Path: utzoo!utgpu!water!watmath!clyde!att-cb!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!apollo!oj
From: oj@apollo.uucp (Ellis Oliver Jones)
Newsgroups: comp.sys.apollo
Subject: Re: Need Help with gpr_$open_bitmap_file
Summary: open the file, then use gpr_$pixel_blt
Message-ID: <3b7b91e1.d5b2@apollo.uucp>
Date: 15 Apr 88 20:48:00 GMT
References: <880412.034912z.10599.srt@maui.cs.ucla.edu>
Reply-To: oj@apollo.UUCP (Ellis Oliver Jones)
Organization: Apollo Computer, Chelmsford, MA
Lines: 24

In article <880412.034912z.10599.srt@maui.cs.ucla.edu> srt@CS.UCLA.EDU (Scott Turner) writes:
>Anyone know how to use this godforsaken call to write a bitmap out to 
>a file and then restore it?  

Well, it doesn't "write a bitmap out to a file," but rather creates
a permanent bitmap---one that lives in a file.

If you want to save a pre-existing bitmap you should
 (a) create and open the bitmap file with gpr_$open_bitmap_file and
 (b) use gpr_$pixel_blt to copy the bits from your pre-existing
     bitmap into the new one.
  
Incidentally, you can save the *entire* screen into a bitmap
file using /com/cpcsr .
Does this help?

>Incidentally, another fine example of Apollo documentation.

The GPR docs I have are labelled June 1987, and their writer
did quite a lot of work a year a ago to improve them.  In particular,
GPR_$OPEN_BITMAP_FILE is described in quite a bit of detail.
Do you have the latest docs?

/Ollie Jones  (Speaking for myself, not necessarily for Apollo Computer, Inc.)