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Home » Developing U++ » U++ Developers corner » SSE2 and SVO optimization (Painter, memcpy....)
SSE2 and SVO optimization (Painter, memcpy....) [message #53751] Mon, 27 April 2020 19:19 Go to previous message
Tom1
Messages: 1212
Registered: March 2007
Senior Contributor
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.

Best regards,

Tom

EDIT: Changed code to use the newly optimized FillRGBA() found in Fillers.h. This can be found at:
https://www.ultimatepp.org/forums/index.php?t=msg&th=110 11&goto=53752&#msg_53752

[Updated on: Sun, 24 May 2020 10:22] by Moderator

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