/// <summary>
/// Sets the raw byte value of a Hid feature code.
/// </summary>
/// <param name="featureCode">The Hid feature code to set.</param>
/// <param name="value">The value to set.</param>
/// <returns></returns>
/// <remarks></remarks>
public bool HidSetFeature(byte featureCode, byte[] value)
{
bool HidSetFeatureRet = default;
var hfile = HidFeatures.OpenHid(this);
if (hfile == IntPtr.Zero)
{
return(false);
}
var mm = new MemPtr();
mm.Alloc(value.Length + 1);
mm.FromByteArray(value, 1L);
mm.ByteAt(0L) = featureCode;
if (!UsbLibHelpers.HidD_SetFeature(hfile, mm, (int)mm.Length))
{
HidSetFeatureRet = false;
}
else
{
HidSetFeatureRet = true;
}
mm.Free();
HidFeatures.CloseHid(hfile);
return(HidSetFeatureRet);
}
/// <summary>
/// Create a transparency mask from the transparent bits in an image.
/// </summary>
/// <param name="hBits">A pointer to the memory address of the bitmap bits.</param>
/// <param name="hMask">A pointer to the memory address of the mask bits.</param>
/// <param name="Width">The width of the image.</param>
/// <param name="Height">The height of the image.</param>
/// <remarks></remarks>
private void _setMask(MemPtr hBits, MemPtr hMask, int Width, int Height)
{
// this never changes
int numBits = 32;
int x;
int y;
byte bit;
int d;
int e;
int f;
double move = numBits / 8d;
int stride = (int)(Width * (numBits / 8d));
int msize = (int)(Math.Max(32, Width) * Height / 8d);
int isize = (int)(Width * Height * (numBits / 8d));
byte[] bb;
byte[] imgb;
imgb = new byte[isize];
bb = new byte[msize];
Marshal.Copy(hBits.Handle, imgb, 0, isize);
for (y = 0; y < Height; y++)
{
d = y * stride;
for (x = 0; x < Width; x++)
{
f = (int)(d + x * move);
e = (int)Math.Floor(x / 8d);
bit = (byte)(7 - x % 8);
if (imgb[f + 3] == 0)
{
bb[e] = (byte)(bb[e] | 1 << bit);
}
}
}
// MemCpy(hMask.Handle, bb, msize)
hMask.FromByteArray(bb, 0L);
}