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From: ddisabat@deimos.ADS.COM (David Disabatino)
Newsgroups: comp.sys.mac.programmer
Subject: Help with LSC 3.0 CopyBits
Message-ID: <7731@zodiac.UUCP>
Date: 28 Apr 89 21:45:38 GMT
Sender: news@zodiac.UUCP
Reply-To: ddisabat@ads.com (David Disabatino)
Distribution: na
Organization: Advanced Decision Systems, Mt. View, CA (415) 960-7300
Lines: 34

I am having some trouble with Copybits used to copy a pixmap into
a window pixmap.  I have created a pixmap for an image loaded in.
The data is in a nonrelocatable block in the heap.  I create a
pixmap for the image (8 bits / pix)

pixhndl = NewPixMap();
(**pixhndl).rowBytes = image.width;
(**pixhndl).bounds = StuffRect(0, 0, image.width, image.length);
(**pixhndl).baseAddr = (Ptr)image.data;
image.pmap = pixhndl;

Then I try to copybits this pixmap onto a window.
SetRect(&srcrect, 0, 0, image.width, image.length);
SetRect(&dstrect, 0, 0, image.width, image.length);
CopyBits(image.pmap, &srcrect, win->portPixMap, &dstrect, srcCopy, NULL);

It doesn't crash or anything, but I see no visible results on screen.
Maybe the call to CopyBits is wrong?  But any other combination of
args gives compiler errors.  Is it legal to set up a pixmap like this
without a GrafPort.  I know the data is there, because if I physically
write it into the window pixmap it appears on screen, albeit rather
slowly.

for (i = 0 ; i < img.length ; i++)
  for (j = 0 ; j < img.width ; j++)
    *((**win->portPixMap).baseAddr + j + 
           (i * ((**win->portPixMap).rowBytes & 0x1FFF))) =
      *(img.data + j + (i * img.width));

This works fine.  Of course there are a few casts in the above staement.
Please if anyone knows how to copy pixmaps, clue me in.

thanks
dd