112 lines
3.8 KiB
Objective-C
112 lines
3.8 KiB
Objective-C
/**
|
|
* Copyright (c) 2015-present, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD-style license found in the
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
|
*/
|
|
|
|
#import "RCTGIFImageDecoder.h"
|
|
|
|
#import <ImageIO/ImageIO.h>
|
|
#import <MobileCoreServices/MobileCoreServices.h>
|
|
#import <QuartzCore/QuartzCore.h>
|
|
|
|
#import "RCTUtils.h"
|
|
|
|
@implementation RCTGIFImageDecoder
|
|
|
|
RCT_EXPORT_MODULE()
|
|
|
|
- (BOOL)canDecodeImageData:(NSData *)imageData
|
|
{
|
|
char header[7] = {};
|
|
[imageData getBytes:header length:6];
|
|
|
|
return !strcmp(header, "GIF87a") || !strcmp(header, "GIF89a");
|
|
}
|
|
|
|
- (RCTImageLoaderCancellationBlock)decodeImageData:(NSData *)imageData
|
|
size:(CGSize)size
|
|
scale:(CGFloat)scale
|
|
resizeMode:(UIViewContentMode)resizeMode
|
|
completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
|
|
{
|
|
CGImageSourceRef imageSource = CGImageSourceCreateWithData((CFDataRef)imageData, NULL);
|
|
NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(imageSource, NULL);
|
|
NSUInteger loopCount = [properties[(id)kCGImagePropertyGIFDictionary][(id)kCGImagePropertyGIFLoopCount] unsignedIntegerValue];
|
|
|
|
UIImage *image = nil;
|
|
size_t imageCount = CGImageSourceGetCount(imageSource);
|
|
if (imageCount > 1) {
|
|
|
|
NSTimeInterval duration = 0;
|
|
NSMutableArray *delays = [NSMutableArray arrayWithCapacity:imageCount];
|
|
NSMutableArray *images = [NSMutableArray arrayWithCapacity:imageCount];
|
|
for (size_t i = 0; i < imageCount; i++) {
|
|
|
|
CGImageRef imageRef = CGImageSourceCreateImageAtIndex(imageSource, i, NULL);
|
|
if (!image) {
|
|
image = [UIImage imageWithCGImage:imageRef];
|
|
}
|
|
|
|
NSDictionary *frameProperties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(imageSource, i, NULL);
|
|
NSDictionary *frameGIFProperties = frameProperties[(id)kCGImagePropertyGIFDictionary];
|
|
|
|
const NSTimeInterval kDelayTimeIntervalDefault = 0.1;
|
|
NSNumber *delayTime = frameGIFProperties[(id)kCGImagePropertyGIFUnclampedDelayTime] ?: frameGIFProperties[(id)kCGImagePropertyGIFDelayTime];
|
|
if (delayTime == nil) {
|
|
if (i == 0) {
|
|
delayTime = @(kDelayTimeIntervalDefault);
|
|
} else {
|
|
delayTime = delays[i - 1];
|
|
}
|
|
}
|
|
|
|
const NSTimeInterval kDelayTimeIntervalMinimum = 0.02;
|
|
if (delayTime.floatValue < (float)kDelayTimeIntervalMinimum - FLT_EPSILON) {
|
|
delayTime = @(kDelayTimeIntervalDefault);
|
|
}
|
|
|
|
duration += delayTime.doubleValue;
|
|
delays[i] = delayTime;
|
|
images[i] = (__bridge_transfer id)imageRef;
|
|
}
|
|
CFRelease(imageSource);
|
|
|
|
NSMutableArray *keyTimes = [NSMutableArray arrayWithCapacity:delays.count];
|
|
NSTimeInterval runningDuration = 0;
|
|
for (NSNumber *delayNumber in delays) {
|
|
[keyTimes addObject:@(runningDuration / duration)];
|
|
runningDuration += delayNumber.doubleValue;
|
|
}
|
|
|
|
[keyTimes addObject:@1.0];
|
|
|
|
// Create animation
|
|
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
|
|
animation.calculationMode = kCAAnimationDiscrete;
|
|
animation.repeatCount = loopCount == 0 ? HUGE_VALF : loopCount;
|
|
animation.keyTimes = keyTimes;
|
|
animation.values = images;
|
|
animation.duration = duration;
|
|
image.reactKeyframeAnimation = animation;
|
|
|
|
} else {
|
|
|
|
// Don't bother creating an animation
|
|
CGImageRef imageRef = CGImageSourceCreateImageAtIndex(imageSource, 0, NULL);
|
|
if (imageRef) {
|
|
image = [UIImage imageWithCGImage:imageRef];
|
|
CFRelease(imageRef);
|
|
}
|
|
CFRelease(imageSource);
|
|
}
|
|
|
|
completionHandler(nil, image);
|
|
return ^{};
|
|
}
|
|
|
|
@end
|