public static void Colourize (NSView control, Color color, Action drawAction)
{
var size = control.Frame.Size;
var image = new NSImage (size);
image.LockFocusFlipped (control.IsFlipped);
drawAction ();
image.UnlockFocus ();
var ciImage = CIImage.FromData (image.AsTiff ());
if (control.IsFlipped) {
var realSize = control.ConvertSizeToBase (size);
var affineTransform = new NSAffineTransform ();
affineTransform.Translate (0, realSize.Height);
affineTransform.Scale (1, -1);
var filter1 = CIFilter.FromName ("CIAffineTransform");
filter1.SetValueForKey (ciImage, CIInputImage);
filter1.SetValueForKey (affineTransform, CIInputTransform);
ciImage = filter1.ValueForKey (CIOutputImage) as CIImage;
}
var filter2 = CIFilter.FromName ("CIColorControls");
filter2.SetDefaults ();
filter2.SetValueForKey (ciImage, CIInputImage);
filter2.SetValueForKey (new NSNumber (0.0f), CIInputSaturation);
ciImage = filter2.ValueForKey (CIOutputImage) as CIImage;
var filter3 = CIFilter.FromName ("CIColorMatrix");
filter3.SetDefaults ();
filter3.SetValueForKey (ciImage, CIInputImage);
filter3.SetValueForKey (new CIVector (0, color.R, 0), CIInputRVector);
filter3.SetValueForKey (new CIVector (color.G, 0, 0), CIInputGVector);
filter3.SetValueForKey (new CIVector (0, 0, color.B), CIInputBVector);
ciImage = filter3.ValueForKey (CIOutputImage) as CIImage;
image = new NSImage (size);
var rep = NSCIImageRep.FromCIImage (ciImage);
image.AddRepresentation (rep);
image.Draw (SD.PointF.Empty, new SD.RectangleF (SD.PointF.Empty, size), NSCompositingOperation.SourceOver, 1);
/* Use this when implemented in maccore:
ciImage.Draw (SD.PointF.Empty, new SD.RectangleF (SD.PointF.Empty, size), NSCompositingOperation.SourceOver, 1);
*/
}
NSImage MakeRotatedCopy (NSImage original, float degrees)
{
var copy = new NSImage (original.Size);
copy.LockFocus ();
try {
var rot = new NSAffineTransform ();
rot.Translate (original.Size.Width / 2, original.Size.Height / 2);
rot.RotateByDegrees (degrees);
rot.Translate (-original.Size.Width / 2, -original.Size.Height / 2);
rot.Concat ();
original.Draw (PointF.Empty, RectangleF.Empty, NSCompositingOperation.Copy, 1);
} finally {
copy.UnlockFocus ();
}
return copy;
}