cgimage

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iphone UIImage resize by endpoints

I want resize the shapes draw on context by picking their endpoints. And also rotate it with its endPoints. Can anybody suggest me how can I do this with proper example?[详细]

2023-04-11 23:37 分类：问答
Can I use CGDataProviderCreateSequential() to read in the data of a CGImageRef sequentially?

Is it possible to use CGDataProviderCreateSequential() and CGDataProviderSequential开发者_运维百科Callbacks to read the data in from a CGImageRef sequentially?[详细]

2023-04-11 05:00 分类：问答
New CALayer.contents does not display until view is resized

I have a CALayer that needs to display frames of video. Every time a frame is rendered (as a CGImageRef), this method is called:[详细]

2023-03-30 04:14 分类：问答
UIImage/CGImage changing my pixel color

I have an image that is totally white in its RGB components, with varying alpha -- so, for example, 0xFFFFFF09 in RGBA format.But when I load this image with either UIImage or CGImage APIs, and then d[详细]

2023-03-29 02:19 分类：问答
Camera Overlay with User-Photo not saving as edited

I am using a transparent image with a cut out for a user to insert / take their own image. For some reason, while using the UIImagePickerControllerEditedImage and cropping the 开发者_开发问答user-take[详细]

2023-03-28 13:06 分类：问答
What does a correct call to CGImageCreate look like if the data provider for it uses an array created by the app?

I\'m trying to create a bitmap in memory as part of a pattern function that a drawLayer:inContext: method (this method is part of the CALayer delegate protocol) will call. The pattern function looks s[详细]

2023-03-27 07:45 分类：问答
CGImage/UIImage passing causes EXE-BAD-ACCESS

FIXED: I\'开发者_StackOverflow中文版m not sure yet why. Code has been updated below, and notes at the bottom[详细]

2023-03-26 20:43 分类：问答
Image is rotated 90 degrees when using clipToMask

I am trying to clip a portion of an image I take with a camera. Here\'s my clipping code: - (UIImage*) maskImage:(UIImage *)image {[详细]

2023-03-23 07:03 分类：问答
color balance on the iPhone

I am taking an image, loading it via the screen context, and changing it pixel by pixel.I have a number of different filters that I am applying to the images, but the last thing I need to do is shift[详细]

2023-03-22 15:04 分类：问答
Getting fullScreenImage from ALAssetRepresentation on background thread

I need to populate a number of UIImageView instances (about 10) with UIImage instances from ALAssets. I don\'t want to lock up the main thread while doing that so want to do as much as possible in a b[详细]

2023-03-14 23:44 分类：问答