BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Faster than Pixels[x][y]=clBlack?          BorlandTalk.com Forum Index -> C++ Builder (Graphics) View previous topic :: View next topic   Author Message Nicholas Gessler Guest Posted: Sun Apr 22, 2007 8:37 pm    Post subject: Faster than Pixels[x][y]=clBlack? I am working with a particularly large cellular automata that mimics a computer with a moving tape. I have it working now with PaintBox->Canvas->Pixels and despite all attempts at op- timizing the code it is still too slow. I know there are alternatives to Pixels[x][y] which work much faster. Can someone please provide an example or point me to a reference or two? I recall something about "bit blasting?" and there's also DirectX. Are these compatible with a VCL ap- plication? Any help would be appreciated. Thanks in advance, Nick http://gessler.bol.ucla.edu Back to top Clayton Arends Guest Posted: Sun Apr 22, 2007 8:43 pm    Post subject: Re: Faster than Pixels[x][y]=clBlack? Quote: Can someone please provide an example or point me to a reference or two? Take a look at Scanline. It is much faster to access rows of data that way. Be aware that the data is in the color format of the bitmap (8-bit palette, 16, 24, 32-bit, etc). Quote: I recall something about "bit blasting?" I am unfamiliar with this terminology. Quote: and there's also DirectX. Are these compatible with a VCL ap- plication? http://bcb-tools.com/ - Clayton Back to top Nick Gessler Guest Posted: Sun Apr 22, 2007 9:04 pm    Post subject: Re: Faster than Pixels[x][y]=clBlack? Clayton, I'll look at Scanline. My "image" is about 500 x 800 pixels. I only have to replace less than 1% of the pixels at any iteration. Would Scanline still be faster since it replaces much more than I need at any one time? I looked up BitBlt in the old Help and although I have a Ph.D. I can't make much sense of it. If that is likely to be fast, could anyone post a short 5 x 5 pixel example? Then I could scale it up. I'll try working on this, off and on with interruptions, today. Thanks, Nick Back to top Ron Sawyer Guest Posted: Mon Apr 23, 2007 12:51 am    Post subject: Re: Faster than Pixels[x][y]=clBlack? Basically you create a memory bitmap, you manipulate that, then you bitblt it to the screen. However, if I'm not mistaken the canvas' draw method uses bitblt underneath, so I don't think you will gain anything unless you are currently trying to manipulate the screen image. "Nick Gessler" <gessler (AT) ucla (DOT) edu> wrote in message news:462b877e (AT) newsgroups (DOT) borland.com... Quote: Clayton, I'll look at Scanline. My "image" is about 500 x 800 pixels. I only have to replace less than 1% of the pixels at any iteration. Would Scanline still be faster since it replaces much more than I need at any one time? I looked up BitBlt in the old Help and although I have a Ph.D. I can't make much sense of it. If that is likely to be fast, could anyone post a short 5 x 5 pixel example? Then I could scale it up. I'll try working on this, off and on with interruptions, today. Thanks, Nick Back to top Clayton Arends Guest Posted: Mon Apr 23, 2007 5:02 am    Post subject: Re: Faster than Pixels[x][y]=clBlack? First, I need to say that I rushed my post. For a canvas there is no ScanLine property. That is a property of TBitmap. If you find yourself using an in memory bitmap then you should consider using ScanLine. Quote: Would Scanline still be faster since it replaces much more than I need at any one time? With ScanLine you are simply accessing the raw data pointer not replacing entire rows. There is no copying going on. It is conceptually the same as this: TColor buffer[500][800]; // 800 wide x 500 tall TColor* row = buffer[200]; // ie. ScanLine[200] row[5] = clBlack; // ie. Pixels[5][200] = clBlack row[6] = clBlack; // ie. Pixels[6][200] = clBlack - Clayton Back to top Nick Gessler Guest Posted: Mon Apr 23, 2007 7:51 am    Post subject: Re: Faster than Pixels[x][y]=clBlack? Gentlemen, Thank you for your patience and your ideas. I've put the project I'm working on on my website: http://www.sscnet.ucla.edu/geog/gessler/borland/ca.htm It's an interesting configuration of Conway's rules that builds what one might call, a "computer." It's taken me most of the day to get it working to my satis- faction, albeit working slow. Tomorrow I'll try your sugges- tions. I confess, not only do I need a crash couse in strings, but I'm not familiar with creating a bitmap in memory. I wonder, could I impose on you to give me a small example so that I can scale it up to about 500 by 800? Good night for now. I'll be at it again in the morning. Cheers, Nick Back to top Bruce Salzman Guest Posted: Mon Apr 23, 2007 8:10 am    Post subject: Re: Faster than Pixels[x][y]=clBlack? "Nick Gessler" <gessler (AT) ucla (DOT) edu> wrote in message news:462c1f38$1 (AT) newsgroups (DOT) borland.com... Quote: Gentlemen, Thank you for your patience and your ideas. I've put the project I'm working on on my website: http://www.sscnet.ucla.edu/geog/gessler/borland/ca.htm It's an interesting configuration of Conway's rules that builds what one might call, a "computer." It's taken me most of the day to get it working to my satis- faction, albeit working slow. Tomorrow I'll try your sugges- tions. I confess, not only do I need a crash couse in strings, but I'm not familiar with creating a bitmap in memory. I wonder, could I impose on you to give me a small example so that I can scale it up to about 500 by 800? Hi, Nick Something along these lines, perhaps: // declare in the TForm class definition Graphics::TBitmap* bm; // in the form's contructor bm = new Graphics::TBitmap(); bm->PixelFormat = pf32bit; bm->Width = 500; bm->Height = 800; .... // render next generation DWORD* p; // this assumes a pf32bit format bitmap // loop through each scanline pixel and assign a color for (int y = 0; y < bm->Height; y++){ p = (DWORD *)bm->ScanLine[y]; for (int x = 0; x < bm->Width; x++) p[x] = desiredcolor; } PaintBox1->Repaint(); .... void __fastcall TForm1::PaintBox1Paint(TObject *Sender) { Canvas1->Draw(0,0, bm); } -- Bruce Back to top Bruce Larrabee Guest Posted: Mon Apr 23, 2007 1:25 pm    Post subject: Re: Faster than Pixels[x][y]=clBlack? Hello Nick, Well I'm no expert but I use the Pixels[][] method quite often for a variety of uses. My guess based on the description you've provided is that if you really a need major increase in display rendering speed DirectX is probably the way to go. Based on what you have said I would be surprised if Scanline gave you much of a performance boost. Understand that I may be way wrong about this though.. I have never tried it. In fact I'd be most interested in your results if you do try it in this application please post some stats if you are able to do so? I have researched DirectX. And tested it on our favorite lil' compiler with no problems (not an exhaustive set of tests though..) The tricky part is understanding it... If you want to try it and what to email me about that part please feel free to do so. 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