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vtkImageBlend.cxx
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vtkImageBlend.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageBlend.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkImageBlend.h"
#include "vtkAlgorithmOutput.h"
#include "vtkImageData.h"
#include "vtkImageStencilData.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkPointData.h"
vtkStandardNewMacro(vtkImageBlend);
//----------------------------------------------------------------------------
vtkImageBlend::vtkImageBlend()
{
this->Opacity = 0;
this->OpacityArrayLength = 0;
this->BlendMode = VTK_IMAGE_BLEND_MODE_NORMAL;
this->CompoundThreshold = 0.0;
this->DataWasPassed = 0;
// we have the image inputs and the optional stencil input
this->SetNumberOfInputPorts(2);
}
//----------------------------------------------------------------------------
vtkImageBlend::~vtkImageBlend()
{
if (this->Opacity)
{
delete [] this->Opacity;
}
this->OpacityArrayLength = 0;
}
//----------------------------------------------------------------------------
void vtkImageBlend::ReplaceNthInputConnection(int idx,
vtkAlgorithmOutput *input)
{
if (idx < 0 || idx >= this->GetNumberOfInputConnections(0))
{
vtkErrorMacro("Attempt to replace connection idx " << idx
<< " of input port " << 0 << ", which has only "
<< this->GetNumberOfInputConnections(0)
<< " connections.");
return;
}
if (!input || !input->GetProducer())
{
vtkErrorMacro("Attempt to replace connection index " << idx
<< " for input port " << 0 << " with " <<
(!input ? "a null input." : "an input with no producer."));
return;
}
this->SetNthInputConnection(0, idx, input);
}
//----------------------------------------------------------------------------
// The default vtkImageAlgorithm semantics are that SetInput() puts
// each input on a different port, we want all the image inputs to
// go on the first port.
void vtkImageBlend::SetInput(int idx, vtkDataObject *input)
{
// Ask the superclass to connect the input.
this->SetNthInputConnection(0, idx, (input ? input->GetProducerPort() : 0));
}
//----------------------------------------------------------------------------
vtkDataObject *vtkImageBlend::GetInput(int idx)
{
if (this->GetNumberOfInputConnections(0) <= idx)
{
return 0;
}
return vtkImageData::SafeDownCast(
this->GetExecutive()->GetInputData(0, idx));
}
//----------------------------------------------------------------------------
void vtkImageBlend::SetStencil(vtkImageStencilData *stencil)
{
// if stencil is null, then set the input port to null
this->SetNthInputConnection(1, 0,
(stencil ? stencil->GetProducerPort() : 0));
}
//----------------------------------------------------------------------------
vtkImageStencilData *vtkImageBlend::GetStencil()
{
if (this->GetNumberOfInputConnections(1) < 1)
{
return 0;
}
return vtkImageStencilData::SafeDownCast(
this->GetExecutive()->GetInputData(1, 0));
}
//----------------------------------------------------------------------------
void vtkImageBlend::SetOpacity(int idx, double opacity)
{
int i;
int newLength;
double *newArray;
if (opacity < 0.0)
{
opacity = 0.0;
}
if (opacity > 1.0)
{
opacity = 1.0;
}
if (idx >= this->OpacityArrayLength)
{
newLength = idx + 1;
newArray = new double[newLength];
for (i = 0; i < this->OpacityArrayLength; i++)
{
newArray[i] = this->Opacity[i];
}
for (; i < newLength; i++)
{
newArray[i] = 1.0;
}
if (this->Opacity)
{
delete [] this->Opacity;
}
this->Opacity = newArray;
this->OpacityArrayLength = newLength;
}
if (this->Opacity[idx] != opacity)
{
this->Opacity[idx] = opacity;
this->Modified();
}
}
//----------------------------------------------------------------------------
double vtkImageBlend::GetOpacity(int idx)
{
if (idx >= this->OpacityArrayLength)
{
return 1.0;
}
return this->Opacity[idx];
}
//----------------------------------------------------------------------------
int vtkImageBlend::RequestInformation (
vtkInformation * vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *vtkNotUsed( outputVector ))
{
// get the info objects
vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
// this is some scary stuff, propagating info upstream??? - Ken
vtkImageStencilData *stencil = this->GetStencil();
if (stencil)
{
stencil->SetSpacing(inInfo->Get(vtkDataObject::SPACING()));
stencil->SetOrigin(inInfo->Get(vtkDataObject::ORIGIN()));
}
return 1;
}
//----------------------------------------------------------------------------
// This method computes the extent of the input region necessary to generate
// an output region. Before this method is called "region" should have the
// extent of the output region. After this method finishes, "region" should
// have the extent of the required input region. The default method assumes
// the required input extent are the same as the output extent.
// Note: The splitting methods call this method with outRegion = inRegion.
void vtkImageBlend::InternalComputeInputUpdateExtent(int inExt[6],
int outExt[6],
int wholeExtent[6])
{
memcpy(inExt,outExt,sizeof(int)*6);
int i;
// clip with the whole extent
for (i = 0; i < 3; i++)
{
if (inExt[2*i] < wholeExtent[2*i])
{
inExt[2*i] = wholeExtent[2*i];
}
if (inExt[2*i+1] > wholeExtent[2*i+1])
{
inExt[2*i+1] = wholeExtent[2*i+1];
}
}
}
//----------------------------------------------------------------------------
int vtkImageBlend::RequestUpdateExtent(
vtkInformation * vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation* outInfo = outputVector->GetInformationObject(0);
// default input extent will be that of output extent
int inExt[6];
int *outExt =
outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT());
int whichInput;
for (whichInput = 0; whichInput < this->GetNumberOfInputConnections(0);
whichInput++)
{
int *inWextent;
vtkInformation *inInfo = inputVector[0]->GetInformationObject(whichInput);
inWextent = inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
this->InternalComputeInputUpdateExtent(inExt, outExt, inWextent);
inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(),inExt,6);
}
return 1;
}
//----------------------------------------------------------------------------
int vtkImageBlend::RequestData(
vtkInformation* request,
vtkInformationVector** inputVector,
vtkInformationVector* outputVector)
{
// check to see if we have more than one input
if (this->GetNumberOfInputConnections(0) == 1)
{
vtkDebugMacro("RequestData: single input, passing data");
vtkInformation* info = outputVector->GetInformationObject(0);
vtkImageData *outData = static_cast<vtkImageData *>(
info->Get(vtkDataObject::DATA_OBJECT()));
info = inputVector[0]->GetInformationObject(0);
vtkImageData *inData =
static_cast<vtkImageData*>(info->Get(vtkDataObject::DATA_OBJECT()));
outData->SetExtent(inData->GetExtent());
outData->GetPointData()->PassData(inData->GetPointData());
this->DataWasPassed = 1;
}
else // multiple inputs
{
vtkInformation* info = outputVector->GetInformationObject(0);
vtkImageData *outData = static_cast<vtkImageData *>(
info->Get(vtkDataObject::DATA_OBJECT()));
if (this->DataWasPassed)
{
outData->GetPointData()->SetScalars(NULL);
this->DataWasPassed = 0;
}
return this->Superclass::RequestData(request,inputVector,outputVector);
}
return 1;
}
//----------------------------------------------------------------------------
// helper function for the stencil
template <class T>
inline int vtkBlendGetNextExtent(vtkImageStencilData *stencil,
int &r1, int &r2, int rmin, int rmax,
int yIdx, int zIdx,
T *&outPtr, T *&inPtr,
int outScalars, int inScalars,
int &iter)
{
// trivial case if stencil is not set
if (!stencil)
{
if (iter++ == 0)
{
r1 = rmin;
r2 = rmax;
return 1;
}
return 0;
}
// save r2
int oldr2 = r2;
if (iter == 0)
{ // if no 'last time', start just before rmin
oldr2 = rmin - 1;
}
int rval = stencil->GetNextExtent(r1, r2, rmin, rmax, yIdx, zIdx, iter);
int incr = r1 - oldr2 - 1;
if (rval == 0)
{
incr = rmax - oldr2;
}
outPtr += incr*outScalars;
inPtr += incr*inScalars;
return rval;
}
//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageBlendExecute(vtkImageBlend *self, int extent[6],
vtkImageData *inData, T *inPtr,
vtkImageData *outData, T *outPtr,
double opacity, int id)
{
int idxX, idxY, idxZ;
int minX = 0;
int maxX = 0;
int iter;
vtkIdType inIncX, inIncY, inIncZ;
vtkIdType outIncX, outIncY, outIncZ;
int inC, outC;
double minA, maxA;
double r, f;
unsigned long count = 0;
unsigned long target;
vtkImageStencilData *stencil = self->GetStencil();
if (inData->GetScalarType() == VTK_DOUBLE ||
inData->GetScalarType() == VTK_FLOAT)
{
minA = 0.0;
maxA = 1.0;
}
else
{
minA = inData->GetScalarTypeMin();
maxA = inData->GetScalarTypeMax();
}
r = opacity;
f = 1.0 - r;
opacity = opacity/(maxA-minA);
inC = inData->GetNumberOfScalarComponents();
outC = outData->GetNumberOfScalarComponents();
target = static_cast<unsigned long>((extent[3] - extent[2] + 1)*
(extent[5] - extent[4] + 1)/50.0);
target++;
// Get increments to march through data
inData->GetContinuousIncrements(extent, inIncX, inIncY, inIncZ);
outData->GetContinuousIncrements(extent, outIncX, outIncY, outIncZ);
// Loop through output pixels
for (idxZ = extent[4]; idxZ <= extent[5]; idxZ++)
{
for (idxY = extent[2]; !self->AbortExecute && idxY <= extent[3]; idxY++)
{
if (!id)
{
if (!(count%target))
{
self->UpdateProgress(count/(50.0*target));
}
count++;
}
iter = 0;
if (outC >= 3 && inC >= 4)
{ // RGB(A) blended with RGBA
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
r = opacity*(inPtr[3]-minA);
f = 1.0-r;
outPtr[0] = T(outPtr[0]*f + inPtr[0]*r);
outPtr[1] = T(outPtr[1]*f + inPtr[1]*r);
outPtr[2] = T(outPtr[2]*f + inPtr[2]*r);
outPtr += outC;
inPtr += inC;
}
}
}
else if (outC >= 3 && inC == 3)
{ // RGB(A) blended with RGB
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
outPtr[0] = T(outPtr[0]*f + inPtr[0]*r);
outPtr[1] = T(outPtr[1]*f + inPtr[1]*r);
outPtr[2] = T(outPtr[2]*f + inPtr[2]*r);
outPtr += outC;
inPtr += inC;
}
}
}
else if (outC >= 3 && inC == 2)
{ // RGB(A) blended with luminance+alpha
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
r = opacity*(inPtr[1]-minA);
f = 1.0-r;
outPtr[0] = T(outPtr[0]*f + (*inPtr)*r);
outPtr[1] = T(outPtr[1]*f + (*inPtr)*r);
outPtr[2] = T(outPtr[2]*f + (*inPtr)*r);
outPtr += outC;
inPtr += 2;
}
}
}
else if (outC >= 3 && inC == 1)
{ // RGB(A) blended with luminance
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
outPtr[0] = T(outPtr[0]*f + (*inPtr)*r);
outPtr[1] = T(outPtr[1]*f + (*inPtr)*r);
outPtr[2] = T(outPtr[2]*f + (*inPtr)*r);
outPtr += outC;
inPtr++;
}
}
}
else if (inC == 2)
{ // luminance(+alpha) blended with luminance+alpha
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
r = opacity*(inPtr[1]-minA);
f = 1.0-r;
*outPtr = T((*outPtr)*f + (*inPtr)*r);
outPtr += outC;
inPtr += 2;
}
}
}
else
{ // luminance(+alpha) blended with luminance
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
*outPtr = T((*outPtr)*f + (*inPtr)*r);
outPtr += outC;
inPtr++;
}
}
}
outPtr += outIncY;
inPtr += inIncY;
}
outPtr += outIncZ;
inPtr += inIncZ;
}
}
//----------------------------------------------------------------------------
// This templated function executes the filter specifically for char data
template <class T>
void vtkImageBlendExecuteChar(vtkImageBlend *self, int extent[6],
vtkImageData *inData, T *inPtr,
vtkImageData *outData, T *outPtr,
double opacity, int id)
{
int idxX, idxY, idxZ;
int minX = 0;
int maxX = 0;
int iter;
vtkIdType inIncX, inIncY, inIncZ;
vtkIdType outIncX, outIncY, outIncZ;
int inC, outC;
unsigned short r, f, o;
int v0, v1, v2;
unsigned long count = 0;
unsigned long target;
vtkImageStencilData *stencil = self->GetStencil();
// round opacity to a value in the range [0,256], because division
// by 256 can be efficiently achieved by bit-shifting by 8 bits
o = static_cast<unsigned short>(256*opacity + 0.5);
r = o;
f = 256 - o;
inC = inData->GetNumberOfScalarComponents();
outC = outData->GetNumberOfScalarComponents();
target = static_cast<unsigned long>((extent[3] - extent[2] + 1)*
(extent[5] - extent[4] + 1)/50.0);
target++;
// Get increments to march through data
inData->GetContinuousIncrements(extent, inIncX, inIncY, inIncZ);
outData->GetContinuousIncrements(extent, outIncX, outIncY, outIncZ);
// Loop through ouput pixels
for (idxZ = extent[4]; idxZ <= extent[5]; idxZ++)
{
for (idxY = extent[2]; !self->AbortExecute && idxY <= extent[3]; idxY++)
{
if (!id)
{
if (!(count%target))
{
self->UpdateProgress(count/(50.0*target));
}
count++;
}
iter = 0;
if (outC >= 3 && inC >= 4)
{ // RGB(A) blended with RGBA
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
// multiply to get a number in the range [0,65280]
// where 65280 = 255*256 = range of inPtr[3] * range of o
r = inPtr[3]*o;
f = 65280 - r;
v0 = outPtr[0]*f + inPtr[0]*r;
v1 = outPtr[1]*f + inPtr[1]*r;
v2 = outPtr[2]*f + inPtr[2]*r;
// do some math tricks to achieve division by 65280:
// this is not an approximation, it gives exactly the
// same result as an integer division by 65280
outPtr[0] = (v0 + (v0 >> 8) + (v0 >> 16) + 1) >> 16;
outPtr[1] = (v1 + (v1 >> 8) + (v1 >> 16) + 1) >> 16;
outPtr[2] = (v2 + (v2 >> 8) + (v2 >> 16) + 1) >> 16;
inPtr += inC;
outPtr += outC;
}
}
}
else if (outC >= 3 && inC == 3)
{ // RGB(A) blended with RGB
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
// the bit-shift achieves a division by 256
outPtr[0] = (outPtr[0]*f + inPtr[0]*r) >> 8;
outPtr[1] = (outPtr[1]*f + inPtr[1]*r) >> 8;
outPtr[2] = (outPtr[2]*f + inPtr[2]*r) >> 8;
inPtr += 3;
outPtr += outC;
}
}
}
else if (outC >= 3 && inC == 2)
{ // RGB(A) blended with luminance+alpha
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
// multiply to get a number in the range [0,65280]
// where 65280 = 255*256 = range of inPtr[1] * range of o
r = inPtr[1]*o;
f = 65280 - r;
v0 = outPtr[0]*f + inPtr[0]*r;
v1 = outPtr[1]*f + inPtr[0]*r;
v2 = outPtr[2]*f + inPtr[0]*r;
// do some math tricks to achieve division by 65280:
// this is not an approximation, it gives exactly the
// same result as an integer division by 65280
outPtr[0] = (v0 + (v0 >> 8) + (v0 >> 16) + 1) >> 16;
outPtr[1] = (v1 + (v1 >> 8) + (v1 >> 16) + 1) >> 16;
outPtr[2] = (v2 + (v2 >> 8) + (v2 >> 16) + 1) >> 16;
inPtr += 2;
outPtr += outC;
}
}
}
else if (outC >= 3 && inC == 1)
{ // RGB(A) blended with luminance
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
// the bit-shift achieves a division by 256
outPtr[0] = (outPtr[0]*f + inPtr[0]*r) >> 8;
outPtr[1] = (outPtr[1]*f + inPtr[0]*r) >> 8;
outPtr[2] = (outPtr[2]*f + inPtr[0]*r) >> 8;
inPtr++;
outPtr += outC;
}
}
}
else if (inC == 2)
{ // luminance(+alpha) blended with luminance+alpha
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
// multiply to get a number in the range [0,65280]
// where 65280 = 255*256 = range of inPtr[1] * range of o
r = inPtr[1]*o;
f = 65280 - r;
v0 = outPtr[0]*f + inPtr[0]*r;
// do some math tricks to achieve division by 65280:
// this is not an approximation, it gives exactly the
// same result as an integer division by 65280
outPtr[0] = (v0 + (v0 >> 8) + (v0 >> 16) + 1) >> 16;
inPtr += 2;
outPtr += outC;
}
}
}
else
{ // luminance(+alpha) blended with luminance
while (vtkBlendGetNextExtent(stencil, minX, maxX, extent[0], extent[1],
idxY, idxZ,
outPtr, inPtr, outC, inC, iter))
{
for (idxX = minX; idxX <= maxX; idxX++)
{
// the bit-shift achieves a division by 256
outPtr[0] = (outPtr[0]*f + inPtr[0]*r) >> 8;
inPtr++;
outPtr += outC;
}
}
}
outPtr += outIncY;
inPtr += inIncY;
}
outPtr += outIncZ;
inPtr += inIncZ;
}
}
//----------------------------------------------------------------------------
// This function simply does a copy (for the first input)
//----------------------------------------------------------------------------
void vtkImageBlendCopyData(vtkImageData *inData, vtkImageData *outData,
int *ext)
{
int idxY, idxZ, maxY, maxZ;
vtkIdType inIncX, inIncY, inIncZ;
int rowLength;
unsigned char *inPtr, *inPtr1, *outPtr;
inPtr = static_cast<unsigned char *>(inData->GetScalarPointerForExtent(ext));
outPtr =
static_cast<unsigned char *>(outData->GetScalarPointerForExtent(ext));
// Get increments to march through inData
inData->GetIncrements(inIncX, inIncY, inIncZ);
// find the region to loop over
rowLength = (ext[1] - ext[0]+1)*inIncX*inData->GetScalarSize();
maxY = ext[3] - ext[2];
maxZ = ext[5] - ext[4];
inIncY *= inData->GetScalarSize();
inIncZ *= inData->GetScalarSize();
// Loop through outData pixels
for (idxZ = 0; idxZ <= maxZ; idxZ++)
{
inPtr1 = inPtr + idxZ*inIncZ;
for (idxY = 0; idxY <= maxY; idxY++)
{
memcpy(outPtr,inPtr1,rowLength);
inPtr1 += inIncY;
outPtr += rowLength;
}
}
}
//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageBlendCompoundExecute(vtkImageBlend *self,
int extent[6],
vtkImageData *inData,
T *inPtr,
vtkImageData *tmpData,
double opacity,
double threshold)
{
unsigned long count = 0;
unsigned long target;
target = static_cast<unsigned long>((extent[3] - extent[2] + 1)*
(extent[5] - extent[4] + 1)/50.0);
target++;
// Get increments to march through data
vtkIdType inIncX, inIncY, inIncZ;
int inC;
inData->GetContinuousIncrements(extent, inIncX, inIncY, inIncZ);
inC = inData->GetNumberOfScalarComponents();
vtkIdType tmpIncX, tmpIncY, tmpIncZ;
int tmpC;
tmpData->GetContinuousIncrements(extent, tmpIncX, tmpIncY, tmpIncZ);
tmpC = tmpData->GetNumberOfScalarComponents();
double* tmpPtr = static_cast<double *>(tmpData->GetScalarPointerForExtent(extent));
// Opacity
double minA, maxA;
double r;
if (inData->GetScalarType() == VTK_DOUBLE ||
inData->GetScalarType() == VTK_FLOAT)
{
minA = 0.0;
maxA = 1.0;
}
else
{
minA = static_cast<double>(inData->GetScalarTypeMin());
maxA = static_cast<double>(inData->GetScalarTypeMax());
}
r = opacity;
opacity = opacity/(maxA-minA);
if ((inC == 3 || inC == 1) && r <= threshold)
{
return;
}
// Loop through output pixels
for (int idxZ = extent[4]; idxZ <= extent[5]; idxZ++)
{
for (int idxY = extent[2]; !self->AbortExecute && idxY<=extent[3]; idxY++)
{
if (!(count%target))
{
self->UpdateProgress(count/(50.0*target));
}
count++;
if (tmpC >= 3)
{
// RGB(A) blended with RGBA
if (inC >= 4)
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
r = opacity * (static_cast<double>(inPtr[3]) - minA);
if (r > threshold)
{
tmpPtr[0] += static_cast<double>(inPtr[0]) * r;
tmpPtr[1] += static_cast<double>(inPtr[1]) * r;
tmpPtr[2] += static_cast<double>(inPtr[2]) * r;
tmpPtr[3] += r;
}
tmpPtr += 4;
inPtr += inC;
}
}
// RGB(A) blended with RGB
else if (inC == 3)
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
tmpPtr[0] += static_cast<double>(inPtr[0]) * r;
tmpPtr[1] += static_cast<double>(inPtr[1]) * r;
tmpPtr[2] += static_cast<double>(inPtr[2]) * r;
tmpPtr[3] += r;
tmpPtr += 4;
inPtr += inC;
}
}
// RGB(A) blended with luminance+alpha
else if (inC == 2)
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
r = opacity * (static_cast<double>(inPtr[1]) - minA);
if (r > threshold)
{
tmpPtr[0] += static_cast<double>(*inPtr) * r;
tmpPtr[1] += static_cast<double>(*inPtr) * r;
tmpPtr[2] += static_cast<double>(*inPtr) * r;
tmpPtr[3] += r;
}
tmpPtr += 4;
inPtr += 2;
}
}
// RGB(A) blended with luminance
else if (inC == 1)
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
tmpPtr[0] += static_cast<double>(*inPtr) * r;
tmpPtr[1] += static_cast<double>(*inPtr) * r;
tmpPtr[2] += static_cast<double>(*inPtr) * r;
tmpPtr[3] += r;
tmpPtr += 4;
inPtr++;
}
}
}
// luminance(+alpha) blended with luminance+alpha
else if (inC == 2)
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
r = opacity * (static_cast<double>(inPtr[1]) - minA);
if (r > threshold)
{
tmpPtr[0] = static_cast<double>(*inPtr) * r;
tmpPtr[1] += r;
}
tmpPtr += 2;
inPtr += 2;
}
}
// luminance(+alpha) blended with luminance
else
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
tmpPtr[0] = static_cast<double>(*inPtr) * r;
tmpPtr[1] += r;
tmpPtr += 2;
inPtr++;
}
}
tmpPtr += tmpIncY;
inPtr += inIncY;
}
tmpPtr += tmpIncZ;
inPtr += inIncZ;
}
}
//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageBlendCompoundTransferExecute(vtkImageBlend *self,
int extent[6],
vtkImageData *outData,
T *outPtr,
vtkImageData *tmpData)
{
// Get increments to march through data
vtkIdType outIncX, outIncY, outIncZ;
int outC;
outData->GetContinuousIncrements(extent, outIncX, outIncY, outIncZ);
outC = outData->GetNumberOfScalarComponents();
vtkIdType tmpIncX, tmpIncY, tmpIncZ;
int tmpC;
tmpData->GetContinuousIncrements(extent, tmpIncX, tmpIncY, tmpIncZ);
tmpC = tmpData->GetNumberOfScalarComponents();
double* tmpPtr = static_cast<double *>(
tmpData->GetScalarPointerForExtent(extent));
// Loop through output pixels
for (int idxZ = extent[4]; idxZ <= extent[5]; idxZ++)
{
for (int idxY = extent[2]; !self->AbortExecute && idxY<=extent[3]; idxY++)
{
if (tmpC >= 3)
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
double factor = 0.0;
if (tmpPtr[3] != 0)
{
factor = 1.0/tmpPtr[3];
}
outPtr[0] = T(tmpPtr[0]*factor);
outPtr[1] = T(tmpPtr[1]*factor);
outPtr[2] = T(tmpPtr[2]*factor);
tmpPtr += 4;
outPtr += outC;
}
}
else
{
for (int idxX = extent[0]; idxX <= extent[1]; idxX++)
{
double factor = 0.0;
if (tmpPtr[1] != 0)
{
factor = 1.0/tmpPtr[1];
}
outPtr[0] = T(tmpPtr[0]*factor);
tmpPtr += 2;
outPtr += outC;
}
}
tmpPtr += tmpIncY;
outPtr += outIncY;
}
tmpPtr += tmpIncZ;
outPtr += outIncZ;
}
}
//----------------------------------------------------------------------------
// This method is passed a input and output regions, and executes the filter
// algorithm to fill the output from the inputs.
// It just executes a switch statement to call the correct function for
// the regions data types.
void vtkImageBlend::ThreadedRequestData (
vtkInformation * vtkNotUsed( request ),
vtkInformationVector** inputVector,
vtkInformationVector * vtkNotUsed( outputVector ),
vtkImageData ***inData,
vtkImageData **outData,
int outExt[6], int id)
{
int extent[6];
void *inPtr;
void *outPtr;
double opacity;
vtkImageData *tmpData = NULL;
// check
if (inData[0][0]->GetNumberOfScalarComponents() > 4)
{
vtkErrorMacro("The first input can have a maximum of four components");
return;
}
// init
switch (this->BlendMode)
{