Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-tis!ames!ll-xn!mit-eddie!uw-beaver!microsoft!t-benw
From: t-benw@microsoft.UUCP (Benjamin Waldmin)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Scrap Manager (PICT Format)
Summary: Yes, you can use CopyBits to put a bitmap into a picture
Message-ID: <1708@microsoft.UUCP>
Date: 8 Aug 88 23:06:40 GMT
References: <28049@bbn.COM> <6229@chinet.chi.il.us> <6566@umn-cs.cs.umn.edu>
Reply-To: t-benw@microsoft.uucp (Benjamin Waldman)
Organization: Microsoft Corporation, Redmond, WA
Lines: 51

In article <6566@umn-cs.cs.umn.edu> imp@crayview.msi.umn.edu (Chuck Lukaszewski) writes:
>In article <6229@chinet.chi.il.us>, jkingdon@chinet.chi.il.us (James Kingdon) writes:
>> In article <28049@bbn.COM> dredick@vax.bbn.com (The Druid) writes:
>> >So..., How do you specified a Bit Map in a 'PICT'? or am I going about this
>> >wrong?
>> 
>> I would think you could just do an OpenPicture, then a CopyBits (giving
>> it as destination bitmap thePort^.portBits perhaps, I'm not sure the
>> destination bitmap even matters), then ClosePicture and so on.  Have
>> you tried this?
>>
>That approach will disappoint you.  The _OpenPicture and _ClosePicture traps
>are a sort of 'journaling' mechanism by which a series of quickdraw operations
>can be recorded.  _OpenPicture operates on a rectangle you specify, not on
>a brand new window.
>
>That approach only works if you can make the bitmap before you complete your
>program.  If you must do bitmap->PICT conversions on the fly in a program, you
>will need to build your own PICT resource in memory. 
[complicated stuff deleted]

No, you don't have to build your PICT resource.  There's a much easier way.
Suppose I have a window, and I want to create a PICT containing the windows
contents.  I can do the following:

	GetPort(&savePort);
	SetPort(&myWindow);
	myHandle = OpenPicture(myWindow.portRect);
	CopyBits(myWindow.portBits,mywindow.portBits,
		myWindow.portRect,myWindow.portRect,srcCopy,0L);
	ClosePicture();

This code opens a picture the same size as your window, and then does
a copybits, copying the window's contents onto itself.  However, since
a picture is open, drawing into the window with the CopyBits is recorded
in the picture.

Now that you have the picture, you can just copy it to a disk file or to
the clipboard.

Of course, if you only want to copy a portion of the window, rather than
the entire thing, make all the rectangles smaller!

Ben Waldman
Software Design Engineer
Microsoft Corporation

uw-beaver!microsoft!t-benw


Disclaimer:  My thoughts, opinions, suggestions and ideas are purely
my own and are not endorsed by my employer.