[cairo] Disabling antialiased shape drawing

[Bill Spitzak]

It certainly seems to me that a single API will work for this.

It looks like people want exactly three things:

1. Antialiasing of some form. This is the default state of Cairo.

2. Supersampling for antialiasing is ok, but partial pixel coverage is 
not. The result will look like #1 or #3 depending on the driver.

3. Need to emulate old graphics. No supersampling or antialiasing is wanted.

Looks like 3 constants to me.

Robert O'Callahan wrote:
> On Thu, 2005-08-04 at 22:05 -0500, Billy Biggs wrote:
> 
>>Robert O'Callahan (rocallahan at novell.com):
>>
>>
>>>> 2. The API can be safely ignored by backends that do not require this
>>>>    setting, such as the PS or PDF outputs.
>>>
>>>Making this API non-mandatory means that an application that wants to
>>>use supersampling has to know, for each surface type it uses, whether
>>>or not the surface type really supports this API. But such
>>>applications already need to know which surface types need
>>>supersampling, so I guess this is OK, as long as a surface type's
>>>support for this API is considered part of the interface and isn't
>>>removed in the future.
>>
>>  I think you need something else.  I want to ask a backend to disable
>>antialiasing, and I think you want to ask if you should do supersampling
>>for it.  I don't think that one pair of functions should try to do both.
> 
> 
> If I create the surface, I may not need to ask whether the surface
> supports supersampling. I may just know that Xlib surfaces do and PDF
> surfaces don't. I have your API to turn off antialiasing for the Xlib
> surface, but I need some assurance that the Xlib surface is really going
> to turn it off when I ask it to. All I need is the promise that
> Xlib-surface's existing support won't be taken away.
> 
> Rob
> 
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