Re: Optimized pixel manipulation
Re: Optimized pixel manipulation
- Subject: Re: Optimized pixel manipulation
- From: "Christian Giordano" <email@hidden>
- Date: Wed, 8 Oct 2008 16:32:09 +0100
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
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