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