Since you can't use NSImage, you could try Core Image.
You can do all that with CGImage in your restricted environment. You can
use a bitmap or layer context and then later render it on whatever view
you wish.
There is a good Core Graphics Quartz tutorial at
http://developer.apple.com/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_intro/chapter_1_section_1.html
Helder.
--
Helder da Rocha ([EMAIL PROTECTED])
Sao Paulo, Brazil
Christian Giordano wrote:
Thanks Mike, I can't use NSImage (guess why) but a subset. Btw, the
problem I have is that I have a view which contains an image. I would
like to draw in the image, not in the container view so I need to
provide to the draw method the image context. Is this a good approach
or all the drawing should happen in the view context? Should I extend
the image view and handle the routing internally?
Thanks, chr
On Wed, Sep 24, 2008 at 11:08 AM, Mike Abdullah
<[EMAIL PROTECTED]> wrote:
On 24 Sep 2008, at 10:50, Christian Giordano wrote:
Hi guys, is there some good tutorial around about how to manipulate
bitmaps in Cocoa?
I would be interested on:
- copy portion of image over another with a mask (this should be
pretty straight forward with quartz2d)
[[NSImage alloc] initWithSize:]
[image lockFocus]
[sourceImage drawAtPoint:point fromRect:imagePortionRect operation:operation
fraction:1.0]
[image unlockFocus]
- apply threshold
- apply effects like blur
Core Image is your friend
Not sure if some of this, like the blur, is recommended to do from an
higher level instead of doing it pixel by pixel. In case of the
latter, how to get the bytearray with all the pixels info?
Thanks a lot, chr
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