From 7b02207537d35bfa1714bf8beafc921f717d100a Mon Sep 17 00:00:00 2001
From: 单军华
Date: Wed, 11 Jul 2018 10:47:42 +0800
Subject: [PATCH] 首次上传
---
screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageGIFCoder.m | 183 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 183 insertions(+), 0 deletions(-)
diff --git a/screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageGIFCoder.m b/screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageGIFCoder.m
new file mode 100644
index 0000000..b9ebf1a
--- /dev/null
+++ b/screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageGIFCoder.m
@@ -0,0 +1,183 @@
+/*
+ * 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 "SDWebImageGIFCoder.h"
+#import "NSImage+WebCache.h"
+#import <ImageIO/ImageIO.h>
+#import "NSData+ImageContentType.h"
+#import "UIImage+MultiFormat.h"
+#import "SDWebImageCoderHelper.h"
+#import "SDAnimatedImageRep.h"
+
+@implementation SDWebImageGIFCoder
+
++ (instancetype)sharedCoder {
+ static SDWebImageGIFCoder *coder;
+ static dispatch_once_t onceToken;
+ dispatch_once(&onceToken, ^{
+ coder = [[SDWebImageGIFCoder alloc] init];
+ });
+ return coder;
+}
+
+#pragma mark - Decode
+- (BOOL)canDecodeFromData:(nullable NSData *)data {
+ return ([NSData sd_imageFormatForImageData:data] == SDImageFormatGIF);
+}
+
+- (UIImage *)decodedImageWithData:(NSData *)data {
+ if (!data) {
+ return nil;
+ }
+
+#if SD_MAC
+ SDAnimatedImageRep *imageRep = [[SDAnimatedImageRep alloc] initWithData:data];
+ NSImage *animatedImage = [[NSImage alloc] initWithSize:imageRep.size];
+ [animatedImage addRepresentation:imageRep];
+ return animatedImage;
+#else
+
+ CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
+ if (!source) {
+ return nil;
+ }
+ size_t count = CGImageSourceGetCount(source);
+
+ UIImage *animatedImage;
+
+ if (count <= 1) {
+ animatedImage = [[UIImage alloc] initWithData:data];
+ } else {
+ NSMutableArray<SDWebImageFrame *> *frames = [NSMutableArray array];
+
+ for (size_t i = 0; i < count; i++) {
+ CGImageRef imageRef = CGImageSourceCreateImageAtIndex(source, i, NULL);
+ if (!imageRef) {
+ continue;
+ }
+
+ float duration = [self sd_frameDurationAtIndex:i source:source];
+ UIImage *image = [[UIImage alloc] initWithCGImage:imageRef];
+ CGImageRelease(imageRef);
+
+ SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:image duration:duration];
+ [frames addObject:frame];
+ }
+
+ NSUInteger loopCount = 1;
+ NSDictionary *imageProperties = (__bridge_transfer NSDictionary *)CGImageSourceCopyProperties(source, nil);
+ NSDictionary *gifProperties = [imageProperties valueForKey:(__bridge_transfer NSString *)kCGImagePropertyGIFDictionary];
+ if (gifProperties) {
+ NSNumber *gifLoopCount = [gifProperties valueForKey:(__bridge_transfer NSString *)kCGImagePropertyGIFLoopCount];
+ if (gifLoopCount != nil) {
+ loopCount = gifLoopCount.unsignedIntegerValue;
+ }
+ }
+
+ animatedImage = [SDWebImageCoderHelper animatedImageWithFrames:frames];
+ animatedImage.sd_imageLoopCount = loopCount;
+ }
+
+ CFRelease(source);
+
+ return animatedImage;
+#endif
+}
+
+- (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
+ float frameDuration = 0.1f;
+ CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
+ if (!cfFrameProperties) {
+ return frameDuration;
+ }
+ NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
+ NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
+
+ NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
+ if (delayTimeUnclampedProp != nil) {
+ frameDuration = [delayTimeUnclampedProp floatValue];
+ } else {
+ NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
+ if (delayTimeProp != nil) {
+ frameDuration = [delayTimeProp floatValue];
+ }
+ }
+
+ // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
+ // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
+ // a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082>
+ // for more information.
+
+ if (frameDuration < 0.011f) {
+ frameDuration = 0.100f;
+ }
+
+ CFRelease(cfFrameProperties);
+ return frameDuration;
+}
+
+- (UIImage *)decompressedImageWithImage:(UIImage *)image
+ data:(NSData *__autoreleasing _Nullable *)data
+ options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
+ // GIF do not decompress
+ return image;
+}
+
+#pragma mark - Encode
+- (BOOL)canEncodeToFormat:(SDImageFormat)format {
+ return (format == SDImageFormatGIF);
+}
+
+- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
+ if (!image) {
+ return nil;
+ }
+
+ if (format != SDImageFormatGIF) {
+ return nil;
+ }
+
+ NSMutableData *imageData = [NSMutableData data];
+ CFStringRef imageUTType = [NSData sd_UTTypeFromSDImageFormat:SDImageFormatGIF];
+ NSArray<SDWebImageFrame *> *frames = [SDWebImageCoderHelper framesFromAnimatedImage:image];
+
+ // Create an image destination. GIF does not support EXIF image orientation
+ CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, frames.count, NULL);
+ if (!imageDestination) {
+ // Handle failure.
+ return nil;
+ }
+ if (frames.count == 0) {
+ // for static single GIF images
+ CGImageDestinationAddImage(imageDestination, image.CGImage, nil);
+ } else {
+ // for animated GIF images
+ NSUInteger loopCount = image.sd_imageLoopCount;
+ NSDictionary *gifProperties = @{(__bridge_transfer NSString *)kCGImagePropertyGIFDictionary: @{(__bridge_transfer NSString *)kCGImagePropertyGIFLoopCount : @(loopCount)}};
+ CGImageDestinationSetProperties(imageDestination, (__bridge CFDictionaryRef)gifProperties);
+
+ for (size_t i = 0; i < frames.count; i++) {
+ SDWebImageFrame *frame = frames[i];
+ float frameDuration = frame.duration;
+ CGImageRef frameImageRef = frame.image.CGImage;
+ NSDictionary *frameProperties = @{(__bridge_transfer NSString *)kCGImagePropertyGIFDictionary : @{(__bridge_transfer NSString *)kCGImagePropertyGIFDelayTime : @(frameDuration)}};
+ CGImageDestinationAddImage(imageDestination, frameImageRef, (__bridge CFDictionaryRef)frameProperties);
+ }
+ }
+ // Finalize the destination.
+ if (CGImageDestinationFinalize(imageDestination) == NO) {
+ // Handle failure.
+ imageData = nil;
+ }
+
+ CFRelease(imageDestination);
+
+ return [imageData copy];
+}
+
+@end
--
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