/*
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* Copyright 2012 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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@protocol ZXResultPointCallback;
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@class ZXBitMatrix, ZXQRCodeAlignmentPattern;
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/**
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* This class attempts to find alignment patterns in a QR Code. Alignment patterns look like finder
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* patterns but are smaller and appear at regular intervals throughout the image.
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*
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* At the moment this only looks for the bottom-right alignment pattern.
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*
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* This is mostly a simplified copy of {@link FinderPatternFinder}. It is copied,
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* pasted and stripped down here for maximum performance but does unfortunately duplicate
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* some code.
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*
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* This class is thread-safe but not reentrant. Each thread must allocate its own object.
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*/
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@interface ZXQRCodeAlignmentPatternFinder : NSObject
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/**
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* Creates a finder that will look in a portion of the whole image.
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*
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* @param image image to search
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* @param startX left column from which to start searching
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* @param startY top row from which to start searching
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* @param width width of region to search
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* @param height height of region to search
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* @param moduleSize estimated module size so far
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*/
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- (id)initWithImage:(ZXBitMatrix *)image startX:(int)startX startY:(int)startY width:(int)width height:(int)height moduleSize:(float)moduleSize resultPointCallback:(id<ZXResultPointCallback>)resultPointCallback;
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/**
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* This method attempts to find the bottom-right alignment pattern in the image. It is a bit messy since
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* it's pretty performance-critical and so is written to be fast foremost.
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*
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* @return ZXAlignmentPattern if found or nil if not found
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*/
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- (ZXQRCodeAlignmentPattern *)findWithError:(NSError **)error;
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@end
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