void onDraw(SkCanvas* canvas) override {
SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
SkAutoTUnref<SkSurface> surf(canvas->newSurface(info, nullptr));
if (!surf.get()) {
surf.reset(SkSurface::NewRaster(info));
}
drawInto(surf->getCanvas());
SkAutoTUnref<SkImage> image(surf->newImageSnapshot());
canvas->drawImage(image, 10, 10, nullptr);
SkAutoTUnref<SkSurface> surf2(image->newSurface(info, nullptr));
drawInto(surf2->getCanvas());
// Assert that the props were communicated transitively through the first image
SkASSERT(equal(surf->props(), surf2->props()));
SkAutoTUnref<SkImage> image2(surf2->newImageSnapshot());
canvas->drawImage(image2, 10 + SkIntToScalar(image->width()) + 10, 10, nullptr);
}
ASMmxBase::SurfaceVec ASMmxBase::establishBases(Go::SplineSurface* surf,
MixedType type)
{
SurfaceVec result(2);
// With mixed methods we need two separate spline spaces
if (type == FULL_CONT_RAISE_BASIS1 || type == FULL_CONT_RAISE_BASIS2)
{
// basis1 should be one degree higher than basis2 and C^p-1 continuous
int ndim = surf->dimension();
Go::BsplineBasis b1 = surf->basis(0).extendedBasis(surf->order_u()+1);
Go::BsplineBasis b2 = surf->basis(1).extendedBasis(surf->order_v()+1);
/* To lower order and regularity this can be used instead
std::vector<double>::const_iterator first = ++surf->basis(0).begin();
std::vector<double>::const_iterator last = --surf->basis(0).end();
Go::BsplineBasis b1 = Go::BsplineBasis(surf->order_u()-1,first,last);
first = ++surf->basis(1).begin();
last = --surf->basis(1).end();
Go::BsplineBasis b2 = Go::BsplineBasis(surf->order_v()-1,first,last);
*/
// Compute parameter values of the Greville points
size_t i;
RealArray ug(b1.numCoefs()), vg(b2.numCoefs());
for (i = 0; i < ug.size(); i++)
ug[i] = b1.grevilleParameter(i);
for (i = 0; i < vg.size(); i++)
vg[i] = b2.grevilleParameter(i);
if (surf->rational()) {
std::vector<double> rCoefs(surf->rcoefs_begin(), surf->rcoefs_end());
// we normally would set coefs as (x*w, y*w, w)
// however, gotools use this representation internally already.
// instance a Bspline surface in ndim+1
Go::SplineSurface surf2(surf->basis(0), surf->basis(1), rCoefs.begin(), ndim+1, false);
// interpolate the Bspline surface onto new basis
RealArray XYZ((ndim+1)*ug.size()*vg.size());
surf2.gridEvaluator(XYZ,ug,vg);
std::unique_ptr<Go::SplineSurface> surf3(Go::SurfaceInterpolator::regularInterpolation(b1,b2,ug,vg,XYZ,ndim+1,false,XYZ));
// new rational coefs are (x/w', y/w', w')
// apparently gotools will rescale coeffs on surface creation.
result[0].reset(new Go::SplineSurface(surf3->basis(0), surf3->basis(1), surf3->coefs_begin(), ndim, true));
} else {
RealArray XYZ(ndim*ug.size()*vg.size());
// Evaluate the spline surface at all points
surf->gridEvaluator(XYZ,ug,vg);
// Project the coordinates onto the new basis (the 2nd XYZ is dummy here)
result[0].reset(Go::SurfaceInterpolator::regularInterpolation(b1,b2,
ug,vg,XYZ,ndim,
false,XYZ));
}
result[1].reset(new Go::SplineSurface(*surf));
}
else if (type == REDUCED_CONT_RAISE_BASIS1 || type == REDUCED_CONT_RAISE_BASIS2)
{
// Order-elevate basis1 such that it is of one degree higher than basis2
// but only C^p-2 continuous
result[0].reset(new Go::SplineSurface(*surf));
result[0]->raiseOrder(1,1);
result[1].reset(new Go::SplineSurface(*surf));
}
else if (ASMmxBase::Type == ASMmxBase::DIV_COMPATIBLE)
{
result.resize(3);
// basis1 should be one degree higher than basis2 and C^p-1 continuous
int ndim = surf->dimension();
Go::BsplineBasis a1 = surf->basis(0);
Go::BsplineBasis a2 = surf->basis(1);
Go::BsplineBasis b1 = surf->basis(0).extendedBasis(surf->order_u()+1);
Go::BsplineBasis b2 = surf->basis(1).extendedBasis(surf->order_v()+1);
// Compute parameter values of the Greville points
size_t i;
RealArray u0(a1.numCoefs()), v0(a2.numCoefs());
for (i = 0; i < u0.size(); i++)
u0[i] = a1.grevilleParameter(i);
for (i = 0; i < v0.size(); i++)
v0[i] = a2.grevilleParameter(i);
RealArray ug(b1.numCoefs()), vg(b2.numCoefs());
for (i = 0; i < ug.size(); i++)
ug[i] = b1.grevilleParameter(i);
for (i = 0; i < vg.size(); i++)
vg[i] = b2.grevilleParameter(i);
// Evaluate the spline surface at all points
// Project the coordinates onto the new basis (the 2nd XYZ is dummy here)
RealArray XYZ0(ndim*ug.size()*v0.size()), XYZ1(ndim*u0.size()*vg.size());
surf->gridEvaluator(XYZ0,ug,v0);
surf->gridEvaluator(XYZ1,u0,vg);
result[2].reset(new Go::SplineSurface(*surf));
result[0].reset(Go::SurfaceInterpolator::regularInterpolation(b1,a2,
ug,v0,XYZ0,ndim,
false,XYZ0));
result[1].reset(Go::SurfaceInterpolator::regularInterpolation(a1,b2,
u0,vg,XYZ1,ndim,
false,XYZ1));
geoBasis = 3;
}
if (type == FULL_CONT_RAISE_BASIS2 || type == REDUCED_CONT_RAISE_BASIS2)
std::swap(result[0], result[1]);
return result;
}