RE: [MACTCL] png problem on buttons

[Jeff H. <je...@ac...>]

Daniel A. Steffen wrote:
> On 11/05/2006, at 6:49, Jeff Hobbs wrote:
>=20
> >> I suspect what is going wrong is the copying of the image into the=20
> >> open QD picture used for the bevel button decoration,
>=20
> hmm, it's actually more interesting, in Geoff's latest snippet if the  =

> button .c with the alpha-blended image is by itself, it works just =20
> fine (modulo issues below), as well as with the other button .d =20
> present, but if any of the labels .a or .b are present, the alpha-=20
> blended image doesn't display anymore... so probably some state, =20
> likely a graph port, that is not set/reset properly somewhere.

FWIW, I went through the exercise of ensuring that every SetPort and =
SetGWorld
had a Get/(re)Set surrounding it, and that made no difference for this.

> indeed, artifacts in the transparent pixels can be observed (if .c is  =

> by itself) in the example, due to this issue. We might have to bypass  =

> tk's blending here and pass the complex alpha data directly to the =
OS...

There is also the larger issue that we should be getting away from QD =
and/or
removing all double-buffering tricks for OS X, as it already =
double-buffers.

Jeff