[Gambas-user] gb3: DrawAlpha
kevinfishburne at ...1887...
Tue Jul 5 21:49:36 CEST 2011
On 07/05/2011 06:34 AM, Benoît Minisini wrote:
>> Since DrawImage just copies the RGBA channels and PaintImage blends the
>> channels using the alpha channel, I'm assuming that DrawAlpha copies
>> (but does not blend) the alpha channel. Is that the case?
> Actually DrawAlpha is PaintAlpha. I saw no point of just copying the alpha
> Blending the alpha channel is just keeping the greater transparency between
> the destination pixel and the source pixel. This is what DrawAlpha does.
Very good. I think I misunderstood how it worked, despite it doing what
it was supposed to in my program.
> By the way, I have fixed a bug in the alpha blending of PaintImage in revision
> #3926. Tell me if you notice the change.
I'm going to try recompiling again since revision 3910 involved SDL, but
right now I get the error "The program has returned the value: 127" as
soon as Client.Initialize() calls Render.Initialize(). The procedure
call raises the error immediately, not a line inside the
Render.Initialize() procedure, which is interesting.
I'll let you know the results when I compile again to 3910 or higher,
and if there's any different in appearance or frame rate since the
PaintImage bug fix.
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