Hi Helder, I found this post that can be really helpful when I will have to do my pixel operations:
http://www.rodgutierrez.com/blog/2008/07/how-to-create-a-rgba-cgimagere.html I still have to find how to draw an CGImageRef in another one regardless the current context, I'm still wondering if this is the right approach. I will look better in the documentation. Thanks, chr On Thu, Sep 25, 2008 at 5:06 AM, Helder da Rocha <[EMAIL PROTECTED]> wrote: > 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 >>>> _______________________________________________ >>>> >>>> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >>>> >>>> Please do not post admin requests or moderator comments to the list. >>>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >>>> >>>> Help/Unsubscribe/Update your Subscription: >>>> >>>> >>>> http://lists.apple.com/mailman/options/cocoa-dev/cocoadev%40mikeabdullah.net >>>> >>>> This email sent to [EMAIL PROTECTED] >>>> >>> >>> >> >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> >> http://lists.apple.com/mailman/options/cocoa-dev/helder.darocha%40gmail.com >> >> This email sent to [EMAIL PROTECTED] >> >> > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
