Re: Core Graphics: Is it better to up-sample or down-sample images when drawing into a rect?
Re: Core Graphics: Is it better to up-sample or down-sample images when drawing into a rect?
- Subject: Re: Core Graphics: Is it better to up-sample or down-sample images when drawing into a rect?
- From: Jeff Szuhay <email@hidden>
- Date: Wed, 24 Aug 2016 20:37:59 -0700
> On Aug 24, 2016, at 8:02 PM, Britt Durbrow <email@hidden> wrote:
>
>
>> On Aug 24, 2016, at 12:59 PM, Jeff Szuhay <email@hidden> wrote:
>>
>> I draw my images (clocks) into a “reference” sized rectangle—for simplified position calculations—and then have CoreGraphics scale into the destination view rect.
>
> Don’t do that with bitmap scaling. It’s wasteful, and will look bad.
>
> Instead, create the bitmap at the correct size for it’s destination; and use the drawing matrix transform functions (scale, translate, rotate, etc) to set up your drawing environment.
Okay, so when the user changes the clock size (it’s destination), then recreate the bitmap to the new size and redraw everything at the new scale?
_______________________________________________
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