public static NSImage ToSolidColor(NSImage imageSource, int r, int g, int b, int a)
{
CGRect drawRect = new CGRect(0d, 0d, imageSource.CGImage.Width, imageSource.CGImage.Height);
var colorSpace = CGColorSpace.CreateDeviceRGB();
const int bytesPerPixel = 4;
int width = (int)imageSource.CGImage.Width;
int height = (int)imageSource.CGImage.Height;
var bytes = new byte[width * height * bytesPerPixel];
int bytesPerRow = bytesPerPixel * width;
const int bitsPerComponent = 8;
using (var context = new CGBitmapContext(bytes, width, height, bitsPerComponent, bytesPerRow, colorSpace, CGBitmapFlags.PremultipliedLast | CGBitmapFlags.ByteOrder32Big))
{
context.TranslateCTM(0, drawRect.Size.Height);
context.ScaleCTM(1.0f, -1.0f);
context.ClipToMask(drawRect, imageSource.CGImage);
context.SetFillColor(new CGColor(r, g, b, a));
context.FillRect(drawRect);
using (var output = context.ToImage())
{
return(new NSImage(output, CGSize.Empty));
}
}
}
public static UIImage AdjustImage(CGRect rect, UIImage template, CGBlendMode mode, nfloat red, nfloat green, nfloat blue, nfloat alpha)
{
using (var cs = CGColorSpace.CreateDeviceRGB()) {
using (var context = new CGBitmapContext(IntPtr.Zero, (int)rect.Width, (int)rect.Height, 8, (int)rect.Height * 4, cs, CGImageAlphaInfo.PremultipliedLast)) {
context.TranslateCTM(0.0f, 0f);
//context.ScaleCTM(1.0f,-1.0f);
context.DrawImage(rect, template.CGImage);
context.SetBlendMode(mode);
context.ClipToMask(rect, template.CGImage);
context.SetFillColor(red, green, blue, alpha);
context.FillRect(rect);
return(UIImage.FromImage(context.ToImage()));
}
}
}
public static UIImage AdjustImage (RectangleF rect, UIImage template, CGBlendMode mode,
float red, float green, float blue, float alpha)
{
using (var cs = CGColorSpace.CreateDeviceRGB ()) {
using (var context = new CGBitmapContext (IntPtr.Zero, (int)rect.Width, (int)rect.Height, 8,
(int)rect.Height * 4, cs, CGImageAlphaInfo.PremultipliedLast)) {
context.TranslateCTM (0.0f, 0f);
//context.ScaleCTM(1.0f,-1.0f);
context.DrawImage (rect, template.CGImage);
context.SetBlendMode (mode);
context.ClipToMask (rect, template.CGImage);
context.SetFillColor (red, green, blue, alpha);
context.FillRect (rect);
return UIImage.FromImage (context.ToImage ());
}
}
}
public static UIImage MaskeWithColor(this UIImage image, UIColor color)
{
var maskImage = image.CGImage;
var width = image.Size.Width;
var height = image.Size.Height;
var bounds = new CGRect(0, 0, width, height);
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
{
using (var bitmapContext = new CGBitmapContext(null, (nint)width, (nint)height, 8, 0, colorSpace, CGImageAlphaInfo.PremultipliedLast))
{
bitmapContext.ClipToMask(bounds, maskImage);
bitmapContext.SetFillColor(color.CGColor);
bitmapContext.FillRect(bounds);
using (var cImage = bitmapContext.ToImage())
{
var coloredImage = UIImage.FromImage(cImage);
return(coloredImage);
}
}
}
}
