On Thu, Apr 23, 2020 at 1:14 PM 'racket' via users-redirect
wrote:
>
> > 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
> 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
Hi Sam,
trying your code I get back the following error:
load-file in bitmap%: not available in a canvas-compatible bitmap:
(object:quartz-bitmap% ...)
The error I get is expected according to the load-file documentation:
"Loads a bitmap from a file format that read from in, unless the bitmap
Thanks! For the first task I think you probably have to use the raw
bitmap% object (since I guess you're using `read-bitmap`). I'm not
sure if there could be some improvement internally so that screen
bitmaps were used to read in the jpegs. Absent an improvement at that
level, I guess I'd just try
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
(My reply to this post bounced on the attempt to send to OP.)
On Wed, Apr 22, 2020 at 3:39 PM 'racket' via users-redirect <
us...@plt-scheme.org> wrote:
>
> 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
I don't know that we can help with the specific call you are reporting a
slowdown for (maybe, but I won't address that here as asking other
questions first seems worth doing).
What are you using the bitmap for, exactly? Just to resize the bitmaps? Or
as a backing store for drawing into the
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
8 matches
Mail list logo
