Hi Taras,
I believe I explained the cause in my other message (attached).
To sum it up, copying large image from system memory to the
screen using our GDI blit loops can be slow in some cases
depending on the dimensions of the image.
Thanks,
Dmitri
[EMAIL PROTECTED] wrote:
Dmitry,
After running for a day with the "grey rect fix" disabled, I can confirm that
it solves my problem.
Is there anything I can do to diagnose why the "grey rect fix" causes such
extremely bad mousewheel scrolling performance on my system?
Thanks for your help,
Taras
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Hi Taras,
[EMAIL PROTECTED] wrote:
Dmitry,
I have tried enabling Java2D DirectDraw pipeline. Results were a mixed bag - in
some cases it seems to help, in other cases not at all.
OK.
Not really relevant to the discussion, but one thing is that
with the hw acceleration unconditionally disabled IntelliJ
will miss the new fully hw-accelerated Direct3D pipeline
to be introduced soon in 6 update release.
I have tried your second suggestion, and so far it seems to work! (at least in
my configuration).
I am not very familiar with Java2D acceleration, but
-Was the 'grey rect' fix introduced in Mustang? That would explain why the
problem does not manifest on JRE 1.5
Yes, the 'gray rect' fix was introduced in Mustang.
The difference between 5.0 and 6.0 (with respect to the gray
rect fix) is that in 5.0 the scrolling happens on the screen:
first a copyArea is done on the screen surface, then Swing
repaints the exposed area to the back-buffer (or, rather,
a scratch buffer), which is then copied to the screen.
In 6.0 with the gray rect fix it all happens in the back-buffer:
both the copyArea and the repainting of the newly exposed
area. Then the back-buffer is copied to the screen.
With HW acceleration disabled this back-buffer is just a
BufferedImage, so copyArea operation for large regions
may be slower than on-screen scroll operation we had
in 5.0 (which was handled through GDI and thus was hw
accelerated in most cases).
And a copy from the back-buffer to the screen - and such
a copy after a large scroll could be pretty big - (which is
handled through our GDI blit loops) could be rather slow in
some cases like if the dimensions of the image being copied
are not dword aligned (scan line is not a multiple of 4).
In this latter case the blit happens scan line by scan line,
which is slow (I think there's a bug filed on that).
-IDEA opens a new top-level frame for each open project. Does the 'grey-rect'
fix perhaps (try to) allocate VRAM for each non-foreground frame - and because
of that remaining VRAM amount may get quite small, slowing down drawing
operations?
I don't think that's a problem - especially since you're
having issues even with hw acceleration disabled.
Thanks,
Dmitri
I have not tested this fully yet. But I will do so, and report the results here.
For now: thanks for your quick feedback.
Taras
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