I think I found what to do. I need to create a bitmap context from the bitmap and drawing there. It makes sense that everything drawn is handled by contexts of course, I'm just a bit concerned about performances.
Thanks, chr On Thu, Sep 25, 2008 at 7:35 AM, Christian Giordano <[EMAIL PROTECTED]> wrote: > 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]
