[cairo] is self-copy supposed to work?

[Behdad Esfahbod]

On 04/30/2010 03:08 PM, Jonathan Morton wrote:
> There's a design decision to be made here.  Does Cairo only ever do
> what the user explicitly requests, or does it attempt to divine what
> the user means to do?  The latter is what *you* want, and many would
> agree with you, but the exact boundaries of that divination need to be
> specified carefully so as not to leave further bugs or undefined
> loopholes.

Cairo's API is supposed to be user-friendly.  Implementation details come
after.  From a conceptual point of view self-copy is a very well-defined
operation.  Why should the user care how far cairo has to go to implement it?
 OpenGL is definitely the wrong API to compare cairo to.

behdad