Class Operation

Wrap a NetVips.Internal.VipsOperation object.

Inheritance

object

CriticalFinalizerObject

SafeHandle

GObject

VipsObject

Operation

Implements

IDisposable

Inherited Members

VipsObject.OnPostClose

VipsObject.GetTypeOf(string)

VipsObject.GetBlurb(string)

VipsObject.GetDescription()

GObject.SignalConnect<T>(string, T, nint)

GObject.SignalHandlerDisconnect(ulong)

GObject.SignalHandlersDisconnectByFunc<T>(T, nint)

GObject.SignalHandlersDisconnectByData(nint)

GObject.ReleaseHandle()

GObject.IsInvalid

SafeHandle.handle

SafeHandle.Close()

SafeHandle.DangerousAddRef(ref bool)

SafeHandle.DangerousGetHandle()

SafeHandle.DangerousRelease()

SafeHandle.Dispose()

SafeHandle.Dispose(bool)

SafeHandle.SetHandle(IntPtr)

SafeHandle.SetHandleAsInvalid()

SafeHandle.IsClosed

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: NetVips

Assembly: NetVips.dll

Syntax

public class Operation : VipsObject, IDisposable

Methods

Block(string, bool)

Set the block state on all operations in the libvips class hierarchy at name and below.

Declaration

public static void Block(string name, bool state)

Parameters

Type	Name	Description
string	name	Set block state at this point and below.
bool	state	The block state to set.

Remarks

For example:

Operation.Block("VipsForeignLoad", true);
Operation.Block("VipsForeignLoadJpeg", false);

Will block all load operations, except JPEG. Use:

$ vips -l

at the command-line to see the class hierarchy. Use BlockUntrusted to set the block state on all untrusted operations.

This call does nothing if the named operation is not found. At least libvips 8.13 is needed.

Call(string, VOption, Image, params object[])

Call a libvips operation.

Declaration

public static object Call(string operationName, VOption kwargs = null, Image matchImage = null, params object[] args)

Parameters

Type	Name	Description
string	operationName	Operation name.
VOption	kwargs	Optional arguments.
Image	matchImage	A Image used as guide.
object[]	args	An arbitrary number and variety of arguments.

Returns

Type	Description
object	A new object.

Remarks

Use this method to call any libvips operation. For example:

using Image blackImage = Operation.Call("black", 10, 10) as Image;

See the Introduction for notes on how this works.

Call(string, VOption, params object[])

Call a libvips operation.

Declaration

public static object Call(string operationName, VOption kwargs = null, params object[] args)

Parameters

Type	Name	Description
string	operationName	Operation name.
VOption	kwargs	Optional arguments.
object[]	args	An arbitrary number and variety of arguments.

Returns

Type	Description
object	A new object.

Remarks

Use this method to call any libvips operation. For example:

using Image blackImage = Operation.Call("black", 10, 10) as Image;

See the Introduction for notes on how this works.

Call(string, params object[])

Call a libvips operation.

Declaration

public static object Call(string operationName, params object[] args)

Parameters

Type	Name	Description
string	operationName	Operation name.
object[]	args	An arbitrary number and variety of arguments.

Returns

Type	Description
object	A new object.

Remarks

Use this method to call any libvips operation. For example:

using Image blackImage = Operation.Call("black", 10, 10) as Image;

See the Introduction for notes on how this works.

GetFlags()

Lookup the set of flags for this operation.

Declaration

public Enums.OperationFlags GetFlags()

Returns

Type	Description
Enums.OperationFlags	Flags for this operation.

NewFromName(string)

Create a new NetVips.Internal.VipsOperation with the specified nickname.

Declaration

public static Operation NewFromName(string operationName)

Parameters

Type	Name	Description
string	operationName	Nickname of operation to create.

Returns

Type	Description
Operation	The new operation.

Remarks

You'll need to set any arguments and build the operation before you can use it. See for a higher-level way to make new operations.

Exceptions

Type	Condition
VipsException	If the operation doesn't exist.

Implements

IDisposable