GT2/Ejectable/node_modules/react-native/Libraries/Image/RCTImageDataDecoder.h

54 lines
1.9 KiB
Objective-C

/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#import <UIKit/UIKit.h>
#import <React/RCTBridge.h>
#import <React/RCTResizeMode.h>
#import <React/RCTURLRequestHandler.h>
#import <React/RCTImageURLLoader.h>
/**
* Provides the interface needed to register an image decoder. Image decoders
* are also bridge modules, so should be registered using RCT_EXPORT_MODULE().
*/
@protocol RCTImageDataDecoder <RCTBridgeModule>
/**
* Indicates whether this handler is capable of decoding the specified data.
* Typically the handler would examine some sort of header data to determine
* this.
*/
- (BOOL)canDecodeImageData:(NSData *)imageData;
/**
* Decode an image from the data object. The method should call the
* completionHandler when the decoding operation has finished. The method
* should also return a cancellation block, if applicable.
*
* If you provide a custom image decoder, you most implement scheduling yourself,
* to avoid decoding large amounts of images at the same time.
*/
- (RCTImageLoaderCancellationBlock)decodeImageData:(NSData *)imageData
size:(CGSize)size
scale:(CGFloat)scale
resizeMode:(RCTResizeMode)resizeMode
completionHandler:(RCTImageLoaderCompletionBlock)completionHandler;
@optional
/**
* If more than one RCTImageDataDecoder responds YES to `-canDecodeImageData:`
* then `decoderPriority` is used to determine which one to use. The decoder
* with the highest priority will be selected. Default priority is zero.
* If two or more valid decoders have the same priority, the selection order is
* undefined.
*/
- (float)decoderPriority;
@end