| // 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 "FLTImagePickerMetaDataUtil.h" |
| #import <Photos/Photos.h> |
| |
| static const uint8_t kFirstByteJPEG = 0xFF; |
| static const uint8_t kFirstBytePNG = 0x89; |
| static const uint8_t kFirstByteGIF = 0x47; |
| |
| NSString *const kFLTImagePickerDefaultSuffix = @".jpg"; |
| const FLTImagePickerMIMEType kFLTImagePickerMIMETypeDefault = FLTImagePickerMIMETypeJPEG; |
| |
| @implementation FLTImagePickerMetaDataUtil |
| |
| + (FLTImagePickerMIMEType)getImageMIMETypeFromImageData:(NSData *)imageData { |
| uint8_t firstByte; |
| [imageData getBytes:&firstByte length:1]; |
| switch (firstByte) { |
| case kFirstByteJPEG: |
| return FLTImagePickerMIMETypeJPEG; |
| case kFirstBytePNG: |
| return FLTImagePickerMIMETypePNG; |
| case kFirstByteGIF: |
| return FLTImagePickerMIMETypeGIF; |
| } |
| return FLTImagePickerMIMETypeOther; |
| } |
| |
| + (NSString *)imageTypeSuffixFromType:(FLTImagePickerMIMEType)type { |
| switch (type) { |
| case FLTImagePickerMIMETypeJPEG: |
| return @".jpg"; |
| case FLTImagePickerMIMETypePNG: |
| return @".png"; |
| case FLTImagePickerMIMETypeGIF: |
| return @".gif"; |
| default: |
| return nil; |
| } |
| } |
| |
| + (NSDictionary *)getMetaDataFromImageData:(NSData *)imageData { |
| CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)imageData, NULL); |
| NSDictionary *metadata = |
| (NSDictionary *)CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(source, 0, NULL)); |
| CFRelease(source); |
| return metadata; |
| } |
| |
| + (NSData *)imageFromImage:(NSData *)imageData withMetaData:(NSDictionary *)metadata { |
| NSMutableData *targetData = [NSMutableData data]; |
| CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)imageData, NULL); |
| if (source == NULL) { |
| return nil; |
| } |
| CGImageDestinationRef destination = NULL; |
| CFStringRef sourceType = CGImageSourceGetType(source); |
| if (sourceType != NULL) { |
| destination = |
| CGImageDestinationCreateWithData((__bridge CFMutableDataRef)targetData, sourceType, 1, nil); |
| } |
| if (destination == NULL) { |
| CFRelease(source); |
| return nil; |
| } |
| CGImageDestinationAddImageFromSource(destination, source, 0, (__bridge CFDictionaryRef)metadata); |
| CGImageDestinationFinalize(destination); |
| CFRelease(source); |
| CFRelease(destination); |
| return targetData; |
| } |
| |
| + (NSData *)convertImage:(UIImage *)image |
| usingType:(FLTImagePickerMIMEType)type |
| quality:(nullable NSNumber *)quality { |
| if (quality && type != FLTImagePickerMIMETypeJPEG) { |
| NSLog(@"image_picker: compressing is not supported for type %@. Returning the image with " |
| @"original quality", |
| [FLTImagePickerMetaDataUtil imageTypeSuffixFromType:type]); |
| } |
| |
| switch (type) { |
| case FLTImagePickerMIMETypeJPEG: { |
| CGFloat qualityFloat = (quality != nil) ? quality.floatValue : 1; |
| return UIImageJPEGRepresentation(image, qualityFloat); |
| } |
| case FLTImagePickerMIMETypePNG: |
| return UIImagePNGRepresentation(image); |
| default: { |
| // converts to JPEG by default. |
| CGFloat qualityFloat = (quality != nil) ? quality.floatValue : 1; |
| return UIImageJPEGRepresentation(image, qualityFloat); |
| } |
| } |
| } |
| |
| @end |