/// <inheritdoc/> protected override void BeforeImageApply(Image <TPixel> source, Image <TPixel> destination, Rectangle sourceRectangle) { if (!(this.Sampler is NearestNeighborResampler)) { // Since all image frame dimensions have to be the same we can calculate this for all frames. MemoryAllocator memoryAllocator = source.GetMemoryAllocator(); this.horizontalKernelMap = ResizeKernelMap.Calculate( this.Sampler, this.TargetRectangle.Width, sourceRectangle.Width, memoryAllocator); this.verticalKernelMap = ResizeKernelMap.Calculate( this.Sampler, this.TargetRectangle.Height, sourceRectangle.Height, memoryAllocator); } }