Hi,

Here's an optimization for BufferPainter.

BufferPainter::Clear(RGBA) speed is improved by over 30 % with the following change in Painter/Render.cpp:

void BufferPainter::ClearOp(const RGBA& color)
{
//	UPP::Fill(~*ip, color, ip->GetLength());
	FillRGBA(~*ip, color, ip->GetLength());
	ip->SetKind(color.a == 255 ? IMAGE_OPAQUE : IMAGE_ALPHA);
}

And in Painter/Fillers.h:

namespace Upp {

// Add the following line:
#define FillRGBA(a,b,c) memsetd((a),*(dword*)&(b),(c)) 

struct SolidFiller : Rasterizer::Filler {

This may be significant in some usage scenarios as it can currently take e.g. 4.5 milliseconds to clear a 4K ImageBuffer before drawing to it. This can now be reduced to 2.8 milliseconds.