I believe the operation he is trying to perform is an inversion of
the colours - making the picture a negative of itself, as opposed to
flipping it horizontally or vertically.
I believe the procedure being used is the fastest available within RB
5.2 for this purpose. Newer versions of RB have substantially
improved speed for RGBsurface operations, but that's not good if you
can't afford the upgrade.
The RGBsurface.transform method would be ideal, but I don't think it
was introduced until RB 5.5 or later.
You might want to look at something like the Monkeybread plugin,
which can do operations like this much faster, and is cheaper than an
RB upgrade. Alternatively write your own plugin, or use system
declares to access Quickdraw or Quartz.
Nick
On 30 Dec 2005, at 00:49, John Kubie wrote:
This more a question than a suggestion.
If you use drawpicture, you can scale one picture as it's drawn
onto another.
Perhaps, if you inverted the source range (x1>x1 or y1>y2) you
would get an inverted image?
Drawpicture shoould be much faster than going thru pixel-by-pixel.
Does this work?
John Kubie
On Dec 29, 2005, at 6:58 PM, Ben Farhner wrote:
Hi,
Okay, I have a thread that reverses an image. Heres the code:
for i=0 to p.width-1
for j=0 to p.height-1
c=r1.pixel(i,j)
r2.pixel(i,j)=rgb(255-c.red,255-c.green,255-c.blue)
progress.prog.value=progress.prog.value+1
next
progress.prog.value=progress.prog.value+1
next
The problem is, that takes over 8 seconds. Other programs, such as
Seashore, do it instantly. I'm using RGBSurfaces, which is
supposed to be faster, but is there a faster way? I'm on RB 5.2.4,
Mac OS X 10.4.3. Thanks,
Ben Farhner
CEO / Head Developer
farhnware
http://macware.byethost5.com
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