SDAnimatedImageRep.m
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/*
* 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 "SDAnimatedImageRep.h"
#if SD_MAC
#import "SDWebImageGIFCoder.h"
@interface SDWebImageGIFCoder ()
- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source;
@end
@implementation SDAnimatedImageRep {
CGImageSourceRef _imageSource;
}
- (void)dealloc {
if (_imageSource) {
CFRelease(_imageSource);
_imageSource = NULL;
}
}
// `NSBitmapImageRep`'s `imageRepWithData:` is not designed initlizer
+ (instancetype)imageRepWithData:(NSData *)data {
SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:data];
return imageRep;
}
// We should override init method for `NSBitmapImageRep` to do initlize about animated image format
- (instancetype)initWithData:(NSData *)data {
self = [super initWithData:data];
if (self) {
CGImageSourceRef imageSource = CGImageSourceCreateWithData((__bridge CFDataRef) data, NULL);
if (!imageSource) {
return self;
}
_imageSource = imageSource;
}
return self;
}
// `NSBitmapImageRep` will use `kCGImagePropertyGIFDelayTime` whenever you call `setProperty:withValue:` with `NSImageCurrentFrame` to change the current frame. We override it and use the actual `kCGImagePropertyGIFUnclampedDelayTime` if need.
- (void)setProperty:(NSBitmapImageRepPropertyKey)property withValue:(id)value {
[super setProperty:property withValue:value];
if ([property isEqualToString:NSImageCurrentFrame]) {
// Access the image source
CGImageSourceRef imageSource = _imageSource;
if (!imageSource) {
return;
}
// Check format type
CFStringRef type = CGImageSourceGetType(imageSource);
if (!type) {
return;
}
NSUInteger index = [value unsignedIntegerValue];
float frameDuration = 0;
// Through we currently process GIF only, in the 5.x we support APNG so we keep the extensibility
if (CFStringCompare(type, kUTTypeGIF, 0) == kCFCompareEqualTo) {
frameDuration = [[SDWebImageGIFCoder sharedCoder] sd_frameDurationAtIndex:index source:imageSource];
}
if (!frameDuration) {
return;
}
// Reset super frame duration with the actual frame duration
[super setProperty:NSImageCurrentFrameDuration withValue:@(frameDuration)];
}
}
@end
#endif