public void SelectBitmap(Bitmap bitmap, int opacity)
{
// Does this bitmap contain an alpha channel?
if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
{
throw new ApplicationException("The bitmap must be 32bpp with alpha-channel.");
}
// Get device contexts
IntPtr screenDc = GetDC(IntPtr.Zero);
IntPtr memDc = CreateCompatibleDC(screenDc);
IntPtr hBitmap = IntPtr.Zero;
IntPtr hOldBitmap = IntPtr.Zero;
try
{
// Get handle to the new bitmap and select it into the current
// device context.
hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
hOldBitmap = SelectObject(memDc, hBitmap);
// Set parameters for layered window update.
PSize newSize = new PSize(bitmap.Width, bitmap.Height);
PPoint sourceLocation = new PPoint(0, 0);
PPoint newLocation = new PPoint(this.Left, this.Top);
BLENDFUNCTION blend = new BLENDFUNCTION();
blend.BlendOp = AC_SRC_OVER;
blend.BlendFlags = 0;
blend.SourceConstantAlpha = (byte)opacity;
blend.AlphaFormat = AC_SRC_ALPHA;
// Update the window.
UpdateLayeredWindow(
this.Handle, // Handle to the layered window
screenDc, // Handle to the screen DC
ref newLocation, // New screen position of the layered window
ref newSize, // New size of the layered window
memDc, // Handle to the layered window surface DC
ref sourceLocation, // Location of the layer in the DC
0, // Color key of the layered window
ref blend, // Transparency of the layered window
ULW_ALPHA // Use blend as the blend function
);
}
finally
{
// Release device context.
ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero)
{
SelectObject(memDc, hOldBitmap);
DeleteObject(hBitmap);
}
DeleteDC(memDc);
}
}
public override void Load()
{
Bind <IKernel>().ToConstant(this.Kernel).InSingletonScope().Named("GlobalKernel");
Bind <ContextManager>().ToSelf().InSingletonScope();
Bind <App>().ToSelf().InSingletonScope();
var sz = new PSize()
{
Width = 1080, Height = 1920
};
Bind <PSize>().ToConstant(sz).InTransientScope();
}
static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
ref PPoint pptDst, ref PSize psize, IntPtr hdcSrc, ref PPoint pprSrc,
Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);
protected void PopulateSize()
{
string[] size = { "Large", "Medium", "Small" };
PSize.DataSource = size;
PSize.DataBind();
}
