67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
/*
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* Copyright 2016 Nu-book Inc.
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* Copyright 2016 ZXing authors
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*/
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// SPDX-License-Identifier: Apache-2.0
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#include "MCReader.h"
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#include "BinaryBitmap.h"
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#include "BitMatrix.h"
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#include "DecoderResult.h"
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#include "DetectorResult.h"
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#include "MCBitMatrixParser.h"
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#include "MCDecoder.h"
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#include "Barcode.h"
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namespace ZXing::MaxiCode {
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/**
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* This method detects a code in a "pure" image -- that is, pure monochrome image
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* which contains only an unrotated, unskewed, image of a code, with some white border
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* around it. This is a specialized method that works exceptionally fast in this special
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* case.
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*/
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static BitMatrix ExtractPureBits(const BitMatrix& image)
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{
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int left, top, width, height;
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if (!image.findBoundingBox(left, top, width, height, BitMatrixParser::MATRIX_WIDTH))
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return {};
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// Now just read off the bits
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BitMatrix result(BitMatrixParser::MATRIX_WIDTH, BitMatrixParser::MATRIX_HEIGHT);
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for (int y = 0; y < BitMatrixParser::MATRIX_HEIGHT; y++) {
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int iy = top + (y * height + height / 2) / BitMatrixParser::MATRIX_HEIGHT;
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for (int x = 0; x < BitMatrixParser::MATRIX_WIDTH; x++) {
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int ix = left + (x * width + width / 2 + (y & 0x01) * width / 2) / BitMatrixParser::MATRIX_WIDTH;
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if (image.get(ix, iy)) {
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result.set(x, y);
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}
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}
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}
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//TODO: need to return position info
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return result;
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}
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Barcode Reader::decode(const BinaryBitmap& image) const
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{
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auto binImg = image.getBitMatrix();
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if (binImg == nullptr)
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return {};
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//TODO: this only works with effectively 'pure' barcodes. Needs proper detector.
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BitMatrix bits = ExtractPureBits(*binImg);
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if (bits.empty())
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return {};
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DecoderResult decRes = Decode(bits);
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// TODO: before we can meaningfully return a ChecksumError result, we need to check the center for the presence of the finder pattern
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if (!decRes.isValid())
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return {};
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return Barcode(std::move(decRes), DetectorResult{}, BarcodeFormat::MaxiCode);
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}
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} // namespace ZXing::MaxiCode
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