Mr Haerr
> No, I think we need to be completely accurate.
I agree it.
> This divide is not the performance problem in the drawing loop, it is the
> execution of the switch() statement.
But, I have different opinions on that issue.
- The every pixel is divided by 255 in the drawing loop. ( alphablend case )
- In case ARM, ARM core do not support hardware for division. Instead, compiler
implement a division by calling software routine in C library. The standard
integer division routine supported by C library takes 20~100 cycle. It depens
on ARM processor family.
Anyway, I agree that an accuracy is the most important , too.
Regards,
Sung Joo
-----Original Message-----
From: "Greg Haerr"<g...@censoft.com>
To: "Sung Joo, Byun"<nh...@naver.com>
Cc: nanogui@linuxhacker.org
Sent: 10-03-12(금) 14:17:51
Subject: Re: [nanogui] Re: Re: [FIX] add alpha channel into GdDrawImage
software handling
: How about changing from (color/255) to (color>>8) in GdDrawImage() ?
:
: Although it is not an accurate value, but it has the advantage of
performance.
No, I think we need to be completely accurate. This
divide is not the performance problem in the drawing
loop, it is the execution of the switch() statement.
Regards,
Greg
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