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using System;
using System.Collections.Generic;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
namespace Tango.AnimatedGif
{
static class AnimationCache
{
private class CacheKey
{
private readonly ImageSource _source;
private readonly RepeatBehavior _repeatBehavior;
public CacheKey(ImageSource source, RepeatBehavior repeatBehavior)
{
_source = source;
_repeatBehavior = repeatBehavior;
}
private bool Equals(CacheKey other)
{
return ImageEquals(_source, other._source)
&& Equals(_repeatBehavior, other._repeatBehavior);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != this.GetType()) return false;
return Equals((CacheKey)obj);
}
public override int GetHashCode()
{
unchecked
{
return (ImageGetHashCode(_source) * 397) ^ _repeatBehavior.GetHashCode();
}
}
private static int ImageGetHashCode(ImageSource image)
{
if (image != null)
{
var uri = GetUri(image);
if (uri != null)
return uri.GetHashCode();
}
return 0;
}
private static bool ImageEquals(ImageSource x, ImageSource y)
{
if (Equals(x, y))
return true;
if ((x == null) != (y == null))
return false;
// They can't both be null or Equals would have returned true
// and if any is null, the previous would have detected it
// ReSharper disable PossibleNullReferenceException
if (x.GetType() != y.GetType())
return false;
// ReSharper restore PossibleNullReferenceException
var xUri = GetUri(x);
var yUri = GetUri(y);
return xUri != null && xUri == yUri;
}
private static Uri GetUri(ImageSource image)
{
var bmp = image as BitmapImage;
if (bmp != null && bmp.UriSource != null)
{
if (bmp.UriSource.IsAbsoluteUri)
return bmp.UriSource;
if (bmp.BaseUri != null)
return new Uri(bmp.BaseUri, bmp.UriSource);
}
var frame = image as BitmapFrame;
if (frame != null)
{
string s = frame.ToString();
if (s != frame.GetType().FullName)
{
Uri fUri;
if (Uri.TryCreate(s, UriKind.RelativeOrAbsolute, out fUri))
{
if (fUri.IsAbsoluteUri)
return fUri;
if (frame.BaseUri != null)
return new Uri(frame.BaseUri, fUri);
}
}
}
return null;
}
}
private static readonly Dictionary<CacheKey, ObjectAnimationUsingKeyFrames> _animationCache = new Dictionary<CacheKey, ObjectAnimationUsingKeyFrames>();
private static readonly Dictionary<CacheKey, int> _referenceCount = new Dictionary<CacheKey, int>();
public static void IncrementReferenceCount(ImageSource source, RepeatBehavior repeatBehavior)
{
var cacheKey = new CacheKey(source, repeatBehavior);
int count;
_referenceCount.TryGetValue(cacheKey, out count);
count++;
_referenceCount[cacheKey] = count;
}
public static void DecrementReferenceCount(ImageSource source, RepeatBehavior repeatBehavior)
{
var cacheKey = new CacheKey(source, repeatBehavior);
int count;
_referenceCount.TryGetValue(cacheKey, out count);
if (count > 0)
{
count--;
_referenceCount[cacheKey] = count;
}
if (count == 0)
{
_animationCache.Remove(cacheKey);
_referenceCount.Remove(cacheKey);
}
}
public static void AddAnimation(ImageSource source, RepeatBehavior repeatBehavior, ObjectAnimationUsingKeyFrames animation)
{
var key = new CacheKey(source, repeatBehavior);
_animationCache[key] = animation;
}
public static void RemoveAnimation(ImageSource source, RepeatBehavior repeatBehavior, ObjectAnimationUsingKeyFrames animation)
{
var key = new CacheKey(source, repeatBehavior);
_animationCache.Remove(key);
}
public static ObjectAnimationUsingKeyFrames GetAnimation(ImageSource source, RepeatBehavior repeatBehavior)
{
var key = new CacheKey(source, repeatBehavior);
ObjectAnimationUsingKeyFrames animation;
_animationCache.TryGetValue(key, out animation);
return animation;
}
}
}
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