> > Hello all, > > > > probably this has come up before, but I can't find it: > > > > my application has to display JPEG images, but does not load > > them from disk files. They come in as blobs from a remote database. > > > > Is there a way to load these into an Fl_JPEG_image? > > > > Right now I am reduced to writing them to a temp file, and then reading > > that into the image. But that is a bad solution: it assumes that I can > > write to disk in this application. > > > > I read the code (fltk 1.1.9), there doesn't seem to be a straightforward > > way, can't just hook up an istream, or something of that nature. > > > > Any advice? > > > > > > I expect you will have to modify Fl_JPEG_Image. FLTK 1.1.9 has > Fl_JPEG_Image(const char *jpeg) which is hard-coded to expect a filename. > Write a new constructor that takes your blob of JPEG data instead, and base > it on the existing code from Fl_JPEG_Image. > > I'm pretty sure this can be done, and I think you will need to make the > following changes: > > 1. get rid of references to the FILE pointer in the function (declaration, > fopen(), flose()). > > 2. replace the call to jpeg_stdio_src() with code to fill the > jpeg_decompress_struct with function pointers that will operate on your blob > of JPEG data rather than a FILE pointer. > > I've never done it, but I expect you should be able to find examples on the > internet... if not, how hard could it be (memcpy(), current position pointer, > etc.)? If you download the actual jpeglib full source, the file djpeg.c > provides function pointers for setting up the library to handle FILE pointer > streams... work from that. > > You're probably in for a a few hours coding and testing though. > > good luck, > Don. > > >
sorry, not djpeg.c but jdatasrc.c, which is part of the jpeg library included with FLTK. _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
