Re: Drawing with CIImages (was "again with paths and images")
Re: Drawing with CIImages (was "again with paths and images")
- Subject: Re: Drawing with CIImages (was "again with paths and images")
- From: Michael Watson <email@hidden>
- Date: Thu, 21 Dec 2006 15:02:41 -0500
Clarification on my post just now:
I did know these were there, but I didn't know I could draw CIImages
into places other than NSImages.
--
m-s
On 21 Dec, 2006, at 14:12, douglas a. welton wrote:
The ones documented here:
<http://developer.apple.com/documentation/Cocoa/Reference/
ApplicationKit/Classes/CIImage_AppKitAdditions/index.html#//
apple_ref/doc/uid/TP40003998>
On Dec 21, 2006, at 2:07 PM, Roland Torres wrote:
Hmm, what -draw... methods are there for CIImage? A look in
CIImage.h shows none, nor does the documentation list any. It
would be too good to be true. ;-)
Roland
On Dec 21, 2006, at 10:59 AM, douglas a. welton wrote:
Are you doing anything with the resulting NSImage other than
drawing it (e.g., archiving or using other NSImageReps)?
If not, I'd just use CIImage's -draw... methods and be done with it.
later,
douglas
On Dec 21, 2006, at 1:34 PM, Michael Watson wrote:
Speaking of drawing CIImages into views, currently I'll create
my CIImage, draw it into an NSImage, and then use the NSImage in
whatever view I'm drawing into.
I suspect I may be doing more work than is necessary to use
CIImages. Any tips from the crowd?
--
m-s
On 21 Dec, 2006, at 12:39, douglas a. welton wrote:
Your situation seems like a perfect fit for using Core Image.
Create a CIImage, draw it into the first view, then apply a the
crop and scale CIFilters (CICrop & CILanczosScaleTransform )
and draw the image into the second view. All the work gets
done on the GPU, roughly in realtime.
regards,
douglas
On Dec 21, 2006, at 6:13 AM, Livio Isaia wrote:
Skip this if you have no time to loose!
I know that my problem seems a bit strange, if not silly, but
here's the reason why.
I have two views into which I draw the same image: in the
first one at normal size, in the second in a scaled size
(bigger) so that the user can clearly see each image pixel.
Practically a pixel in the first view will become a 6x6 rect
in the second one.
Now, if I draw a bezier path (let's say an oval one, for
example) in the first, I want it to be drawn also in the
second, but here pixels will become rects, and if I use a
scaling transformation I'll get a bigger oval but not a
sequence of rects. Hope it's clear...
That's why I thought to draw it all in one image and then draw
it in a bigger rect (after all the final result will be a
single image...). Of course it' not a great solution, and it's
expensive in terms of time and memory.
I tried to calculate the path rects using formulas but with no
exciting results (do you know where to find the formulas used
in bezier paths?).
So any idea will be apreciated!
Thanks again to everybody,
livio.
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