cgimage

I'm trying to build a QRCodeReader for a project our research group is working on for the iPhone. After much research I found the program called QuickMark . This program scans automatically for QRCodes. What it appears to do is load the UIImagePicker and read off data from the camera. I suspect it is using UIGetScreenImage and taking a screenshot from the camera and decoding it. Now I tried using the new takepicture() method from the 3.1 iPhone API but that seems not to be able to do what the above does which is take photos every second or so, silently. Now I had heard that UIGetScreenImage is

I am having an issue using CGBitmapContextCreateImage in my iPhone app. I am using AV Foundation Framework to grab camera frames using this method: - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); CVPixelBufferLockBaseAddress(imageBuffer,0); uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer); size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); size_t width =

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 CGImageRefs but I can't figure out how to do this. I haven't played with any of the Quartz stuff before so it's confusing me. Basically I just need to load a JPG from the disk into a CGImageRef. Also for bonus points, is there anyway to load a GIF into a CGImageRef? Jerry Jones 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.

Is there an easy way to do this that works in 10.5? In 10.6 I can use nsImage CGImageForProposedRect: NULL context: NULL hints: NULL If I'm not using 1b black and white images (Like Group 4 TIFF), I can use bitmaps, but cgbitmaps seem to not like that setup... Is there a general way of doing this? I need to do this because I have an IKImageView that seems to only want to add CGImages, but all I've got are NSImages. Currently, I'm using a private setImage:(NSImage*) method that I'd REALLY REALLY rather not be using... Found the following solution on this page : NSImage* someImage; // create the

I have a PNG image that has an unsupported bitmap graphics context pixel format. Whenever I attempt to resize the image, CGBitmapContextCreate() chokes on the unsupported format I receive the following error (error formatted for easy reading): CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component colorspace; kCGImageAlphaLast; 1344 bytes/row. The list of supported pixel formats definitely does not support this combination. It appears I need to redraw the image and move the alpha channel information to kCGImageAlphaPremultipliedFirst or

I've been trying to figure out how to convert an array of rgb pixel data to a UIImage in Swift. I'm keeping the rgb data per pixel in a simple struct: public struct PixelData { var a: Int var r: Int var g: Int var b: Int } I've made my way to the following function, but the resulting image is incorrect: func imageFromARGB32Bitmap(pixels:[PixelData], width: Int, height: Int)-> UIImage { let rgbColorSpace = CGColorSpaceCreateDeviceRGB() let bitmapInfo:CGBitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedFirst.rawValue) let bitsPerComponent:Int = 8 let bitsPerPixel:Int = 32 assert(pixels