how to handle Image rotation issue in IOS image cropping - ios

Question

I am working on camera related app.Here I am taking image from camera and need to crop it and later fix that to image view.For cropping the image I am using OpenGL.My problem is I am after cropping the image is getting rotated 180 degrees.But this is not happening all the time.Some times I am getting the original image itself.
-(void)showResult
{
NSLog(#"showResult called" );
UIImage *imageCrop;
float scaleCrop;
if (_sourceImage.size.width >= IMAGEWIDTH)
{
scaleCrop = IMAGEWIDTH / _sourceImage.size.width;
imageCrop = [ImageCropViewController scaleImage:_sourceImage with:CGSizeMake(_sourceImage.size.width*scaleCrop, _sourceImage.size.height*scaleCrop)];
}
else
{
scaleCrop = 1;
imageCrop = _sourceImage;
}
float scale = _sourceImage.size.width / resizeImage.size.width * 2;
IplImage *iplImage = [ImageCropViewController CreateIplImageFromUIImage:imageCrop] ;
Quadrilateral rectan;
rectan.point[0].x = _touchLayer.rectan.pointA.x*scale*scaleCrop;
rectan.point[0].y = _touchLayer.rectan.pointA.y*scale*scaleCrop;
rectan.point[1].x = _touchLayer.rectan.pointB.x*scale*scaleCrop;
rectan.point[1].y = _touchLayer.rectan.pointB.y*scale*scaleCrop;
rectan.point[2].x = _touchLayer.rectan.pointC.x*scale*scaleCrop;
rectan.point[2].y = _touchLayer.rectan.pointC.y*scale*scaleCrop;
rectan.point[3].x = _touchLayer.rectan.pointD.x*scale*scaleCrop;
rectan.point[3].y = _touchLayer.rectan.pointD.y*scale*scaleCrop;
IplImage* dest = cropDoc2(iplImage,rectan);
IplImage *image = cvCreateImage(cvGetSize(dest), IPL_DEPTH_8U, dest->nChannels);
cvCvtColor(dest, image, CV_BGR2RGB);
cvReleaseImage(&dest);
tempImage = [ImageCropViewController UIImageFromIplImage:image withImageOrientation:_sourceImage.imageOrientation];
[self crop:tempImage];
cvReleaseImage(&image);
}
After that the below method is called
+ (UIImage *)UIImageFromIplImage:(IplImage *)image withImageOrientation:(UIImageOrientation)orientation
{
NSLog(#"UIImageFromIplImage called" );
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSData *data = [NSData dataWithBytes:image->imageData length:image->imageSize];
CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
CGImageRef imageRef = CGImageCreate(image->width, image->height, image->depth, image->depth * image->nChannels, image->widthStep, colorSpace, kCGImageAlphaNone|kCGBitmapByteOrderDefault, provider, NULL, false, kCGRenderingIntentDefault);
UIImage *ret = [UIImage imageWithCGImage:imageRef scale:1 orientation:orientation];
CGImageRelease(imageRef);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return ret;
}
Then I am rotating the Image as per my requirement
-(void)crop:(UIImage*)image
{
NSLog(#"crop called" );
//Adjust the image size, to scale the image to 1013 of width
float targetWidth = 1009.0f;
float scale = targetWidth / image.size.width;
float scaleheight = image.size.height * scale;
UIImage *imageToSent = [ImageCropViewController scaleImage:image with:CGSizeMake(targetWidth, scaleheight)];
if([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationLandscapeLeft)
{
NSLog(#"###########Image orientation is UIInterfaceOrientationLandscapeLeft###########");
imageToSent = [[UIImage alloc] initWithCGImage:imageToSent.CGImage scale:1.0f orientation:UIImageOrientationDown];
}
NSData *imageData = UIImageJPEGRepresentation(imageToSent,0.75);
NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0];
NSString *caldate = [now description];
appDelegate.imagefilePath= [NSString stringWithFormat:#"%#/%#.jpg", DOCUMENTS_FOLDER,caldate];
[imageData writeToFile:appDelegate.imagefilePath atomically:YES];
appDelegate.cropimage=imageToSent;
}
I am not getting where it was gone wrong.It is killing my time.Please help me.
Thanks in advance

Answer 1

I have this code for cropping. Why are you using openGL. Here is my code.
- (UIImage *)cropImage : (UIImage*)myImage withRect:(CGRect)rect
{
CGImageRef imageRef = CGImageCreateWithImageInRect([myImage CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return img;
}
Just call this method whenever you want to crop your image. Also When you take an image from Camera or gallery(image taken from native camera app) you will get a rotated image. Use this code to get it back the original image.
//----rotate image if picked from gallery or camera----//
- (UIImage *)scaleAndRotateImage:(UIImage *)image {
NSLog(#"scaleAndRotateImage");
static int kMaxResolution = 640; // this is the maximum resolution that you want to set for an image.
CGImageRef imgRef = image.CGImage;
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGAffineTransform transform = CGAffineTransformIdentity;
CGRect bounds = CGRectMake(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution) {
CGFloat ratio = width/height;
if (ratio > 1) {
bounds.size.width = kMaxResolution;
bounds.size.height = bounds.size.width / ratio;
} else {
bounds.size.height = kMaxResolution;
bounds.size.width = bounds.size.height * ratio;
}
}
CGFloat scaleRatio = bounds.size.width / width;
CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
CGFloat boundHeight;
UIImageOrientation orient = image.imageOrientation;
switch(orient) {
case UIImageOrientationUp:
transform = CGAffineTransformIdentity;
break;
case UIImageOrientationUpMirrored:
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;
case UIImageOrientationDown:
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationDownMirrored:
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;
case UIImageOrientationLeftMirrored:
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationLeft:
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationRightMirrored:
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
case UIImageOrientationRight:
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
default:
[NSException raise:NSInternalInconsistencyException
format:#"Invalid image orientation"];
}
UIGraphicsBeginImageContext(bounds.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
CGContextScaleCTM(context, -scaleRatio, scaleRatio);
CGContextTranslateCTM(context, -height, 0);
} else {
CGContextScaleCTM(context, scaleRatio, -scaleRatio);
CGContextTranslateCTM(context, 0, -height);
}
CGContextConcatCTM(context, transform);
CGContextDrawImage(UIGraphicsGetCurrentContext(),
CGRectMake(0, 0, width, height), imgRef);
UIImage *returnImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return returnImage;
}
Hope I helped.