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 canvas? Something else? Robby 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 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 > 3.1GHz dual core i5 and 16GB ram). > What I'd need to do is simply read and resize some jpeg files to display > them in a canvas. I could use some external program to resize the photos > but I would prefer to work with racket only. The make-platform-bitmap is 20 > times faster than the make-bitmap, but I didn’t find a way to draw a jpeg > on it. > Do you have any suggestion? > > Thanks, > Andrea > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/etPan.5ea0ab6b.35178ff7.17869%40andreagiardina.com > <https://groups.google.com/d/msgid/racket-users/etPan.5ea0ab6b.35178ff7.17869%40andreagiardina.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAL3TdONjYztUX_MR4yLDf4rR2W_Vswc5J4hDhNKn%2BK5hVdN6PQ%40mail.gmail.com.
