[cairo] Images with stride == width?

[Behdad Esfahbod]

Vladimir Vukicevic wrote:
> On 1/20/09 6:44 AM, Ian Britten wrote:
>> Damian Frank wrote:
>>> *bump*
>>>
>>> I'd like to know the answer to this, too.  Can anyone comment?
>>>
>>> (I recall browsing the source suggested to me that I was fine for now,
>>> but future revisions could break my code.  Is this accurate?)
>> [ Sorry for the delay - Been upgrading my computer... ]
>>
>> Having now tried this, I can report that you'll simply get a
>> CAIRO_STATUS_INVALID_STRIDE error if you try this.
> 
> Er, whoa.  When did this change?  This seems like a pretty major 
> performance-breaker when using cairo to interface with any existing 
> buffer of data -- having two copies of the data around or copying the 
> data is really not a good solution.  I thought the suggestion was to use 
> the computed stride if possible, but any stride should be possible 
> (because, why wouldn't it be?) as long as it's at least whatever the 
> minimum is for the relevant format.  Is this no longer the case?

Strides not multiple of 4 never worked.  We just formalized it so you get an
error message that makes sense, instead of NO_MEMORY or memory corruption in
pixman.

behdad

>      - Vlad