ByQuadrantReader.cpp Example File

 /*
  *  Copyright 2011 ZXing authors All rights reserved.
  *
  * 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.
  */

 #include <zxing/multi/ByQuadrantReader.h>
 #include <zxing/ReaderException.h>

 namespace zxing {
 namespace multi {

 ByQuadrantReader::ByQuadrantReader(Reader& delegate) : delegate_(delegate) {}

 ByQuadrantReader::~ByQuadrantReader(){}

 Ref<Result> ByQuadrantReader::decode(Ref<BinaryBitmap> image){
   return decode(image, DecodeHints::DEFAULT_HINT);
 }

 Ref<Result> ByQuadrantReader::decode(Ref<BinaryBitmap> image, DecodeHints hints){
   int width = image->getWidth();
   int height = image->getHeight();
   int halfWidth = width / 2;
   int halfHeight = height / 2;
   Ref<BinaryBitmap> topLeft = image->crop(0, 0, halfWidth, halfHeight);
   try {
     return delegate_.decode(topLeft, hints);
   } catch (ReaderException const& re) {
     (void)re;
     // continue
   }

   Ref<BinaryBitmap> topRight = image->crop(halfWidth, 0, halfWidth, halfHeight);
   try {
     return delegate_.decode(topRight, hints);
   } catch (ReaderException const& re) {
     (void)re;
     // continue
   }

   Ref<BinaryBitmap> bottomLeft = image->crop(0, halfHeight, halfWidth, halfHeight);
   try {
     return delegate_.decode(bottomLeft, hints);
   } catch (ReaderException const& re) {
     (void)re;
     // continue
   }

   Ref<BinaryBitmap> bottomRight = image->crop(halfWidth, halfHeight, halfWidth, halfHeight);
   try {
     return delegate_.decode(bottomRight, hints);
   } catch (ReaderException const& re) {
     (void)re;
     // continue
   }

   int quarterWidth = halfWidth / 2;
   int quarterHeight = halfHeight / 2;
   Ref<BinaryBitmap> center = image->crop(quarterWidth, quarterHeight, halfWidth, halfHeight);
   return delegate_.decode(center, hints);
 }

 } // End zxing::multi namespace
 } // End zxing namespace