> It looks like the alpha channel is being set to 0:

Yes. This problem has been reported several times in the past and there are
at least three messages I wrote on this subject in the past (not that I have
them handy though ;)

Cheers,
  - Andreas

> -----Original Message-----
> From: squeak-dev-bounces at lists.squeakfoundation.org 
> [mailto:squeak-dev-bounces at lists.squeakfoundation.org] On 
> Behalf Of Ned Konz
> Sent: Sunday, September 07, 2003 8:01 PM
> To: The general-purpose Squeak developers list
> Subject: Re: [BUG] forms with bad alpha values?
> 
> 
> On Sunday 07 September 2003 10:51 am, Ned Konz wrote:
> > On Sunday 07 September 2003 10:02 am, Ned Konz wrote:
> > > On Sunday 07 September 2003 09:42 am, Ned Konz wrote:
> > > > I've been trying to fix the problem with disappearing Objects
> > > > Tool buttons. I've got it all fixed except for the Paint tool.
> > > > What's happening is that its form (a standard form) is
> > > > rendering as transparent in depth 32.
> > >
> > > Which you can also see using:
> > >
> > > PartsBin clearThumbnailCache.
> > > Display newDepth: 32.
> > > quads _ OrderedCollection new.
> > > PaintInvokingMorph  addPartsDescriptorQuadsTo: quads if: [:x |
> > > true]. tuple _ quads first.
> > > aClass _ Smalltalk at: tuple first.
> > > t _ PartsBin thumbnailForQuad: tuple.
> > > t openInHand.
> >
> > Or, more concisely:
> >
> > Display newDepth: 32.
> > (SketchMorph withForm: PaintInvokingMorph newStandAlone imageForm)
> > openInHand.
> 
> It looks like the alpha channel is being set to 0:
> 
> Display newDepth: 32.
> f _ PaintInvokingMorph newStandAlone imageForm.
> (f pixelValueAt: 30 at 30) hex  
> 	'16r884000'
> f rgbaBitMasks collect: [ :ea | ea hex ]
>  	#('16rFF0000' '16rFF00' '16rFF' '16rFF000000')
> f colorAt: 30 at 30  
> 	Color transparent
> (f asFormOfDepth: 16) colorAt: 30 at 30
> 	 (Color r: 0.548 g: 0.258 b: 0.0)
> 
> -- 
> Ned Konz
> http://bike-nomad.com
> GPG key ID: BEEA7EFE
> 
>