//Filters
async void ApplyFilter(FilterType filterType)
{
if (currentFilterType == filterType)
{
return;
}
var filterImage = Element as FilterImage;
var handler = GetHandler(filterImage.OriginalSource);
using (UIImage originalImage = await handler.LoadImageAsync(filterImage.OriginalSource))
{
switch (filterType)
{
case FilterType.NoFilter:
filteredImage = UIImage.FromImage(originalImage.CGImage, originalImage.CurrentScale, originalImage.Orientation);
break;
case FilterType.BlackAndWhite:
var blackAndWhiteEffect = new CIPhotoEffectMono()
{
Image = new CoreImage.CIImage(originalImage)
};
filteredImage = ApplyEffect(blackAndWhiteEffect, originalImage);
break;
case FilterType.Hifi:
var hifiControls = new CIColorControls()
{
Image = new CoreImage.CIImage(originalImage),
Brightness = .5F, // Min: 0 Max: 2
Saturation = 1.2F, // Min: -1 Max: 1
Contrast = 2.5F // Min: 0 Max: 4
};
filteredImage = ApplyEffect(hifiControls, originalImage);
break;
case FilterType.Vintage:
var vintageEffect = new CIPhotoEffectChrome()
{
Image = new CoreImage.CIImage(originalImage)
};
filteredImage = ApplyEffect(vintageEffect, originalImage);
break;
case FilterType.Saturated:
var saturatedEffect = new GPUImageSaturationFilter();
saturatedEffect.Saturation = 2.5f;
var imageFiltered = saturatedEffect.CreateFilteredImage(originalImage);
filteredImage = imageFiltered;
break;
}
Control.Image = filteredImage;
currentFilterType = filterType;
}
}
protected override UIImage Transform(UIImage sourceBitmap, string path, ImageSource source, bool isPlaceholder, string key)
{
var effect = new CIPhotoEffectMono()
{
InputImage = sourceBitmap.CGImage
};
var output = effect.OutputImage;
var context = CIContext.FromOptions(null);
CoreGraphics.CGImage cgimage = context.CreateCGImage(output, output.Extent);
return(UIImage.FromImage(cgimage));
}
protected override UIImage Transform(UIImage sourceBitmap, string path, Work.ImageSource source, bool isPlaceholder, string key)
{
using (var effect = new CIPhotoEffectMono()
{
Image = sourceBitmap.CGImage
})
using (var output = effect.OutputImage)
using (var context = CIContext.FromOptions(null))
using (var cgimage = context.CreateCGImage(output, output.Extent))
{
return(UIImage.FromImage(cgimage));
}
}
protected override NSImage Transform(NSImage sourceBitmap, string path, Work.ImageSource source, bool isPlaceholder, string key)
{
return(Helpers.MainThreadDispatcher.PostForResult <NSImage>(() =>
{
using (var inputImage = CIImage.FromCGImage(sourceBitmap.CGImage))
using (var filter = new CIPhotoEffectMono()
{
Image = inputImage
})
using (var resultImage = new NSCIImageRep(filter.OutputImage))
{
var nsImage = new NSImage(resultImage.Size);
nsImage.AddRepresentation(resultImage);
return nsImage;
}
}));
}
/// <summary>
/// Produces a low-contrast black-and-white image.
/// </summary>
/// <returns>The altered image.</returns>
CIImage PhotoEffectMono ()
{
var photo_effect_mono = new CIPhotoEffectMono ()
{
Image = flower
};
return photo_effect_mono.OutputImage;
}
