public void SetBitmap(Bitmap bitmap)
{
if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
{
throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");
}
var screenDc = Win32.GetDC(IntPtr.Zero);
var memDc = Win32.CreateCompatibleDC(screenDc);
var hBitmap = IntPtr.Zero;
var oldBitmap = IntPtr.Zero;
try
{
hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
oldBitmap = Win32.SelectObject(memDc, hBitmap);
var size = new Win32.Size(bitmap.Width, bitmap.Height);
var pointSource = new Win32.Point(0, 0);
var topPos = new Win32.Point(Left, Top);
var blend = new Win32.Blendfunction
{
BlendOp = Win32.AC_SRC_OVER,
BlendFlags = 0,
SourceConstantAlpha = 255,
AlphaFormat = Win32.AC_SRC_ALPHA
};
Win32.UpdateLayeredWindow(Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, Win32.ULW_ALPHA);
}
finally
{
Win32.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero)
{
Win32.SelectObject(memDc, oldBitmap);
Win32.DeleteObject(hBitmap);
}
Win32.DeleteDC(memDc);
timer1.Start();
}
}
public void SetBitmap(Bitmap bitmap)
{
if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");
var screenDc = Win32.GetDC(IntPtr.Zero);
var memDc = Win32.CreateCompatibleDC(screenDc);
var hBitmap = IntPtr.Zero;
var oldBitmap = IntPtr.Zero;
try
{
hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
oldBitmap = Win32.SelectObject(memDc, hBitmap);
var size = new Win32.Size(bitmap.Width, bitmap.Height);
var pointSource = new Win32.Point(0, 0);
var topPos = new Win32.Point(Left, Top);
var blend = new Win32.Blendfunction
{
BlendOp = Win32.AC_SRC_OVER,
BlendFlags = 0,
SourceConstantAlpha = 255,
AlphaFormat = Win32.AC_SRC_ALPHA
};
Win32.UpdateLayeredWindow(Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, Win32.ULW_ALPHA);
}
finally
{
Win32.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero)
{
Win32.SelectObject(memDc, oldBitmap);
Win32.DeleteObject(hBitmap);
}
Win32.DeleteDC(memDc);
timer1.Start();
}
}
