134 lines
4.4 KiB
Objective-C
134 lines
4.4 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTImageEditingManager.h"
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#import <UIKit/UIKit.h>
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#import "RCTConvert.h"
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#import "RCTLog.h"
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#import "RCTUtils.h"
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#import "RCTImageStoreManager.h"
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#import "RCTImageLoader.h"
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@implementation RCTImageEditingManager
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RCT_EXPORT_MODULE()
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@synthesize bridge = _bridge;
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/**
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* Crops an image and adds the result to the image store.
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*
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* @param imageTag A URL, a string identifying an asset etc.
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* @param cropData Dictionary with `offset`, `size` and `displaySize`.
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* `offset` and `size` are relative to the full-resolution image size.
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* `displaySize` is an optimization - if specified, the image will
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* be scaled down to `displaySize` rather than `size`.
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* All units are in px (not points).
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*/
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RCT_EXPORT_METHOD(cropImage:(NSString *)imageTag
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cropData:(NSDictionary *)cropData
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successCallback:(RCTResponseSenderBlock)successCallback
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errorCallback:(RCTResponseErrorBlock)errorCallback)
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{
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NSDictionary *offset = cropData[@"offset"];
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NSDictionary *size = cropData[@"size"];
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NSDictionary *displaySize = cropData[@"displaySize"];
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NSString *resizeMode = cropData[@"resizeMode"] ?: @"contain";
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if (!offset[@"x"] || !offset[@"y"] || !size[@"width"] || !size[@"height"]) {
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NSString *errorMessage = [NSString stringWithFormat:@"Invalid cropData: %@", cropData];
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RCTLogError(@"%@", errorMessage);
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errorCallback(RCTErrorWithMessage(errorMessage));
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return;
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}
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[_bridge.imageLoader loadImageWithTag:imageTag callback:^(NSError *error, UIImage *image) {
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if (error) {
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errorCallback(error);
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return;
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}
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CGRect rect = (CGRect){
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[RCTConvert CGPoint:offset],
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[RCTConvert CGSize:size]
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};
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// Crop image
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CGRect rectToDrawIn = {{-rect.origin.x, -rect.origin.y}, image.size};
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UIGraphicsBeginImageContextWithOptions(rect.size, !RCTImageHasAlpha(image.CGImage), image.scale);
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[image drawInRect:rectToDrawIn];
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UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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if (displaySize && displaySize[@"width"] && displaySize[@"height"]) {
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CGSize targetSize = [RCTConvert CGSize:displaySize];
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croppedImage = [self scaleImage:croppedImage targetSize:targetSize resizeMode:resizeMode];
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}
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[_bridge.imageStoreManager storeImage:croppedImage withBlock:^(NSString *croppedImageTag) {
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if (!croppedImageTag) {
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NSString *errorMessage = @"Error storing cropped image in RCTImageStoreManager";
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RCTLogWarn(@"%@", errorMessage);
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errorCallback(RCTErrorWithMessage(errorMessage));
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return;
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}
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successCallback(@[croppedImageTag]);
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}];
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}];
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}
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- (UIImage *)scaleImage:(UIImage *)image targetSize:(CGSize)targetSize resizeMode:(NSString *)resizeMode
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{
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if (CGSizeEqualToSize(image.size, targetSize)) {
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return image;
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}
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CGFloat imageRatio = image.size.width / image.size.height;
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CGFloat targetRatio = targetSize.width / targetSize.height;
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CGFloat newWidth = targetSize.width;
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CGFloat newHeight = targetSize.height;
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// contain vs cover
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// http://blog.vjeux.com/2013/image/css-container-and-cover.html
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if ([resizeMode isEqualToString:@"contain"]) {
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if (imageRatio <= targetRatio) {
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newWidth = targetSize.height * imageRatio;
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newHeight = targetSize.height;
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} else {
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newWidth = targetSize.width;
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newHeight = targetSize.width / imageRatio;
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}
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} else if ([resizeMode isEqualToString:@"cover"]) {
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if (imageRatio <= targetRatio) {
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newWidth = targetSize.width;
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newHeight = targetSize.width / imageRatio;
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} else {
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newWidth = targetSize.height * imageRatio;
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newHeight = targetSize.height;
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}
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} // else assume we're stretching the image
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// prevent upscaling
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newWidth = MIN(newWidth, image.size.width);
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newHeight = MIN(newHeight, image.size.height);
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// perform the scaling @1x because targetSize is in actual pixel width/height
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UIGraphicsBeginImageContextWithOptions(targetSize, NO, 1.0f);
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[image drawInRect:CGRectMake(0.f, 0.f, newWidth, newHeight)];
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UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return scaledImage;
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}
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@end
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