SDWebImageDecoder.m
4.24 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
/*
* This file is part of the SDWebImage package.
* (c) Olivier Poitrey <rs@dailymotion.com>
*
* Created by james <https://github.com/mystcolor> on 9/28/11.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
#import "SDWebImageDecoder.h"
#define DECOMPRESSED_IMAGE_KEY @"decompressedImage"
#define DECODE_INFO_KEY @"decodeInfo"
#define IMAGE_KEY @"image"
#define DELEGATE_KEY @"delegate"
#define USER_INFO_KEY @"userInfo"
@implementation SDWebImageDecoder
static SDWebImageDecoder *sharedInstance;
- (void)notifyDelegateOnMainThreadWithInfo:(NSDictionary *)dict
{
SDWIRetain(dict);
NSDictionary *decodeInfo = [dict objectForKey:DECODE_INFO_KEY];
UIImage *decodedImage = [dict objectForKey:DECOMPRESSED_IMAGE_KEY];
id <SDWebImageDecoderDelegate> delegate = [decodeInfo objectForKey:DELEGATE_KEY];
NSDictionary *userInfo = [decodeInfo objectForKey:USER_INFO_KEY];
[delegate imageDecoder:self didFinishDecodingImage:decodedImage userInfo:userInfo];
SDWIRelease(dict);
}
- (void)decodeImageWithInfo:(NSDictionary *)decodeInfo
{
UIImage *image = [decodeInfo objectForKey:IMAGE_KEY];
UIImage *decompressedImage = [UIImage decodedImageWithImage:image];
if (!decompressedImage)
{
// If really have any error occurs, we use the original image at this moment
decompressedImage = image;
}
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
decompressedImage, DECOMPRESSED_IMAGE_KEY,
decodeInfo, DECODE_INFO_KEY, nil];
[self performSelectorOnMainThread:@selector(notifyDelegateOnMainThreadWithInfo:) withObject:dict waitUntilDone:NO];
}
- (id)init
{
if ((self = [super init]))
{
// Initialization code here.
imageDecodingQueue = [[NSOperationQueue alloc] init];
}
return self;
}
- (void)decodeImage:(UIImage *)image withDelegate:(id<SDWebImageDecoderDelegate>)delegate userInfo:(NSDictionary *)info
{
NSDictionary *decodeInfo = [NSDictionary dictionaryWithObjectsAndKeys:
image, IMAGE_KEY,
delegate, DELEGATE_KEY,
info, USER_INFO_KEY, nil];
NSOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(decodeImageWithInfo:) object:decodeInfo];
[imageDecodingQueue addOperation:operation];
SDWIRelease(operation);
}
- (void)dealloc
{
SDWIRelease(imageDecodingQueue);
#if ! __has_feature(objc_arc)
[super dealloc];
#endif
}
+ (SDWebImageDecoder *)sharedImageDecoder
{
if (!sharedInstance)
{
sharedInstance = [[SDWebImageDecoder alloc] init];
}
return sharedInstance;
}
@end
@implementation UIImage (ForceDecode)
+ (UIImage *)decodedImageWithImage:(UIImage *)image
{
CGImageRef imageRef = image.CGImage;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL,
CGImageGetWidth(imageRef),
CGImageGetHeight(imageRef),
8,
// Just always return width * 4 will be enough
CGImageGetWidth(imageRef) * 4,
// System only supports RGB, set explicitly
colorSpace,
// Makes system don't need to do extra conversion when displayed.
kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little);
CGColorSpaceRelease(colorSpace);
if (!context) return nil;
CGRect rect = (CGRect){CGPointZero, CGImageGetWidth(imageRef), CGImageGetHeight(imageRef)};
CGContextDrawImage(context, rect, imageRef);
CGImageRef decompressedImageRef = CGBitmapContextCreateImage(context);
CGContextRelease(context);
UIImage *decompressedImage = [[UIImage alloc] initWithCGImage:decompressedImageRef];
CGImageRelease(decompressedImageRef);
return SDWIReturnAutoreleased(decompressedImage);
}
@end