98 lines
3.3 KiB
Objective-C
98 lines
3.3 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTGIFImage.h"
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#import "RCTLog.h"
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static CAKeyframeAnimation *RCTGIFImageWithImageSource(CGImageSourceRef imageSource)
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{
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if (!UTTypeConformsTo(CGImageSourceGetType(imageSource), kUTTypeGIF)) {
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return nil;
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}
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NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(imageSource, NULL);
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NSUInteger loopCount = [properties[(id)kCGImagePropertyGIFDictionary][(id)kCGImagePropertyGIFLoopCount] unsignedIntegerValue];
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size_t imageCount = CGImageSourceGetCount(imageSource);
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NSTimeInterval duration = 0;
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NSMutableArray *delays = [NSMutableArray arrayWithCapacity:imageCount];
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NSMutableArray *images = [NSMutableArray arrayWithCapacity:imageCount];
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for (size_t i = 0; i < imageCount; i++) {
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CGImageRef image = CGImageSourceCreateImageAtIndex(imageSource, i, NULL);
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NSDictionary *frameProperties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(imageSource, i, NULL);
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NSDictionary *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)image;
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}
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NSMutableArray *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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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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return animation;
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}
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CAKeyframeAnimation *RCTGIFImageWithData(NSData *data)
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{
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if (data.length == 0) {
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return nil;
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}
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CGImageSourceRef imageSource = CGImageSourceCreateWithData((CFDataRef)data, NULL);
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CAKeyframeAnimation *animation = RCTGIFImageWithImageSource(imageSource);
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CFRelease(imageSource);
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return animation;
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}
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CAKeyframeAnimation *RCTGIFImageWithFileURL(NSURL *URL)
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{
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if (!URL) {
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return nil;
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}
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if (![URL isFileURL]) {
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RCTLogError(@"Loading remote image URLs synchronously is a really bad idea.");
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return nil;
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}
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CGImageSourceRef imageSource = CGImageSourceCreateWithURL((CFURLRef)URL, NULL);
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CAKeyframeAnimation *animation = RCTGIFImageWithImageSource(imageSource);
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CFRelease(imageSource);
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return animation;
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}
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