///<summary>Returns a Png Bitmap from the currently loaded ShellStyle.dll</summary>
public Bitmap GetResourcePNG(string resourceName)
{
// the resource size includes some header information
const int FILE_HEADER_BYTES = 40;
Bitmap tmpNoAlpha = Bitmap.FromResource(hModule, "#" + resourceName);
IntPtr hResource = this["#" + resourceName, (IntPtr)RC_ENUM.RT_BITMAP];
int resourceSize = SizeofResource(hModule, hResource);
Bitmap bitmap = new Bitmap(tmpNoAlpha.Width, tmpNoAlpha.Height, PixelFormat.Format32bppArgb);
IntPtr hLoadedResource = LoadResource(hModule, hResource);
byte[] bitmapBytes = new byte[resourceSize];
GCHandle gcHandle = GCHandle.Alloc(bitmapBytes, GCHandleType.Pinned);
IntPtr firstCopyElement = Marshal.UnsafeAddrOfPinnedArrayElement(bitmapBytes, 0);
CopyMemory(firstCopyElement, hLoadedResource, resourceSize);
FreeResource(hLoadedResource);
Rectangle copyArea = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
BitmapData alphaBits = bitmap.LockBits(
copyArea,
ImageLockMode.WriteOnly,
PixelFormat.Format32bppArgb
);
firstCopyElement =
Marshal.UnsafeAddrOfPinnedArrayElement(
bitmapBytes,
FILE_HEADER_BYTES
);
CopyMemory(
alphaBits.Scan0,
firstCopyElement,
resourceSize - FILE_HEADER_BYTES
);
gcHandle.Free();
bitmap.UnlockBits(alphaBits);
Gdi32.GdiFlush();
// flip bits (not sure why this is needed at the moment..)
bitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);
return(bitmap);
}