> Thanks! For the first task I think you probably have to use the raw
> bitmap% object (since I guess you're using `read-bitmap`).
Hi Robby, I don’t understand how to read a jpeg into a platform-bitmap.
Probably I'm missing something in the documentation…
> For the second, I guess you are cr
e-doc/dvipdfm/mwicks.jpeg")
> (send b get-argb-pixels 20 20 5 5 bs)
> (bytes->list bs)
>
> On Wed, Apr 22, 2020 at 4:39 PM 'racket' via users-redirect
> wrote:
> >
> >
> > Hi,
> > I’m writing to the group looking for help with a performance
Hi Robby, thanks for your reply.
What are you using the bitmap for, exactly? Just to resize the bitmaps? Or as a
backing store for drawing into the canvas? Something else?
Both of them.
* I have more than 10K photos in 4000x3000 format that I’d like to download
from a webdav server, read exif
Hi,
I’m writing to the group looking for help with a performance issue.
I’m coding a gallery like application, using the racket/draw library, but the
bitmap% class seems to be pretty slow. The (make-bitmap 4000 3000) operation
takes more than 4 seconds on my computer (a macbook pro with a 3.1G
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