/// <summary>
/// Registers the specified instance with the dictionary.
/// </summary>
internal static void RegisterHandle(IntPtr handle, SKObject instance)
{
if (handle == IntPtr.Zero || instance == null)
{
return;
}
SKObject objectToDispose = null;
instancesLock.EnterWriteLock();
try {
if (instances.TryGetValue(handle, out var oldValue) && oldValue.Target is SKObject obj && !obj.IsDisposed)
{
#if THROW_OBJECT_EXCEPTIONS
if (obj.OwnsHandle)
{
// a mostly recoverable error
// if there is a managed object, then maybe something happened and the native object is dead
throw new InvalidOperationException(
$"A managed object already exists for the specified native object. " +
$"H: {handle.ToString ("x")} Type: ({obj.GetType ()}, {instance.GetType ()})");
}
#endif
// this means the ownership was handed off to a native object, so clean up the managed side
objectToDispose = obj;
}
instances[handle] = new WeakReference(instance);
} finally {
instancesLock.ExitWriteLock();
}
// dispose the object we just replaced
objectToDispose?.DisposeInternal();
}
internal static void RegisterHandle(IntPtr handle, SKObject instance)
{
if (handle == IntPtr.Zero)
{
return;
}
lock (instances)
{
// find old references
WeakReference reference;
if (instances.TryGetValue(handle, out reference))
{
var shouldReplace =
reference == null ||
reference.Target == null ||
((SKObject)reference.Target).Handle == IntPtr.Zero;
Debug.WriteLineIf(!shouldReplace, "Not replacing existing, living, managed instance with new object.");
// replace the old one if it is dead
instances[handle] = new WeakReference(instance);
}
else
{
// add a new reference
instances.Add(handle, new WeakReference(instance));
}
}
}
public void Reset(SKImageInfo info, IntPtr addr, int rowBytes)
{
var cinfo = SKImageInfoNative.FromManaged(ref info);
SkiaApi.sk_pixmap_reset_with_params(Handle, &cinfo, (void *)addr, (IntPtr)rowBytes);
pixelSource = null;
}
/// <summary>
/// This object will take ownership of the specified object.
/// </summary>
/// <param name="obj">The object to own.</param>
internal void TakeOwnership(SKObject obj)
{
lock (ownedObjects)
{
ownedObjects.Add(obj);
}
obj.RevokeOwnership();
}
internal void TakeOwnership(SKObject obj)
{
lock (ownedObjects)
{
ownedObjects.Add(obj);
}
obj.OwnsHandle = false;
}
public static SKCanvas Create(SKRect bounds, SKWStream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
return(SKObject.Referenced(SKCanvas.GetObject(SkiaApi.sk_svgcanvas_create_with_stream(&bounds, stream.Handle)), stream));
}
public static SKCanvas Create(SKRect bounds, SKXmlWriter writer)
{
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
return(SKObject.GetObject <SKCanvas> (SkiaApi.sk_svgcanvas_create(&bounds, writer.Handle)));
}
public static SKImageInfo ToManaged(ref SKImageInfoNative native) =>
new SKImageInfo
{
ColorSpace = SKObject.GetObject <SKColorSpace> (native.colorspace),
Width = native.width,
Height = native.height,
ColorType = native.colorType,
AlphaType = native.alphaType,
};
public bool UseEncodedData(IntPtr data, ulong length)
{
if (SKObject.SizeOf <IntPtr> () == 4 && length > UInt32.MaxValue)
{
throw new ArgumentOutOfRangeException(nameof(length), "The length exceeds the size of pointers.");
}
return(OnUseEncodedData(data, (IntPtr)length));
}
// Create
public static SKCanvas Create(SKRect bounds, Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
var managed = new SKManagedWStream(stream);
return(SKObject.Owned(Create(bounds, managed), managed));
}
/// <summary>
/// This object will hand ownership over to the specified object.
/// </summary>
/// <param name="owner">The object to give ownership to.</param>
internal void RevokeOwnership(SKObject owner = null)
{
if (owner != null)
{
owner.TakeOwnership(this);
}
else
{
OwnsHandle = false;
}
}
public static SKImageInfo ToManaged(ref SKImageInfoNative native)
{
return(new SKImageInfo
{
ColorSpace = SKObject.GetObject <SKColorSpace> (native.fColorSpace),
Width = native.fWidth,
Height = native.fHeight,
ColorType = native.fColorType,
AlphaType = native.fAlphaType,
});
}
/// <summary>
/// This object will hand ownership over to the specified object.
/// </summary>
/// <param name="owner">The object to give ownership to.</param>
internal void RevokeOwnership(SKObject owner)
{
if (owner != null)
{
owner.TakeOwnership(this);
}
else
{
this.RevokeOwnership();
}
}
public static SKCanvas Create(SKRect bounds, SKXmlWriter writer)
{
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
var canvas = SKCanvas.GetObject(SkiaApi.sk_svgcanvas_create_with_writer(&bounds, writer.Handle));
writer.RevokeOwnership(canvas);
return(SKObject.Referenced(canvas, writer));
}
public static SKCanvas Create(SKRect bounds, SKWStream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
// TODO: there seems to be a memory issue with things getting destroyed in the incorrect order
//return SKObject.Referenced (SKObject.GetObject<SKCanvas> (SkiaApi.sk_svgcanvas_create_with_stream (&bounds, stream.Handle)), stream);
var writer = new SKXmlStreamWriter(stream);
return(SKObject.Owned(SKCanvas.GetObject(SkiaApi.sk_svgcanvas_create_with_writer(&bounds, writer.Handle)), writer));
}
internal static void DeregisterHandle(IntPtr handle, SKObject instance)
{
if (handle == IntPtr.Zero)
{
return;
}
lock (instances)
{
// find any references
WeakReference reference;
if (instances.TryGetValue(handle, out reference))
{
// remove it if it is dead or the correct object
instances.Remove(handle);
}
}
}
internal static bool DeregisterHandle(IntPtr handle, SKObject instance)
{
if (handle == IntPtr.Zero)
{
return(false);
}
lock (instances)
{
// find any references
if (Interlocked.Decrement(ref instance.referenceCount) <= 0 && instances.TryGetValue(handle, out var reference))
{
// remove it if it is dead or the correct object
instances.Remove(handle);
return(true);
}
}
return(false);
}
// Reset
public void Reset()
{
SkiaApi.sk_pixmap_reset(Handle);
pixelSource = null;
}
/// <summary>
/// This object will dispose the specific child object which disposed.
/// </summary>
/// <param name="child">The child object to dispose when the parent is disposed.</param>
internal void SetDisposeChild(SKObject child)
{
lock (ownedObjects) {
ownedObjects.Add(child);
}
}
/// <summary>
/// This object will take ownership of the specified object.
/// </summary>
/// <param name="obj">The object to own.</param>
private void TakeOwnership(SKObject obj)
{
SetDisposeChild(obj);
obj.RevokeOwnership();
}
/// <summary>
/// Removes the registered instance from the dictionary.
/// </summary>
internal static void DeregisterHandle(IntPtr handle, SKObject instance)
{
if (handle == IntPtr.Zero)
{
return;
}
if (instance is ISKSkipObjectRegistration)
{
return;
}
instancesLock.EnterWriteLock();
try {
var existed = instances.TryGetValue(handle, out var weak);
if (existed && (!weak.IsAlive || weak.Target == instance))
{
instances.Remove(handle);
}
else
{
#if THROW_OBJECT_EXCEPTIONS
InvalidOperationException ex = null;
if (!existed)
{
// the object may have been replaced
if (!instance.IsDisposed)
{
// recoverable error
// there was no object there, but we are still alive
ex = new InvalidOperationException(
$"A managed object did not exist for the specified native object. " +
$"H: {handle.ToString ("x")} Type: {instance.GetType ()}");
}
}
else if (weak.Target is SKObject o && o != instance)
{
// there was an object in the dictionary, but it was NOT this object
if (!instance.IsDisposed)
{
// recoverable error
// there was a new living object there, but we are still alive
ex = new InvalidOperationException(
$"Trying to remove a different object with the same native handle. " +
$"H: {handle.ToString ("x")} Type: ({o.GetType ()}, {instance.GetType ()})");
}
}
if (ex != null)
{
if (instance.fromFinalizer)
{
exceptions.Add(ex);
}
else
{
throw ex;
}
}
#endif
}
} finally {
instancesLock.ExitWriteLock();
}
}
protected override void DisposeManaged()
{
base.DisposeManaged();
pixelSource = null;
}
