public static CGColor ToCGColor(this UGColor color)
{
using (var colorSpace = CGColorSpace.CreateSrgb())
{
return(new CGColor(colorSpace, color.ToColorComponents()));
}
}
public UGRadialGradientBrush(IUGContext context, Vector2 center, float radius, IEnumerable <UGGradientStop> gradientStops, UGEdgeBehavior edgeBehavior)
{
Center = center;
Radius = radius;
EdgeBehavior = edgeBehavior;
Stops = gradientStops.ToArray();
if (Stops.Length < 2)
{
throw new ArgumentException(nameof(gradientStops));
}
unsafe
{
var baseFunction = CGFunctionsHelper.GetCGFunction(EdgeBehavior);
CGFunction.CGFunctionEvaluate function = (data, outData) => baseFunction(Stops, data, outData);
var domain = new nfloat[] { 0, edgeBehavior != UGEdgeBehavior.Clamp ? 1.5F : 1 };
_function = new CGFunction(domain, new nfloat[] { 0, 1, 0, 1, 0, 1, 0, 1 }, function);
}
var cgCenter = Center.ToCGPoint();
var cgRadius = EdgeBehavior != UGEdgeBehavior.Clamp ? 1.5F * Radius : Radius;
using (var colorSpace = CGColorSpace.CreateSrgb())
{
_native = CGShading.CreateRadial(colorSpace, cgCenter, 0F, cgCenter, cgRadius, _function, true, true);
}
}
public IUGContext CreateDrawingSession()
{
var bpp = 8;
var width = (nint)(Scale * Width + .5F);
var height = (nint)(Scale * Height + .5F);
var stride = 4 * width;
var canvasRect = new CGRect(0F, 0F, Width, Height);
using (var colorSpace = CGColorSpace.CreateSrgb())
{
var context = new CGBitmapContext(null, width, height, bpp, stride, colorSpace, CGImageAlphaInfo.PremultipliedFirst);
context.ScaleCTM(Scale, Scale);
return(new UGContext(context, canvasRect, Scale, () =>
{
_native = context.ToImage();
context.Dispose();
context = null;
}));
}
}
internal static bool SaveImageWithMetadataiOS13(UIImage image, float quality, NSDictionary meta, string path, string pathExtension)
{
try
{
pathExtension = pathExtension.ToLowerInvariant();
var finalQuality = quality;
var imageData = pathExtension == "jpg" ? image.AsJPEG(finalQuality) : image.AsPNG();
//continue to move down quality , rare instances
while (imageData == null && finalQuality > 0)
{
finalQuality -= 0.05f;
imageData = image.AsJPEG(finalQuality);
}
if (imageData == null)
{
throw new NullReferenceException("Unable to convert image to jpeg, please ensure file exists or lower quality level");
}
// Copy over meta data
using var ciImage = CIImage.FromData(imageData);
using var newImageSource = ciImage.CreateBySettingProperties(meta);
using var ciContext = new CIContext();
if (pathExtension == "jpg")
{
return(ciContext.WriteJpegRepresentation(newImageSource, NSUrl.FromFilename(path), CGColorSpace.CreateSrgb(), new NSDictionary(), out var error));
}
return(ciContext.WritePngRepresentation(newImageSource, NSUrl.FromFilename(path), CIFormat.ARGB8, CGColorSpace.CreateSrgb(), new NSDictionary(), out var error2));
}
catch (Exception ex)
{
Console.WriteLine($"Unable to save image with metadata: {ex}");
}
return(false);
}
public static CGColor ToCGColor(Xamarin.Forms.Color color)
{
return(new CGColor(CGColorSpace.CreateSrgb(), new nfloat[] { (float)color.R, (float)color.G, (float)color.B, (float)color.A }));
}
public static CGColor TosRGBCGColor(this Color color)
{
return(new CGColor(CGColorSpace.CreateSrgb(), new nfloat[] { (float)color.R, (float)color.G, (float)color.B, (float)color.A }));
}
static bool SaveImageWithMetadataiOS13(UIImage image, NSDictionary meta, string path, string fileExt)
{
try
{
var imageData = fileExt == "png" ? image.AsPNG() : image.AsJPEG();
if (imageData == null)
{
throw new NullReferenceException("Unable to convert image to jpeg, please ensure file exists or lower quality level");
}
// Copy over meta data
using (var ciImage = CIImage.FromData(imageData))
using (var newImageSource = ciImage.CreateBySettingProperties(meta))
using (var ciContext = new CIContext())
{
if (fileExt == "png")
{
return(ciContext.WritePngRepresentation(newImageSource, NSUrl.FromFilename(path), CIFormat.ARGB8, CGColorSpace.CreateSrgb(), new NSDictionary(), out var error2));
}
return(ciContext.WriteJpegRepresentation(newImageSource, NSUrl.FromFilename(path), CGColorSpace.CreateSrgb(), new NSDictionary(), out var error));
}
}
catch (Exception ex)
{
Console.WriteLine($"Unable to save image with metadata: {ex}");
}
return(false);
}
