Re: Draw Performance Improvement
- From: Manish <Manish@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 8 Jan 2006 16:39:02 -0800
Thanks for giving me good points to think.
But i request you to please tell me which part of the program i should
modify ..if i have to increase the buffer size used for GDI operation ,i want
to check how much does it really impact performance by increasing buffer
size.
I hope you underrstand my question.
Regards
Manish
"Gary Daniels [MS]" wrote:
> The best place to start investigating performance issues is to profile your
> application, there's info in the PB documentation on using the profiler.
>
> With graphics, the biggest performance hit is normally color conversion.
> Make sure all of your bitmaps have matching color formats, use
> CreateCompatibleBitmap whenever possible, and create your DIB's with the
> same bit depth and bit masks as the primary display driver. Hardware
> acceleration usually only works with bitmaps from CreateCompatibleBitmap,
> bitmaps from CreateBitmap and CreateDIBSection are stored in system memory
> and not the display card's video memory. For the display hardware to
> accelerate bitmaps in system memory addtional hardware/dma is needed.
>
> Complex clip regions are also a cluprit, keep in mind that performance
> decreases exponentially as the number of clipping rectangles increase for
> the surface. All of the clipping rectangles need to be tested for each pixel
> blitted, resulting in a large perf hit.
>
> These are just some initial places to look, but i've found the best thing to
> do is profile and see where the cycles are actually going.
>
> Gary Daniels
> Windows CE Multimedia and Graphics
>
> This posting is provided "AS IS" with no warranties, and confers no rights.
> You assume all risk for your use.
>
> "Dean Ramsier" <ramsiernospam@xxxxxxxxxx> wrote in message
> news:eQ%23mR8sEGHA.3464@xxxxxxxxxxxxxxxxxxxxxxx
> > There are a number of things that can influence your display performance.
> > Chief among them is the ability of the display controller to do hardware
> > acceleration of the various blits. Just increasing video memory size
> > won't do a thing, unless you have a controller that has onboard video
> > memory, and can do surface flipping etc in hardware.
> >
> > Keep in mind that your perception of poor video performance might have
> > little or nothing to do with the display driver. You could have overall
> > poor performance resulting from any number of system level issues.
> >
> > --
> > Dean Ramsier - eMVP
> > BSQUARE Corporation
> >
> >
> > "Manish" <Manish@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> > news:B3F75A9A-DCB4-4712-8A73-44F0EFDBC3DE@xxxxxxxxxxxxxxxx
> >> Hi !
> >> I am runing one application on My device which is veryGUI
> >> intensive
> >> therefore the performance of Draw function is not good . It takes
> >> appricial
> >> time . I want to improve performance . Somebody told me to increase the
> >> Video
> >> Memory buffer size .
> >>
> >> Can anybody tell me where i need to make changes in BSP ..In Display
> >> driver
> >> /DirecDraw display driver or else .
> >>
> >>
> >> Please suggest
> >>
> >> Regards
> >> Manish
> >
> >
>
>
>
.
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