internal static GifPropertyItem[] ConvertFromMemory(IntPtr propdata, int count)
{
var props = new GifPropertyItem[count];
for (var i = 0; i < count; i++)
{
GifPropertyItemInternal propcopy = null;
try
{
propcopy = (GifPropertyItemInternal)ExternDllHelper.PtrToStructure(propdata,
typeof(GifPropertyItemInternal));
props[i] = new GifPropertyItem
{
Id = propcopy.id,
Len = propcopy.len,
Type = propcopy.type,
Value = propcopy.Value
};
// this calls Marshal.Copy and creates a copy of the original memory into a byte array.
propcopy.value = IntPtr.Zero; // we dont actually own this memory so dont free it.
}
finally
{
propcopy?.Dispose();
}
propdata = (IntPtr)((long)propdata + Marshal.SizeOf(typeof(GifPropertyItemInternal)));
}
return(props);
}
private void GetBitmapSource()
{
var handle = IntPtr.Zero;
try
{
handle = GetHbitmap();
Source = Imaging.CreateBitmapSourceFromHBitmap(handle, IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
}
catch
{
// ignored
}
finally
{
if (handle != IntPtr.Zero)
{
ExternDllHelper.DeleteObject(handle);
}
}
}