CODEWITHSUNDEEP
ios7uiimagepickercontrolleralassetslibrary
Léo Natan
Léo Natan

Reputation: 57060

ALAssetsLibrary returns image without external crop or other filters

I have a strange issue on iOS7.

The user can open an image in the Photos app and crop it.

In my app, when I attempt to get the image, it comes back without the crop. Other edits, such as rotation, are preserved.

I present the image picker without editing capabilities.

My code:

ALAssetsLibrary *assetLibrary=[[ALAssetsLibrary alloc] init];
[assetLibrary assetForURL:[info valueForKey:UIImagePickerControllerReferenceURL] resultBlock:^(ALAsset *asset) {
    ALAssetRepresentation *rep = [asset defaultRepresentation];
    Byte *buffer = (Byte*)malloc(rep.size);
    NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:nil];
    NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];//this is NSData may be what you want

    editedImage = [UIImage imageWithData:data];

} failureBlock:^(NSError *err) {
    NSLog(@"Error: %@",[err localizedDescription]);
}];

If I use

UIImage *image = info[UIImagePickerControllerOriginalImage];
content = UIImageJPEGRepresentation(image, 1.0);

the image is cropped correctly.

Is this a bug in iOS7?

Upvotes: 0

Views: 289

Answers (1)

Léo Natan
Léo Natan

Reputation: 57060

It turns out, the crop is actually saved in a metadata.

Here is what I ended up doing:

ALAssetRepresentation *rep = [asset defaultRepresentation];

NSString *xmpString = rep.metadata[@"AdjustmentXMP"];

if(xmpString)
{
    NSData *xmpData = [xmpString dataUsingEncoding:NSUTF8StringEncoding];

    CIImage *image = [CIImage imageWithCGImage:rep.fullResolutionImage];

    NSError *error = nil;
    NSArray *filterArray = [CIFilter filterArrayFromSerializedXMP:xmpData
                                                 inputImageExtent:image.extent
                                                            error:&error];

    if (error)
    {
        DM_FLOG(@"ERROR:: Error during CIFilter creation: %@", [error localizedDescription]);
    }

    for (CIFilter *filter in filterArray) {
        [filter setValue:image forKey:kCIInputImageKey];
        image = [filter outputImage];
    }

    CIContext* context = [CIContext contextWithOptions:nil];
    CGImageRef cgImage = [context createCGImage:image fromRect:[image extent]];
    context = nil;
    image = nil;

    contentType = @"image/jpeg";
    content = UIImageJPEGRepresentation([UIImage imageWithCGImage:cgImage], 1.0);

    CGImageRelease(cgImage);
}
else
{
    Byte *buffer = (Byte*)malloc(rep.size);
    NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:nil];
    content = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
}

Upvotes: 1

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