core-image

来源： https://stackoverflow.com/questions/57826691/how-to-limit-gcd-queue-buffer-size

来源： https://stackoverflow.com/questions/57826691/how-to-limit-gcd-queue-buffer-size

问题 I'm trying to generate QR code with following code : DispatchQueue.main.async { let image = generateQRCode(from: qrCodeString) } func generateQRCode(from string: String?) -> UIImage? { if let data = string?.data(using: .utf8, allowLossyConversion: false) { if let filter = CIFilter(name: "CIQRCodeGenerator") { filter.setValue(data, forKey: "inputMessage") let transform = CGAffineTransform(scaleX: 5, y: 5) if let output = filter.outputImage?.transformed(by: transform) { return UIImage(ciImage:

问题 I have CVPixelBufferRef from an AVAsset . I'm trying to apply a CIFilter to it. I use these lines: CVPixelBufferRef pixelBuffer = ... CVPixelBufferRef newPixelBuffer = // empty pixel buffer to fill CIContex *context = // CIContext created from EAGLContext CGAffineTransform preferredTransform = // AVAsset track preferred transform CIImage *phase1 = [CIImage imageWithCVPixelBuffer:pixelBuffer]; CIImage *phase2 = [phase1 imageByApplyingTransform:preferredTransform]; CIImage *phase3 = [self

问题 I have CVPixelBufferRef from an AVAsset . I'm trying to apply a CIFilter to it. I use these lines: CVPixelBufferRef pixelBuffer = ... CVPixelBufferRef newPixelBuffer = // empty pixel buffer to fill CIContex *context = // CIContext created from EAGLContext CGAffineTransform preferredTransform = // AVAsset track preferred transform CIImage *phase1 = [CIImage imageWithCVPixelBuffer:pixelBuffer]; CIImage *phase2 = [phase1 imageByApplyingTransform:preferredTransform]; CIImage *phase3 = [self

问题 I have CVPixelBufferRef from an AVAsset . I'm trying to apply a CIFilter to it. I use these lines: CVPixelBufferRef pixelBuffer = ... CVPixelBufferRef newPixelBuffer = // empty pixel buffer to fill CIContex *context = // CIContext created from EAGLContext CGAffineTransform preferredTransform = // AVAsset track preferred transform CIImage *phase1 = [CIImage imageWithCVPixelBuffer:pixelBuffer]; CIImage *phase2 = [phase1 imageByApplyingTransform:preferredTransform]; CIImage *phase3 = [self

问题 Thanks for reading. I'm trying to use CoreImage in iOS 5 to alter the appearance of an image. The problem is that the existing image appears to lose its orientation information during the process and ends up rotated by 90 degrees. Here is the code: CIContext *context = [CIContext contextWithOptions:nil]; CIImage *img = [CIImage imageWithCGImage:imageView.image.CGImage]; CIFilter *adjustFilter = [CIFilter filterWithName:@"CIHighlightShadowAdjust"]; [adjustFilter setDefaults]; [adjustFilter

问题 Thanks for reading. I'm trying to use CoreImage in iOS 5 to alter the appearance of an image. The problem is that the existing image appears to lose its orientation information during the process and ends up rotated by 90 degrees. Here is the code: CIContext *context = [CIContext contextWithOptions:nil]; CIImage *img = [CIImage imageWithCGImage:imageView.image.CGImage]; CIFilter *adjustFilter = [CIFilter filterWithName:@"CIHighlightShadowAdjust"]; [adjustFilter setDefaults]; [adjustFilter

问题 Thanks for reading. I'm trying to use CoreImage in iOS 5 to alter the appearance of an image. The problem is that the existing image appears to lose its orientation information during the process and ends up rotated by 90 degrees. Here is the code: CIContext *context = [CIContext contextWithOptions:nil]; CIImage *img = [CIImage imageWithCGImage:imageView.image.CGImage]; CIFilter *adjustFilter = [CIFilter filterWithName:@"CIHighlightShadowAdjust"]; [adjustFilter setDefaults]; [adjustFilter

问题 I'm using GPUImage framework of Brad Larson in my app and I need to make a mask of mask.jpg and photo. So mask images are two colors images with black background and white geometric figure. So basically masking is working, the problem is that I can't make the transparency of mask. To make that I need to replace the black color of mask.png to lighter color (more gray to white). So I tried to use code from here Want to change a particular color inside an image with another color - iPhone But it