110 lines
3.9 KiB
Objective-C
110 lines
3.9 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RCTGIFImageDecoder.h"
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#import <ImageIO/ImageIO.h>
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#import <QuartzCore/QuartzCore.h>
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#import <React/RCTUtils.h>
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@implementation RCTGIFImageDecoder
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RCT_EXPORT_MODULE()
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- (BOOL)canDecodeImageData:(NSData *)imageData
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{
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char header[7] = {};
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[imageData getBytes:header length:6];
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return !strcmp(header, "GIF87a") || !strcmp(header, "GIF89a");
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}
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- (RCTImageLoaderCancellationBlock)decodeImageData:(NSData *)imageData
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size:(CGSize)size
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scale:(CGFloat)scale
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resizeMode:(RCTResizeMode)resizeMode
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completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
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{
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CGImageSourceRef imageSource = CGImageSourceCreateWithData((CFDataRef)imageData, NULL);
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NSDictionary<NSString *, id> *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(imageSource, NULL);
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NSUInteger loopCount = [properties[(id)kCGImagePropertyGIFDictionary][(id)kCGImagePropertyGIFLoopCount] unsignedIntegerValue];
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UIImage *image = nil;
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size_t imageCount = CGImageSourceGetCount(imageSource);
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if (imageCount > 1) {
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NSTimeInterval duration = 0;
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NSMutableArray<NSNumber *> *delays = [NSMutableArray arrayWithCapacity:imageCount];
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NSMutableArray<id /* CGIMageRef */> *images = [NSMutableArray arrayWithCapacity:imageCount];
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for (size_t i = 0; i < imageCount; i++) {
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CGImageRef imageRef = CGImageSourceCreateImageAtIndex(imageSource, i, NULL);
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if (!image) {
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image = [UIImage imageWithCGImage:imageRef scale:scale orientation:UIImageOrientationUp];
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}
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NSDictionary<NSString *, id> *frameProperties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(imageSource, i, NULL);
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NSDictionary<NSString *, id> *frameGIFProperties = frameProperties[(id)kCGImagePropertyGIFDictionary];
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const NSTimeInterval kDelayTimeIntervalDefault = 0.1;
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NSNumber *delayTime = frameGIFProperties[(id)kCGImagePropertyGIFUnclampedDelayTime] ?: frameGIFProperties[(id)kCGImagePropertyGIFDelayTime];
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if (delayTime == nil) {
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if (i == 0) {
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delayTime = @(kDelayTimeIntervalDefault);
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} else {
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delayTime = delays[i - 1];
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}
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}
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const NSTimeInterval kDelayTimeIntervalMinimum = 0.02;
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if (delayTime.floatValue < (float)kDelayTimeIntervalMinimum - FLT_EPSILON) {
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delayTime = @(kDelayTimeIntervalDefault);
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}
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duration += delayTime.doubleValue;
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delays[i] = delayTime;
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images[i] = (__bridge_transfer id)imageRef;
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}
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CFRelease(imageSource);
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NSMutableArray<NSNumber *> *keyTimes = [NSMutableArray arrayWithCapacity:delays.count];
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NSTimeInterval runningDuration = 0;
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for (NSNumber *delayNumber in delays) {
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[keyTimes addObject:@(runningDuration / duration)];
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runningDuration += delayNumber.doubleValue;
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}
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[keyTimes addObject:@1.0];
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// Create animation
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CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
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animation.calculationMode = kCAAnimationDiscrete;
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animation.repeatCount = loopCount == 0 ? HUGE_VALF : loopCount;
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animation.keyTimes = keyTimes;
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animation.values = images;
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animation.duration = duration;
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animation.removedOnCompletion = NO;
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image.reactKeyframeAnimation = animation;
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} else {
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// Don't bother creating an animation
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CGImageRef imageRef = CGImageSourceCreateImageAtIndex(imageSource, 0, NULL);
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if (imageRef) {
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image = [UIImage imageWithCGImage:imageRef scale:scale orientation:UIImageOrientationUp];
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CFRelease(imageRef);
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}
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CFRelease(imageSource);
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}
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completionHandler(nil, image);
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return ^{};
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}
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@end
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