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<?php /* * Copyright 2007 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\Qrcode; use Zxing\BinaryBitmap; use Zxing\ChecksumException; use Zxing\FormatException; use Zxing\NotFoundException; use Zxing\Reader; use Zxing\Result; use Zxing\Common\BitMatrix; use Zxing\Qrcode\Decoder\Decoder; use Zxing\Qrcode\Detector\Detector; /** * This implementation can detect and decode QR Codes in an image. * * @author Sean Owen */ class QRCodeReader implements Reader { private static $NO_POINTS = []; private $decoder; public function __construct() { $this->decoder = new Decoder(); } /** * @param BinaryBitmap $image * @param null $hints * * @return Result * @throws \Zxing\FormatException * @throws \Zxing\NotFoundException */ public function decode(BinaryBitmap $image, $hints = null) { $decoderResult = null; if ($hints !== null && $hints['PURE_BARCODE']) { $bits = self::extractPureBits($image->getBlackMatrix()); $decoderResult = $this->decoder->decode($bits, $hints); $points = self::$NO_POINTS; } else { $detector = new Detector($image->getBlackMatrix()); $detectorResult = $detector->detect($hints); $decoderResult = $this->decoder->decode($detectorResult->getBits(), $hints); $points = $detectorResult->getPoints(); } $result = new Result($decoderResult->getText(), $decoderResult->getRawBytes(), $points, 'QR_CODE');//BarcodeFormat.QR_CODE $byteSegments = $decoderResult->getByteSegments(); if ($byteSegments !== null) { $result->putMetadata('BYTE_SEGMENTS', $byteSegments);//ResultMetadataType.BYTE_SEGMENTS } $ecLevel = $decoderResult->getECLevel(); if ($ecLevel !== null) { $result->putMetadata('ERROR_CORRECTION_LEVEL', $ecLevel);//ResultMetadataType.ERROR_CORRECTION_LEVEL } if ($decoderResult->hasStructuredAppend()) { $result->putMetadata( 'STRUCTURED_APPEND_SEQUENCE',//ResultMetadataType.STRUCTURED_APPEND_SEQUENCE $decoderResult->getStructuredAppendSequenceNumber() ); $result->putMetadata( 'STRUCTURED_APPEND_PARITY',//ResultMetadataType.STRUCTURED_APPEND_PARITY $decoderResult->getStructuredAppendParity() ); } return $result; } /** * Locates and decodes a QR code in an image. * * @return a String representing the content encoded by the QR code * @throws NotFoundException if a QR code cannot be found * @throws FormatException if a QR code cannot be decoded * @throws ChecksumException if error correction fails */ /** * This method detects a code in a "pure" image -- that is, pure monochrome image * which contains only an unrotated, unskewed, image of a code, with some white border * around it. This is a specialized method that works exceptionally fast in this special * case. * * @see com.google.zxing.datamatrix.DataMatrixReader#extractPureBits(BitMatrix) */ private static function extractPureBits(BitMatrix $image) { $leftTopBlack = $image->getTopLeftOnBit(); $rightBottomBlack = $image->getBottomRightOnBit(); if ($leftTopBlack === null || $rightBottomBlack == null) { throw NotFoundException::getNotFoundInstance(); } $moduleSize = self::moduleSize($leftTopBlack, $image); $top = $leftTopBlack[1]; $bottom = $rightBottomBlack[1]; $left = $leftTopBlack[0]; $right = $rightBottomBlack[0]; // Sanity check! if ($left >= $right || $top >= $bottom) { throw NotFoundException::getNotFoundInstance(); } if ($bottom - $top != $right - $left) { // Special case, where bottom-right module wasn't black so we found something else in the last row // Assume it's a square, so use height as the width $right = $left + ($bottom - $top); } $matrixWidth = round(($right - $left + 1) / $moduleSize); $matrixHeight = round(($bottom - $top + 1) / $moduleSize); if ($matrixWidth <= 0 || $matrixHeight <= 0) { throw NotFoundException::getNotFoundInstance(); } if ($matrixHeight != $matrixWidth) { // Only possibly decode square regions throw NotFoundException::getNotFoundInstance(); } // Push in the "border" by half the module width so that we start // sampling in the middle of the module. Just in case the image is a // little off, this will help recover. $nudge = (int)($moduleSize / 2.0);// $nudge = (int) ($moduleSize / 2.0f); $top += $nudge; $left += $nudge; // But careful that this does not sample off the edge // "right" is the farthest-right valid pixel location -- right+1 is not necessarily // This is positive by how much the inner x loop below would be too large $nudgedTooFarRight = $left + (int)(($matrixWidth - 1) * $moduleSize) - $right; if ($nudgedTooFarRight > 0) { if ($nudgedTooFarRight > $nudge) { // Neither way fits; abort throw NotFoundException::getNotFoundInstance(); } $left -= $nudgedTooFarRight; } // See logic above $nudgedTooFarDown = $top + (int)(($matrixHeight - 1) * $moduleSize) - $bottom; if ($nudgedTooFarDown > 0) { if ($nudgedTooFarDown > $nudge) { // Neither way fits; abort throw NotFoundException::getNotFoundInstance(); } $top -= $nudgedTooFarDown; } // Now just read off the bits $bits = new BitMatrix($matrixWidth, $matrixHeight); for ($y = 0; $y < $matrixHeight; $y++) { $iOffset = $top + (int)($y * $moduleSize); for ($x = 0; $x < $matrixWidth; $x++) { if ($image->get($left + (int)($x * $moduleSize), $iOffset)) { $bits->set($x, $y); } } } return $bits; } private static function moduleSize($leftTopBlack, BitMatrix $image) { $height = $image->getHeight(); $width = $image->getWidth(); $x = $leftTopBlack[0]; $y = $leftTopBlack[1]; /*$x = $leftTopBlack[0]; $y = $leftTopBlack[1];*/ $inBlack = true; $transitions = 0; while ($x < $width && $y < $height) { if ($inBlack != $image->get($x, $y)) { if (++$transitions == 5) { break; } $inBlack = !$inBlack; } $x++; $y++; } if ($x == $width || $y == $height) { throw NotFoundException::getNotFoundInstance(); } return ($x - $leftTopBlack[0]) / 7.0; //return ($x - $leftTopBlack[0]) / 7.0f; } public function reset() { // do nothing } protected final function getDecoder() { return $this->decoder; } }
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