mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Chaoshuai Lu
d70d7fd0b3
Summary: Apple suggested to this new API on iOS 10+. > // Any new bitmap drawing code is encouraged to use UIGraphicsImageRenderer in lieu of this API. WWDC18 Reference: https://developer.apple.com/videos/play/wwdc2018/219/ > Use UIGraphicsImageRenderer to create and draw to an image buffer Supports Wide Color, unlike UIGraphicsBeginImageContext() Combine with UIImageView for efficient offscreen rendering Per https://nshipster.com/image-resizing/#performance-benchmarks, the new API runs even faster than the C version, probably due to more smart context reuses/management. Changelog: [iOS][Changed] - Adopt UIGraphicsImageRenderer API Reviewed By: philIip Differential Revision: D35699584 fbshipit-source-id: 7a1e2109d5e121fb396c1014f4ed0a892211b0cc
88 lines
2.8 KiB
Objective-C
88 lines
2.8 KiB
Objective-C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "Screenshot.h"
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#import <React/RCTUIManager.h>
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@implementation ScreenshotManager
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RCT_EXPORT_MODULE();
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RCT_EXPORT_METHOD(takeScreenshot
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: (id /* NSString or NSNumber */)target withOptions
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: (NSDictionary *)options resolve
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: (RCTPromiseResolveBlock)resolve reject
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: (RCTPromiseRejectBlock)reject)
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{
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[self.bridge.uiManager addUIBlock:^(
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__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, UIView *> *viewRegistry) {
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// Get view
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UIView *view;
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if (target == nil || [target isEqual:@"window"]) {
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view = RCTKeyWindow();
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} else if ([target isKindOfClass:[NSNumber class]]) {
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view = viewRegistry[target];
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if (!view) {
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RCTLogError(@"No view found with reactTag: %@", target);
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return;
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}
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}
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// Get options
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CGSize size = [RCTConvert CGSize:options];
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NSString *format = [RCTConvert NSString:options[@"format"] ?: @"png"];
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// Capture image
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if (size.width < 0.1 || size.height < 0.1) {
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size = view.bounds.size;
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}
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UIGraphicsImageRendererFormat *const rendererFormat = [UIGraphicsImageRendererFormat defaultFormat];
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UIGraphicsImageRenderer *const renderer = [[UIGraphicsImageRenderer alloc] initWithSize:size format:rendererFormat];
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__block BOOL success = NO;
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UIImage *image = [renderer imageWithActions:^(UIGraphicsImageRendererContext *_Nonnull context) {
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success = [view drawViewHierarchyInRect:(CGRect){CGPointZero, size} afterScreenUpdates:YES];
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}];
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if (!success || !image) {
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reject(RCTErrorUnspecified, @"Failed to capture view snapshot.", nil);
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return;
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}
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// Convert image to data (on a background thread)
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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NSData *data;
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if ([format isEqualToString:@"png"]) {
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data = UIImagePNGRepresentation(image);
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} else if ([format isEqualToString:@"jpeg"]) {
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CGFloat quality = [RCTConvert CGFloat:options[@"quality"] ?: @1];
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data = UIImageJPEGRepresentation(image, quality);
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} else {
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RCTLogError(@"Unsupported image format: %@", format);
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return;
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}
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// Save to a temp file
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NSError *error = nil;
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NSString *tempFilePath = RCTTempFilePath(format, &error);
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if (tempFilePath) {
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if ([data writeToFile:tempFilePath options:(NSDataWritingOptions)0 error:&error]) {
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resolve(tempFilePath);
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return;
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}
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}
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// If we reached here, something went wrong
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reject(RCTErrorUnspecified, error.localizedDescription, error);
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});
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}];
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}
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@end
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