Re: jpeGS woes

[bazyar@hypermall.com (Jawaid Bazyar)]

Steven Nelson (snelson@news.uiowa.edu) wrote:
: From article <4fohmd$eo@urvile.msus.edu>, by schefflr@news.msus.edu (Bill Scheffler):
: > 
: > 	Extraced fine for me.  Works with the three Jpegs I tried it with 
: > except it was slllllllllllooooowwwwww.......yeow!  The only plus is that 
: > it does color and I'm willing to wait 10 minutes for a color jpeg on my 

: I timed a jpeg on my MacLC and Rom1GS 8/64 ZipGS with 4Meg RamGS.  The MacLC
: is very basic.  No extra video ram, 4Meg Ram, 12 RGB monitor (256 colors,
: 512 x 384 pixels) System 7.0.  Jpegview3.3 was MacLC viewer.
: Parrot JPEG from the Jpegview3.3 package.  jpeGS used integer math option.

: Both viewers set to display after opening.
:                                                     No SecondSight
: Open to finish display            MacLC           IIGS Rom1 Zip8/84
:                                Jpegview 3.3           jpeGS v1.0

:                                   <20 secs             9 min 33 secs
:                                  256 color pic          16 color pic

: Thus, jpeGS was over 25 times slower than the MacLC/Jpegview3.3 combo.

: jpeGS needs at least a 20x speedup.  50-100 x speedup would be nice.
: A jpeg viewer on a accelarated GS SHOULD be faster than a MacLC product.

  That would be nice - *however* keep in mind some of the inherent
limitations of the 65816 processor. It has no built-in multiply instruction,
and JPEG can perform *millions* of 16 and 32-bit multiplies for each
picture.  And if you want really fast multiplies, you need some
hardware.  A version of JPEG that used floating-point multiplies
and worked with an FPE would probably actually be *faster* than
using software-based integer math.
  I'm looking for an FPE to buy, BTW.

: Does a SecondSight board speedup or slow down jpeGS?

  There's less work to do with Second Sight.

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