RE: performance issues

• Subject: RE: performance issues
• From: "Edwards, Waverly" <email@hidden>
• Date: Wed, 30 Mar 2005 16:12:23 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden
• Thread-index: AcU1Io9cSPdTo2luS5eo6LcgImA4rgASiXWQ
• Thread-topic: performance issues

-----Original Message-----
From: Jan E. Schotsman [mailto:email@hidden]
Sent: Wednesday, March 30, 2005 7:18 AM
To: email@hidden
Cc: Edwards, Waverly
Subject: Re: performance issues

On 30-mrt-05, at 1:46, Edwards, Waverly wrote

OK, here is the BIG kicker, step 4 (first list). The entire process including displaying

the data in quartz takes 88 minutes. It *is* scaled to fit on the screen and yes

it is a stress test however I can not escape the fact that drawing is much too

slow in quartz. The drawing portion little more than:

loop

// get next batch of cgPointArray and add them to path

cgcontextbeginpath( ctx )

cgcontextaddlines( ctx, cgPointArray, numLines )

cgcontextstrokepath( ctx )

endLoop

:

This reminds me of people complaining SetCPixel is so slow.

Are you drawing an image? I f you create a CGImage you can write data to its backbuffer and use CGContextDrawImage to display the image.

Jan.

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