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vtkImageBlend Class Reference

blend images together using alpha or opacity More...

#include <vtkImageBlend.h>

Inheritance diagram for vtkImageBlend:
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Collaboration diagram for vtkImageBlend:
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Public Types

typedef vtkThreadedImageAlgorithm Superclass
 
- Public Types inherited from vtkThreadedImageAlgorithm
typedef vtkImageAlgorithm Superclass
 
- Public Types inherited from vtkImageAlgorithm
typedef vtkAlgorithm Superclass
 
- Public Types inherited from vtkAlgorithm
typedef vtkObject Superclass
 
- Public Types inherited from vtkObject
typedef vtkObjectBase Superclass
 

Public Member Functions

virtual const char * GetClassName ()
 
virtual int IsA (const char *type)
 
void PrintSelf (ostream &os, vtkIndent indent)
 
virtual void ReplaceNthInputConnection (int idx, vtkAlgorithmOutput *input)
 
int GetNumberOfInputs ()
 
void SetInput (int num, vtkDataObject *input)
 
void SetInput (vtkDataObject *input)
 
vtkDataObjectGetInput (int num)
 
vtkDataObjectGetInput ()
 
void SetOpacity (int idx, double opacity)
 
double GetOpacity (int idx)
 
void SetStencil (vtkImageStencilData *stencil)
 
vtkImageStencilDataGetStencil ()
 
virtual void SetBlendMode (int)
 
virtual int GetBlendMode ()
 
void SetBlendModeToNormal ()
 
void SetBlendModeToCompound ()
 
const char * GetBlendModeAsString (void)
 
virtual void SetCompoundThreshold (double)
 
virtual double GetCompoundThreshold ()
 
- Public Member Functions inherited from vtkThreadedImageAlgorithm
virtual void ThreadedExecute (vtkImageData *inData, vtkImageData *outData, int extent[6], int threadId)
 
virtual void SetNumberOfThreads (int)
 
virtual int GetNumberOfThreads ()
 
virtual int SplitExtent (int splitExt[6], int startExt[6], int num, int total)
 
- Public Member Functions inherited from vtkImageAlgorithm
vtkDataObjectGetInput (int port)
 
vtkDataObjectGetInput ()
 
vtkImageDataGetImageDataInput (int port)
 
vtkImageDataGetOutput ()
 
vtkImageDataGetOutput (int)
 
virtual void SetOutput (vtkDataObject *d)
 
virtual int ProcessRequest (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
 
void SetInput (vtkDataObject *)
 
void SetInput (int, vtkDataObject *)
 
virtual void AddInput (vtkDataObject *)
 
virtual void AddInput (int, vtkDataObject *)
 
- Public Member Functions inherited from vtkAlgorithm
int HasExecutive ()
 
vtkExecutiveGetExecutive ()
 
virtual void SetExecutive (vtkExecutive *executive)
 
virtual int ModifyRequest (vtkInformation *request, int when)
 
vtkInformationGetInputPortInformation (int port)
 
vtkInformationGetOutputPortInformation (int port)
 
int GetNumberOfInputPorts ()
 
int GetNumberOfOutputPorts ()
 
void UpdateProgress (double amount)
 
vtkInformationGetInputArrayInformation (int idx)
 
void RemoveAllInputs ()
 
vtkDataObjectGetOutputDataObject (int port)
 
virtual void RemoveInputConnection (int port, vtkAlgorithmOutput *input)
 
int GetNumberOfInputConnections (int port)
 
int GetTotalNumberOfInputConnections ()
 
vtkAlgorithmOutputGetInputConnection (int port, int index)
 
virtual void Update ()
 
virtual void UpdateInformation ()
 
virtual void UpdateWholeExtent ()
 
void ConvertTotalInputToPortConnection (int ind, int &port, int &conn)
 
virtual double ComputePriority ()
 
int ProcessRequest (vtkInformation *request, vtkCollection *inInfo, vtkInformationVector *outInfo)
 
virtual int ComputePipelineMTime (vtkInformation *request, vtkInformationVector **inInfoVec, vtkInformationVector *outInfoVec, int requestFromOutputPort, unsigned long *mtime)
 
virtual vtkInformationGetInformation ()
 
virtual void SetInformation (vtkInformation *)
 
virtual void Register (vtkObjectBase *o)
 
virtual void UnRegister (vtkObjectBase *o)
 
virtual void SetAbortExecute (int)
 
virtual int GetAbortExecute ()
 
virtual void AbortExecuteOn ()
 
virtual void AbortExecuteOff ()
 
virtual void SetProgress (double)
 
virtual double GetProgress ()
 
void SetProgressText (const char *ptext)
 
virtual char * GetProgressText ()
 
virtual unsigned long GetErrorCode ()
 
virtual void SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, const char *name)
 
virtual void SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, int fieldAttributeType)
 
virtual void SetInputArrayToProcess (int idx, vtkInformation *info)
 
virtual void SetInputArrayToProcess (int idx, int port, int connection, const char *fieldAssociation, const char *attributeTypeorName)
 
vtkDataObjectGetInputDataObject (int port, int connection)
 
virtual void SetInputConnection (int port, vtkAlgorithmOutput *input)
 
virtual void SetInputConnection (vtkAlgorithmOutput *input)
 
virtual void AddInputConnection (int port, vtkAlgorithmOutput *input)
 
virtual void AddInputConnection (vtkAlgorithmOutput *input)
 
vtkAlgorithmOutputGetOutputPort (int index)
 
vtkAlgorithmOutputGetOutputPort ()
 
virtual void SetReleaseDataFlag (int)
 
virtual int GetReleaseDataFlag ()
 
void ReleaseDataFlagOn ()
 
void ReleaseDataFlagOff ()
 
int UpdateExtentIsEmpty (vtkDataObject *output)
 
int UpdateExtentIsEmpty (vtkInformation *pinfo, int extentType)
 
- Public Member Functions inherited from vtkObject
virtual void DebugOn ()
 
virtual void DebugOff ()
 
unsigned char GetDebug ()
 
void SetDebug (unsigned char debugFlag)
 
virtual void Modified ()
 
virtual unsigned long GetMTime ()
 
unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
 
unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
 
vtkCommandGetCommand (unsigned long tag)
 
void RemoveObserver (vtkCommand *)
 
void RemoveObservers (unsigned long event, vtkCommand *)
 
void RemoveObservers (const char *event, vtkCommand *)
 
int HasObserver (unsigned long event, vtkCommand *)
 
int HasObserver (const char *event, vtkCommand *)
 
void RemoveObserver (unsigned long tag)
 
void RemoveObservers (unsigned long event)
 
void RemoveObservers (const char *event)
 
void RemoveAllObservers ()
 
int HasObserver (unsigned long event)
 
int HasObserver (const char *event)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 
int InvokeEvent (unsigned long event, void *callData)
 
int InvokeEvent (const char *event, void *callData)
 
int InvokeEvent (unsigned long event)
 
int InvokeEvent (const char *event)
 
- Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
 
virtual void Delete ()
 
virtual void FastDelete ()
 
void Print (ostream &os)
 
void SetReferenceCount (int)
 
void PrintRevisions (ostream &os)
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 
int GetReferenceCount ()
 

Static Public Member Functions

static vtkImageBlendNew ()
 
static int IsTypeOf (const char *type)
 
static vtkImageBlendSafeDownCast (vtkObject *o)
 
- Static Public Member Functions inherited from vtkThreadedImageAlgorithm
static int IsTypeOf (const char *type)
 
static vtkThreadedImageAlgorithmSafeDownCast (vtkObject *o)
 
- Static Public Member Functions inherited from vtkImageAlgorithm
static int IsTypeOf (const char *type)
 
static vtkImageAlgorithmSafeDownCast (vtkObject *o)
 
- Static Public Member Functions inherited from vtkAlgorithm
static vtkAlgorithmNew ()
 
static int IsTypeOf (const char *type)
 
static vtkAlgorithmSafeDownCast (vtkObject *o)
 
static void SetDefaultExecutivePrototype (vtkExecutive *proto)
 
static vtkInformationIntegerKeyINPUT_IS_OPTIONAL ()
 
static vtkInformationIntegerKeyINPUT_IS_REPEATABLE ()
 
static
vtkInformationInformationVectorKey
INPUT_REQUIRED_FIELDS ()
 
static
vtkInformationStringVectorKey
INPUT_REQUIRED_DATA_TYPE ()
 
static
vtkInformationInformationVectorKey
INPUT_ARRAYS_TO_PROCESS ()
 
static vtkInformationIntegerKeyINPUT_PORT ()
 
static vtkInformationIntegerKeyINPUT_CONNECTION ()
 
static vtkInformationIntegerKeyPRESERVES_DATASET ()
 
static vtkInformationIntegerKeyPRESERVES_GEOMETRY ()
 
static vtkInformationIntegerKeyPRESERVES_BOUNDS ()
 
static vtkInformationIntegerKeyPRESERVES_TOPOLOGY ()
 
static vtkInformationIntegerKeyPRESERVES_ATTRIBUTES ()
 
static vtkInformationIntegerKeyPRESERVES_RANGES ()
 
- Static Public Member Functions inherited from vtkObject
static int IsTypeOf (const char *type)
 
static vtkObjectSafeDownCast (vtkObject *o)
 
static vtkObjectNew ()
 
static void BreakOnError ()
 
static void SetGlobalWarningDisplay (int val)
 
static void GlobalWarningDisplayOn ()
 
static void GlobalWarningDisplayOff ()
 
static int GetGlobalWarningDisplay ()
 
- Static Public Member Functions inherited from vtkObjectBase
static int IsTypeOf (const char *name)
 
static vtkObjectBaseNew ()
 

Protected Member Functions

 vtkImageBlend ()
 
 ~vtkImageBlend ()
 
virtual int RequestUpdateExtent (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
 
void InternalComputeInputUpdateExtent (int inExt[6], int outExt[6], int inWExtent[6])
 
void ThreadedRequestData (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector, vtkImageData ***inData, vtkImageData **outData, int ext[6], int id)
 
virtual int FillInputPortInformation (int, vtkInformation *)
 
virtual int RequestData (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector)
 
- Protected Member Functions inherited from vtkThreadedImageAlgorithm
 vtkThreadedImageAlgorithm ()
 
 ~vtkThreadedImageAlgorithm ()
 
- Protected Member Functions inherited from vtkImageAlgorithm
 vtkImageAlgorithm ()
 
 ~vtkImageAlgorithm ()
 
virtual int RequestInformation (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector)
 
virtual void CopyInputArrayAttributesToOutput (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector)
 
virtual void AllocateOutputData (vtkImageData *out, int *uExtent)
 
virtual vtkImageDataAllocateOutputData (vtkDataObject *out)
 
virtual void CopyAttributeData (vtkImageData *in, vtkImageData *out, vtkInformationVector **inputVector)
 
virtual int FillOutputPortInformation (int port, vtkInformation *info)
 
virtual void ExecuteData (vtkDataObject *output)
 
virtual void Execute ()
 
- Protected Member Functions inherited from vtkAlgorithm
 vtkAlgorithm ()
 
 ~vtkAlgorithm ()
 
virtual void SetNumberOfInputPorts (int n)
 
virtual void SetNumberOfOutputPorts (int n)
 
int InputPortIndexInRange (int index, const char *action)
 
int OutputPortIndexInRange (int index, const char *action)
 
int GetInputArrayAssociation (int idx, vtkInformationVector **inputVector)
 
virtual vtkExecutiveCreateDefaultExecutive ()
 
virtual void ReportReferences (vtkGarbageCollector *)
 
virtual void SetNumberOfInputConnections (int port, int n)
 
int GetInputArrayAssociation (int idx, int connection, vtkInformationVector **inputVector)
 
int GetInputArrayAssociation (int idx, vtkDataObject *input)
 
vtkDataArrayGetInputArrayToProcess (int idx, vtkInformationVector **inputVector)
 
vtkDataArrayGetInputArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)
 
vtkDataArrayGetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)
 
vtkDataArrayGetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)
 
vtkDataArrayGetInputArrayToProcess (int idx, vtkDataObject *input)
 
vtkDataArrayGetInputArrayToProcess (int idx, vtkDataObject *input, int &association)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, vtkDataObject *input)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, vtkDataObject *input, int &association)
 
vtkInformationGetInputArrayFieldInformation (int idx, vtkInformationVector **inputVector)
 
virtual void SetNthInputConnection (int port, int index, vtkAlgorithmOutput *input)
 
virtual void SetErrorCode (unsigned long)
 
- Protected Member Functions inherited from vtkObject
 vtkObject ()
 
virtual ~vtkObject ()
 
virtual void RegisterInternal (vtkObjectBase *, int check)
 
virtual void UnRegisterInternal (vtkObjectBase *, int check)
 
void InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=NULL)
 
void InternalReleaseFocus ()
 
- Protected Member Functions inherited from vtkObjectBase
 vtkObjectBase ()
 
virtual ~vtkObjectBase ()
 
virtual void CollectRevisions (ostream &os)
 
 vtkObjectBase (const vtkObjectBase &)
 
void operator= (const vtkObjectBase &)
 

Protected Attributes

double * Opacity
 
int OpacityArrayLength
 
int BlendMode
 
double CompoundThreshold
 
int DataWasPassed
 
- Protected Attributes inherited from vtkThreadedImageAlgorithm
vtkMultiThreaderThreader
 
int NumberOfThreads
 
- Protected Attributes inherited from vtkAlgorithm
vtkInformationInformation
 
double Progress
 
char * ProgressText
 
unsigned long ErrorCode
 
- Protected Attributes inherited from vtkObject
unsigned char Debug
 
vtkTimeStamp MTime
 
vtkSubjectHelper * SubjectHelper
 
- Protected Attributes inherited from vtkObjectBase
int ReferenceCount
 
vtkWeakPointerBase ** WeakPointers
 

Additional Inherited Members

- Public Attributes inherited from vtkAlgorithm
int AbortExecute
 
- Static Protected Member Functions inherited from vtkAlgorithm
static vtkInformationIntegerKeyPORT_REQUIREMENTS_FILLED ()
 
- Static Protected Attributes inherited from vtkAlgorithm
static vtkExecutiveDefaultExecutivePrototype
 

Detailed Description

blend images together using alpha or opacity

vtkImageBlend takes L, LA, RGB, or RGBA images as input and blends them according to the alpha values and/or the opacity setting for each input.

The spacing, origin, extent, and number of components of the output are the same as those for the first input. If the input has an alpha component, then this component is copied unchanged into the output. In addition, if the first input has either one component or two components i.e. if it is either L (greyscale) or LA (greyscale + alpha) then all other inputs must also be L or LA.

Different blending modes are available:

Normal (default) : This is the standard blending mode used by OpenGL and other graphics packages. The output always has the same number of components and the same extent as the first input. The alpha value of the first input is not used in the blending computation, instead it is copied directly to the output.

output <- input[0]
foreach input i {
foreach pixel px {
r <- input[i](px)(alpha) * opacity[i]
f <- (255 - r)
output(px) <- output(px) * f + input(px) * r
}
}

Compound : Images are compounded together and each component is scaled by the sum of the alpha/opacity values. Use the CompoundThreshold method to set specify a threshold in compound mode. Pixels with opacity*alpha less or equal than this threshold are ignored. The alpha value of the first input, if present, is NOT copied to the alpha value of the output. The output always has the same number of components and the same extent as the first input.

output <- 0
foreach pixel px {
sum <- 0
foreach input i {
r <- input[i](px)(alpha) * opacity(i)
sum <- sum + r
if r > threshold {
output(px) <- output(px) + input(px) * r
}
}
output(px) <- output(px) / sum
}
Tests:
vtkImageBlend (Tests)

Definition at line 87 of file vtkImageBlend.h.

Member Typedef Documentation

Definition at line 91 of file vtkImageBlend.h.

Constructor & Destructor Documentation

vtkImageBlend::vtkImageBlend ( )
protected
vtkImageBlend::~vtkImageBlend ( )
protected

Member Function Documentation

static vtkImageBlend* vtkImageBlend::New ( )
static
virtual const char* vtkImageBlend::GetClassName ( )
virtual

Reimplemented from vtkThreadedImageAlgorithm.

static int vtkImageBlend::IsTypeOf ( const char *  type)
static
virtual int vtkImageBlend::IsA ( const char *  name)
virtual

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkThreadedImageAlgorithm.

static vtkImageBlend* vtkImageBlend::SafeDownCast ( vtkObject o)
static
void vtkImageBlend::PrintSelf ( ostream &  os,
vtkIndent  indent 
)
virtual

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkThreadedImageAlgorithm.

virtual void vtkImageBlend::ReplaceNthInputConnection ( int  idx,
vtkAlgorithmOutput input 
)
virtual

Replace one of the input connections with a new input. You can only replace input connections that you previously created with AddInputConnection() or, in the case of the first input, with SetInputConnection().

void vtkImageBlend::SetInput ( int  num,
vtkDataObject input 
)

Set an Input of this filter. This method is only for support of old-style pipeline connections. When writing new code you should use SetInputConnection(), AddInputConnection(), and ReplaceNthInputConnection() instead.

void vtkImageBlend::SetInput ( vtkDataObject input)
inline

Set an Input of this filter. This method is only for support of old-style pipeline connections. When writing new code you should use SetInputConnection(), AddInputConnection(), and ReplaceNthInputConnection() instead.

Definition at line 106 of file vtkImageBlend.h.

vtkDataObject* vtkImageBlend::GetInput ( int  num)

Get one input to this filter. This method is only for support of old-style pipeline connections. When writing new code you should use vtkAlgorithm::GetInputConnection(0, num).

vtkDataObject* vtkImageBlend::GetInput ( )
inline

Get one input to this filter. This method is only for support of old-style pipeline connections. When writing new code you should use vtkAlgorithm::GetInputConnection(0, num).

Definition at line 114 of file vtkImageBlend.h.

int vtkImageBlend::GetNumberOfInputs ( )
inline

Get the number of inputs to this filter. This method is only for support of old-style pipeline connections. When writing new code you should use vtkAlgorithm::GetNumberOfInputConnections(0).

Definition at line 120 of file vtkImageBlend.h.

void vtkImageBlend::SetOpacity ( int  idx,
double  opacity 
)

Set the opacity of an input image: the alpha values of the image are multiplied by the opacity. The opacity of image idx=0 is ignored.

double vtkImageBlend::GetOpacity ( int  idx)

Set the opacity of an input image: the alpha values of the image are multiplied by the opacity. The opacity of image idx=0 is ignored.

void vtkImageBlend::SetStencil ( vtkImageStencilData stencil)

Set a stencil to apply when blending the data.

vtkImageStencilData* vtkImageBlend::GetStencil ( )

Set a stencil to apply when blending the data.

virtual void vtkImageBlend::SetBlendMode ( int  )
virtual

Set the blend mode

virtual int vtkImageBlend::GetBlendMode ( )
virtual

Set the blend mode

void vtkImageBlend::SetBlendModeToNormal ( )
inline

Set the blend mode

Definition at line 141 of file vtkImageBlend.h.

void vtkImageBlend::SetBlendModeToCompound ( )
inline

Set the blend mode

Definition at line 143 of file vtkImageBlend.h.

const char * vtkImageBlend::GetBlendModeAsString ( void  )
inline

Get the blending mode as a descriptive string

Definition at line 193 of file vtkImageBlend.h.

virtual void vtkImageBlend::SetCompoundThreshold ( double  )
virtual

Specify a threshold in compound mode. Pixels with opacity*alpha less or equal the threshold are ignored.

virtual double vtkImageBlend::GetCompoundThreshold ( )
virtual

Specify a threshold in compound mode. Pixels with opacity*alpha less or equal the threshold are ignored.

virtual int vtkImageBlend::RequestUpdateExtent ( vtkInformation ,
vtkInformationVector **  ,
vtkInformationVector  
)
protectedvirtual

Reimplemented from vtkImageAlgorithm.

void vtkImageBlend::InternalComputeInputUpdateExtent ( int  inExt[6],
int  outExt[6],
int  inWExtent[6] 
)
protected
void vtkImageBlend::ThreadedRequestData ( vtkInformation request,
vtkInformationVector **  inputVector,
vtkInformationVector outputVector,
vtkImageData ***  inData,
vtkImageData **  outData,
int  extent[6],
int  threadId 
)
protectedvirtual

If the subclass does not define an Execute method, then the task will be broken up, multiple threads will be spawned, and each thread will call this method. It is public so that the thread functions can call this method.

Reimplemented from vtkThreadedImageAlgorithm.

virtual int vtkImageBlend::FillInputPortInformation ( int  port,
vtkInformation info 
)
protectedvirtual

Fill the input port information objects for this algorithm. This is invoked by the first call to GetInputPortInformation for each port so subclasses can specify what they can handle.

Reimplemented from vtkImageAlgorithm.

virtual int vtkImageBlend::RequestData ( vtkInformation request,
vtkInformationVector **  inputVector,
vtkInformationVector outputVector 
)
protectedvirtual

This is called by the superclass. This is the method you should override.

Reimplemented from vtkThreadedImageAlgorithm.

Member Data Documentation

double* vtkImageBlend::Opacity
protected

Definition at line 180 of file vtkImageBlend.h.

int vtkImageBlend::OpacityArrayLength
protected

Definition at line 181 of file vtkImageBlend.h.

int vtkImageBlend::BlendMode
protected

Definition at line 182 of file vtkImageBlend.h.

double vtkImageBlend::CompoundThreshold
protected

Definition at line 183 of file vtkImageBlend.h.

int vtkImageBlend::DataWasPassed
protected

Definition at line 184 of file vtkImageBlend.h.


The documentation for this class was generated from the following file: