public CGImage ImageAtIndex(int index)
{
if (index < FrameCount)
{
return(imageSource.CreateImage(index, (CGImageOptions)null));
}
else
{
return(null);
}
}
private static List <UIImage> GetFrames(CGImageSource source)
{
var retval = new List <UIImage>();
for (int i = 0; i < source?.ImageCount; i++)
{
using (var frameImage = source.CreateImage(i, null))
retval.Add(UIImage.FromImage(frameImage));
}
return(retval);
}
private static List <CoreGraphics.CGImage> GetFrames(CGImageSource source)
{
var retval = new List <CoreGraphics.CGImage>();
for (int i = 0; i < source?.ImageCount; i++)
{
var frameImage = source.CreateImage(i, null);
retval.Add(frameImage);
}
return(retval);
}
public AnimatedImage(CGImageSource source)
{
imageSource = source;
FrameCount = imageSource.ImageCount;
var imageProperties = source.CopyProperties(new CGImageOptions());
if (imageProperties != null)
{
LoopCount = LoopCountForProperties(imageProperties);
}
else
{
// The default loop count for a GIF with no loop count specified is 1.
// Infinite loops are indicated by an explicit value of 0 for this property.
LoopCount = 1;
}
var firstImage = source.CreateImage(0, null);
if (firstImage != null)
{
Size = new CGSize(firstImage.Width, firstImage.Height);
}
else
{
Size = CGSize.Empty;
}
var delayTimes = Enumerable.Repeat(1.0 / 30.0, (int)FrameCount).ToArray();
var totalDuration = 0.0;
for (var index = 0; index < FrameCount; index++)
{
var properties = source.CopyProperties(new CGImageOptions(), index);
if (properties != null)
{
var time = FrameDelayForProperties(properties);
if (time != null)
{
delayTimes[index] = time.Value;
}
}
totalDuration += delayTimes[index];
}
Duration = totalDuration;
delays = delayTimes;
}
public void AddFrameData(int index, CGImageSource imageSource)
{
if (index < 0 || index >= _imageCount || index >= imageSource.ImageCount)
{
throw new ArgumentException();
}
double delayTime = 0.1f;
var imageProperties = imageSource.GetProperties(index, null);
using (var gifImageProperties = imageProperties?.Dictionary[ImageIO.CGImageProperties.GIFDictionary])
using (var unclampedDelayTimeValue = gifImageProperties?.ValueForKey(ImageIO.CGImageProperties.GIFUnclampedDelayTime))
using (var delayTimeValue = gifImageProperties?.ValueForKey(ImageIO.CGImageProperties.GIFDelayTime))
{
if (unclampedDelayTimeValue != null)
{
double.TryParse(unclampedDelayTimeValue.ToString(), out delayTime);
}
else if (delayTimeValue != null)
{
double.TryParse(delayTimeValue.ToString(), out delayTime);
}
// Frame delay compability adjustment.
if (delayTime <= 0.02f)
{
delayTime = 0.1f;
}
using (var image = imageSource.CreateImage(index, null))
{
if (image != null)
{
Width = Math.Max(Width, (int)image.Width);
Height = Math.Max(Height, (int)image.Height);
_keyFrames[index]?.Dispose();
_keyFrames[index] = null;
_keyFrames[index] = NSObject.FromObject(image);
_delayTimes[index] = delayTime;
_totalAnimationTime += delayTime;
}
}
}
}
private void InitializeImageFrame(int frame)
{
if (NativeCGImage != null)
{
NativeCGImage.Dispose();
}
imageTransform = CGAffineTransform.MakeIdentity();
SetImageInformation(frame);
var cg = imageSource.CreateImage(frame, null);
imageTransform = new CGAffineTransform(1, 0, 0, -1, 0, cg.Height);
InitWithCGImage(cg);
GuessPixelFormat();
currentFrame = frame;
}
public static UIImage LoadGIFImage(string gifImage)
{
try
{
using (NSData imgData = NSData.FromFile(gifImage))
using (CGImageSource imgSource = CGImageSource.FromData(imgData))
{
NSString gifKey = new NSString(GIFKey);
NSString gifDelayKey = new NSString(GIFDelayTimeKey);
List <double> frameDelays = new List <double>();
// Array that will hold each GIF frame.
UIImage[] frames = new UIImage[imgSource.ImageCount];
// Get all individual frames and their delay time.
for (int i = 0; i < imgSource.ImageCount; i++)
{
// Get the frame's property dictionary and the '{GIF}' dictionary from that.
using (NSDictionary frameProps = imgSource.CopyProperties(null, i))
using (NSMutableDictionary gifDict = (NSMutableDictionary)frameProps[gifKey])
{
double frameDelay = ((NSNumber)gifDict[gifDelayKey]).DoubleValue;
frameDelays.Add(frameDelay);
} //end using
// Fill the array.
using (CGImage cgImage = imgSource.CreateImage(i, null))
{
frames[i] = UIImage.FromImage(cgImage);
} //end using cgImage
} //end for
// Create animated image.
return(UIImage.CreateAnimatedImage(frames, frameDelays.Sum()));
} //end using
} catch (Exception ex)
{
// Something went wrong!
throw ex;
} //end try catch
} //end static UIImage LoadGifImage
public static UIImage AnimateGif(CGImageSource source, nfloat scale)
{
if (source == null)
{
return(null);
}
var frameCount = source.ImageCount;
// no need to animate, fail safe.
if (frameCount <= 1)
{
return(UIImage.FromImage(source.CreateImage(0, null), scale, UIImageOrientation.Up));
}
var frames = GetFrames(source);
var delays = GetDelays(source);
var totalDuration = delays.Sum();
var adjustedFrames = AdjustFramesToSpoofDurations(frames, scale, delays, totalDuration);
return(UIImage.CreateAnimatedImage(adjustedFrames.ToArray(), totalDuration / 100.0));
}
private static UIImageView CreateAnimatedImageView(CGImageSource imageSource, UIImageView imageView = null)
{
var frameCount = imageSource.ImageCount;
var frameImages = new List <NSObject>((int)frameCount);
var frameCGImages = new List <CGImage>((int)frameCount);
var frameDurations = new List <double>((int)frameCount);
var totalFrameDuration = 0.0;
for (int i = 0; i < frameCount; i++)
{
var frameImage = imageSource.CreateImage(i, null);
frameCGImages.Add(frameImage);
frameImages.Add(NSObject.FromObject(frameImage));
var properties = imageSource.GetProperties(i, null);
var duration = properties.Dictionary["{GIF}"];
var delayTime = duration.ValueForKey(new NSString("DelayTime"));
duration.Dispose();
var realDuration = double.Parse(delayTime.ToString());
frameDurations.Add(realDuration);
totalFrameDuration += realDuration;
frameImage.Dispose();
}
var framePercentageDurations = new List <NSNumber>((int)frameCount);
var framePercentageDurationsDouble = new List <double>((int)frameCount);
NSNumber currentDurationPercentage = 0.0f;
double currentDurationDouble = 0.0f;
for (int i = 0; i < frameCount; i++)
{
if (i != 0)
{
var previousDuration = frameDurations[i - 1];
var previousDurationPercentage = framePercentageDurationsDouble[i - 1];
var number = previousDurationPercentage + (previousDuration / totalFrameDuration);
currentDurationDouble = number;
currentDurationPercentage = new NSNumber(number);
}
framePercentageDurationsDouble.Add(currentDurationDouble);
framePercentageDurations.Add(currentDurationPercentage);
}
var imageSourceProperties = imageSource.GetProperties(null);
var imageSourceGIFProperties = imageSourceProperties.Dictionary["{GIF}"];
var loopCount = imageSourceGIFProperties.ValueForKey(new NSString("LoopCount"));
var imageSourceLoopCount = float.Parse(loopCount.ToString());
var frameAnimation = new CAKeyFrameAnimation();
frameAnimation.KeyPath = "contents";
if (imageSourceLoopCount <= 0.0f)
{
frameAnimation.RepeatCount = float.MaxValue;
}
else
{
frameAnimation.RepeatCount = imageSourceLoopCount;
}
imageSourceGIFProperties.Dispose();
frameAnimation.CalculationMode = CAAnimation.AnimationDescrete;
frameAnimation.Values = frameImages.ToArray();
frameAnimation.Duration = totalFrameDuration;
frameAnimation.KeyTimes = framePercentageDurations.ToArray();
frameAnimation.RemovedOnCompletion = false;
var firstFrame = frameCGImages[0];
if (imageView == null)
{
imageView = new UIImageView(new CGRect(0.0f, 0.0f, firstFrame.Width, firstFrame.Height));
}
else
{
imageView.Layer.RemoveAllAnimations();
}
imageView.Layer.AddAnimation(frameAnimation, "contents");
frameAnimation.Dispose();
return(imageView);
}
private static UIImageView CreateAnimatedImageView(CGImageSource imageSource, UIImageView imageView = null)
{
var frameCount = imageSource.ImageCount;
var frameImages = new List<NSObject>((int)frameCount);
var frameCGImages = new List<CGImage>((int)frameCount);
var frameDurations = new List<double>((int)frameCount);
var totalFrameDuration = 0.0;
for (int i = 0; i < frameCount; i++)
{
var frameImage = imageSource.CreateImage(i, null);
frameCGImages.Add(frameImage);
frameImages.Add(NSObject.FromObject(frameImage));
var properties = imageSource.GetProperties(i, null);
var duration = properties.Dictionary["{GIF}"];
var delayTime = duration.ValueForKey(new NSString("DelayTime"));
duration.Dispose ();
var realDuration = double.Parse(delayTime.ToString());
frameDurations.Add(realDuration);
totalFrameDuration += realDuration;
frameImage.Dispose ();
}
var framePercentageDurations = new List<NSNumber>((int)frameCount);
var framePercentageDurationsDouble = new List<double>((int)frameCount);
NSNumber currentDurationPercentage = 0.0f;
double currentDurationDouble = 0.0f;
for (int i = 0; i < frameCount; i++)
{
if (i != 0)
{
var previousDuration = frameDurations[i - 1];
var previousDurationPercentage = framePercentageDurationsDouble[i - 1];
var number = previousDurationPercentage + (previousDuration/totalFrameDuration);
currentDurationDouble = number;
currentDurationPercentage = new NSNumber(number);
}
framePercentageDurationsDouble.Add(currentDurationDouble);
framePercentageDurations.Add(currentDurationPercentage);
}
var imageSourceProperties = imageSource.GetProperties(null);
var imageSourceGIFProperties = imageSourceProperties.Dictionary["{GIF}"];
var loopCount = imageSourceGIFProperties.ValueForKey(new NSString("LoopCount"));
var imageSourceLoopCount = float.Parse(loopCount.ToString());
var frameAnimation = new CAKeyFrameAnimation();
frameAnimation.KeyPath = "contents";
if (imageSourceLoopCount <= 0.0f)
{
frameAnimation.RepeatCount = float.MaxValue;
}
else
{
frameAnimation.RepeatCount = imageSourceLoopCount;
}
imageSourceGIFProperties.Dispose ();
frameAnimation.CalculationMode = CAAnimation.AnimationDescrete;
frameAnimation.Values = frameImages.ToArray();
frameAnimation.Duration = totalFrameDuration;
frameAnimation.KeyTimes = framePercentageDurations.ToArray();
frameAnimation.RemovedOnCompletion = false;
var firstFrame = frameCGImages[0];
if(imageView == null)
imageView = new UIImageView(new CGRect(0.0f, 0.0f, firstFrame.Width, firstFrame.Height));
else
imageView.Layer.RemoveAllAnimations();
imageView.Layer.AddAnimation(frameAnimation, "contents");
frameAnimation.Dispose ();
return imageView;
}
