bool TryAddFrame(CGImageDestination dest, int frame)
{
try
{
var corrupted = imageSource != null && imageSource.GetPropertiesSafe(frame) == null;
if (frame != currentFrame && imageSource != null && !corrupted)
{
InitializeImageFrame(frame);
}
if (!corrupted)
{
dest.AddImage(NativeCGImage, (NSDictionary)null);
}
return(true);
}
catch (Exception e)
{
Debug.Assert(false, "Failed adding destination: " + e.ToString());
return(false);
}
}
private void Save(CGImageDestination dest)
{
if (NativeCGImage == null)
{
throw new ObjectDisposedException("cgimage");
}
int framesSaved = 0;
int savedFrame = currentFrame;
for (int frame = 0; frame < frameCount; frame++)
{
var corrupted = imageSource != null && imageSource.GetPropertiesSafe(frame) == null;
if (frame != currentFrame && imageSource != null && !corrupted)
{
InitializeImageFrame(frame);
}
if (!corrupted)
{
dest.AddImage(NativeCGImage, (NSDictionary)null);
++framesSaved;
}
}
if (currentFrame != savedFrame)
{
InitializeImageFrame(savedFrame);
}
if (framesSaved == 0)
{
throw new ArgumentException("no frame could be saved");
}
dest.Close();
}