[racket] Facing some flickering problems

From: Mathew Kurian (bluejamesbond at gmail.com)
Date: Thu Jul 22 21:29:08 EDT 2010

So in terms of garbage collection...the deletion of those arrays are the
only part.

On Thu, Jul 22, 2010 at 9:27 PM, Robby Findler
<robby at eecs.northwestern.edu>wrote:

> On Thu, Jul 22, 2010 at 8:21 PM, Mathew Kurian <bluejamesbond at gmail.com>
> wrote:
> > If someone has a bit of spare time, can he/she explain how these images
> are
> > loaded (time, allocation, garbage collection, etc) and then reproduced
> again
> > during the redraws, it would be extremely useful.
> That particular aspect of the system is unlikely to be able to be
> improved (altho there may be some windows-specific strangeness I
> suppose; if you try on a mac and see the same behavior that would
> confirm my opinion).
> Instead, the question will be how to avoid doing the drawing that often.
> But to answer your question, the images are loaded by reading the
> file, interpreting the data stored there and creating a bitmap% object
> that records an flat array of the colors. Then, during drawing that
> data is (efficiently) copied onto the screen.
> Robby
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