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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\BitMatrix;
/**
* This class is the core bitmap class used by ZXing to represent 1 bit data. Reader objects
* accept a BinaryBitmap and attempt to decode it.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
final class BinaryBitmap
{
private $binarizer;
private $matrix;
public function __construct(Binarizer $binarizer)
{
if ($binarizer === null) {
throw new \InvalidArgumentException("Binarizer must be non-null.");
}
$this->binarizer = $binarizer;
}
/**
* @return int The width of the bitmap.
*/
public function getWidth()
{
return $this->binarizer->getWidth();
}
/**
* @return int The height of the bitmap.
*/
public function getHeight()
{
return $this->binarizer->getHeight();
}
/**
* Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
* cached data. Callers should assume this method is expensive and call it as seldom as possible.
* This method is intended for decoding 1D barcodes and may choose to apply sharpening.
*
* @param y The row to fetch, which must be in [0, bitmap height)
* @param row An optional preallocated array. If null or too small, it will be ignored.
* If used, the Binarizer will call BitArray.clear(). Always use the returned object.
*
* @return array The array of bits for this row (true means black).
* @throws NotFoundException if row can't be binarized
*/
public function getBlackRow($y, $row)
{
return $this->binarizer->getBlackRow($y, $row);
}
/**
* @return bool Whether this bitmap can be cropped.
*/
public function isCropSupported()
{
return $this->binarizer->getLuminanceSource()->isCropSupported();
}
/**
* Returns a new object with cropped image data. Implementations may keep a reference to the
* original data rather than a copy. Only callable if isCropSupported() is true.
*
* @param left The left coordinate, which must be in [0,getWidth())
* @param top The top coordinate, which must be in [0,getHeight())
* @param width The width of the rectangle to crop.
* @param height The height of the rectangle to crop.
*
* @return BinaryBitmap A cropped version of this object.
*/
public function crop($left, $top, $width, $height)
{
$newSource = $this->binarizer->getLuminanceSource()->crop($left, $top, $width, $height);
return new BinaryBitmap($this->binarizer->createBinarizer($newSource));
}
/**
* @return Whether this bitmap supports counter-clockwise rotation.
*/
public function isRotateSupported()
{
return $this->binarizer->getLuminanceSource()->isRotateSupported();
}
/**
* Returns a new object with rotated image data by 90 degrees counterclockwise.
* Only callable if {@link #isRotateSupported()} is true.
*
* @return BinaryBitmap A rotated version of this object.
*/
public function rotateCounterClockwise()
{
$newSource = $this->binarizer->getLuminanceSource()->rotateCounterClockwise();
return new BinaryBitmap($this->binarizer->createBinarizer($newSource));
}
/**
* Returns a new object with rotated image data by 45 degrees counterclockwise.
* Only callable if {@link #isRotateSupported()} is true.
*
* @return BinaryBitmap A rotated version of this object.
*/
public function rotateCounterClockwise45()
{
$newSource = $this->binarizer->getLuminanceSource()->rotateCounterClockwise45();
return new BinaryBitmap($this->binarizer->createBinarizer($newSource));
}
public function toString()
{
try {
return $this->getBlackMatrix()->toString();
} catch (NotFoundException $e) {
}
return '';
}
/**
* Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
* and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
* may not apply sharpening. Therefore, a row from this matrix may not be identical to one
* fetched using getBlackRow(), so don't mix and match between them.
*
* @return BitMatrix The 2D array of bits for the image (true means black).
* @throws NotFoundException if image can't be binarized to make a matrix
*/
public function getBlackMatrix()
{
// The matrix is created on demand the first time it is requested, then cached. There are two
// reasons for this:
// 1. This work will never be done if the caller only installs 1D Reader objects, or if a
// 1D Reader finds a barcode before the 2D Readers run.
// 2. This work will only be done once even if the caller installs multiple 2D Readers.
if ($this->matrix === null) {
$this->matrix = $this->binarizer->getBlackMatrix();
}
return $this->matrix;
}
}
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