How exactly to make a CGImageRef from an image on disk

Question

I\'ve looked around everywhere to no avail. I\'m doing some image loading in a thread and since UIKit is not thread safe I\'m going to have to store the images as CGImageRef

Answer 1

gcamp is more or less correct, you are pretty safe to use this on a background thread, but to answer your question, I believe the following would work.

CGDataProviderRef dataProvider = CGDataProviderCreateWithFilename("file");
CGImageRef image = CGImageCreateWithPNGDataProvider(dataProvider, NULL, NO, kCGRenderingIntentDefault);

There is also a function for jpg images, CGImageCreateWithJPEGDataProvider.

(be sure to release the data provider and image when done)

Answer 2

I think the simplest way is to use UIKit and use the CGImage propriety of UIImage.

Something like that :

UIImage* image = [UIImage imageNamed:@"Your Image.png"];
CGImageRef imageRef = image.CGImage;