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Path: utzoo!mnetor!seismo!rutgers!cbmvax!carolyn
From: carolyn@cbmvax.cbm.UUCP (Carolyn Scheppner CATS)
Newsgroups: comp.sys.amiga
Subject: Re: SUPER_BITMAP Windows
Message-ID: <1691@cbmvax.cbmvax.cbm.UUCP>
Date: Mon, 20-Apr-87 10:00:44 EST
Article-I.D.: cbmvax.1691
Posted: Mon Apr 20 10:00:44 1987
Date-Received: Tue, 21-Apr-87 00:46:59 EST
References: <1013@crash.CTS.COM>
Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Organization: Commodore Technology, West Chester, PA
Lines: 43

In article <1013@crash.CTS.COM> billk@pnet01.CTS.COM (Bill Kelly) writes:
>[]
>                                            ...  so, I decided to open a
>SUPER_BITMAP, GIMMEZEROZERO window (in a customscreen) so that I could draw
>my text into it's own bitmap without disturbing anybody.  The problem is that
>I am drawing into the bitmap, but the bitmap isn't being displayed on the
>screen.  Is there any trick to doing this? ...
>[]

   A SuperBitmap window's own bitplanes are used for off-screen rendering
and storage of image when the window is sized.  Anything rendered in
the displayed portion of a SuperBitmap window is rendered in the SCREEN's
bitplanes.

   There are two graphics.library functions for updating the displayed and
non-displayed parts of a SuperBitmap window.  These functions should be
used within a LockLayerRom() / UnlockLayerRom() pair.

   1. SyncSBitMap(layer *)

      Updates the SuperBitmap's own bitplanes from the displayed portion
      in the screen's bitmap.

      This could be used, for instance, to update the SuperBitmaps own
      bitplanes prior to saving them as an ILBM.  Note that the BitMap
      structure that YOU set up for the SuperBitmap window is NOT
      the one pointed at by the Window structure.  The pointer to
      that BitMap is stored in window->Layer->SuperBitMap.

   2. CopySBitMap(layer *)

      Updates the visible portion of the SuperBitmap (in SCREEN's bitplanes)
      from the SuperBitmap window's own bitplanes.

      This can be used if you have rendered to or cleared the SuperBitmap
      planes and wish to update the visible display to match it.

-- 
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Carolyn Scheppner -- CBM   >>Amiga Technical Support<<
                     UUCP  ...{allegra,caip,ihnp4,seismo}!cbmvax!carolyn 
                     PHONE 215-431-9180
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