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<?php /* * Copyright 2009 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ namespace Zxing; use Zxing\Common\BitArray; use Zxing\Common\BitMatrix; /** * This class hierarchy provides a set of methods to convert luminance data to 1 bit data. * It allows the algorithm to vary polymorphically, for example allowing a very expensive * thresholding technique for servers and a fast one for mobile. It also permits the implementation * to vary, e.g. a JNI version for Android and a Java fallback version for other platforms. * * @author dswitkin@google.com (Daniel Switkin) */ abstract class Binarizer { private $source; protected function __construct($source) { $this->source = $source; } public final function getLuminanceSource() { return $this->source; } /** * Converts one row of luminance data to 1 bit data. May actually do the conversion, or return * cached data. Callers should assume this method is expensive and call it as seldom as possible. * This method is intended for decoding 1D barcodes and may choose to apply sharpening. * For callers which only examine one row of pixels at a time, the same BitArray should be reused * and passed in with each call for performance. However it is legal to keep more than one row * at a time if needed. * * @param y The row to fetch, which must be in [0, bitmap height) * @param row An optional preallocated array. If null or too small, it will be ignored. * If used, the Binarizer will call BitArray.clear(). Always use the returned object. * @return The array of bits for this row (true means black). * @throws NotFoundException if row can't be binarized */ public abstract function getBlackRow($y, $row); /** * Converts a 2D array of luminance data to 1 bit data. As above, assume this method is expensive * and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or * may not apply sharpening. Therefore, a row from this matrix may not be identical to one * fetched using getBlackRow(), so don't mix and match between them. * * @return The 2D array of bits for the image (true means black). * @throws NotFoundException if image can't be binarized to make a matrix */ public abstract function getBlackMatrix(); /** * Creates a new object with the same type as this Binarizer implementation, but with pristine * state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache * of 1 bit data. See Effective Java for why we can't use Java's clone() method. * * @param source The LuminanceSource this Binarizer will operate on. * @return A new concrete Binarizer implementation object. */ public abstract function createBinarizer($source); public final function getWidth() { return $this->source->getWidth(); } public final function getHeight() { return $this->source->getHeight(); } }
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