//
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// UIImage+GIF.m
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// LBGIFImage
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//
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// Created by Laurin Brandner on 06.01.12.
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// Copyright (c) 2012 __MyCompanyName__. All rights reserved.
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//
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#import "UIImage+GIF.h"
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#import <ImageIO/ImageIO.h>
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@implementation UIImage (GIF)
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+ (UIImage *)sd_animatedGIFWithData:(NSData *)data {
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if (!data) {
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return nil;
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}
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CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
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size_t count = CGImageSourceGetCount(source);
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UIImage *animatedImage;
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if (count <= 1) {
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animatedImage = [[UIImage alloc] initWithData:data];
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}
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else {
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NSMutableArray *images = [NSMutableArray array];
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NSTimeInterval duration = 0.0f;
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for (size_t i = 0; i < count; i++) {
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CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
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if (!image) {
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continue;
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}
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duration += [self sd_frameDurationAtIndex:i source:source];
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[images addObject:[UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]];
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CGImageRelease(image);
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}
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if (!duration) {
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duration = (1.0f / 10.0f) * count;
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}
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animatedImage = [UIImage animatedImageWithImages:images duration:duration];
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}
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CFRelease(source);
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return animatedImage;
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}
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+ (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
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float frameDuration = 0.1f;
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CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
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NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
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NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
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NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
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if (delayTimeUnclampedProp) {
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frameDuration = [delayTimeUnclampedProp floatValue];
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}
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else {
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NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
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if (delayTimeProp) {
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frameDuration = [delayTimeProp floatValue];
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}
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}
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// Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
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// We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
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// a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082>
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// for more information.
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if (frameDuration < 0.011f) {
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frameDuration = 0.100f;
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}
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CFRelease(cfFrameProperties);
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return frameDuration;
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}
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+ (UIImage *)sd_animatedGIFNamed:(NSString *)name {
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CGFloat scale = [UIScreen mainScreen].scale;
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if (scale > 1.0f) {
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NSString *retinaPath = [[NSBundle mainBundle] pathForResource:[name stringByAppendingString:@"@2x"] ofType:@"gif"];
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NSData *data = [NSData dataWithContentsOfFile:retinaPath];
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if (data) {
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return [UIImage sd_animatedGIFWithData:data];
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}
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NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
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data = [NSData dataWithContentsOfFile:path];
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if (data) {
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return [UIImage sd_animatedGIFWithData:data];
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}
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return [UIImage imageNamed:name];
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}
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else {
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NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
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NSData *data = [NSData dataWithContentsOfFile:path];
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if (data) {
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return [UIImage sd_animatedGIFWithData:data];
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}
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return [UIImage imageNamed:name];
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}
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}
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- (UIImage *)sd_animatedImageByScalingAndCroppingToSize:(CGSize)size {
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if (CGSizeEqualToSize(self.size, size) || CGSizeEqualToSize(size, CGSizeZero)) {
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return self;
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}
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CGSize scaledSize = size;
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CGPoint thumbnailPoint = CGPointZero;
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CGFloat widthFactor = size.width / self.size.width;
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CGFloat heightFactor = size.height / self.size.height;
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CGFloat scaleFactor = (widthFactor > heightFactor) ? widthFactor : heightFactor;
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scaledSize.width = self.size.width * scaleFactor;
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scaledSize.height = self.size.height * scaleFactor;
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if (widthFactor > heightFactor) {
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thumbnailPoint.y = (size.height - scaledSize.height) * 0.5;
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}
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else if (widthFactor < heightFactor) {
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thumbnailPoint.x = (size.width - scaledSize.width) * 0.5;
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}
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NSMutableArray *scaledImages = [NSMutableArray array];
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for (UIImage *image in self.images) {
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UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
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[image drawInRect:CGRectMake(thumbnailPoint.x, thumbnailPoint.y, scaledSize.width, scaledSize.height)];
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UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
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[scaledImages addObject:newImage];
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UIGraphicsEndImageContext();
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}
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return [UIImage animatedImageWithImages:scaledImages duration:self.duration];
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}
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@end
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