100 lines
3.5 KiB
Objective-C
100 lines
3.5 KiB
Objective-C
/*
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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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@class ZXBinarizer, ZXBitArray, ZXBitMatrix;
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/**
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* This class is the core bitmap class used by ZXing to represent 1 bit data. Reader objects
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* accept a BinaryBitmap and attempt to decode it.
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*/
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@interface ZXBinaryBitmap : NSObject
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/**
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* @return The width of the bitmap.
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*/
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@property (nonatomic, readonly) int width;
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/**
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* @return The height of the bitmap.
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*/
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@property (nonatomic, readonly) int height;
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/**
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* @return Whether this bitmap can be cropped.
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*/
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@property (nonatomic, readonly) BOOL cropSupported;
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/**
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* @return Whether this bitmap supports counter-clockwise rotation.
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*/
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@property (nonatomic, readonly) BOOL rotateSupported;
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- (id)initWithBinarizer:(ZXBinarizer *)binarizer;
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+ (id)binaryBitmapWithBinarizer:(ZXBinarizer *)binarizer;
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/**
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* Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
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* cached data. Callers should assume this method is expensive and call it as seldom as possible.
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* This method is intended for decoding 1D barcodes and may choose to apply sharpening.
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*
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* @param y The row to fetch, 0 <= y < bitmap height.
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* @param row An optional preallocated array. If null or too small, it will be ignored.
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* If used, the Binarizer will call BitArray.clear(). Always use the returned object.
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* @return The array of bits for this row (true means black).
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*/
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- (ZXBitArray *)blackRow:(int)y row:(ZXBitArray *)row error:(NSError **)error;
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/**
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* Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
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* and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
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* may not apply sharpening. Therefore, a row from this matrix may not be identical to one
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* fetched using getBlackRow(), so don't mix and match between them.
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*
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* @return The 2D array of bits for the image (true means black).
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*/
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- (ZXBitMatrix *)blackMatrixWithError:(NSError **)error;
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/**
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* Returns a new object with cropped image data. Implementations may keep a reference to the
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* original data rather than a copy. Only callable if isCropSupported() is true.
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*
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* @param left The left coordinate, 0 <= left < getWidth().
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* @param top The top coordinate, 0 <= top <= getHeight().
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* @param width The width of the rectangle to crop.
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* @param height The height of the rectangle to crop.
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* @return A cropped version of this object.
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*/
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- (ZXBinaryBitmap *)crop:(int)left top:(int)top width:(int)width height:(int)height;
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/**
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* Returns a new object with rotated image data by 90 degrees counterclockwise.
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* Only callable if {@link #isRotateSupported()} is true.
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*
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* @return A rotated version of this object.
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*/
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- (ZXBinaryBitmap *)rotateCounterClockwise;
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/**
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* Returns a new object with rotated image data by 45 degrees counterclockwise.
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* Only callable if {@link #isRotateSupported()} is true.
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*
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* @return A rotated version of this object.
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*/
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- (ZXBinaryBitmap *)rotateCounterClockwise45;
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@end
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