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using System;
using AppKit;
using CoreGraphics;
using CoreImage;
using Xamarin.PropertyEditing.Drawing;
namespace Xamarin.PropertyEditing.Mac
{
public static class DrawingExtensions
{
public static NSImage CreateSwatch (this CommonColor color, CGSize size)
{
var c0 = CIColor.FromCGColor (color.Blend (CommonColor.White).ToCGColor ());
var c1 = CIColor.FromCGColor (color.Blend (CommonColor.Black).ToCGColor ());
return CreateSwatch (color, size, c0, c1);
}
public static NSImage CreateSwatch (this CommonColor color, CGSize size, CIColor c0, CIColor c1)
=> new NSImage (GenerateCheckerboard (new CGRect (0, 0, size.Width,size.Height), c0, c1), size);
public static CGImage GenerateCheckerboard (CGRect frame)
=> GenerateCheckerboard (frame, CIColor.WhiteColor, CIColor.BlackColor);
public static CGImage GenerateCheckerboard (CGRect frame, CIColor c0, CIColor c1)
{
using (var board = new CICheckerboardGenerator () {
Color0 = c0,
Color1 = c1,
Width = (float)Math.Min (frame.Height / 2f, 10),
Center = new CIVector (new nfloat[] { 0, 0 }),
}) {
using (var context = new CIContext (null)) {
return context.CreateCGImage (board.OutputImage, new CGRect (0, 0, frame.Width, frame.Height));
}
}
}
public static CGColor ToCGColor (this CommonColor color)
=> new CGColor (color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
public static NSColor ToNSColor (this CommonColor color)
=> NSColor.FromRgba (color.R, color.G, color.B, color.A);
public static CommonColor Blend (this CommonColor a, CommonColor b)
{
byte C (byte cb1, byte ab1, byte cb2)
{
var c1 = cb1 / 255f;
var a1 = ab1 / 255f;
var c2 = cb2 / 255f;
var c = Math.Max (0, Math.Min (255, (c1 + c2 * (1 - a1)) * 255));
return (byte)c;
}
return new CommonColor (
C (a.R, a.A, b.R),
C (a.G, a.A, b.G),
C (a.B, a.A, b.B),
C (a.A, a.A, b.A));
}
}
}
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