Method ResizeLanczos

C++/programs/Transform.cpp:142–174

}

void Transform::ResizeLanczos(Image& Source, Image& Dest, int a, cl::NDRange Range)
{
   float RatioX = Source.Width() * 1.f / Dest.Width();
   float RatioY = Source.Height() * 1.f / Dest.Height();

   const SImage& SrcImg = Source;
   const SImage& DstImg = Dest;

   uint length = max(DstImg.Width, DstImg.Height);
   int size = find_lanczos_buffer_size(length);

   TempBuffer factors(*m_CL, size * 2 * a * 2 * sizeof(float));   // 2 lists of factors containing 2*a*size items

   cl::make_kernel<cl::Buffer, float, float, int>
      ((cl::Program) SelectProgram(Source), "prepare_resize_lanczos" + to_string(a))
         (cl::EnqueueArgs(*m_CL, cl::NDRange(length, a * 2, 2)),
            factors, RatioX, RatioY, size);

   switch (a)
   {
   case 2:
      Kernel_(*m_CL, SelectProgram(Source), resize_lanczos2, Range, LOCAL_RANGE,
         In(Source, factors), Out(Dest), SrcImg, DstImg, RatioX, RatioY, size);
      break;
   case 3:
      Kernel_(*m_CL, SelectProgram(Source), resize_lanczos3, Range, LOCAL_RANGE,
         In(Source, factors), Out(Dest), SrcImg, DstImg, RatioX, RatioY, size);
      break;
   default:
      throw cl::Error(CL_INVALID_ARG_VALUE, "unsupported lanczos size");
   }

}

void Transform::Resize(Image& Source, Image& Dest, EInterpolationType Interpolation, bool KeepRatio)
{