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https://github.com/zhigang1992/shadowsocks-iOS.git
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109 lines
3.5 KiB
Objective-C
109 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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#import "ZXBinarizer.h"
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#import "ZXBinaryBitmap.h"
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#import "ZXBitArray.h"
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#import "ZXBitMatrix.h"
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@interface ZXBinaryBitmap ()
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@property (nonatomic, strong) ZXBinarizer *binarizer;
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@property (nonatomic, strong) ZXBitMatrix *matrix;
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@end
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@implementation ZXBinaryBitmap
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- (id)initWithBinarizer:(ZXBinarizer *)binarizer {
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if (self = [super init]) {
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if (binarizer == nil) {
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[NSException raise:NSInvalidArgumentException format:@"Binarizer must be non-null."];
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}
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self.binarizer = binarizer;
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}
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return self;
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}
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+ (id)binaryBitmapWithBinarizer:(ZXBinarizer *)binarizer {
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return [[self alloc] initWithBinarizer:binarizer];
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}
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- (int)width {
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return self.binarizer.width;
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}
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- (int)height {
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return self.binarizer.height;
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}
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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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- (ZXBitArray *)blackRow:(int)y row:(ZXBitArray *)row error:(NSError **)error {
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return [self.binarizer blackRow:y row:row error:error];
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}
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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 blackRow(), so don't mix and match between them.
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*/
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- (ZXBitMatrix *)blackMatrixWithError:(NSError **)error {
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if (self.matrix == nil) {
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self.matrix = [self.binarizer blackMatrixWithError:error];
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}
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return self.matrix;
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}
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- (BOOL)cropSupported {
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return [[self.binarizer luminanceSource] cropSupported];
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}
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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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- (ZXBinaryBitmap *)crop:(int)left top:(int)top width:(int)aWidth height:(int)aHeight {
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ZXLuminanceSource *newSource = [[self.binarizer luminanceSource] crop:left top:top width:aWidth height:aHeight];
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return [[ZXBinaryBitmap alloc] initWithBinarizer:[self.binarizer createBinarizer:newSource]];
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}
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- (BOOL)rotateSupported {
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return [[self.binarizer luminanceSource] rotateSupported];
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}
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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 isRotateSupported() is true.
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*/
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- (ZXBinaryBitmap *)rotateCounterClockwise {
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ZXLuminanceSource *newSource = [[self.binarizer luminanceSource] rotateCounterClockwise];
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return [[ZXBinaryBitmap alloc] initWithBinarizer:[self.binarizer createBinarizer:newSource]];
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}
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- (ZXBinaryBitmap *)rotateCounterClockwise45 {
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ZXLuminanceSource *newSource = [[self.binarizer luminanceSource] rotateCounterClockwise45];
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return [[ZXBinaryBitmap alloc] initWithBinarizer:[self.binarizer createBinarizer:newSource]];
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}
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@end
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