Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: cac29dc753
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 284 lines (236 sloc) 11.21 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283
/*
* This file is part of the SDWebImage package.
* (c) Olivier Poitrey <rs@dailymotion.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

#import "SDWebImageDownloader.h"
#import "SDWebImageDecoder.h"
#import <ImageIO/ImageIO.h>

@interface SDWebImageDownloader (ImageDecoder) <SDWebImageDecoderDelegate>
@end

NSString *const SDWebImageDownloadStartNotification = @"SDWebImageDownloadStartNotification";
NSString *const SDWebImageDownloadStopNotification = @"SDWebImageDownloadStopNotification";

@interface SDWebImageDownloader ()
@property (nonatomic, retain) NSURLConnection *connection;
@end

@implementation SDWebImageDownloader
@synthesize url, delegate, connection, imageData, userInfo, lowPriority, progressive;

#pragma mark Public Methods

+ (id)downloaderWithURL:(NSURL *)url delegate:(id<SDWebImageDownloaderDelegate>)delegate
{
    return [self downloaderWithURL:url delegate:delegate userInfo:nil];
}

+ (id)downloaderWithURL:(NSURL *)url delegate:(id<SDWebImageDownloaderDelegate>)delegate userInfo:(id)userInfo
{
    return [self downloaderWithURL:url delegate:delegate userInfo:userInfo lowPriority:NO];
}

+ (id)downloaderWithURL:(NSURL *)url delegate:(id<SDWebImageDownloaderDelegate>)delegate userInfo:(id)userInfo lowPriority:(BOOL)lowPriority
{
    // Bind SDNetworkActivityIndicator if available (download it here: http://github.com/rs/SDNetworkActivityIndicator )
    // To use it, just add #import "SDNetworkActivityIndicator.h" in addition to the SDWebImage import
    if (NSClassFromString(@"SDNetworkActivityIndicator"))
    {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        id activityIndicator = [NSClassFromString(@"SDNetworkActivityIndicator") performSelector:NSSelectorFromString(@"sharedActivityIndicator")];
#pragma clang diagnostic pop

        // Remove observer in case it was previously added.
        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStartNotification object:nil];
        [[NSNotificationCenter defaultCenter] removeObserver:activityIndicator name:SDWebImageDownloadStopNotification object:nil];

        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
                                                 selector:NSSelectorFromString(@"startActivity")
                                                     name:SDWebImageDownloadStartNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:activityIndicator
                                                 selector:NSSelectorFromString(@"stopActivity")
                                                     name:SDWebImageDownloadStopNotification object:nil];
    }

    SDWebImageDownloader *downloader = SDWIReturnAutoreleased([[SDWebImageDownloader alloc] init]);
    downloader.url = url;
    downloader.delegate = delegate;
    downloader.userInfo = userInfo;
    downloader.lowPriority = lowPriority;
    [downloader performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:YES];
    return downloader;
}

+ (void)setMaxConcurrentDownloads:(NSUInteger)max
{
    // NOOP
}

- (void)start
{
    // In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15];
    self.connection = SDWIReturnAutoreleased([[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO]);

    // If not in low priority mode, ensure we aren't blocked by UI manipulations (default runloop mode for NSURLConnection is NSEventTrackingRunLoopMode)
    if (!lowPriority)
    {
        [connection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
    }
    [connection start];
    SDWIRelease(request);

    if (connection)
    {
        [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStartNotification object:nil];
    }
    else
    {
        if ([delegate respondsToSelector:@selector(imageDownloader:didFailWithError:)])
        {
            [delegate performSelector:@selector(imageDownloader:didFailWithError:) withObject:self withObject:nil];
        }
    }
}

- (void)cancel
{
    if (connection)
    {
        [connection cancel];
        self.connection = nil;
        [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:nil];
    }
}

#pragma mark NSURLConnection (delegate)

- (void)connection:(NSURLConnection *)aConnection didReceiveResponse:(NSURLResponse *)response
{
    if (![response respondsToSelector:@selector(statusCode)] || [((NSHTTPURLResponse *)response) statusCode] < 400)
    {
        expectedSize = response.expectedContentLength > 0 ? (NSUInteger)response.expectedContentLength : 0;
        self.imageData = SDWIReturnAutoreleased([[NSMutableData alloc] initWithCapacity:expectedSize]);
    }
    else
    {
        [aConnection cancel];

        [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:nil];

        if ([delegate respondsToSelector:@selector(imageDownloader:didFailWithError:)])
        {
            NSError *error = [[NSError alloc] initWithDomain:NSURLErrorDomain
                                                        code:[((NSHTTPURLResponse *)response) statusCode]
                                                    userInfo:nil];
            [delegate performSelector:@selector(imageDownloader:didFailWithError:) withObject:self withObject:error];
            SDWIRelease(error);
        }

        self.connection = nil;
        self.imageData = nil;
    }
}

- (void)connection:(NSURLConnection *)aConnection didReceiveData:(NSData *)data
{
    [imageData appendData:data];

    if (CGImageSourceCreateImageAtIndex == NULL)
    {
        // ImageIO isn't present in iOS < 4
        self.progressive = NO;
    }

    if (self.progressive && expectedSize > 0 && [delegate respondsToSelector:@selector(imageDownloader:didUpdatePartialImage:)])
    {
        // The following code is from http://www.cocoaintheshell.com/2011/05/progressive-images-download-imageio/
        // Thanks to the author @Nyx0uf

        // Get the total bytes downloaded
        const NSUInteger totalSize = [imageData length];

        // Update the data source, we must pass ALL the data, not just the new bytes
        CGImageSourceRef imageSource = CGImageSourceCreateIncremental(NULL);
#if __has_feature(objc_arc)
        CGImageSourceUpdateData(imageSource, (__bridge CFDataRef)imageData, totalSize == expectedSize);
#else
        CGImageSourceUpdateData(imageSource, (CFDataRef)imageData, totalSize == expectedSize);
#endif

        if (width + height == 0)
        {
            CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, NULL);
            if (properties)
            {
                CFTypeRef val = CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight);
                if (val) CFNumberGetValue(val, kCFNumberLongType, &height);
                val = CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth);
                if (val) CFNumberGetValue(val, kCFNumberLongType, &width);
                CFRelease(properties);
            }
        }

        if (width + height > 0 && totalSize < expectedSize)
        {
            // Create the image
            CGImageRef partialImageRef = CGImageSourceCreateImageAtIndex(imageSource, 0, NULL);

#ifdef TARGET_OS_IPHONE
            // Workaround for iOS anamorphic image
            if (partialImageRef)
            {
                const size_t partialHeight = CGImageGetHeight(partialImageRef);
                CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
                CGContextRef bmContext = CGBitmapContextCreate(NULL, width, height, 8, width * 4, colorSpace, kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedFirst);
                CGColorSpaceRelease(colorSpace);
                if (bmContext)
                {
                    CGContextDrawImage(bmContext, (CGRect){.origin.x = 0.0f, .origin.y = 0.0f, .size.width = width, .size.height = partialHeight}, partialImageRef);
                    CGImageRelease(partialImageRef);
                    partialImageRef = CGBitmapContextCreateImage(bmContext);
                    CGContextRelease(bmContext);
                }
                else
                {
                    CGImageRelease(partialImageRef);
                    partialImageRef = nil;
                }
            }
#endif

            if (partialImageRef)
            {
                UIImage *image = SDScaledImageForPath(url.absoluteString, [UIImage imageWithCGImage:partialImageRef]);
                [[SDWebImageDecoder sharedImageDecoder] decodeImage:image
                                                       withDelegate:self
                                                           userInfo:[NSDictionary dictionaryWithObject:@"partial" forKey:@"type"]];

                CGImageRelease(partialImageRef);
            }
        }

        CFRelease(imageSource);
    }
}

#pragma GCC diagnostic ignored "-Wundeclared-selector"
- (void)connectionDidFinishLoading:(NSURLConnection *)aConnection
{
    self.connection = nil;

    [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:nil];

    if ([delegate respondsToSelector:@selector(imageDownloaderDidFinish:)])
    {
        [delegate performSelector:@selector(imageDownloaderDidFinish:) withObject:self];
    }

    if ([delegate respondsToSelector:@selector(imageDownloader:didFinishWithImage:)])
    {
        UIImage *image = SDScaledImageForPath(url.absoluteString, imageData);
        [[SDWebImageDecoder sharedImageDecoder] decodeImage:image withDelegate:self userInfo:nil];
    }
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:nil];

    if ([delegate respondsToSelector:@selector(imageDownloader:didFailWithError:)])
    {
        [delegate performSelector:@selector(imageDownloader:didFailWithError:) withObject:self withObject:error];
    }

    self.connection = nil;
    self.imageData = nil;
}

#pragma mark SDWebImageDecoderDelegate

- (void)imageDecoder:(SDWebImageDecoder *)decoder didFinishDecodingImage:(UIImage *)image userInfo:(NSDictionary *)aUserInfo
{
    if ([[aUserInfo valueForKey:@"type"] isEqualToString:@"partial"])
    {
        [delegate imageDownloader:self didUpdatePartialImage:image];
    }
    else
    {
        [delegate performSelector:@selector(imageDownloader:didFinishWithImage:) withObject:self withObject:image];
    }
}

#pragma mark NSObject

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    SDWISafeRelease(url);
    SDWISafeRelease(connection);
    SDWISafeRelease(imageData);
    SDWISafeRelease(userInfo);
    SDWISuperDealoc;
}


@end
Something went wrong with that request. Please try again.