[gs-devel] Poor shading performance (shfill)

[Jeong Kim]

This mail was rejected by gs-devel-admin. I am re-sending this one.

> -----Original Message-----
> From: gs-devel-admin at ghostscript.com 
> [mailto:gs-devel-admin at ghostscript.com]On Behalf Of Jeong Kim
> Sent: Friday, April 11, 2003 12:42 AM
> To: gs-devel at ghostscript.com
> Subject: [gs-devel] Poor shading performance.
> 
> 
> When rendering the attached file, gs consumes so much time.
> Following is the command line I used and time table.
> 
> bin\gswin32c -I.lib -sDEVICE=tiff24nc -sOutputFile=temp.tif -dEPSCrop
> -r72 -dNOPAUSE -dBATCH c:\shade.eps
> 
> 36 dpi		0:24sec
> 72 dpi		1:40
> 150 dpi		7:23
> 300 dpi		20:47
> 
> The code calls 96 shfills and it takes most of time. A profiling result
> says that
> filling trapezoids is the problem. If I change 1 to 0 in the following
> line, the
> time is greatly reduced.
> 
> #define PSEUDO_RASTERIZATION (DROPOUT_PREVENTION && 1) /* Change 1 to 0
> for benchmarking. */
> 
> Now I am conducting a benchmark for CPSI, Jaws and Ghostscript.
> For this file, CPSI and Jaws processes in a few seconds.
> I will post whole benchmark results in this week.
> 
> Thanks,
> 
> Jeong
> 
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