FLTImagePickerPhotoAssetUtil.m
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "FLTImagePickerPhotoAssetUtil.h"
#import "FLTImagePickerImageUtil.h"
#import "FLTImagePickerMetaDataUtil.h"
#import <MobileCoreServices/MobileCoreServices.h>
@implementation FLTImagePickerPhotoAssetUtil
+ (PHAsset *)getAssetFromImagePickerInfo:(NSDictionary *)info {
return info[UIImagePickerControllerPHAsset];
}
+ (PHAsset *)getAssetFromPHPickerResult:(PHPickerResult *)result API_AVAILABLE(ios(14)) {
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:@[ result.assetIdentifier ]
options:nil];
return fetchResult.firstObject;
}
+ (NSURL *)saveVideoFromURL:(NSURL *)videoURL {
if (![[NSFileManager defaultManager] isReadableFileAtPath:[videoURL path]]) {
return nil;
}
NSString *fileName = [videoURL lastPathComponent];
NSURL *destination = [NSURL fileURLWithPath:[self temporaryFilePath:fileName]];
NSError *error;
[[NSFileManager defaultManager] copyItemAtURL:videoURL toURL:destination error:&error];
if (error) {
return nil;
}
return destination;
}
+ (NSString *)saveImageWithOriginalImageData:(NSData *)originalImageData
image:(UIImage *)image
maxWidth:(NSNumber *)maxWidth
maxHeight:(NSNumber *)maxHeight
imageQuality:(NSNumber *)imageQuality {
NSString *suffix = kFLTImagePickerDefaultSuffix;
FLTImagePickerMIMEType type = kFLTImagePickerMIMETypeDefault;
NSDictionary *metaData = nil;
// Getting the image type from the original image data if necessary.
if (originalImageData) {
type = [FLTImagePickerMetaDataUtil getImageMIMETypeFromImageData:originalImageData];
suffix =
[FLTImagePickerMetaDataUtil imageTypeSuffixFromType:type] ?: kFLTImagePickerDefaultSuffix;
metaData = [FLTImagePickerMetaDataUtil getMetaDataFromImageData:originalImageData];
}
if (type == FLTImagePickerMIMETypeGIF) {
GIFInfo *gifInfo = [FLTImagePickerImageUtil scaledGIFImage:originalImageData
maxWidth:maxWidth
maxHeight:maxHeight];
return [self saveImageWithMetaData:metaData gifInfo:gifInfo suffix:suffix];
} else {
return [self saveImageWithMetaData:metaData
image:image
suffix:suffix
type:type
imageQuality:imageQuality];
}
}
+ (NSString *)saveImageWithPickerInfo:(nullable NSDictionary *)info
image:(UIImage *)image
imageQuality:(NSNumber *)imageQuality {
NSDictionary *metaData = info[UIImagePickerControllerMediaMetadata];
return [self saveImageWithMetaData:metaData
image:image
suffix:kFLTImagePickerDefaultSuffix
type:kFLTImagePickerMIMETypeDefault
imageQuality:imageQuality];
}
+ (NSString *)saveImageWithMetaData:(NSDictionary *)metaData
gifInfo:(GIFInfo *)gifInfo
suffix:(NSString *)suffix {
NSString *path = [self temporaryFilePath:suffix];
return [self saveImageWithMetaData:metaData gifInfo:gifInfo path:path];
}
+ (NSString *)saveImageWithMetaData:(NSDictionary *)metaData
image:(UIImage *)image
suffix:(NSString *)suffix
type:(FLTImagePickerMIMEType)type
imageQuality:(NSNumber *)imageQuality {
NSData *data = [FLTImagePickerMetaDataUtil convertImage:image
usingType:type
quality:imageQuality];
if (metaData) {
NSData *updatedData = [FLTImagePickerMetaDataUtil imageFromImage:data withMetaData:metaData];
// If updating the metadata fails, just save the original.
if (updatedData) {
data = updatedData;
}
}
return [self createFile:data suffix:suffix];
}
+ (NSString *)saveImageWithMetaData:(NSDictionary *)metaData
gifInfo:(GIFInfo *)gifInfo
path:(NSString *)path {
CGImageDestinationRef destination = CGImageDestinationCreateWithURL(
(__bridge CFURLRef)[NSURL fileURLWithPath:path], kUTTypeGIF, gifInfo.images.count, NULL);
NSDictionary *frameProperties = @{
(__bridge NSString *)kCGImagePropertyGIFDictionary : @{
(__bridge NSString *)kCGImagePropertyGIFDelayTime : @(gifInfo.interval),
},
};
NSMutableDictionary *gifMetaProperties = [NSMutableDictionary dictionaryWithDictionary:metaData];
NSMutableDictionary *gifProperties =
(NSMutableDictionary *)gifMetaProperties[(NSString *)kCGImagePropertyGIFDictionary];
if (gifMetaProperties == nil) {
gifProperties = [NSMutableDictionary dictionary];
}
gifProperties[(__bridge NSString *)kCGImagePropertyGIFLoopCount] = @0;
CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)gifMetaProperties);
for (NSInteger index = 0; index < gifInfo.images.count; index++) {
UIImage *image = (UIImage *)[gifInfo.images objectAtIndex:index];
CGImageDestinationAddImage(destination, image.CGImage,
(__bridge CFDictionaryRef)frameProperties);
}
CGImageDestinationFinalize(destination);
CFRelease(destination);
return path;
}
+ (NSString *)temporaryFilePath:(NSString *)suffix {
NSString *fileExtension = [@"image_picker_%@" stringByAppendingString:suffix];
NSString *guid = [[NSProcessInfo processInfo] globallyUniqueString];
NSString *tmpFile = [NSString stringWithFormat:fileExtension, guid];
NSString *tmpDirectory = NSTemporaryDirectory();
NSString *tmpPath = [tmpDirectory stringByAppendingPathComponent:tmpFile];
return tmpPath;
}
+ (NSString *)createFile:(NSData *)data suffix:(NSString *)suffix {
NSString *tmpPath = [self temporaryFilePath:suffix];
if ([[NSFileManager defaultManager] createFileAtPath:tmpPath contents:data attributes:nil]) {
return tmpPath;
} else {
nil;
}
return tmpPath;
}
@end