Re: Optimized pixel manipulation
Re: Optimized pixel manipulation
- Subject: Re: Optimized pixel manipulation
- From: "Christian Giordano" <email@hidden>
- Date: Wed, 8 Oct 2008 16:43:24 +0100
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@hidden> 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@hidden> 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 (email@hidden)
>>>
>>> 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:
>>>
>>> This email sent to email@hidden
>>>
>>
>>
>
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden