CursorShift.LowerRight);
}
private static void ResizeCursor(System.Windows.Forms.Cursor cursor,
int newSize, CursorShift cursorShift)
{
Bitmap cursorImage = GetSystemCursorBitmap(cursor);
cursorImage = ResizeCursorBitmap(cursorImage, new Size(newSize, newSize), cursorShift);
SetCursor(cursorImage, getResourceId(cursor));
}
public static Bitmap GetSystemCursorBitmap(System.Windows.Forms.Cursor cursor)
{
Bitmap bitmap = new Bitmap(
cursor.Size.Width, cursor.Size.Height,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
Graphics graphics = Graphics.FromImage(bitmap);
cursor.Draw(graphics,
new Rectangle(new Point(0, 0), cursor.Size));
bitmap = Crop(bitmap);
return bitmap;
}
private static Bitmap Crop(Bitmap bmp)
{
//code from http://stackoverflow.com/a/10392379/935052
int w = bmp.Width;
int h = bmp.Height;
Func<int, bool> allWhiteRow = row =>
{
for (int i = 0; i < w; ++i)
if (bmp.GetPixel(i, row).A != 0)
return false;
return true;
};
Func<int, bool> allWhiteColumn = col =>
{
for (int i = 0; i < h; ++i)
if (bmp.GetPixel(col, i).A != 0)
return false;
return true;
};
int topmost = 0;
for (int row = 0; row < h; ++row)
{
if (allWhiteRow(row))
topmost = row;
else break;
}
int bottommost = 0;
for (int row = h - 1; row >= 0; --row)
{
if (allWhiteRow(row))
bottommost = row;
else break;
}
int leftmost = 0, rightmost = 0;
for (int col = 0; col < w; ++col)
{
if (allWhiteColumn(col))
leftmost = col;
else
break;
}
for (int col = w - 1; col >= 0; --col)
{
if (allWhiteColumn(col))
rightmost = col;
else
break;
}
if (rightmost == 0) rightmost = w; // As reached left
if (bottommost == 0) bottommost = h; // As reached top.
int croppedWidth = rightmost - leftmost;
int croppedHeight = bottommost - topmost;
if (croppedWidth == 0) // No border on left or right
{
leftmost = 0;
croppedWidth = w;
}
if (croppedHeight == 0) // No border on top or bottom
{
topmost = 0;
croppedHeight = h;
}
try
{
var target = new Bitmap(croppedWidth, croppedHeight);
using (Graphics g = Graphics.FromImage(target))
{
g.DrawImage(bmp,
new RectangleF(0, 0, croppedWidth, croppedHeight),
new RectangleF(leftmost, topmost, croppedWidth, croppedHeight),
GraphicsUnit.Pixel);
}
return target;
}
catch (Exception ex)
{
throw new Exception(
string.Format("Values are topmost={0} btm={1} left={2} right={3} croppedWidth={4} croppedHeight={5}", topmost, bottommost, leftmost, rightmost, croppedWidth, croppedHeight),
ex);
}
}
private static Bitmap ResizeCursorBitmap(Bitmap bitmap, Size size, CursorShift cursorShift)
{
if (size.Width > 32)
{
//shifting must occur
Bitmap intermediateBitmap = new Bitmap(64, 64);
Graphics intermediateGraphics = Graphics.FromImage(intermediateBitmap);
if (cursorShift == CursorShift.LowerRight)
//place the mouse cursor in the lower right hand quadrant of the bitmap
intermediateGraphics.DrawImage(bitmap,
intermediateBitmap.Width / 2, intermediateBitmap.Height / 2);
else if (cursorShift == CursorShift.Centered)
intermediateGraphics.DrawImage(bitmap,
intermediateBitmap.Width / 2 - bitmap.Width / 2,
intermediateBitmap.Height / 2 - bitmap.Height / 2);
//now we have a shifted bitmap; use it to draw the resized cursor
//Bitmap finalBitmap = new Bitmap(intermediateBitmap, size); //normal quality
Bitmap finalBitmap = new Bitmap(size.Width, size.Height);
Graphics finalGraphics = Graphics.FromImage(finalBitmap);
finalGraphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
finalGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
finalGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
finalGraphics.DrawImage(intermediateBitmap, 0, 0, finalBitmap.Width, finalBitmap.Height);
return finalBitmap;
}
else
{
Bitmap newBitmap = new Bitmap(bitmap, size);
return newBitmap;
}
}
private static uint getResourceId(System.Windows.Forms.Cursor cursor)
{
FieldInfo fi = typeof(System.Windows.Forms.Cursor).GetField(
"resourceId", BindingFlags.NonPublic | BindingFlags.Instance);
object obj = fi.GetValue(cursor);
return Convert.ToUInt32((int)obj);
}
private static void SetCursor(Bitmap bitmap, uint whichCursor)
{
IntPtr ptr = bitmap.GetHicon();
bool retval = SetSystemCursor(ptr, whichCursor);
}
}
}