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/* xscreensaver, Copyright (c) 1992-2017 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
/* iOS 8+ code to choose and return a random image from the photo library.
*/
#ifdef USE_IPHONE // whole file
#import <Photos/Photos.h>
#import "grabscreen.h"
#import "yarandom.h"
void
ios_load_random_image (void (*callback) (void *uiimage, const char *fn,
int width, int height,
void *closure),
void *closure,
int width, int height)
{
// If the user has not yet been asked for authoriziation, pop up the
// auth dialog now and re-invoke this function once it has been
// answered. The callback will run once there has been a Yes or No.
// Otherwise, we'd return right away with colorbars even if the user
// then went on to answer Yes.
//
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusNotDetermined) {
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
ios_load_random_image (callback, closure, width, height);
}];
return;
}
// The rest of this is synchronous.
PHFetchOptions *opt = [PHFetchOptions new];
opt.includeAssetSourceTypes = (PHAssetSourceTypeUserLibrary |
PHAssetSourceTypeCloudShared |
PHAssetSourceTypeiTunesSynced);
PHFetchResult *r = [PHAsset
fetchAssetsWithMediaType: PHAssetMediaTypeImage
options: opt];
NSUInteger n = [r count];
PHAsset *asset = n ? [r objectAtIndex: random() % n] : NULL;
__block UIImage *img = 0;
__block const char *fn = 0;
if (asset) {
PHImageRequestOptions *opt = [[PHImageRequestOptions alloc] init];
opt.synchronous = YES;
// Get the image bits.
//
int size = width > height ? width : height;
[[PHImageManager defaultManager]
requestImageForAsset: asset
targetSize: CGSizeMake (size, size)
contentMode: PHImageContentModeDefault
options: opt
resultHandler:^void (UIImage *image, NSDictionary *info) {
img = image;
}];
// Get the image name.
//
[[PHImageManager defaultManager]
requestImageDataForAsset: asset
options: opt
resultHandler:^(NSData *imageData, NSString *dataUTI,
UIImageOrientation orientation,
NSDictionary *info) {
// Looks like UIImage is pre-rotated to compensate for 'orientation'.
NSString *path = [info objectForKey:@"PHImageFileURLKey"];
if (path)
fn = [[[path lastPathComponent] stringByDeletingPathExtension]
cStringUsingEncoding:NSUTF8StringEncoding];
}];
}
if (img)
callback (img, fn, [img size].width, [img size].height, closure);
else
callback (0, 0, 0, 0, closure);
}
#endif // USE_IPHONE - whole file
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