react-native/Libraries/Image/RCTImageEditingManager.m

83 lines
2.7 KiB
Objective-C

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTImageEditingManager.h"
#import <UIKit/UIKit.h>
#import "RCTConvert.h"
#import "RCTLog.h"
#import "RCTUtils.h"
#import "RCTImageUtils.h"
#import "RCTImageStoreManager.h"
#import "RCTImageLoader.h"
@implementation RCTImageEditingManager
RCT_EXPORT_MODULE()
@synthesize bridge = _bridge;
/**
* Crops an image and adds the result to the image store.
*
* @param imageTag A URL, a string identifying an asset etc.
* @param cropData Dictionary with `offset`, `size` and `displaySize`.
* `offset` and `size` are relative to the full-resolution image size.
* `displaySize` is an optimization - if specified, the image will
* be scaled down to `displaySize` rather than `size`.
* All units are in px (not points).
*/
RCT_EXPORT_METHOD(cropImage:(NSString *)imageTag
cropData:(NSDictionary *)cropData
successCallback:(RCTResponseSenderBlock)successCallback
errorCallback:(RCTResponseErrorBlock)errorCallback)
{
CGRect rect = {
[RCTConvert CGPoint:cropData[@"offset"]],
[RCTConvert CGSize:cropData[@"size"]]
};
[_bridge.imageLoader loadImageWithTag:imageTag callback:^(NSError *error, UIImage *image) {
if (error) {
errorCallback(error);
return;
}
// Crop image
CGSize targetSize = rect.size;
CGRect targetRect = {{-rect.origin.x, -rect.origin.y}, image.size};
CGAffineTransform transform = RCTTransformFromTargetRect(image.size, targetRect);
UIImage *croppedImage = RCTTransformImage(image, targetSize, image.scale, transform);
// Scale image
if (cropData[@"displaySize"]) {
targetSize = [RCTConvert CGSize:cropData[@"displaySize"]]; // in pixels
RCTResizeMode resizeMode = [RCTConvert RCTResizeMode:cropData[@"resizeMode"] ?: @"contain"];
targetRect = RCTTargetRect(croppedImage.size, targetSize, 1, resizeMode);
transform = RCTTransformFromTargetRect(croppedImage.size, targetRect);
croppedImage = RCTTransformImage(croppedImage, targetSize, image.scale, transform);
}
// Store image
[_bridge.imageStoreManager storeImage:croppedImage withBlock:^(NSString *croppedImageTag) {
if (!croppedImageTag) {
NSString *errorMessage = @"Error storing cropped image in RCTImageStoreManager";
RCTLogWarn(@"%@", errorMessage);
errorCallback(RCTErrorWithMessage(errorMessage));
return;
}
successCallback(@[croppedImageTag]);
}];
}];
}
@end