/// <devdoc>
/// Loads a picture from the requested stream.
/// </devdoc>
private void LoadPicture(UnsafeNativeMethods.IStream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
try {
Guid g = typeof(UnsafeNativeMethods.IPicture).GUID;
UnsafeNativeMethods.IPicture picture = null;
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
try {
picture = UnsafeNativeMethods.OleCreateIPictureIndirect(null, ref g, true);
UnsafeNativeMethods.IPersistStream ipictureAsIPersist = (UnsafeNativeMethods.IPersistStream)picture;
ipictureAsIPersist.Load(stream);
if (picture != null && picture.GetPictureType() == NativeMethods.Ole.PICTYPE_ICON)
{
IntPtr cursorHandle = picture.GetHandle();
Size picSize = GetIconSize(cursorHandle);
if (DpiHelper.IsScalingRequired)
{
picSize = DpiHelper.LogicalToDeviceUnits(picSize);
}
handle = SafeNativeMethods.CopyImageAsCursor(new HandleRef(this, cursorHandle), NativeMethods.IMAGE_CURSOR,
picSize.Width, picSize.Height, 0);
ownHandle = true;
}
else
{
throw new ArgumentException(string.Format(SR.InvalidPictureType,
"picture",
"Cursor"), "picture");
}
}
finally {
CodeAccessPermission.RevertAssert();
// destroy the picture...
if (picture != null)
{
Marshal.ReleaseComObject(picture);
}
}
}
catch (COMException e) {
Debug.Fail(e.ToString());
throw new ArgumentException(SR.InvalidPictureFormat, "stream", e);
}
}
// FIXME what's it doing here? There's probably a reason this was added here.
static public void RevertAssert()
{
CodeAccessPermission.RevertAssert();
}
// FIXME what's it doing here? There's probably a reason this was added here.
static public void RevertAssert()
{
#if !DISABLE_CAS_USE
CodeAccessPermission.RevertAssert();
#endif
}
