1 /* xscreensaver, Copyright (c) 1992-2014 Jamie Zawinski <jwz@jwz.org>
3 * Permission to use, copy, modify, distribute, and sell this software and its
4 * documentation for any purpose is hereby granted without fee, provided that
5 * the above copyright notice appear in all copies and that both that
6 * copyright notice and this permission notice appear in supporting
7 * documentation. No representations are made about the suitability of this
8 * software for any purpose. It is provided "as is" without express or
12 /* This iOS code to choose and return a random image from the user's
15 * Much of the following written by:
17 * Created by David Oster on 6/23/12.
18 * Copyright (c) 2012 Google. All rights reserved.
19 * Licensed under the Apache License, Version 2.0 (the "License");
20 * you may not use this file except in compliance with the License.
21 * You may obtain a copy of the License at
23 * http://www.apache.org/licenses/LICENSE-2.0
25 * Unless required by applicable law or agreed to in writing, software
26 * distributed under the License is distributed on an "AS IS" BASIS,
27 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
28 * See the License for the specific language governing permissions and
29 * limitations under the License.
32 #ifdef USE_IPHONE // whole file
34 #import <AssetsLibrary/AssetsLibrary.h>
35 #import "grabscreen.h"
38 /* ALAssetsLibrary is an async API, so we need to fire it off and then
39 call a callback when it's done. Fortunately, this fits the same
40 interaction model already used in xscreensaver by load_image_async(),
41 so it works out nicely.
45 void (*callback) (void *uiimage, const char *fn, int width, int height,
49 ALAssetsLibrary *library;
50 NSMutableArray *assets;
56 ios_random_image_done (ios_loader_data *d, BOOL ok)
60 NSUInteger n = ok ? [d->assets count] : 0;
62 ALAsset *asset = [d->assets objectAtIndex: random() % n];
63 ALAssetRepresentation *rep = [asset defaultRepresentation];
65 // "fullScreenImage" returns a smaller image than "fullResolutionImage",
66 // but this function still takes a significant fraction of a second,
67 // causing a visible glitch in e.g. "glslideshow".
68 CGImageRef cgi = [rep fullScreenImage];
70 UIImageOrientation orient = (UIImageOrientation)
71 [[asset valueForProperty:ALAssetPropertyOrientation] intValue];
72 img = [UIImage imageWithCGImage: cgi
76 fn = [[rep filename] cStringUsingEncoding:NSUTF8StringEncoding];
83 d->callback (img, fn, [img size].width, [img size].height, d->closure);
89 ios_load_random_image (void (*callback) (void *uiimage, const char *fn,
90 int width, int height,
94 ios_loader_data *d = (ios_loader_data *) calloc (1, sizeof(*d));
95 d->callback = callback;
98 d->library = [[[ALAssetsLibrary alloc] init] retain];
99 d->assets = [[NSMutableArray array] retain];
101 // The closures passed in here are called later, after we have returned.
103 [d->library enumerateGroupsWithTypes: ALAssetsGroupAll
104 usingBlock: ^(ALAssetsGroup *group, BOOL *stop) {
105 NSString *name = [group valueForProperty:ALAssetsGroupPropertyName];
107 [group enumerateAssetsUsingBlock: ^(ALAsset *asset, NSUInteger index,
109 if ([[asset valueForProperty: ALAssetPropertyType]
110 isEqual: ALAssetTypePhoto]) {
111 [d->assets addObject:asset];
116 if (! group) { // done
117 ios_random_image_done (d, YES);
119 } failureBlock:^(NSError *error) {
120 // E.g., ALAssetsLibraryErrorDomain: "The user has denied the
121 // application access to their media."
122 NSLog(@"reading Photo Library: %@", error);
123 ios_random_image_done (d, NO);
127 #endif // USE_IPHONE - whole file