Article View: comp.sys.amiga.tech
Article #13719Re: How do you draw to the screen quickly? (The real solution)
From: Ed Hanway
Date: Thu, 15 Feb 1990 17:49
Date: Thu, 15 Feb 1990 17:49
19 lines
1750 bytes
1750 bytes
In article <9231@cbnewsm.ATT.COM> nsw@cbnewsm.ATT.COM (Neil Weinstock) writes: >Geez, you guys are all missing the obvious and correct solution. The >answer, as it almost always is, is to use a lookup table. Use the data for >each scan line as the lookup index (simply concatenate the pixel values into >one long binary value), and put the corresponding Image structure into that >table entry. So, you just take the data, look up the appropriate scan line, >and use DrawImage(). Only one operation per scan line. How much quicker >can you get? It's a joke, right? My calculator gave up but "bc" dutifully told me that a look-up table for each possible low-res scan line would take 3176248838703735071388317970997340557438739699483247316076389267090944\ 8424296143487586179936927258864875554241803836083347728168482432449060\ 4855548268961204923221725750403452934972636403246568312773419816518854\ 1019193627059188378560474396174450152676920272486972400155193608576973\ 9549574787063085604610601339929877328920047078547471584268060390863192\ 35148982818821631076219391836160 megabytes of RAM, assuming 4 bit planes. So are you going to post the table? :-)
Technical Details
Message-ID:
<1204@elmgate.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!brutus.cs.uiuc.edu!uakari.primate.wisc.edu!uflorida!mephisto!udel!rochester!kodak!elmgate!jehReferences:
<1092@mindlink.UUCP> <9231@cbnewsm.ATT.COM>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!brutus.cs.uiuc.edu!uakari.primate.wisc.edu!uflorida!mephisto!udel!rochester!kodak!elmgate!jeh From: jeh@elmgate.UUCP (Ed Hanway) Newsgroups: comp.sys.amiga.tech Subject: Re: How do you draw to the screen quickly? (The real solution) Message-ID: <1204@elmgate.UUCP> Date: 15 Feb 90 17:49:43 GMT References: <1092@mindlink.UUCP> <9231@cbnewsm.ATT.COM> Sender: jeh@elmgate.UUCP Reply-To: jeh@elmgate.UUCP (Ed Hanway) Distribution: na Organization: Eastman Kodak Company, Rochester, NY Lines: 19