[cairo] Cairo and ISO C++

Bill Spitzak spitzak at gmail.com
Wed Jan 15 11:08:50 PST 2014

That is just making it more complicated which does not help.

I suspect some backends are more efficient if they clear the path as 
part of the fill/stroke. I was hoping that saying that you cannot modify 
the path after fill/stroke would allow such backends to work while 
preserving the path. But now I am not so sure, especially if the backend 
is PostScript.

Ray Gardener wrote:
> On 1/14/2014 3:10 PM, Bill Spitzak wrote:
>> I would have filling/stroking a path not clear the path, but instead 
>> put cairo in a state so the next moveto/lineto will clear the path. 
>> This will allow fill, stroke to work like users expect, and by 
>> removing the "preserve" calls reduce the size of the api.
> As a general design rule, it's nice if functions have minimal or no side 
> effects. There is an explicit way to clear the path: newpath.
> You could add a new function: setpostpaintbehavior(enum { 
> clearcurrentpath, preservecurrentpath });
> By default, the post-paint behavior does what it currently does, which 
> is to clear the current path after fill/stroke. But the user can change 
> it to preserve the path. The "preserve" APIs could then be dropped. The 
> arg is an enum so a CLEAR_PATH_ON_NEXT_MOVETO could be added too, if you 
> want that behavior.
> Ray

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