Re: [Pyobjc-dev] Anyone using Foundation.NSRectFillList?

[Ronald O. <ous...@ci...>]

On Wednesday, 23 July, 2003, at 18:22, b.bum wrote:

> On Tuesday, July 22, 2003, at 12:16 PM, Ronald Oussoren wrote:
>> I just noticed that the interface of the wrapped NSRectFillList is a 
>> bit odd. Is anyone using this function at the moment, I'd like to 
>> clean up the interface.
>>
>> The current interface accepts a string containing the struct.pack-ed 
>> representation of an array of NSRects,
>> it should accept a sequence of NSRects instead.
>
> If you are talking about a sequence of python tuples/lists, it should 
> not though accepting both would certainly be preferable.

The current implementation (checked in this morning, MEST) accepts the 
'old' style arguments as well as a sequence of python tuples 
representing NSRects.

>
> That implementation came out of my quest to see how fast I could get 
> individual pixels to the screen.  The answer is an array of 1x1 
> rectangles passed to NSRectFillList().   Packing/unpacking across the 
> bridge is painfully slow -- an order of magnitude slower -- than using 
> an array of of struct packed floats.
>
> I have been meaning to turn the app I used to do the testing into an 
> example.   Using NSBezierPath generated about 10,000 points every 2 
> seconds... NSBitmapImageRep could plot around 25,000 or something.... 
> NSRectFillList as currently implemented could do 250,000 points every 
> 2 seconds.

Speed is an issue of course, but I'd expect that using the new 
arguments would be as fast as struct.pack + old arguments. That is, 
unless you draw the same rects over and over again. I'll leave the 
old-style arguments in for when speed is really important.

Ronald