using Interop;

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.Runtime.InteropServices;

namespace Selenium.Internal {

class ImgExt {

public static IStdPicture ImageToPictureDisp(Bitmap bitmap) {

var pictDescBitmap = new NativeMethods.PictDescBitmap(bitmap);

object ppVoid = null;

Guid guid = typeof(IStdPicture).GUID;

NativeMethods.OleCreatePictureIndirect(pictDescBitmap, ref guid, true, out ppVoid);

return (IStdPicture)ppVoid;

}

public static Bitmap RemoveAlphaChannel(Bitmap bitmapSrc) {

Rectangle rect = new Rectangle(0, 0, bitmapSrc.Width, bitmapSrc.Height);

Bitmap bitmapDest = (Bitmap)new Bitmap(bitmapSrc.Width, bitmapSrc.Height, PixelFormat.Format24bppRgb);

BitmapData dataSrc = bitmapSrc.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);

BitmapData dataDest = bitmapDest.LockBits(rect, ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);

NativeMethods.CopyMemory(dataDest.Scan0, dataSrc.Scan0, (uint)dataSrc.Stride * (uint)dataSrc.Height);

bitmapSrc.UnlockBits(dataSrc);

bitmapDest.UnlockBits(dataDest);

return bitmapDest;

}

static class NativeMethods {

const string KERNEL32 = "Kernel32.dll";

const string OLEAUTH32 = "oleaut32.dll";

[DllImport(KERNEL32)]

public extern static void CopyMemory(IntPtr dest, IntPtr src, uint length);

[StructLayout(LayoutKind.Sequential)]

public class PictDescBitmap {

internal int cbSizeOfStruct = Marshal.SizeOf(typeof(PictDescBitmap));

internal int pictureType = 1;

internal IntPtr hBitmap = IntPtr.Zero;

internal IntPtr hPalette = IntPtr.Zero;

internal int unused = 0;

internal PictDescBitmap(Bitmap bitmap) {

this.hBitmap = bitmap.GetHbitmap();

}

}

[DllImport(OLEAUTH32, PreserveSig = true)]

public static extern int OleCreatePictureIndirect(

[In] PictDescBitmap pictdesc, ref Guid iid, bool fOwn,

[MarshalAs(UnmanagedType.Interface)] out object ppVoid);

}

}

}