Предварительный просмотр изображения GPUImageStillCamera скачет при съемке фотографии
Я делаю квадратную обрезанную фотографию с GPUImageStillCamera и позволяя пользователю увеличить камеру. Когда пользователь щелкает, чтобы сделать снимок, камера прыгает вперед на доли секунды (как если бы камера увеличивалась еще дальше, за пределы области, в которую пользователь увеличил изображение, а затем сразу же возвращалась к правильному кадрированию, как только изображение возвращалось на экран). Это происходит только тогда, когда пользователь увеличил камеру. Если они не увеличивают камеру, мерцание / скачок не происходит. (Возвращаемое изображение имеет правильную обрезку независимо от того, увеличил ли пользователь масштаб или нет).
Мысли?
Создание камеры и добавление квадратной обрезки
//Add in filters
stillCamera = [[GPUImageStillCamera alloc] initWithSessionPreset:AVCaptureSessionPreset1280x720 cameraPosition:AVCaptureDevicePositionBack];
stillCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
//Creating a square crop filter
cropFilter = [[GPUImageCropFilter alloc] initWithCropRegion:CGRectMake(0.f, (720.0f/1280.0f)/2.0f, 1.f, (720.0f/1280.0f))];
Метод увеличения изображения
-(void)imagePinch:(UIPinchGestureRecognizer *)recognizer{ //Controlling the zoom scale as the user pinches the live preview
if (recognizer.state == UIGestureRecognizerStateBegan) {
zoomOutAdder = 0.0f;
if (currentScale > 2) {
zoomOutAdder = currentScale;
}
}
float addition = (recognizer.scale - lastScale);
if (addition > 0) {
addition = addition *1.7;
}
if (addition < 0) {
addition = addition *(1.7+zoomOutAdder);
}
currentScale = currentScale +addition;
lastScale = recognizer.scale;
if (currentScale < 1) {
currentScale = 1;
}
if (currentScale > 4) {
currentScale =4;
}
if (currentScale == 1) {
zoomOutAdder = 0.0f;
}
cameraImagePreview.transform = CGAffineTransformMakeScale(currentScale, currentScale);
if (recognizer.state == UIGestureRecognizerStateEnded) {
lastScale = 1.0f;
}
Сфотографируй метод
//Adjust crop based on zoom scale of the user
CGFloat zoomReciprocal = 1.0f / currentScale;
CGPoint offset = CGPointMake(((1.0f - zoomReciprocal) / 2.0f), (((1.0f- zoomReciprocal)*(720.0f/1280.0f)) / 2.0f) + ((720.0f/1280.0f)/2)) ;
CGRect newCrop = cropFilter.cropRegion;
newCrop.origin.x = offset.x;
newCrop.origin.y = offset.y;
newCrop.size.width = cropFilter.cropRegion.size.width * zoomReciprocal;
newCrop.size.height = cropFilter.cropRegion.size.height *zoomReciprocal;
cropFilter.cropRegion = newCrop;
*/
//Place photo inside an image preview view for the user to decide if they want to keep it.
[stillCamera capturePhotoAsImageProcessedUpToFilter:cropFilter withOrientation:imageOrientation withCompletionHandler:^(UIImage *processedImage, NSError *error) {
//Pause the current camera
[stillCamera pauseCameraCapture];
//Rest of method
ДОБАВЛЕННЫЕ МЕТОДЫ
- (void) flipCamera {
if (stillCamera.cameraPosition != AVCaptureDevicePositionFront) {
[UIView animateWithDuration:.65 animations:^{
flipCamera.transform = CGAffineTransformMakeScale(-1, 1);
}];
} else {
[UIView animateWithDuration:.65 animations:^{
flipCamera.transform = CGAffineTransformMakeScale(1, 1);
}];
}
[self performSelector:@selector(rotateCamera) withObject:0 afterDelay:.2];
}
- (void) rotateCamera {
[stillCamera rotateCamera];
//Adjust flash settings as needed
[stillCamera.inputCamera lockForConfiguration:nil];
if (stillCamera.cameraPosition != AVCaptureDevicePositionFront) {
[stillCamera.inputCamera setFlashMode:AVCaptureFlashModeOff];
}
NSAttributedString *attributedFlash =
[[NSAttributedString alloc]
initWithString:@"off"
attributes:
@{
NSFontAttributeName : [UIFont fontWithName:@"Roboto-Regular" size:13.0f],
NSForegroundColorAttributeName : [UIColor colorWithWhite:1 alpha:.55],
NSKernAttributeName : @(.25f)
}];
flashLabel.attributedText = attributedFlash;
[UIView animateWithDuration:.2 animations:^{
[flash setTintColor:[UIColor colorWithWhite:1 alpha:.55]];
}];
[stillCamera.inputCamera unlockForConfiguration];
}
- (void) changeFlash {
if (stillCamera.cameraPosition == AVCaptureDevicePositionFront) {//no flash available on front of camera
return;
}
[stillCamera.inputCamera lockForConfiguration:nil];
if (stillCamera.inputCamera.flashMode == AVCaptureFlashModeOff) {
[stillCamera.inputCamera setFlashMode:AVCaptureFlashModeOn];
[self animateFlashWithTintColor:[UIColor colorWithWhite:1 alpha:1] andString:@"on"];
} else if (stillCamera.inputCamera.flashMode == AVCaptureFlashModeOn) {
[stillCamera.inputCamera setFlashMode:AVCaptureFlashModeOff];
[self animateFlashWithTintColor:[UIColor colorWithWhite:1 alpha:.55] andString:@"off"];
}
[stillCamera.inputCamera unlockForConfiguration];
}
- (void) animateFlashWithTintColor:(UIColor *)color andString:(NSString *)text {
//Set new text
NSAttributedString *attributedFlash =
[[NSAttributedString alloc]
initWithString:text
attributes:
@{
NSFontAttributeName : [UIFont fontWithName:@"Roboto-Regular" size:13.0f],
NSForegroundColorAttributeName : [UIColor colorWithWhite:1 alpha:.55],
NSKernAttributeName : @(.25f)
}];
flashLabel.attributedText = attributedFlash;
float duration = .7;
[UIView animateKeyframesWithDuration:duration delay:0 options:0 animations:^{
[UIView addKeyframeWithRelativeStartTime:0 relativeDuration:duration animations:^{
[flash setTintColor:color];
}];
[UIView addKeyframeWithRelativeStartTime:0 relativeDuration:.7/duration animations:^{
flash.transform = CGAffineTransformMakeRotation(M_PI);
}];
}completion:^(BOOL finished){
flash.transform = CGAffineTransformIdentity;
}];
}
-(void) usePhoto {
if ([ALAssetsLibrary authorizationStatus] != ALAuthorizationStatusAuthorized){
NSLog(@"Do Not Have Right To Save to Photo Library");
}
//Save Image to Phone Album & save image
UIImageWriteToSavedPhotosAlbum(takenPhoto.image, nil, nil, nil);
//Save Image to Delegate
[self.delegate saveImageToDatabase:takenPhoto.image];
[self performSelector:@selector(dismissCamera) withObject:0 afterDelay:.4];
}
Некоторый дополнительный код, показывающий создание различных элементов камеры, используемых для захвата фотографии.
centerPoint = CGPointMake(self.view.frame.size.width/2, (cameraHolder.frame.size.height+50+self.view.frame.size.height)/2);
cameraImagePreview = [[GPUImageView alloc] initWithFrame:CGRectMake(0, 0, cameraHolder.frame.size.width, cameraHolder.frame.size.width)];
[cameraHolder addSubview:cameraImagePreview];
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageTouch:)];
[cameraImagePreview addGestureRecognizer:tapGesture];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(imagePinch:)];
[cameraImagePreview addGestureRecognizer:pinchGesture];
float scaleForView = self.view.frame.size.width/720.0;
fullCameraFocusPoint = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 1280*scaleForView)];
fullCameraFocusPoint.center = CGPointMake(cameraHolder.frame.size.width/2, (cameraHolder.frame.size.width/2)+50);
[self.view insertSubview:fullCameraFocusPoint atIndex:0];
takenPhoto = [[UIImageView alloc]initWithFrame:cameraHolder.frame];
takenPhoto.alpha = 0;
[self.view addSubview:takenPhoto];
//Add in filters
stillCamera = [[GPUImageStillCamera alloc] initWithSessionPreset:AVCaptureSessionPreset1280x720 cameraPosition:AVCaptureDevicePositionBack];
stillCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
//Creating a square crop filter
cropFilter = [[GPUImageCropFilter alloc] initWithCropRegion:CGRectMake(0.f, (720.0f/1280.0f)/2.0f, 1.f, (720.0f/1280.0f))];
//Create standard vignette filter
vignetteFilter = [[GPUImageVignetteFilter alloc] init]; //1
vignetteFilter.vignetteCenter = CGPointMake(.5, .5);
vignetteFilter.vignetteStart = 0.4f;
vignetteFilter.vignetteEnd = 1.08f;
//Add filters to photo
[cropFilter addTarget:vignetteFilter];
[stillCamera addTarget:cropFilter];
[vignetteFilter addTarget:cameraImagePreview];
[stillCamera startCameraCapture];