On 7 Jun 2021, at 21:01, Bill Spitzak wrote:
> 
> I think there is some mistakes in current FLTK, in particular the "Driver" api, which uses virtual functions for no reason whatsoever as the called code is chosen at compile time, and as seen here the design makes it really difficult to share code. Would prefer to use #if statements like they are supposed to. I don't consider the current design readable or maintainable. I may be missing some function of Driver where more than one can be used, please correct me if I am wrong.

I think the *idea* (if not yet the actuality) of this is that at some point it stops being a compile time option and becomes more of a runtime option: indeed X11 vs. Wayland (or GDI vs. GDI+) might be ideal cases where that might come into play... But not quite yet.


> The "Device" is somewhat useful as it allows you to draw widgets in GL windows. I think there is also an attempt to allow it to print, though I am unclear if it is actually possible to use it for that and if anybody has done so. I still feel the number of virtual functions on it is excessive.

The printing support works pretty well, I’ve used it a fair bit and been quite pleased with the outcomes...
I have no opinion on what constitutes “too many” virtual functions. (Though, if the compiler can resolve the types statically, and often it can, then the virtualisation may be “free” at that point anyway. Which doesn’t help readability, I concede, but it’s helpful for runtimes.)


> It sounds like Cairo is nowhere near as slow as others have claimed.

It can be - just when you think it’s all going so well, it sneaks around and sticks you from behind!
There’s just “some things” on “some machines” where it suddenly runs like treacle; and I’m not even sure if it is the *same* things in each case...



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