Objevtive - C : Save zoomed caputre image from camera with GPUImage? - ios

Question

I have done zooming functionality in camera with GPUImage. But when I capture image from camera with zoom and save it but still it save as normal pict(no zooming found). I want in whichever mode I capture image that must be saved in album. How can I solve this problem Any suggestion will be great. Thanks guys. My code :
- (void)viewDidLoad {
[super viewDidLoad];
self.library = [[ALAssetsLibrary alloc] init];
[self setViewLayOut];
[self setupFilter];
[self setZoomFunctionlityOnCamera];
}
- (void)setupFilter;
{
videoCamera = [[GPUImageStillCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack];
videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
switch (filterType)
{
case GPUIMAGE_COLORINVERT:
{
self.title = #"Color Negative";
filter = [[GPUImageColorInvertFilter alloc] init];
};
break;
case GPUIMAGE_GRAYSCALE:
{
self.title = #"Black and White Positive";
filter = [[GPUImageGrayscaleFilter alloc] init];
};
break;
default: filter = [[GPUImageFilter alloc] init];
self.title = #"Color Positive";
break;
}
videoCamera.runBenchmark = YES;
filterView = (GPUImageView *)cameraView;
[filter addTarget:filterView];
[videoCamera addTarget:filter];
[videoCamera startCameraCapture];
}
- (IBAction)clickPhotoBtn:(id)sender {
if (!isCameraPermissionAccessed) {
[self showAccessDeinedMessage :#"Camera permission denied" withMessage:#"To enable, please go to settings and allow camera permission for this app."];
return;
}
[videoCamera capturePhotoAsJPEGProcessedUpToFilter:filter withCompletionHandler:^(NSData *processedJPEG, NSError *error){
if (error!=nil)
{
[self showErrorMessage:#"Unable to capture image" ];
return ;
}
else {
UIImage *image = [UIImage imageWithData:processedJPEG];
if (filterType == GPUIMAGE_GRAYSCALE) {
GPUImagePicture *stillImageSource = [[GPUImagePicture alloc] initWithImage:image];
GPUImageColorInvertFilter *stillImageFilter = [[GPUImageColorInvertFilter alloc] init];
[stillImageSource addTarget:stillImageFilter];
[stillImageFilter useNextFrameForImageCapture];
[stillImageSource processImage];
UIImage *currentFilteredVideoFrame = [stillImageFilter imageFromCurrentFramebuffer];
UIImageWriteToSavedPhotosAlbum(currentFilteredVideoFrame, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
}
else{
UIImageWriteToSavedPhotosAlbum(image, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
}
}
}];
}

Answer 1

Use below code it may helpful to you
+(UIImage*)croppedImageWithImage:(UIImage *)image zoom:(CGFloat)zoom
{
CGFloat zoomReciprocal = 1.0f / zoom;
CGPoint offset = CGPointMake(image.size.width * ((1.0f - zoomReciprocal) / 2.0f), image.size.height * ((1.0f - zoomReciprocal) / 2.0f));
CGRect croppedRect = CGRectMake(offset.x, offset.y, image.size.width * zoomReciprocal, image.size.height * zoomReciprocal);
CGImageRef croppedImageRef = CGImageCreateWithImageInRect([image CGImage], croppedRect);
UIImage* croppedImage = [[UIImage alloc] initWithCGImage:croppedImageRef scale:[image scale] orientation:[image imageOrientation]];
CGImageRelease(croppedImageRef);
return croppedImage;
}