cgimage

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Most efficient method of loading a smaller representation of an image

I want to load a thumbnail representation of an image that is located in the Documents directory. If I were just using the Camera Roll I could use the Assets Library Framework to do this. With movie[详细]

2023-02-09 02:05 分类：问答
iPhone CALayer image array contents values

The way to load image to the layer is simply this: CALayer *layer = [[CALayer alloc]init]; layer.conten开发者_如何学运维ts = (id) [UIImage imageNamed:@\"image.png\"].CGImage;[详细]

2023-02-07 13:45 分类：问答
What could be the cause of this error with CGBitmapContextCreate()?

My application gives these errors on the console: <Error>: CGBitmapContextCreateImage: invalid context 0xdf12000[详细]

2023-02-07 08:41 分类：问答
Correct way to release a UIColor PatternImage

I have a few, full screen, UIColor PatternImages (in scrollViews) in my iPad app and am experiencing some memory problems (surprise?)[详细]

2023-02-06 10:55 分类：问答
Segment a CGImage

In iOS 4.0 and later is there a way to segment a CGImage without loading the entire image into memory? What I am attempting to do is * programmatically* segment an image for use in a CATil开发者_高级运[详细]

2023-02-05 04:30 分类：问答
Store CGImageRef in a NSDictionnary

My app is using a set of CGImageRef and I am wondering how to store them in an NSMutableDictionary in order to avoid memory leakes (How to transform them into NSObject and how to CFRelease properly)[详细]

2023-02-02 17:30 分类：问答
show image in a CGContextRef

What i am doing, i downloded a code for calender now i want to show images on its tiles(for date). What i am trying shows in code[详细]

2023-02-01 20:50 分类：问答
When to release the UIImage?

I use the following code to draw a subimage UIImage* subIm = getSubImage( large, rect ); [subIm drawInRect:self.bounds];[详细]

2023-02-01 05:20 分类：问答
CGImage, NSArray and Memory

This is a multiple part question, mostly because my ignorance on the matter has multiple layers. First, I put together a caching system for caching CGImageRef objects. I keep it at the CGImageRef lev[详细]

2023-01-31 23:23 分类：问答
how should i be considering CGImageAlphaInfo when converting to JPEG?

i\'m handing off to this method and using the resultant CGImageRef adding it to a CGImageDestinationRef that is setup for finalizing as a kUTTypeJPEG:[详细]

2023-01-31 16:41 分类：问答