Re: Finder vs. Quartz performance.

FROM : Paolo Costabel
DATE : Wed Dec 22 23:10:58 2004

The window image is cached, that's why it renders fast. Rendering text
every frame is slow: try creating an image and render that instead.

Toby Smith wrote:

>I feel like there's a standard mantra of disclaimers to be made before a
>posting of this sort.  Yes, I have done some searching through the
>archives.  And yes, I have considered OpenGL.
>
>The Quartz API is beautiful.  It's exactly what I want.  I want perfectly
>rendered text, at any size, at any angle.  Transparency?  Yes, please.
>For text rendering, Quartz is far superior to OpenGL.
>
>But lord, it's dog slow, isn't it.
>
>Here's what I don't get.  I have an ancient G3 Mac running 10.3.  If I
>cobble up a bit of code with a single CGContextDrawImage() and a single
>CGContextShowTextAtPoint(), with an image that's 1024x768, I get a frame
>rate that's maybe 10fps.  If I add shadows to that text, I'm at about
>1fps.  Not exactly ready to ship.
>
>Now, on that same machine, whose monitor is 1280x1024, with a pretty
>little desktop image, I drag a window around, that window drags itself
>around just great, with a shadow, keeping up with the mouse with no
>problems.
>
>So what the dilly.  Does Finder use some API I'm not privy to?  Is there
>some magic CGContextDrawFaster() method or something?  Apple has such a
>great API with the Quartz stuff, but I feel like I'm missing some huge
>piece of the puzzle.  Or does the Finder use OpenGL, bypassing Quartz
>entirely?
>
>Regards,
>Tob
>
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