It is very well possible that fltk1 is more efficient than fltk2. Code bases have forked six or so years ago with fltk 1 being the mora active branch ATM. Rendering an RGB data set is relatively slow. Using a cached bitmap in native format is much faster. For some applications, OpenGL is the fastest solution.
Matthias Sent from my iPhone On 26.11.2009, at 16:21, Dusan Ivanko <[email protected]> wrote: > please help! > > I have compiled same program in FLTK2 (fltk-2.0.x-r6834) and FLTK1 > (fltk-1.3.x-r6943) and the drawing performance is visibly worse in > fltk2 version of the program. Both versions have been compiled on > the same machine in same Windows operating system. > > The program is very simple. In FLTK2 version I inherited from Window > widget and overwritten the draw(). In FLTK1 version I inherited from > Fl_Double_Window and again overwritten the draw(). I also > overwritten handle() but the code is identical there. > > The code in draw() renders the RGB image into the memory using AGG > graphics library. And for drawing the image I use: > //fltk1: > fl_draw_image(buf, 0, 0, w(), h()) ; > > //fltk2: > drawimage(buf, RGB, Rectangle(0, 0, w(), h())); > > In the main() of fltk2 version after window->show() I do: > window->set_double_buffer(); > > program main() starts with: > //fltk1: > if (!Fl::visual(FL_DOUBLE)) > log_file.print("Xdbe not supported, faking double buffer with > pixmaps."); > > //fltk2: > if (!visual(DOUBLE_BUFFER)) > log_file.print("Xdbe not supported, faking double buffer with > pixmaps."); > > when executing either of programs I find the above message written > in my log file(means that visual() returns false in both cases). > > Apart from this there are no relevant differences between the two in > the code. The program just render two circles, ellipses and lines as > you click and drag the mouse across the window. The drawing is > visibly not as smooth in FLTK2 version as in the FLTK1 version of > the program. The CPU is around 80% busy in both programs when > drawing. Both fltk1 and fltk2 have been configured with > ./configure --enable-xft --enable-xdbe > compiled and instaled in Windows MinGW enviroment. > > I have big project written in the FLTK2 which is using drawing from > the memory (using drawimage()) and I don't want to rewrite > everything to FLTK1 code. It might not even be possible not speaking > how time consuming it would be. I wonder what is the cause for FLTK2 > drawing not to be as smooth/quick as in FLTK1. > > Any help is much appreciated! > > > > _______________________________________________ > fltk mailing list > [email protected] > http://lists.easysw.com/mailman/listinfo/fltk _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
