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using System;
using AppKit;
using CoreGraphics;
using CoreImage;
using Xamarin.PropertyEditing.Drawing;
namespace Xamarin.PropertyEditing.Mac
{
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));
}
public static CGRect Translate (this CGRect rect, double x, double y)
=> new CGRect (
x: rect.X + x,
y: rect.Y + y,
width: rect.Width,
height: rect.Height);
public static CommonColor UpdateRGB (
this CommonColor color,
byte? r = null,
byte? g = null,
byte? b = null,
byte? a = null)
{
return new CommonColor (
r: r ?? color.R,
g: g ?? color.G,
b: b ?? color.B,
a: a ?? color.A);
}
public static CommonColor UpdateHSB (
this CommonColor color,
double? hue = null,
double? saturation = null,
double? brightness = null,
byte? alpha = null)
{
return CommonColor.FromHSB (
hue: hue ?? color.Hue,
saturation: saturation ?? color.Saturation,
brightness: brightness ?? color.Brightness,
alpha: alpha ?? color.A);
}
public static CommonColor UpdateHLS (
this CommonColor color,
double? hue = null,
double? lightness = null,
double? saturation = null,
byte? alpha = null)
{
return CommonColor.FromHLS (
hue: hue ?? color.Hue,
lightness: lightness ?? color.Lightness,
saturation: saturation ?? color.Saturation,
alpha: alpha ?? color.A);
}
public static CommonColor UpdateCMYK (
this CommonColor color,
double? c = null,
double? m = null,
double? y = null,
double? k = null,
byte? alpha = null)
{
return CommonColor.FromCMYK (
c: c ?? color.C,
m: m ?? color.M,
y: y ?? color.Y,
k: k ?? color.K,
alpha: alpha ?? color.A);
}
}
}
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