On Dec 29, 2005, at 3:58 PM, Ben Farhner wrote:
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,
This example is a perfect use of the Transform() method of
RGBSurface. The Language Reference describes this well enough, so I
won't. =)
BTW, the ProgressBar code is probably slowing up the transformation
more than the actual transformation... for future reference, it would
be better to only update the ProgressBar in the outer loop. But
since Transform will work much faster, you don't even need a progress
bar.
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