IECore::ConstFloatVectorDataPtr Shape::computeChannelData( const std::string &channelName, const Imath::V2i &tileOrigin, const Gaffer::Context *context, const ImagePlug *parent ) const
{
assert( parent == shapePlug() );
if( channelName == g_shapeChannelName )
{
// Private channel we use for caching the shape but don't advertise via channelNames.
return computeShapeChannelData( tileOrigin, context );
}
else
{
ConstFloatVectorDataPtr shape = parent->channelData( g_shapeChannelName, context->get<V2i>( ImagePlug::tileOriginContextName ) );
const float c = channelValue( parent, channelName );
if( c == 1 )
{
return shape;
}
else
{
FloatVectorDataPtr resultData = shape->copy();
vector<float> &result = resultData->writable();
for( vector<float>::iterator it = result.begin(), eIt = result.end(); it != eIt; ++it )
{
*it *= c;
}
return resultData;
}
}
}
void operator()( const blocked_range2d<size_t>& r ) const
{
ContextPtr context = new Context( *m_parentContext );
const Box2i operationWindow( V2i( r.rows().begin()+m_dataWindow.min.x, r.cols().begin()+m_dataWindow.min.y ), V2i( r.rows().end()+m_dataWindow.min.x-1, r.cols().end()+m_dataWindow.min.y-1 ) );
V2i minTileOrigin = ImagePlug::tileOrigin( operationWindow.min );
V2i maxTileOrigin = ImagePlug::tileOrigin( operationWindow.max );
size_t imageStride = m_dataWindow.size().x + 1;
for( int tileOriginY = minTileOrigin.y; tileOriginY <= maxTileOrigin.y; tileOriginY += m_tileSize )
{
for( int tileOriginX = minTileOrigin.x; tileOriginX <= maxTileOrigin.x; tileOriginX += m_tileSize )
{
for( vector<string>::const_iterator it = m_channelNames.begin(), eIt = m_channelNames.end(); it != eIt; it++ )
{
context->set( ImagePlug::channelNameContextName, *it );
context->set( ImagePlug::tileOriginContextName, V2i( tileOriginX, tileOriginY ) );
Context::Scope scope( context.get() );
Box2i tileBound( V2i( tileOriginX, tileOriginY ), V2i( tileOriginX + m_tileSize - 1, tileOriginY + m_tileSize - 1 ) );
Box2i b = boxIntersection( tileBound, operationWindow );
ConstFloatVectorDataPtr tileData = m_channelDataPlug->getValue();
for( int y = b.min.y; y<=b.max.y; y++ )
{
const float *tilePtr = &(tileData->readable()[0]) + (y - tileOriginY) * m_tileSize + (b.min.x - tileOriginX);
float *channelPtr = m_imageChannelData[it-m_channelNames.begin()] + ( m_dataWindow.size().y - ( y - m_dataWindow.min.y ) ) * imageStride + (b.min.x - m_dataWindow.min.x);
for( int x = b.min.x; x <= b.max.x; x++ )
{
*channelPtr++ = *tilePtr++;
}
}
}
}
}
}
Engine( const Box2i &displayWindow, const Box2i &tileBound, const Box2i &validTileBound, ConstFloatVectorDataPtr uData, ConstFloatVectorDataPtr vData, ConstFloatVectorDataPtr aData )
: m_displayWindow( displayWindow ),
m_tileBound( tileBound ),
m_uData( uData ),
m_vData( vData ),
m_aData( aData ),
m_u( uData->readable() ),
m_v( vData->readable() ),
m_a( aData->readable() )
{
V2i oP;
for( oP.y = validTileBound.min.y; oP.y < validTileBound.max.y; ++oP.y )
{
size_t i = index( V2i( validTileBound.min.x, oP.y ), tileBound );
for( oP.x = validTileBound.min.x; oP.x < validTileBound.max.x; ++oP.x, ++i )
{
if( m_a[i] == 0.0f )
{
continue;
}
const V2f iP = uvToPixel( V2f( m_u[i], m_v[i] ) );
m_inputWindow.extendBy( iP );
}
}
m_inputWindow.min -= V2i( 1 );
m_inputWindow.max += V2i( 1 );
}
Engine( const Box2i &displayWindow, const Box2i &tileBound, const Box2i &validTileBound, ConstFloatVectorDataPtr xData, ConstFloatVectorDataPtr yData, ConstFloatVectorDataPtr aData, VectorMode vectorMode, VectorUnits vectorUnits )
: m_displayWindow( displayWindow ),
m_tileBound( tileBound ),
m_xData( xData ),
m_yData( yData ),
m_aData( aData ),
m_x( xData->readable() ),
m_y( yData->readable() ),
m_a( aData->readable() ),
m_vectorMode( vectorMode ),
m_vectorUnits( vectorUnits )
{
}
virtual void imageData( const Imath::Box2i &box, const float *data, size_t dataSize )
{
Box2i yUpBox = m_gafferFormat.yDownToFormatSpace( box );
const V2i boxMinTileOrigin = ImagePlug::tileOrigin( yUpBox.min );
const V2i boxMaxTileOrigin = ImagePlug::tileOrigin( yUpBox.max );
for( int tileOriginY = boxMinTileOrigin.y; tileOriginY <= boxMaxTileOrigin.y; tileOriginY += ImagePlug::tileSize() )
{
for( int tileOriginX = boxMinTileOrigin.x; tileOriginX <= boxMaxTileOrigin.x; tileOriginX += ImagePlug::tileSize() )
{
for( int channelIndex = 0, numChannels = channelNames().size(); channelIndex < numChannels; ++channelIndex )
{
const V2i tileOrigin( tileOriginX, tileOriginY );
ConstFloatVectorDataPtr tileData = getTile( tileOrigin, channelIndex );
if( !tileData )
{
// we've been sent data outside of the data window
continue;
}
// we must create a new object to hold the updated tile data,
// because the old one might well have been returned from
// computeChannelData and be being held in the cache.
FloatVectorDataPtr updatedTileData = tileData->copy();
vector<float> &updatedTile = updatedTileData->writable();
const Box2i tileBound( tileOrigin, tileOrigin + Imath::V2i( GafferImage::ImagePlug::tileSize() - 1 ) );
const Box2i transferBound = IECore::boxIntersection( tileBound, yUpBox );
for( int y = transferBound.min.y; y<=transferBound.max.y; ++y )
{
int srcY = m_gafferFormat.formatToYDownSpace( y );
size_t srcIndex = ( ( srcY - box.min.y ) * ( box.size().x + 1 ) * numChannels ) + ( transferBound.min.x - box.min.x ) + channelIndex;
size_t dstIndex = ( y - tileBound.min.y ) * ImagePlug::tileSize() + transferBound.min.x - tileBound.min.x;
const size_t srcEndIndex = srcIndex + transferBound.size().x * numChannels;
while( srcIndex <= srcEndIndex )
{
updatedTile[dstIndex] = data[srcIndex];
srcIndex += numChannels;
dstIndex++;
}
}
setTile( tileOrigin, channelIndex, updatedTileData );
}
}
}
dataReceivedSignal()( this, box );
}
IECore::ConstFloatVectorDataPtr CopyChannels::computeChannelData( const std::string &channelName, const Imath::V2i &tileOrigin, const Gaffer::Context *context, const ImagePlug *parent ) const
{
ConstCompoundObjectPtr mapping;
{
ImagePlug::GlobalScope c( context );
mapping = mappingPlug()->getValue();
}
if( const IntData *i = mapping->member<const IntData>( channelName ) )
{
const ImagePlug *inputImage = inPlugs()->getChild<ImagePlug>( i->readable() );
const V2i tileOrigin = context->get<V2i>( ImagePlug::tileOriginContextName );
const Box2i tileBound( tileOrigin, tileOrigin + V2i( ImagePlug::tileSize() ) );
Box2i inputDataWindow;
{
ImagePlug::GlobalScope c( context );
inputDataWindow = inputImage->dataWindowPlug()->getValue();
}
const Box2i validBound = BufferAlgo::intersection( tileBound, inputDataWindow );
if( validBound == tileBound )
{
return inputImage->channelDataPlug()->getValue();
}
else
{
FloatVectorDataPtr resultData = new FloatVectorData;
vector<float> &result = resultData->writable();
result.resize( ImagePlug::tileSize() * ImagePlug::tileSize(), 0.0f );
if( !BufferAlgo::empty( validBound ) )
{
ConstFloatVectorDataPtr inputData = inputImage->channelDataPlug()->getValue();
copyRegion(
&inputData->readable().front(),
tileBound,
validBound,
&result.front(),
tileBound,
validBound.min
);
}
return resultData;
}
}
else
{
return ImagePlug::blackTile();
}
}
void ToArnoldShapeConverter::convertRadius( const IECore::Primitive *primitive, AtNode *shape ) const
{
ConstFloatVectorDataPtr radius = primitive->variableData<FloatVectorData>( "radius" );
if( !radius )
{
FloatVectorDataPtr calculatedRadius = new FloatVectorData();
if( const FloatData *constantRadius = primitive->variableData<FloatData>( "radius", PrimitiveVariable::Constant ) )
{
calculatedRadius->writable().push_back( constantRadius->readable() );
}
else if( const FloatVectorData *width = primitive->variableData<FloatVectorData>( "width" ) )
{
calculatedRadius->writable().resize( width->readable().size() );
const std::vector<float>::iterator end = calculatedRadius->writable().end();
std::vector<float>::const_iterator wIt = width->readable().begin();
for( std::vector<float>::iterator it = calculatedRadius->writable().begin(); it != end; it++, wIt++ )
{
*it = *wIt / 2.0f;
}
}
else
{
const FloatData *constantWidth = primitive->variableData<FloatData>( "width", PrimitiveVariable::Constant );
if( !constantWidth )
{
constantWidth = primitive->variableData<FloatData>( "constantwidth", PrimitiveVariable::Constant );
}
float r = constantWidth ? constantWidth->readable() / 2.0f : 0.5f;
calculatedRadius->writable().push_back( r );
}
radius = calculatedRadius;
}
AiNodeSetArray(
shape,
"radius",
AiArrayConvert( radius->readable().size(), 1, AI_TYPE_FLOAT, (void *)&( radius->readable()[0] ) )
);
}
void Unpremultiply::processChannelData( const Gaffer::Context *context, const ImagePlug *parent, const std::string &channel, FloatVectorDataPtr outData ) const
{
std::string alphaChannel = alphaChannelPlug()->getValue();
if ( channel == alphaChannel )
{
return;
}
ConstStringVectorDataPtr inChannelNamesPtr;
{
ImagePlug::GlobalScope c( context );
inChannelNamesPtr = inPlug()->channelNamesPlug()->getValue();
}
const std::vector<std::string> &inChannelNames = inChannelNamesPtr->readable();
if ( std::find( inChannelNames.begin(), inChannelNames.end(), alphaChannel ) == inChannelNames.end() )
{
std::ostringstream channelError;
channelError << "Channel '" << alphaChannel << "' does not exist";
throw( IECore::Exception( channelError.str() ) );
}
ImagePlug::ChannelDataScope channelDataScope( context );
channelDataScope.setChannelName( alphaChannel );
ConstFloatVectorDataPtr aData = inPlug()->channelDataPlug()->getValue();
const std::vector<float> &a = aData->readable();
std::vector<float> &out = outData->writable();
std::vector<float>::const_iterator aIt = a.begin();
for ( std::vector<float>::iterator outIt = out.begin(), outItEnd = out.end(); outIt != outItEnd; ++outIt, ++aIt )
{
if ( *aIt != 0.0f )
{
*outIt /= *aIt;
}
}
}
void operator()( const blocked_range3d<size_t>& r ) const
{
ContextPtr context = new Context( *m_parentContext, Context::Borrowed );
Context::Scope scope( context.get() );
const Box2i operationWindow( V2i( r.rows().begin()+m_dataWindow.min.x, r.cols().begin()+m_dataWindow.min.y ), V2i( r.rows().end()+m_dataWindow.min.x-1, r.cols().end()+m_dataWindow.min.y-1 ) );
V2i minTileOrigin = ImagePlug::tileOrigin( operationWindow.min );
V2i maxTileOrigin = ImagePlug::tileOrigin( operationWindow.max );
size_t imageStride = m_dataWindow.size().x + 1;
for( size_t channelIndex = r.pages().begin(); channelIndex < r.pages().end(); ++channelIndex )
{
context->set( ImagePlug::channelNameContextName, m_channelNames[channelIndex] );
float *channelBegin = m_imageChannelData[channelIndex];
for( int tileOriginY = minTileOrigin.y; tileOriginY <= maxTileOrigin.y; tileOriginY += m_tileSize )
{
for( int tileOriginX = minTileOrigin.x; tileOriginX <= maxTileOrigin.x; tileOriginX += m_tileSize )
{
context->set( ImagePlug::tileOriginContextName, V2i( tileOriginX, tileOriginY ) );
Box2i tileBound( V2i( tileOriginX, tileOriginY ), V2i( tileOriginX + m_tileSize - 1, tileOriginY + m_tileSize - 1 ) );
Box2i b = boxIntersection( tileBound, operationWindow );
size_t tileStrideSize = sizeof(float) * ( b.size().x + 1 );
ConstFloatVectorDataPtr tileData = m_channelDataPlug->getValue();
const float *tileDataBegin = &(tileData->readable()[0]);
for( int y = b.min.y; y<=b.max.y; y++ )
{
const float *tilePtr = tileDataBegin + (y - tileOriginY) * m_tileSize + (b.min.x - tileOriginX);
float *channelPtr = channelBegin + ( m_dataWindow.size().y - ( y - m_dataWindow.min.y ) ) * imageStride + (b.min.x - m_dataWindow.min.x);
std::memcpy( channelPtr, tilePtr, tileStrideSize );
}
}
}
}
}
SmoothSkinningData::SmoothSkinningData( ConstStringVectorDataPtr influenceNames,
ConstM44fVectorDataPtr influencePose,
ConstIntVectorDataPtr pointIndexOffsets,
ConstIntVectorDataPtr pointInfluenceCounts,
ConstIntVectorDataPtr pointInfluenceIndices,
ConstFloatVectorDataPtr pointInfluenceWeights)
{
assert( influenceNames );
assert( influencePose );
assert( pointIndexOffsets );
assert( pointInfluenceCounts );
assert( pointInfluenceIndices );
assert( pointInfluenceWeights );
m_influenceNames = influenceNames->copy();
m_influencePose = influencePose->copy();
m_pointIndexOffsets = pointIndexOffsets->copy();
m_pointInfluenceCounts = pointInfluenceCounts->copy();
m_pointInfluenceIndices = pointInfluenceIndices->copy();
m_pointInfluenceWeights = pointInfluenceWeights->copy();
}
SimpleSubsurface::SimpleSubsurface( ConstV3fVectorDataPtr p, ConstColor3fVectorDataPtr c, ConstFloatVectorDataPtr a, const SplinefColor3f &falloff )
{
m_privateData = boost::shared_ptr<PrivateData>( new PrivateData );
m_privateData->points = p->copy();
m_privateData->colors = c->copy();
const vector<float> &areas = a->readable();
vector<Color3f> &colors = m_privateData->colors->writable();
for( size_t i=0; i<colors.size(); i++ )
{
colors[i] *= areas[i];
}
m_privateData->tree.init( m_privateData->points->readable().begin(), m_privateData->points->readable().end() );
m_privateData->falloff.init( SplineRemapper( falloff ), 0, 1, 100 );
m_privateData->nodeCentroids.resize( m_privateData->tree.numNodes() );
m_privateData->nodeColors.resize( m_privateData->tree.numNodes() );
m_privateData->nodeBounds.resize( m_privateData->tree.numNodes() );
buildWalk( m_privateData->tree.rootIndex() );
}
ObjectPtr EnvMapSHProjector::doOperation( const CompoundObject *operands )
{
ImagePrimitive * image = runTimeCast< ImagePrimitive, Object >( m_envMapParameter->getValue() );
if ( image->getDisplayWindow() != image->getDataWindow() )
{
throw Exception( "EnvMapSHProjector only works with images that display and data windows match." );
}
unsigned bands = m_bandsParameter->getNumericValue();
unsigned samples = m_samplesParameter->getNumericValue();
bool rightHandSystem = m_rightHandSystemParameter->getTypedValue();
bool applyFilter = m_applyFilterParameter->getTypedValue();
Imath::M44f orientation = m_orientationParameter->getTypedValue();
int imgWidth = image->getDataWindow().size().x + 1;
int imgHeight = image->getDataWindow().size().y + 1;
// create SH projector
IECore::SHProjectorf projector( samples );
projector.computeSamples( bands );
ConstFloatVectorDataPtr redData = image->getChannel< float >( "R" );
ConstFloatVectorDataPtr greenData = image->getChannel< float >( "G" );
ConstFloatVectorDataPtr blueData = image->getChannel< float >( "B" );
if ( !redData || !greenData || !blueData )
{
throw Exception( "EnvMap does not have the three colour channels (R,G,B)!" );
}
const std::vector<float> &chR = redData->readable();
const std::vector<float> &chG = greenData->readable();
const std::vector<float> &chB = blueData->readable();
// rotate coordinates along X axis so that the image maps Y coordinates to the vertical direction instead of Z.
Imath::M44f rotX90 = Imath::Eulerf( M_PI * 0.5, 0, 0 ).toMatrix44();
// \todo: check if the order of multiplication is what we expect...
orientation = orientation * rotX90;
EuclideanToSphericalTransform< Imath::V3f, Imath::V2f > euc2sph;
std::vector< Imath::V3f >::const_iterator cit = projector.euclideanCoordinates().begin();
SHColor3f sh( bands );
unsigned int i;
unsigned actualSamples = projector.euclideanCoordinates().size();
Imath::V3f systemConversion(1);
if ( !rightHandSystem )
{
systemConversion[2] = -systemConversion[2];
}
// image to SH
for ( i = 0; i < actualSamples; i++, cit++ )
{
Imath::V2f phiTheta = euc2sph.transform( ((*cit) * systemConversion) * orientation );
int ix = (int)(phiTheta.x * (float)imgWidth / ( M_PI * 2 ));
int iy = (int)(phiTheta.y * (float)imgHeight / M_PI );
if ( ix > imgWidth )
ix = imgWidth;
if ( iy > imgHeight )
iy = imgHeight;
int offset = iy * imgWidth + ix;
projector( i, Imath::Color3f( chR[ offset ], chG[ offset ], chB[ offset ] ), sh );
}
// filter SH
if ( applyFilter )
{
// use author's suggestion for window size.
IECore::windowingFilter( sh, 2*sh.bands() );
}
Color3fVectorDataPtr result = new Color3fVectorData( sh.coefficients() );
return result;
}
PatchMeshPrimitivePtr CurveExtrudeOp::buildPatchMesh( const CurvesPrimitive * curves, unsigned curveIndex, unsigned vertexOffset, unsigned varyingOffset ) const
{
if ( curves->periodic() )
{
throw InvalidArgumentException( "CurveExtrudeOp: Cannot convert periodic curves" );
}
PrimitiveVariableMap::const_iterator it = curves->variables.find( "P" );
if ( it == curves->variables.end() )
{
throw InvalidArgumentException( "CurveExtrudeOp: Input curve has no 'P' primvar" );
}
ConstV3fVectorDataPtr pData = runTimeCast< const V3fVectorData >( it->second.data );
if ( !pData )
{
throw InvalidArgumentException( "CurveExtrudeOp: Input curve has no 'P' primvar of type V3fVectorData" );
}
float width = 1.0f;
it = curves->variables.find( "constantwidth" );
if ( it != curves->variables.end() )
{
ConstFloatDataPtr widthData = 0;
if ( it->second.interpolation == PrimitiveVariable::Constant )
{
widthData = runTimeCast< const FloatData >( it->second.data );
}
if ( widthData )
{
width = widthData->readable();
}
else
{
msg( Msg::Warning, "CurveExtrudeOp", "Ignoring malformed primvar 'constantwidth'" );
}
}
ConstFloatVectorDataPtr varyingWidthData = 0;
ConstFloatVectorDataPtr vertexWidthData = 0;
it = curves->variables.find( "width" );
if ( it != curves->variables.end() )
{
if ( it->second.interpolation == PrimitiveVariable::Varying )
{
varyingWidthData = runTimeCast< const FloatVectorData >( it->second.data );
}
else if ( it->second.interpolation == PrimitiveVariable::Vertex )
{
vertexWidthData = runTimeCast< const FloatVectorData >( it->second.data );
}
if ( !varyingWidthData && !vertexWidthData)
{
msg( Msg::Warning, "CurveExtrudeOp", "Ignoring malformed primvar 'width'" );
}
}
const V2i &resolution = m_resolutionParameter->getTypedValue();
const unsigned int vPoints = resolution.y;
const unsigned int uPoints = resolution.x;
PatchMeshPrimitivePtr patchMesh = new PatchMeshPrimitive(
uPoints,
vPoints + 2, // End points are duplicated
CubicBasisf::catmullRom(),
CubicBasisf::catmullRom(),
true,
false
);
for ( PrimitiveVariableMap::const_iterator it = curves->variables.begin(); it != curves->variables.end(); ++it )
{
if ( it->second.interpolation == PrimitiveVariable::FaceVarying || it->second.interpolation == PrimitiveVariable::Varying )
{
VaryingFn varyingFn( it->first, curves, curveIndex, varyingOffset, resolution );
assert( it->second.data );
patchMesh->variables[ it->first ] = PrimitiveVariable(
it->second.interpolation,
despatchTypedData<VaryingFn, TypeTraits::IsStrictlyInterpolableVectorTypedData>( it->second.data, varyingFn )
);
}
else if ( it->second.interpolation == PrimitiveVariable::Vertex )
{
VertexFn vertexFn( it->first, curves, curveIndex, vertexOffset, resolution );
assert( it->second.data );
patchMesh->variables[ it->first ] = PrimitiveVariable(
it->second.interpolation,
despatchTypedData<VertexFn, TypeTraits::IsStrictlyInterpolableVectorTypedData>( it->second.data, vertexFn )
);
}
else if ( it->second.interpolation == PrimitiveVariable::Constant )
{
patchMesh->variables[ it->first ] = PrimitiveVariable( it->second.interpolation, it->second.data->copy() );
}
else if ( it->second.interpolation == PrimitiveVariable::Uniform )
{
UniformFn uniformFn( it->first, curves, curveIndex );
patchMesh->variables[ it->first ] = PrimitiveVariable(
PrimitiveVariable::Constant,
despatchTypedData<UniformFn, TypeTraits::IsVectorTypedData>( it->second.data, uniformFn )
);
}
}
if ( varyingWidthData )
{
assert( !vertexWidthData );
PrimitiveVariableMap::const_iterator it = patchMesh->variables.find( "width" );
assert( it != patchMesh->variables.end() );
varyingWidthData = runTimeCast< const FloatVectorData >( it->second.data );
assert( varyingWidthData );
}
else if ( vertexWidthData )
{
PrimitiveVariableMap::const_iterator it = patchMesh->variables.find( "width" );
assert( it != patchMesh->variables.end() );
vertexWidthData = runTimeCast< const FloatVectorData >( it->second.data );
assert( vertexWidthData );
}
const V3fVectorData::ValueType &p = pData->readable();
V3fVectorData::ValueType resampledPoints;
resampledPoints.reserve( vPoints );
V3fVectorData::ValueType resampledTangents;
resampledPoints.reserve( vPoints );
/// \todo Make adaptive
for ( unsigned v = 0; v < vPoints; v ++)
{
size_t iSeg;
float fSeg;
/// Make sure we don't fall off the end of the curve
if ( v == vPoints - 1 )
{
iSeg = curves->numSegments( curveIndex ) - 1;
fSeg = 1.0f - std::numeric_limits<float>::epsilon();
}
else
{
float curveParam = float(v) / ( vPoints - 1 );
fSeg = curveParam * curves->numSegments( curveIndex );
iSeg = (size_t)floor( fSeg );
fSeg = fSeg - iSeg;
}
size_t segmentStart = iSeg;
size_t i0 = std::min( segmentStart + 0, curves->variableSize( PrimitiveVariable::Vertex, curveIndex ) );
size_t i1 = std::min( segmentStart + 1, curves->variableSize( PrimitiveVariable::Vertex, curveIndex ) );
size_t i2 = std::min( segmentStart + 2, curves->variableSize( PrimitiveVariable::Vertex, curveIndex ) );
size_t i3 = std::min( segmentStart + 3, curves->variableSize( PrimitiveVariable::Vertex, curveIndex ) );
const Imath::V3f &p0 = p[ vertexOffset + i0 ];
const Imath::V3f &p1 = p[ vertexOffset + i1 ];
const Imath::V3f &p2 = p[ vertexOffset + i2 ];
const Imath::V3f &p3 = p[ vertexOffset + i3 ];
Imath::V3f pt = curves->basis()(
fSeg,
p0, p1, p2, p3
);
resampledPoints.push_back( pt );
resampledTangents.push_back(
curves->basis().derivative(
fSeg,
p0, p1, p2, p3
).normalized()
);
}
assert( resampledPoints.size() == vPoints );
assert( resampledTangents.size() == vPoints );
std::vector< M44f > frames;
buildReferenceFrames( resampledPoints, resampledTangents, frames );
assert( frames.size() == vPoints );
std::vector< V3f > patchP;
patchP.reserve( uPoints * ( vPoints + 2 ) );
for ( unsigned int v = 0; v < vPoints; v++ )
{
if ( varyingWidthData )
{
assert( !vertexWidthData );
assert( v * uPoints < varyingWidthData->readable().size() );
width = varyingWidthData->readable()[v * uPoints];
}
else if ( vertexWidthData )
{
assert( (v+1) * uPoints < vertexWidthData->readable().size() );
width = vertexWidthData->readable()[(v+1) * uPoints];
}
const float radius = width / 2.0f;
/// Double up end points
const int num = v == 0 || v == vPoints - 1 ? 2 : 1;
for ( int x = 0; x < num; x++)
{
for( unsigned int u = 0; u < uPoints; u++ )
{
/// We're periodic in 'u', so no need to close the curve.
/// Go from -PI to PI, in order to make the periodicity work, and to give the
/// surface the correct orientation.
float theta = -2.0 * M_PI * float(u) / float(uPoints) - M_PI;
V3f circlePoint(
0.0,
radius * cos( theta ),
radius * sin( theta )
);
circlePoint = circlePoint * frames[v];
patchP.push_back( circlePoint );
}
}
}
patchMesh->variables["P"] = PrimitiveVariable( PrimitiveVariable::Vertex, new V3fVectorData( patchP ) );
assert( patchMesh->arePrimitiveVariablesValid() );
return patchMesh;
}
ObjectPtr EnvMapSampler::doOperation( const CompoundObject * operands )
{
ImagePrimitivePtr image = static_cast<ImagePrimitive *>( imageParameter()->getValue() )->copy();
Box2i dataWindow = image->getDataWindow();
// find the rgb channels
ConstFloatVectorDataPtr redData = image->getChannel<float>( "R" );
ConstFloatVectorDataPtr greenData = image->getChannel<float>( "G" );
ConstFloatVectorDataPtr blueData = image->getChannel<float>( "B" );
if( !(redData && greenData && blueData) )
{
throw Exception( "Image does not contain valid RGB float channels." );
}
const vector<float> &red = redData->readable();
const vector<float> &green = greenData->readable();
const vector<float> &blue = blueData->readable();
// get a luminance channel
LuminanceOpPtr luminanceOp = new LuminanceOp();
luminanceOp->inputParameter()->setValue( image );
luminanceOp->copyParameter()->getTypedValue() = false;
luminanceOp->removeColorPrimVarsParameter()->getTypedValue() = false;
luminanceOp->operate();
// do the median cut thing to get some samples
MedianCutSamplerPtr sampler = new MedianCutSampler;
sampler->imageParameter()->setValue( image );
sampler->subdivisionDepthParameter()->setNumericValue( subdivisionDepthParameter()->getNumericValue() );
ConstCompoundObjectPtr samples = boost::static_pointer_cast<CompoundObject>( sampler->operate() );
const vector<V2f> ¢roids = boost::static_pointer_cast<V2fVectorData>( samples->members().find( "centroids" )->second )->readable();
const vector<Box2i> &areas = boost::static_pointer_cast<Box2iVectorData>( samples->members().find( "areas" )->second )->readable();
// get light directions and colors from the samples
V3fVectorDataPtr directionsData = new V3fVectorData;
Color3fVectorDataPtr colorsData = new Color3fVectorData;
vector<V3f> &directions = directionsData->writable();
vector<Color3f> &colors = colorsData->writable();
float radiansPerPixel = M_PI / (dataWindow.size().y + 1);
float angleAtTop = ( M_PI - radiansPerPixel ) / 2.0f;
for( unsigned i=0; i<centroids.size(); i++ )
{
const Box2i &area = areas[i];
Color3f color( 0 );
for( int y=area.min.y; y<=area.max.y; y++ )
{
int yRel = y - dataWindow.min.y;
float angle = angleAtTop - yRel * radiansPerPixel;
float weight = cosf( angle );
int index = (area.min.x - dataWindow.min.x) + (dataWindow.size().x + 1 ) * yRel;
for( int x=area.min.x; x<=area.max.x; x++ )
{
color[0] += weight * red[index];
color[1] += weight * green[index];
color[2] += weight * blue[index];
index++;
}
}
color /= red.size();
colors.push_back( color );
float phi = angleAtTop - (centroids[i].y - dataWindow.min.y) * radiansPerPixel;
V3f direction;
direction.y = sinf( phi );
float r = cosf( phi );
float theta = 2 * M_PI * lerpfactor( (float)centroids[i].x, (float)dataWindow.min.x, (float)dataWindow.max.x );
direction.x = r * cosf( theta );
direction.z = r * sinf( theta );
directions.push_back( -direction ); // negated so we output the direction the light shines in
}
// return the result
CompoundObjectPtr result = new CompoundObject;
result->members()["directions"] = directionsData;
result->members()["colors"] = colorsData;
return result;
}
IECore::ConstFloatVectorDataPtr Mix::computeChannelData( const std::string &channelName, const Imath::V2i &tileOrigin, const Gaffer::Context *context, const ImagePlug *parent ) const
{
const float mix = mixPlug()->getValue();
if( mix == 0.0f )
{
return inPlugs()->getChild< ImagePlug>( 0 )->channelDataPlug()->getValue();
}
else if( mix == 1.0f && !maskPlug()->getInput<ValuePlug>() )
{
return inPlugs()->getChild< ImagePlug >( 1 )->channelDataPlug()->getValue();
}
const Box2i tileBound( tileOrigin, tileOrigin + V2i( ImagePlug::tileSize() ) );
IECore::ConstStringVectorDataPtr maskChannelNamesData;
Box2i maskDataWindow;
{
ImagePlug::GlobalScope c( Context::current() );
maskChannelNamesData = maskPlug()->channelNamesPlug()->getValue();
maskDataWindow = maskPlug()->dataWindowPlug()->getValue();
}
const std::string &maskChannel = maskChannelPlug()->getValue();
ConstFloatVectorDataPtr maskData = NULL;
Box2i maskValidBound;
if( maskPlug()->getInput<ValuePlug>() && ImageAlgo::channelExists( maskChannelNamesData->readable(), maskChannel ) )
{
maskData = maskPlug()->channelData( maskChannel, tileOrigin );
maskValidBound = boxIntersection( tileBound, maskDataWindow );
}
ConstFloatVectorDataPtr channelData[2];
Box2i validBound[2];
int i = 0;
for( ImagePlugIterator it( inPlugs() ); !it.done(); ++it,++i )
{
IECore::ConstStringVectorDataPtr channelNamesData;
Box2i dataWindow;
{
ImagePlug::GlobalScope c( Context::current() );
channelNamesData = (*it)->channelNamesPlug()->getValue();
dataWindow = (*it)->dataWindowPlug()->getValue();
}
const std::vector<std::string> &channelNames = channelNamesData->readable();
if( ImageAlgo::channelExists( channelNames, channelName ) )
{
channelData[i] = (*it)->channelDataPlug()->getValue();
validBound[i] = boxIntersection( tileBound, dataWindow );
}
else
{
channelData[i] = NULL;
validBound[i] = Box2i();
}
}
FloatVectorDataPtr resultData = ImagePlug::blackTile()->copy();
float *R = &resultData->writable().front();
const float *A = channelData[0] ? &channelData[0]->readable().front() : NULL;
const float *B = channelData[1] ? &channelData[1]->readable().front() : NULL;
const float *M = maskData ? &maskData->readable().front() : NULL;
for( int y = tileBound.min.y; y < tileBound.max.y; ++y )
{
const bool yValidIn0 = y >= validBound[0].min.y && y < validBound[0].max.y;
const bool yValidIn1 = y >= validBound[1].min.y && y < validBound[1].max.y;
const bool yValidMask = y >= maskValidBound.min.y && y < maskValidBound.max.y;
for( int x = tileBound.min.x; x < tileBound.max.x; ++x )
{
float a = 0;
if( yValidIn0 && x >= validBound[0].min.x && x < validBound[0].max.x )
{
a = *A;
}
float b = 0;
if( yValidIn1 && x >= validBound[1].min.x && x < validBound[1].max.x )
{
b = *B;
}
float m = mix;
if( yValidMask && x >= maskValidBound.min.x && x < maskValidBound.max.x )
{
m *= std::max( 0.0f, std::min( 1.0f, *M ) );
}
*R = a * ( 1 - m ) + b * m;
++R; ++A; ++B; ++M;
}
}
return resultData;
}
void NURBSPrimitive::setTopology( int uOrder, ConstFloatVectorDataPtr uKnot, float uMin, float uMax,
int vOrder, ConstFloatVectorDataPtr vKnot, float vMin, float vMax )
{
// check order isn't too small
if( uOrder<2 )
{
throw Exception( "Order in u direction too small." );
}
if( vOrder<2 )
{
throw Exception( "Order in v direction too small." );
}
// check knots have enough entries for the order.
// an order of N demands at least N control points
// and numKnots==numControlPoints + order
// so we need numKnots>=2*order
if( (int)uKnot->readable().size() < uOrder * 2 )
{
throw Exception( "Not enough knot values in u direction." );
}
if( (int)vKnot->readable().size() < vOrder * 2 )
{
throw Exception( "Not enough knot values in v direction." );
}
// check knots are monotonically increasing
const vector<float> &u = uKnot->readable();
float previous = u[0];
for( unsigned int i=0; i<u.size(); i++ )
{
if( u[i]<previous )
{
throw Exception( "Knots not monotonically increasing in u direction." );
}
previous = u[i];
}
const vector<float> &v = vKnot->readable();
previous = v[0];
for( unsigned int i=0; i<v.size(); i++ )
{
if( v[i]<previous )
{
throw Exception( "Knots not monotonically increasing in v direction." );
}
previous = v[i];
}
// check min and max parametric values are in range
if( uMin > uMax )
{
throw Exception( "uMin greater than uMax." );
}
if( vMin > vMax )
{
throw Exception( "vMin greater than vMax." );
}
if( uMin < u[uOrder-2] )
{
throw Exception( "uMin too small." );
}
if( uMax > u[u.size()-uOrder+1] )
{
throw Exception( "uMax too great." );
}
if( vMin < v[vOrder-2] )
{
throw Exception( "vMin too small." );
}
if( vMax > v[v.size()-vOrder+1] )
{
throw Exception( "vMax too great." );
}
// set everything (taking copies of the data)
m_uOrder = uOrder;
m_uKnot = uKnot->copy();
m_uMin = uMin;
m_uMax = uMax;
m_vOrder = vOrder;
m_vKnot = vKnot->copy();
m_vMin = vMin;
m_vMax = vMax;
}
void FaceAreaOp::modifyTypedPrimitive( MeshPrimitive * mesh, const CompoundObject * operands )
{
string areaPrimVarName = parameters()->parameter<StringParameter>( "areaPrimVar" )->getTypedValue();
if( areaPrimVarName!="" )
{
const string &pName = parameters()->parameter<StringParameter>( "pointPrimVar" )->getTypedValue();
ConstV3fVectorDataPtr pData = mesh->variableData<V3fVectorData>( pName, PrimitiveVariable::Vertex );
if( !pData )
{
throw InvalidArgumentException( boost::str( boost::format( "FaceAreaOp : MeshPrimitive has no \"%s\" primitive variable." ) % pName ) );
}
const vector<V3f> &p = pData->readable();
FloatVectorDataPtr areasData = new FloatVectorData;
vector<float> &areas = areasData->writable();
areas.reserve( mesh->variableSize( PrimitiveVariable::Uniform ) );
PolygonIterator faceEnd = mesh->faceEnd();
for( PolygonIterator pIt = mesh->faceBegin(); pIt!=faceEnd; pIt++ )
{
typedef vector<V3f> PointVector;
areas.push_back( polygonArea( pIt.vertexBegin( p.begin() ), pIt.vertexEnd( p.begin() ) ) );
}
mesh->variables[areaPrimVarName] = PrimitiveVariable( PrimitiveVariable::Uniform, areasData );
}
string textureAreaPrimVarName = parameters()->parameter<StringParameter>( "textureAreaPrimVar" )->getTypedValue();
if( textureAreaPrimVarName!="" )
{
const string &sName = parameters()->parameter<StringParameter>( "sPrimVar" )->getTypedValue();
PrimitiveVariable::Interpolation sInterpolation = PrimitiveVariable::Vertex;
ConstFloatVectorDataPtr sData = mesh->variableData<FloatVectorData>( sName, PrimitiveVariable::Vertex );
if( !sData )
{
sData = mesh->variableData<FloatVectorData>( sName, PrimitiveVariable::FaceVarying );
if( !sData )
{
throw InvalidArgumentException( boost::str( boost::format( "FaceAreaOp : MeshPrimitive has no suitable \"%s\" primitive variable." ) % sName ) );
}
sInterpolation = PrimitiveVariable::FaceVarying;
}
const vector<float> &s = sData->readable();
const string &tName = parameters()->parameter<StringParameter>( "tPrimVar" )->getTypedValue();
PrimitiveVariable::Interpolation tInterpolation = PrimitiveVariable::Vertex;
ConstFloatVectorDataPtr tData = mesh->variableData<FloatVectorData>( tName, PrimitiveVariable::Vertex );
if( !tData )
{
tData = mesh->variableData<FloatVectorData>( tName, PrimitiveVariable::FaceVarying );
if( !tData )
{
throw InvalidArgumentException( boost::str( boost::format( "FaceAreaOp : MeshPrimitive has no suitable \"%s\" primitive variable." ) % tName ) );
}
tInterpolation = PrimitiveVariable::FaceVarying;
}
const vector<float> &t = tData->readable();
if( sInterpolation!=tInterpolation )
{
throw InvalidArgumentException( boost::str( boost::format( "FaceAreaOp : interpolation for \"%s\" and \"%s\" primitive variables don't match." ) % sName % tName ) );
}
FloatVectorDataPtr textureAreasData = new FloatVectorData;
vector<float> &textureAreas = textureAreasData->writable();
textureAreas.reserve( mesh->variableSize( PrimitiveVariable::Uniform ) );
PolygonIterator faceEnd = mesh->faceEnd();
for( PolygonIterator pIt = mesh->faceBegin(); pIt!=faceEnd; pIt++ )
{
if( sInterpolation==PrimitiveVariable::Vertex )
{
typedef PolygonVertexIterator<vector<float>::const_iterator> VertexIterator;
typedef boost::tuple<VertexIterator, VertexIterator> IteratorTuple;
typedef boost::zip_iterator<IteratorTuple> ZipIterator;
typedef boost::transform_iterator<STTupleToV3f, ZipIterator> STIterator;
STIterator begin( ZipIterator( IteratorTuple( pIt.vertexBegin( s.begin() ), pIt.vertexBegin( t.begin() ) ) ) );
STIterator end( ZipIterator( IteratorTuple( pIt.vertexEnd( s.begin() ), pIt.vertexEnd( t.begin() ) ) ) );
textureAreas.push_back( polygonArea( begin, end ) );
}
else
{
assert( sInterpolation==PrimitiveVariable::FaceVarying );
typedef boost::tuple<vector<float>::const_iterator, vector<float>::const_iterator> IteratorTuple;
typedef boost::zip_iterator<IteratorTuple> ZipIterator;
typedef boost::transform_iterator<STTupleToV3f, ZipIterator> STIterator;
STIterator begin( ZipIterator( IteratorTuple( pIt.faceVaryingBegin( s.begin() ), pIt.faceVaryingBegin( t.begin() ) ) ) );
STIterator end( ZipIterator( IteratorTuple( pIt.faceVaryingEnd( s.begin() ), pIt.faceVaryingEnd( t.begin() ) ) ) );
textureAreas.push_back( polygonArea( begin, end ) );
}
}
mesh->variables[textureAreaPrimVarName] = PrimitiveVariable( PrimitiveVariable::Uniform, textureAreasData );
}
}
void RenderManShader::loadShaderParameters( const IECore::Shader *shader, Gaffer::CompoundPlug *parametersPlug, bool keepExistingValues )
{
const CompoundData *typeHints = shader->blindData()->member<CompoundData>( "ri:parameterTypeHints", true );
const StringVectorData *orderedParameterNamesData = shader->blindData()->member<StringVectorData>( "ri:orderedParameterNames", true );
const vector<string> &orderedParameterNames = orderedParameterNamesData->readable();
const StringVectorData *outputParameterNamesData = shader->blindData()->member<StringVectorData>( "ri:outputParameterNames", true );
const vector<string> &outputParameterNames = outputParameterNamesData->readable();
const CompoundData *annotations = shader->blindData()->member<CompoundData>( "ri:annotations", true );
// if we're not preserving existing values then remove all existing parameter plugs - the various
// plug creators above know that if a plug exists then they should preserve its values.
if( !keepExistingValues )
{
for( int i = parametersPlug->children().size() - 1; i >= 0; --i )
{
parametersPlug->removeChild( parametersPlug->getChild<GraphComponent>( i ) );
}
}
// make sure we have a plug to represent each parameter, reusing plugs wherever possible.
set<string> validPlugNames;
for( vector<string>::const_iterator it = orderedParameterNames.begin(), eIt = orderedParameterNames.end(); it != eIt; it++ )
{
if( std::find( outputParameterNames.begin(), outputParameterNames.end(), *it ) != outputParameterNames.end() )
{
continue;
}
// splines are represented by two parameters matched by a naming convention, and we map
// those two parameters to a single SplinePlug.
const bool endsWithValues = ends_with( *it, "Values" );
const bool endsWithPositions = ends_with( *it, "Positions" );
if( endsWithPositions || endsWithValues )
{
string plugName( *it, 0, it->size() - ( endsWithValues ? 6 : 9 ) );
if( validPlugNames.find( plugName ) != validPlugNames.end() )
{
continue;
}
// must use a smart pointers here because we may assign the data the parser creates (and which we therefore own)
ConstFloatVectorDataPtr positions = shader->parametersData()->member<FloatVectorData>( plugName + "Positions" );
ConstDataPtr values = shader->parametersData()->member<Data>( plugName + "Values" );
if( positions && values )
{
const StringData *defaultValuesAnnotation = annotations->member<StringData>( plugName + "Values.defaultValue" );
const StringData *defaultPositionsAnnotation = annotations->member<StringData>( plugName + "Positions.defaultValue" );
if( defaultValuesAnnotation )
{
DataPtr parsedValues;
if( values->isInstanceOf( Color3fVectorData::staticTypeId() ) )
{
parsedValues = parseColors( defaultValuesAnnotation->readable() );
}
else
{
parsedValues = parseFloats( defaultValuesAnnotation->readable() );
}
if( parsedValues )
{
values = parsedValues;
}
else
{
msg(
Msg::Warning, "RenderManShader::loadShaderParameters",
boost::format( "Unable to parse default value \"%s\" for parameter \"%s\"" ) % defaultValuesAnnotation->readable() % ( plugName + "Values" )
);
}
}
if( defaultPositionsAnnotation )
{
FloatVectorDataPtr parsedPositions = parseFloats( defaultPositionsAnnotation->readable() );
if( parsedPositions )
{
positions = parsedPositions;
}
else
{
msg(
Msg::Warning, "RenderManShader::loadShaderParameters",
boost::format( "Unable to parse default value \"%s\" for parameter \"%s\"" ) % defaultPositionsAnnotation->readable() % ( plugName + "Positions" )
);
}
}
switch( values->typeId() )
{
case FloatVectorDataTypeId :
loadSplineParameter<SplineffPlug>( parametersPlug, plugName, positions.get(), values.get() );
break;
case Color3fVectorDataTypeId :
loadSplineParameter<SplinefColor3fPlug>( parametersPlug, plugName, positions.get(), values.get() );
break;
default :
msg(
Msg::Warning, "RenderManShader::loadShaderParameters",
boost::format( "Spline \"%s\" has unsupported value type \"%s\"" ) % plugName % values->typeName()
);
}
validPlugNames.insert( plugName );
continue;
}
}
// the other parameter types map more simply to a single plug each.
const StringData *typeHint = typeHints->member<StringData>( *it, false );
const Data *defaultValue = shader->parametersData()->member<Data>( *it );
switch( defaultValue->typeId() )
{
case StringDataTypeId :
if( typeHint && typeHint->readable() == "shader" )
{
loadCoshaderParameter( parametersPlug, *it );
}
else
{
loadParameter<StringPlug>( parametersPlug, *it, static_cast<const StringData *>( defaultValue )->readable() );
}
break;
case FloatDataTypeId :
loadNumericParameter( parametersPlug, *it, static_cast<const FloatData *>( defaultValue )->readable(), annotations );
break;
case Color3fDataTypeId :
loadCompoundNumericParameter<Color3fPlug>( parametersPlug, *it, static_cast<const Color3fData *>( defaultValue )->readable(), annotations );
break;
case V3fDataTypeId :
loadCompoundNumericParameter<V3fPlug>( parametersPlug, *it, static_cast<const V3fData *>( defaultValue )->readable(), annotations );
break;
case StringVectorDataTypeId :
if( typeHint && typeHint->readable() == "shader" )
{
loadCoshaderArrayParameter( parametersPlug, *it, static_cast<const StringVectorData *>( defaultValue ) );
}
else
{
loadArrayParameter<StringVectorDataPlug>( parametersPlug, *it, defaultValue, annotations );
}
break;
case FloatVectorDataTypeId :
loadArrayParameter<FloatVectorDataPlug>( parametersPlug, *it, defaultValue, annotations );
break;
case Color3fVectorDataTypeId :
loadArrayParameter<Color3fVectorDataPlug>( parametersPlug, *it, defaultValue, annotations );
break;
case V3fVectorDataTypeId :
loadArrayParameter<V3fVectorDataPlug>( parametersPlug, *it, defaultValue, annotations );
break;
default :
msg(
Msg::Warning, "RenderManShader::loadShaderParameters",
boost::format( "Parameter \"%s\" has unsupported type \"%s\"" ) % *it % defaultValue->typeName()
);
}
validPlugNames.insert( *it );
}
// remove any old plugs which it turned out we didn't need
if( keepExistingValues )
{
for( int i = parametersPlug->children().size() - 1; i >= 0; --i )
{
GraphComponent *child = parametersPlug->getChild<GraphComponent>( i );
if( validPlugNames.find( child->getName().string() ) == validPlugNames.end() )
{
parametersPlug->removeChild( child );
}
}
}
}
IECore::ConstFloatVectorDataPtr Merge::merge( F f, const std::string &channelName, const Imath::V2i &tileOrigin ) const
{
FloatVectorDataPtr resultData = NULL;
// Temporary buffer for computing the alpha of intermediate composited layers.
FloatVectorDataPtr resultAlphaData = NULL;
const Box2i tileBound( tileOrigin, tileOrigin + V2i( ImagePlug::tileSize() ) );
for( ImagePlugIterator it( inPlugs() ); !it.done(); ++it )
{
if( !(*it)->getInput<ValuePlug>() )
{
continue;
}
IECore::ConstStringVectorDataPtr channelNamesData = (*it)->channelNamesPlug()->getValue();
const std::vector<std::string> &channelNames = channelNamesData->readable();
ConstFloatVectorDataPtr channelData;
ConstFloatVectorDataPtr alphaData;
if( channelExists( channelNames, channelName ) )
{
channelData = (*it)->channelDataPlug()->getValue();
}
else
{
channelData = ImagePlug::blackTile();
}
if( channelExists( channelNames, "A" ) )
{
alphaData = (*it)->channelData( "A", tileOrigin );
}
else
{
alphaData = ImagePlug::blackTile();
}
const Box2i validBound = boxIntersection( tileBound, (*it)->dataWindowPlug()->getValue() );
if( !resultData )
{
// The first connected layer, with which we must initialise our result.
// There's no guarantee that this layer actually covers the full data
// window though (the data window could have been expanded by the upper
// layers) so we must take care to mask out any invalid areas of the input.
/// \todo I'm not convinced this is correct - if we have no connection
/// to in[0] then should that not be treated as being a black image, so
/// we should unconditionally initaliase with in[0] and then always use
/// the operation for in[1:], even if in[0] is disconnected. In other
/// words, shouldn't multiplying a white constant over an unconnected
/// in[0] produce black?
resultData = channelData->copy();
resultAlphaData = alphaData->copy();
float *B = &resultData->writable().front();
float *b = &resultAlphaData->writable().front();
for( int y = tileBound.min.y; y < tileBound.max.y; ++y )
{
const bool yValid = y >= validBound.min.y && y < validBound.max.y;
for( int x = tileBound.min.x; x < tileBound.max.x; ++x )
{
if( !yValid || x < validBound.min.x || x >= validBound.max.x )
{
*B = *b = 0.0f;
}
++B; ++b;
}
}
}
else
{
// A higher layer (A) which must be composited over the result (B).
const float *A = &channelData->readable().front();
float *B = &resultData->writable().front();
const float *a = &alphaData->readable().front();
float *b = &resultAlphaData->writable().front();
for( int y = tileBound.min.y; y < tileBound.max.y; ++y )
{
const bool yValid = y >= validBound.min.y && y < validBound.max.y;
for( int x = tileBound.min.x; x < tileBound.max.x; ++x )
{
const bool valid = yValid && x >= validBound.min.x && x < validBound.max.x;
*B = f( valid ? *A : 0.0f, *B, valid ? *a : 0.0f, *b );
*b = f( valid ? *a : 0.0f, *b, valid ? *a : 0.0f, *b );
++A; ++B; ++a; ++b;
}
}
}
}
return resultData;
}