remove unused Box from ConvolutionKernelType enum

Change-Id: I9f8610bc9ed7d5c175c369973dc8906179ae042d
Reviewed-on: https://gerrit.libreoffice.org/34456Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

vcl/inc/BitmapScaleConvolution.hxx

@@ -27,7 +27,6 @@ namespace vcl
 
 enum class ConvolutionKernelType
 {
-    Box       = 0,
     BiLinear  = 1,
     BiCubic   = 2,
     Lanczos3  = 3,

vcl/inc/ResampleKernel.hxx

@@ -109,21 +109,6 @@ private:
     }
 };
 
-class BoxKernel : public Kernel
-{
-public:
-    BoxKernel() : Kernel () {}
-
-private:
-    virtual double  GetWidth() const override { return 0.5; }
-    virtual double  Calculate (double x) const override
-    {
-        if (-0.5 <= x && x < 0.5)
-            return 1.0;
-        return 0.0;
-    }
-};
-
 } // namespace vcl
 
 #endif // INCLUDED_VCL_RESAMPLEKERNEL_HXX

vcl/source/bitmap/BitmapScaleConvolution.cxx

@@ -374,8 +374,6 @@ bool BitmapScaleConvolution::filter(Bitmap& rBitmap)
 
     switch(meKernelType)
     {
-        case ConvolutionKernelType::Box:
-            return ImplScaleConvolution(rBitmap, mrScaleX, mrScaleY, BoxKernel());
         case ConvolutionKernelType::BiLinear:
             return ImplScaleConvolution(rBitmap, mrScaleX, mrScaleY, BilinearKernel());
         case ConvolutionKernelType::BiCubic: