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 "SDImageGIFCoder.h"
#import "SDImageAPNGCoder.h"
@interface SDImageGIFCoder ()
- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source;
@end
@interface SDImageAPNGCoder ()
- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source;
- (NSUInteger)sd_imageLoopCountWithSource:(CGImageSourceRef)source;
@end
@interface SDAnimatedImageRep ()
@property (nonatomic, assign, readonly, nullable) CGImageSourceRef imageSource;
@end
@implementation SDAnimatedImageRep
// `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 = self.imageSource;
if (!imageSource) {
return self;
}
NSUInteger frameCount = CGImageSourceGetCount(imageSource);
if (frameCount <= 1) {
return self;
}
CFStringRef type = CGImageSourceGetType(imageSource);
if (!type) {
return self;
}
if (CFStringCompare(type, kUTTypeGIF, 0) == kCFCompareEqualTo) {
// GIF
// Do nothing because NSBitmapImageRep support it
} else if (CFStringCompare(type, kUTTypePNG, 0) == kCFCompareEqualTo) {
// APNG
// Do initilize about frame count, current frame/duration and loop count
[self setProperty:NSImageFrameCount withValue:@(frameCount)];
[self setProperty:NSImageCurrentFrame withValue:@(0)];
NSUInteger loopCount = [[SDImageAPNGCoder sharedCoder] sd_imageLoopCountWithSource:imageSource];
[self setProperty:NSImageLoopCount withValue:@(loopCount)];
}
}
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 = self.imageSource;
if (!imageSource) {
return;
}
// Check format type
CFStringRef type = CGImageSourceGetType(imageSource);
if (!type) {
return;
}
NSUInteger index = [value unsignedIntegerValue];
float frameDuration = 0;
if (CFStringCompare(type, kUTTypeGIF, 0) == kCFCompareEqualTo) {
// GIF
frameDuration = [[SDImageGIFCoder sharedCoder] sd_frameDurationAtIndex:index source:imageSource];
} else if (CFStringCompare(type, kUTTypePNG, 0) == kCFCompareEqualTo) {
// APNG
frameDuration = [[SDImageAPNGCoder sharedCoder] sd_frameDurationAtIndex:index source:imageSource];
}
if (!frameDuration) {
return;
}
// Reset super frame duration with the actual frame duration
[super setProperty:NSImageCurrentFrameDuration withValue:@(frameDuration)];
}
}
- (CGImageSourceRef)imageSource {
if (_tiffData) {
return (__bridge CGImageSourceRef)(_tiffData);
}
return NULL;
}
@end
#endif