Re: [AD] clipping line algorithm

[Sven Sandberg <svens@xxxxxxxxxx>]

Eric Botcazou wrote:
> Well, no. Those who put the 'linear' flag (or rather who don't put the 
> 'planar' flag, this is admittedly not very well designed) on their bitmaps 
> are supposed to know what this implies, i.e essentially that the user can 
> call _putpixel() and bmp_write() on them.
>
> But, in my opinion, setting this linear flag doesn't preclude them from 
> wiring a custom vtable, which should be guaranteed not to be bypassed by the 
> first drawing primitive they call.

Huh, sorry but doesn't your second paragraph contradict your first? 
_putpixel() and bmp_write() are not in the vtable. (And they should not 
be in the vtable either, because then they cannot be inlined. The reason 
for anyone to use _putpixel() and bmp_write() is that they are fast, and 
they are fast because they are inlined.)

So it seems contradictory that users setting the linear flag both:
(1) must count with the possibility that _putpixel()/bmp_write() can be 
used on it, and
(2) can be assured the bitmap is never accessed without going through 
the vtable.

Me misunderstood you?

/Sven