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From: ridder@elvira.enet.dec.com (Hans Ridder)
Newsgroups: comp.sys.amiga.tech
Subject: Re: DrawImage() woes. (LONG)
Keywords: DrawImage(), PlanePick, PlaneOnOff
Message-ID: <625@shodha.dec.com>
Date: 19 Jan 90 21:40:30 GMT
References: <487@dsoft.UUCP> <1990Jan17.101103.10084@gdt.bath.ac.uk> <9389@cbmvax.commodore.com>
Sender: news@shodha.dec.com
Organization: Digital Equipment Corporation, Customer Support Center
Lines: 34

In article <9389@cbmvax.commodore.com> peter@cbmvax.commodore.com
 (Peter Cherna) writes:
>If your compiler doesn't support the "chip" keyword, then
>leave out the word "chip" above and say
>
>	ChipData = (UWORD *)AllocMem(sizeof(ImageData), MEMF_CHIP);
>	if (ChipData)
>	    {
>	    CopyMem(ImageData, ChipData, sizeof(ImageData));
>	    myImage.ImageData = ChipData;
>	    ...
>	    }
>	else
>	    {
>	    /*  chip mem allocation failed */
>	    }

In this case, wouldn't be a good idea to use the TypeOfMem() Exec
function to determine if the ImageData was was already in chip memory?
Something like (I don't have the RKM's here, so no snickering):

    if ((TypeOfMem(ImageData) & MEMF_CHIP) == 0) {
	ChipData = (UWORD)AllocMem(sizeof(ImageData), MEMF_CHIP);
	... /* All the stuff you had */
    }

>     Peter Cherna, Software Engineer, Commodore-Amiga, Inc.
>     {uunet|rutgers}!cbmvax!peter    peter@cbmvax.cbm.commodore.com

-hans
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  Hans-Gabriel Ridder			Digital Equipment Corporation
  ridder@elvira.enet.dec.com		Customer Support Center
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