Raul, Thanks for getting back to me so rapidly and for digging into the code. I’d been relying on test.ijs for my understanding of the library’s intended use—but you’re right: nothing stops me from learning a few things and exploiting what’s under the covers. I happen to be on Windows and all I need is to convert encoded in-memory jpg to raw pixels…which, as you imply, the library is doing, presumably (in my case) with GDI. How hard could it be? :-)
Thanks again. Ed Sent from my iPad > On Dec 8, 2022, at 8:08 AM, Raul Miller <rauldmil...@gmail.com> wrote: > > I am not familiar with pplatimag, but browsing the code (in jqt: > open 'graphics/pplatimg') shows that it's mostly platform specific > calls to external shared libraries. > > So I guess the answers to two questions would be particularly relevant here: > > (1) which OS are you using? > > (2) Which parts of pplatimg do you use? > > That said, looking at the code, I do see stuff like > gdk_pixbuf_new_from_data and gdk_pixbuf_save_to_buffer so the answer > to your question is probably yes. > > I hope this helps, > > > -- > Raul > >> On Thu, Dec 8, 2022 at 8:40 AM Ed Gottsman <edward.j.gotts...@gmail.com> >> wrote: >> >> Hello. I have a database of jpgs (~250,000 and likely to grow above 1e6) >> that I’d like to use with gl2’s glpixels routine. It’s an interactive app >> so responsiveness is important. It looks as if the most recent add-on for >> working with jpgs is pplatimg, which seems to assume (judging by the tests) >> that the images are kept in a file system… >> >> …which is unfortunate in this case, because my images happen to be >> comfortably ensconced in a SQLITE BLOB column. They certainly don’t have to >> be. I could export them to the file system, thereby splitting my database >> across two data managers (not terribly appealing). I could also, on the >> fly, retrieve BLOBs, write them to temp jpg files, read them using pplatimg, >> and render them with glpixels (also not appealing on both performance(?) and >> aesthetic grounds). I’m happy to do either (well…the latter) if there’s no >> third choice available, but I thought I’d check first: >> >> Does pplatimg (or some other library) have externally-exposed in-memory jpg >> decoding such that I could retrieve a jpg BLOB to memory, decode it to raw >> pixels, and call glpixels with it? >> >> Or (and the older I get, the more convinced I become that this should be my >> sig) am I looking at this all wrong? >> >> Thanks very much. >> >> Ed >> >> Sent from my iPad >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
