datamatrix reader

src/datamatrix/data_matrix_reader.rs

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+/*
+ * 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.
+ */
+
+use std::collections::HashMap;
+
+use crate::{Reader, Exceptions, common::{BitMatrix, DetectorRXingResult}, RXingResultPoint, DecodeHintType, RXingResult, BarcodeFormat, RXingResultMetadataType, RXingResultMetadataValue};
+
+use super::{detector::Detector, decoder::Decoder};
+
+use  lazy_static::lazy_static;
+
+lazy_static!{
+  static ref decoder : Decoder = Decoder::new();
+}
+
+/**
+ * This implementation can detect and decode Data Matrix codes in an image.
+ *
+ * @author bbrown@google.com (Brian Brown)
+ */
+pub struct DataMatrixReader;
+
+  // private static final RXingResultPoint[] NO_POINTS = new RXingResultPoint[0];
+
+  // private final Decoder decoder = new Decoder();
+
+  impl Reader for DataMatrixReader {
+
+    /**
+   * Locates and decodes a Data Matrix code in an image.
+   *
+   * @return a String representing the content encoded by the Data Matrix code
+   * @throws NotFoundException if a Data Matrix code cannot be found
+   * @throws FormatException if a Data Matrix code cannot be decoded
+   * @throws ChecksumException if error correction fails
+   */
+    fn decode(&mut self, image: &crate::BinaryBitmap) -> Result<crate::RXingResult, crate::Exceptions> {
+      self.decode_with_hints(image,&HashMap::new())
+    }
+
+    /**
+   * Locates and decodes a Data Matrix code in an image.
+   *
+   * @return a String representing the content encoded by the Data Matrix code
+   * @throws NotFoundException if a Data Matrix code cannot be found
+   * @throws FormatException if a Data Matrix code cannot be decoded
+   * @throws ChecksumException if error correction fails
+   */
+    fn decode_with_hints(
+        &mut self,
+        image: &crate::BinaryBitmap,
+        hints: &crate::DecodingHintDictionary,
+    ) -> Result<crate::RXingResult, crate::Exceptions> {
+      let decoderRXingResult;
+      let mut points = Vec::new();
+      if hints.contains_key(&DecodeHintType::PURE_BARCODE) {
+        let bits = self.extractPureBits(image.getBlackMatrix())?;
+        decoderRXingResult = decoder.decode(&bits)?;
+        points.clear();
+      } else {
+        let detectorRXingResult =  Detector::new(image.getBlackMatrix().clone())?.detect()?;
+        decoderRXingResult = decoder.decode(detectorRXingResult.getBits())?;
+        points = detectorRXingResult.getPoints().clone();
+      }
+      let mut result =  RXingResult::new(decoderRXingResult.getText().clone(), decoderRXingResult.getRawBytes().clone(), points.clone(),
+          BarcodeFormat::DATA_MATRIX);
+      let byteSegments = decoderRXingResult.getByteSegments();
+      if !byteSegments.is_empty() {
+        result.putMetadata(RXingResultMetadataType::BYTE_SEGMENTS, RXingResultMetadataValue::ByteSegments(byteSegments.clone()));
+      }
+      let ecLevel = decoderRXingResult.getECLevel();
+      if !ecLevel.is_empty() {
+        result.putMetadata(RXingResultMetadataType::ERROR_CORRECTION_LEVEL, RXingResultMetadataValue::ErrorCorrectionLevel(ecLevel.to_string()));
+      }
+      result.putMetadata(RXingResultMetadataType::SYMBOLOGY_IDENTIFIER, RXingResultMetadataValue::SymbologyIdentifier(format!("]d{}" , decoderRXingResult.getSymbologyModifier())));
+       
+      Ok(result)
+    }
+
+    fn reset(&mut self) {
+        // do nothing
+    }
+}
+
+  
+  
+
+  impl DataMatrixReader {
+
+  /**
+   * 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.
+   */
+  fn  extractPureBits(&self, image:&BitMatrix) -> Result<BitMatrix,Exceptions> {
+
+    let Some(leftTopBlack) = image.getTopLeftOnBit() else {
+      return Err(Exceptions::NotFoundException("".to_owned()))
+    };
+    let Some(rightBottomBlack) = image.getBottomRightOnBit()else {
+      return Err(Exceptions::NotFoundException("".to_owned()))
+    };
+
+    let moduleSize = Self::moduleSize(&leftTopBlack, image)?;
+
+    let mut top = leftTopBlack[1];
+    let bottom = rightBottomBlack[1];
+    let mut left = leftTopBlack[0];
+    let right = rightBottomBlack[0];
+
+    let matrixWidth = (right - left + 1) / moduleSize;
+    let matrixHeight = (bottom - top + 1) / moduleSize;
+    if matrixWidth <= 0 || matrixHeight <= 0 {
+      return Err(Exceptions::NotFoundException("".to_owned()))
+      // 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.
+    let nudge = moduleSize / 2;
+    top += nudge;
+    left += nudge;
+
+    // Now just read off the bits
+    let mut bits = BitMatrix::new(matrixWidth, matrixHeight)?;
+    for y in 0..matrixHeight {
+    // for (int y = 0; y < matrixHeight; y++) {
+      let iOffset = top + y * moduleSize;
+      for x in 0..matrixWidth {
+      // for (int x = 0; x < matrixWidth; x++) {
+        if image.get(left + x * moduleSize, iOffset) {
+          bits.set(x, y);
+        }
+      }
+    }
+    Ok( bits)
+  }
+
+  fn moduleSize( leftTopBlack:&[u32],  image:&BitMatrix) -> Result<u32,Exceptions> {
+    let width = image.getWidth();
+    let mut x = leftTopBlack[0];
+    let y = leftTopBlack[1];
+    while x < width && image.get(x, y) {
+      x+=1;
+    }
+    if x == width {
+      return Err(Exceptions::NotFoundException("".to_owned()))
+    }
+
+    let moduleSize = x - leftTopBlack[0];
+    if moduleSize == 0 {
+      return Err(Exceptions::NotFoundException("".to_owned()))
+    }
+     
+    Ok(moduleSize)
+  }
+
+}