public static IntPtr CreatePackedDIBV5(Bitmap bm)
{
BitmapData bmData = bm.LockBits(new Rectangle(0, 0, bm.Width, bm.Height),
ImageLockMode.ReadOnly, bm.PixelFormat);
uint bufferLen = (uint)(Marshal.SizeOf(typeof(BITMAPV5HEADER)) +
(Marshal.SizeOf(typeof(uint)) * 3) + bmData.Height * bmData.Stride);
IntPtr hMem = GlobalAlloc(GHND | GMEM_DDESHARE, bufferLen);
IntPtr packedDIBV5 = GlobalLock(hMem);
BITMAPV5HEADER bmi = (BITMAPV5HEADER)Marshal.PtrToStructure(packedDIBV5,
typeof(BITMAPV5HEADER));
bmi.bV5Size = (uint)Marshal.SizeOf(typeof(BITMAPV5HEADER));
bmi.bV5Width = bmData.Width;
bmi.bV5Height = bmData.Height;
bmi.bV5BitCount = 32;
bmi.bV5Planes = 1;
bmi.bV5Compression = BI_BITFIELDS;
bmi.bV5XPelsPerMeter = 0;
bmi.bV5YPelsPerMeter = 0;
bmi.bV5ClrUsed = 0;
bmi.bV5ClrImportant = 0;
bmi.bV5BlueMask = 0x000000FF;
bmi.bV5GreenMask = 0x0000FF00;
bmi.bV5RedMask = 0x00FF0000;
bmi.bV5AlphaMask = 0xFF000000;
bmi.bV5CSType = LCS_WINDOWS_COLOR_SPACE;
bmi.bV5GammaBlue = 0;
bmi.bV5GammaGreen = 0;
bmi.bV5GammaRed = 0;
bmi.bV5ProfileData = 0;
bmi.bV5ProfileSize = 0;
bmi.bV5Reserved = 0;
bmi.bV5Intent = LCS_GM_IMAGES;
bmi.bV5SizeImage = (uint)(bmData.Height * bmData.Stride);
bmi.bV5Endpoints.ciexyzBlue.ciexyzX =
bmi.bV5Endpoints.ciexyzBlue.ciexyzY =
bmi.bV5Endpoints.ciexyzBlue.ciexyzZ = 0;
bmi.bV5Endpoints.ciexyzGreen.ciexyzX =
bmi.bV5Endpoints.ciexyzGreen.ciexyzY =
bmi.bV5Endpoints.ciexyzGreen.ciexyzZ = 0;
bmi.bV5Endpoints.ciexyzRed.ciexyzX =
bmi.bV5Endpoints.ciexyzRed.ciexyzY =
bmi.bV5Endpoints.ciexyzRed.ciexyzZ = 0;
Marshal.StructureToPtr(bmi, packedDIBV5, false);
BITFIELDS Masks = (BITFIELDS)Marshal.PtrToStructure(
(IntPtr)(packedDIBV5.ToInt32() + bmi.bV5Size), typeof(BITFIELDS));
Masks.BlueMask = 0x000000FF;
Masks.GreenMask = 0x0000FF00;
Masks.RedMask = 0x00FF0000;
Marshal.StructureToPtr(Masks, (IntPtr)(packedDIBV5.ToInt32() +
bmi.bV5Size), false);
long offsetBits = bmi.bV5Size + Marshal.SizeOf(typeof(uint)) * 3;
IntPtr bits = (IntPtr)(packedDIBV5.ToInt32() + offsetBits);
for (int y = 0; y < bmData.Height; y++)
{
IntPtr DstDib = (IntPtr)(bits.ToInt32() + (y * bmData.Stride));
IntPtr SrcDib = (IntPtr)(bmData.Scan0.ToInt32() + ((bmData.Height - 1 - y) *
bmData.Stride));
for (int x = 0; x < bmData.Width; x++)
{
Marshal.WriteInt32(DstDib, Marshal.ReadInt32(SrcDib));
DstDib = (IntPtr)(DstDib.ToInt32() + 4);
SrcDib = (IntPtr)(SrcDib.ToInt32() + 4);
}
}
// Create the DIB section with an alpha channel.
IntPtr hdc = User32.GetDC(IntPtr.Zero);
//IntPtr hdc = Gdi32.CreateCompatibleDC(IntPtr.Zero);
GCHandle handle = GCHandle.Alloc(bmi, GCHandleType.Pinned);
/*IntPtr hBitmap = Gdi32.CreateDIBSection(hdc, handle.AddrOfPinnedObject(), (uint)SharpThumbnailHandler.DIB.DIB_RGB_COLORS,
* out bits, IntPtr.Zero, 0);*/
IntPtr hBitmap = Gdi32.CreateDIBitmap(hdc, handle.AddrOfPinnedObject(), CBM_INIT,
bits, handle.AddrOfPinnedObject(), (uint)DIB.DIB_RGB_COLORS);
bm.UnlockBits(bmData);
GlobalUnlock(hMem);
return(hBitmap);
}