After drawing the shapes, I do pixel operations, of course. For this reason I create a bitmap context and after the drawing I get the CGImageRef generated, I copy the pixels, I modify the pixels and then I create a new image with those that will be drawn in the UIView context.
Cheers, chr On Wed, Oct 8, 2008 at 4:58 PM, Jean-Daniel Dupas <[EMAIL PROTECTED]> wrote: > I do not understand. > If you just want to display some shapes and images, you don't need to draw > into a bitmap, you just need to draw in your view. > What do you mean by "creating a context". All views already have a context > where you can draw whatever you want. > > Le 8 oct. 08 à 17:43, Christian Giordano a écrit : > >> At the moment I'm starting creating a context and drawing basic >> shapes, is there another way to draw basic shapes on a bitmap? >> >> Cheers, chr >> >> >> On Wed, Oct 8, 2008 at 4:32 PM, Christian Giordano >> <[EMAIL PROTECTED]> wrote: >>> >>> I started questioning myself if maybe I need something else, but >>> clearly I have no idea which other options I have. Maybe using OpenGL >>> (ES)? The ultimate aim is of course to renderer the result of all the >>> manipulation, at the moment this happens in a UIView.drawRect. >>> >>> Cheers, chr >>> >>> >>> On Wed, Oct 8, 2008 at 4:25 PM, Jean-Daniel Dupas >>> <[EMAIL PROTECTED]> wrote: >>>> >>>> CGImage does not provide an efficient way to update , but maybe CGImage >>>> is >>>> not what you want. >>>> Where your image come from, why do you need a CGImageRef and what are >>>> you >>>> trying to do with it ? >>>> >>>> >>>> Le 8 oct. 08 à 17:01, Christian Giordano a écrit : >>>> >>>>> I'm modifying frequently the pixels of the images, the way I found is >>>>> creating a copy of the data >>>>> (CGDataProviderCopyData(CGImageGetDataProvider(image));) modify the >>>>> pixels and then create a new one. I'm facing performance issues and I >>>>> fear that all this allocating and deallocating is not helping. Is >>>>> there a way I could have access and modify the pixels of a CGImage >>>>> without copying them? >>>>> >>>>> Thanks, 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/devlists%40shadowlab.org >>>>> >>>>> 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/devlists%40shadowlab.org >> >> 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]
