| // Copyright 2014 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| // Original code is licensed as follows: |
| /* |
| * 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. |
| */ |
| |
| #include <memory> |
| |
| #include "xfa/fxbarcode/BC_BinaryBitmap.h" |
| #include "xfa/fxbarcode/BC_ResultPoint.h" |
| #include "xfa/fxbarcode/common/BC_CommonBitArray.h" |
| #include "xfa/fxbarcode/common/BC_CommonBitMatrix.h" |
| #include "xfa/fxbarcode/pdf417/BC_PDF417Detector.h" |
| #include "xfa/fxbarcode/pdf417/BC_PDF417DetectorResult.h" |
| #include "xfa/fxbarcode/utils.h" |
| |
| #define INTEGER_MAX 2147483647 |
| |
| int32_t CBC_Detector::INDEXES_START_PATTERN[] = {0, 4, 1, 5}; |
| int32_t CBC_Detector::INDEXES_STOP_PATTERN[] = {6, 2, 7, 3}; |
| int32_t CBC_Detector::INTEGER_MATH_SHIFT = 8; |
| int32_t CBC_Detector::PATTERN_MATCH_RESULT_SCALE_FACTOR = 1 |
| << INTEGER_MATH_SHIFT; |
| int32_t CBC_Detector::MAX_AVG_VARIANCE = |
| (int32_t)(PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.42f); |
| int32_t CBC_Detector::MAX_INDIVIDUAL_VARIANCE = |
| (int32_t)(PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.8f); |
| int32_t CBC_Detector::START_PATTERN[] = {8, 1, 1, 1, 1, 1, 1, 3}; |
| int32_t CBC_Detector::STOP_PATTERN[] = {7, 1, 1, 3, 1, 1, 1, 2, 1}; |
| int32_t CBC_Detector::MAX_PIXEL_DRIFT = 3; |
| int32_t CBC_Detector::MAX_PATTERN_DRIFT = 5; |
| int32_t CBC_Detector::SKIPPED_ROW_COUNT_MAX = 25; |
| int32_t CBC_Detector::ROW_STEP = 5; |
| int32_t CBC_Detector::BARCODE_MIN_HEIGHT = 10; |
| |
| CBC_Detector::CBC_Detector() {} |
| CBC_Detector::~CBC_Detector() {} |
| |
| CBC_PDF417DetectorResult* CBC_Detector::detect(CBC_BinaryBitmap* image, |
| int32_t hints, |
| FX_BOOL multiple, |
| int32_t& e) { |
| CBC_CommonBitMatrix* bitMatrix = image->GetBlackMatrix(e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| CBC_ResultPointArrayArray* barcodeCoordinates = detect(multiple, bitMatrix); |
| if (barcodeCoordinates->GetSize() == 0) { |
| rotate180(bitMatrix); |
| barcodeCoordinates = detect(multiple, bitMatrix); |
| } |
| if (barcodeCoordinates->GetSize() == 0) { |
| e = BCExceptionUnSupportedBarcode; |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| } |
| return new CBC_PDF417DetectorResult(bitMatrix, barcodeCoordinates); |
| } |
| void CBC_Detector::rotate180(CBC_CommonBitMatrix* bitMatrix) { |
| int32_t width = bitMatrix->GetWidth(); |
| int32_t height = bitMatrix->GetHeight(); |
| CBC_CommonBitArray* firstRowBitArray = new CBC_CommonBitArray(width); |
| CBC_CommonBitArray* secondRowBitArray = new CBC_CommonBitArray(width); |
| CBC_CommonBitArray* tmpBitArray = new CBC_CommonBitArray(width); |
| for (int32_t y = 0; y<(height + 1)>> 1; y++) { |
| CBC_CommonBitArray* temp = |
| bitMatrix->GetRow(height - 1 - y, secondRowBitArray); |
| CBC_CommonBitArray* tempfirstRow = firstRowBitArray; |
| firstRowBitArray = bitMatrix->GetRow(y, tempfirstRow); |
| delete tempfirstRow; |
| CBC_CommonBitArray* row = mirror(temp, tmpBitArray); |
| delete temp; |
| bitMatrix->SetRow(y, row); |
| delete row; |
| CBC_CommonBitArray* rowfirstRow = mirror(firstRowBitArray, tmpBitArray); |
| bitMatrix->SetRow(height - 1 - y, rowfirstRow); |
| delete rowfirstRow; |
| } |
| delete tmpBitArray; |
| delete firstRowBitArray; |
| delete secondRowBitArray; |
| } |
| CBC_CommonBitArray* CBC_Detector::mirror(CBC_CommonBitArray* input, |
| CBC_CommonBitArray* result) { |
| CBC_CommonBitArray* array = new CBC_CommonBitArray(result->GetSize()); |
| array->Clear(); |
| int32_t size = input->GetSize(); |
| for (int32_t i = 0; i < size; i++) { |
| if (input->Get(i)) { |
| array->Set(size - 1 - i); |
| } |
| } |
| return array; |
| } |
| |
| CBC_ResultPointArrayArray* CBC_Detector::detect( |
| FX_BOOL multiple, |
| CBC_CommonBitMatrix* bitMatrix) { |
| CBC_ResultPointArrayArray* barcodeCoordinates = new CBC_ResultPointArrayArray; |
| int32_t row = 0; |
| int32_t column = 0; |
| FX_BOOL foundBarcodeInRow = FALSE; |
| while (row < bitMatrix->GetHeight()) { |
| CBC_ResultPointArray* vertices = findVertices(bitMatrix, row, column); |
| if (!vertices->GetAt(0) && !vertices->GetAt(3)) { |
| if (!foundBarcodeInRow) { |
| delete vertices; |
| break; |
| } |
| foundBarcodeInRow = FALSE; |
| column = 0; |
| for (int32_t i = 0; i < barcodeCoordinates->GetSize(); i++) { |
| CBC_ResultPointArray* barcodeCoordinate = barcodeCoordinates->GetAt(i); |
| if (barcodeCoordinate->GetAt(1)) { |
| row = row > barcodeCoordinate->GetAt(1)->GetY(); |
| } |
| if (barcodeCoordinate->GetAt(3)) { |
| row = row > barcodeCoordinate->GetAt(3)->GetY(); |
| } |
| } |
| row += ROW_STEP; |
| delete vertices; |
| continue; |
| } |
| foundBarcodeInRow = TRUE; |
| barcodeCoordinates->Add(vertices); |
| if (!multiple) { |
| break; |
| } |
| if (vertices->GetAt(2)) { |
| column = (int32_t)vertices->GetAt(2)->GetX(); |
| row = (int32_t)vertices->GetAt(2)->GetY(); |
| } else { |
| column = (int32_t)vertices->GetAt(4)->GetX(); |
| row = (int32_t)vertices->GetAt(4)->GetY(); |
| } |
| } |
| return barcodeCoordinates; |
| } |
| |
| CBC_ResultPointArray* CBC_Detector::findVertices(CBC_CommonBitMatrix* matrix, |
| int32_t startRow, |
| int32_t startColumn) { |
| int32_t height = matrix->GetHeight(); |
| int32_t width = matrix->GetWidth(); |
| CBC_ResultPointArray* result = new CBC_ResultPointArray; |
| result->SetSize(8); |
| std::unique_ptr<CBC_ResultPointArray> startptr( |
| findRowsWithPattern(matrix, height, width, startRow, startColumn, |
| START_PATTERN, FX_ArraySize(START_PATTERN))); |
| copyToResult(result, startptr.get(), INDEXES_START_PATTERN, |
| FX_ArraySize(INDEXES_START_PATTERN)); |
| if (result->GetAt(4)) { |
| startColumn = (int32_t)result->GetAt(4)->GetX(); |
| startRow = (int32_t)result->GetAt(4)->GetY(); |
| } |
| std::unique_ptr<CBC_ResultPointArray> stopptr( |
| findRowsWithPattern(matrix, height, width, startRow, startColumn, |
| STOP_PATTERN, FX_ArraySize(STOP_PATTERN))); |
| copyToResult(result, stopptr.get(), INDEXES_STOP_PATTERN, |
| FX_ArraySize(INDEXES_STOP_PATTERN)); |
| return result; |
| } |
| |
| void CBC_Detector::copyToResult(CBC_ResultPointArray* result, |
| CBC_ResultPointArray* tmpResult, |
| int32_t* destinationIndexes, |
| int32_t destinationLength) { |
| for (int32_t i = 0; i < destinationLength; i++) { |
| result->SetAt(destinationIndexes[i], tmpResult->GetAt(i)); |
| } |
| } |
| |
| CBC_ResultPointArray* CBC_Detector::findRowsWithPattern( |
| CBC_CommonBitMatrix* matrix, |
| int32_t height, |
| int32_t width, |
| int32_t startRow, |
| int32_t startColumn, |
| int32_t* pattern, |
| int32_t patternLength) { |
| CBC_ResultPointArray* result = new CBC_ResultPointArray; |
| result->SetSize(4); |
| FX_BOOL found = FALSE; |
| CFX_Int32Array counters; |
| counters.SetSize(patternLength); |
| for (; startRow < height; startRow += ROW_STEP) { |
| CFX_Int32Array* loc = |
| findGuardPattern(matrix, startColumn, startRow, width, FALSE, pattern, |
| patternLength, counters); |
| if (loc) { |
| while (startRow > 0) { |
| CFX_Int32Array* previousRowLoc = |
| findGuardPattern(matrix, startColumn, --startRow, width, FALSE, |
| pattern, patternLength, counters); |
| if (previousRowLoc) { |
| delete loc; |
| loc = previousRowLoc; |
| } else { |
| startRow++; |
| break; |
| } |
| } |
| result->SetAt( |
| 0, new CBC_ResultPoint((FX_FLOAT)loc->GetAt(0), (FX_FLOAT)startRow)); |
| result->SetAt( |
| 1, new CBC_ResultPoint((FX_FLOAT)loc->GetAt(1), (FX_FLOAT)startRow)); |
| found = TRUE; |
| delete loc; |
| break; |
| } |
| } |
| int32_t stopRow = startRow + 1; |
| if (found) { |
| int32_t skippedRowCount = 0; |
| CFX_Int32Array previousRowLoc; |
| previousRowLoc.Add((int32_t)result->GetAt(0)->GetX()); |
| previousRowLoc.Add((int32_t)result->GetAt(1)->GetX()); |
| for (; stopRow < height; stopRow++) { |
| CFX_Int32Array* loc = |
| findGuardPattern(matrix, previousRowLoc[0], stopRow, width, FALSE, |
| pattern, patternLength, counters); |
| if (loc && abs(previousRowLoc[0] - loc->GetAt(0)) < MAX_PATTERN_DRIFT && |
| abs(previousRowLoc[1] - loc->GetAt(1)) < MAX_PATTERN_DRIFT) { |
| previousRowLoc.Copy(*loc); |
| skippedRowCount = 0; |
| } else { |
| if (skippedRowCount > SKIPPED_ROW_COUNT_MAX) { |
| delete loc; |
| break; |
| } else { |
| skippedRowCount++; |
| } |
| } |
| delete loc; |
| } |
| stopRow -= skippedRowCount + 1; |
| result->SetAt(2, new CBC_ResultPoint((FX_FLOAT)previousRowLoc.GetAt(0), |
| (FX_FLOAT)stopRow)); |
| result->SetAt(3, new CBC_ResultPoint((FX_FLOAT)previousRowLoc.GetAt(1), |
| (FX_FLOAT)stopRow)); |
| } |
| if (stopRow - startRow < BARCODE_MIN_HEIGHT) { |
| for (int32_t i = 0; i < result->GetSize(); i++) { |
| result->SetAt(i, nullptr); |
| } |
| } |
| return result; |
| } |
| CFX_Int32Array* CBC_Detector::findGuardPattern(CBC_CommonBitMatrix* matrix, |
| int32_t column, |
| int32_t row, |
| int32_t width, |
| FX_BOOL whiteFirst, |
| int32_t* pattern, |
| int32_t patternLength, |
| CFX_Int32Array& counters) { |
| for (int32_t i = 0; i < counters.GetSize(); i++) { |
| counters.SetAt(i, 0); |
| } |
| FX_BOOL isWhite = whiteFirst; |
| int32_t patternStart = column; |
| int32_t pixelDrift = 0; |
| CFX_Int32Array* intarray = new CFX_Int32Array; |
| while (matrix->Get(patternStart, row) && patternStart > 0 && |
| pixelDrift++ < MAX_PIXEL_DRIFT) { |
| patternStart--; |
| } |
| int32_t x = patternStart; |
| int32_t counterPosition = 0; |
| for (; x < width; x++) { |
| FX_BOOL pixel = matrix->Get(x, row); |
| if (pixel ^ isWhite) { |
| counters[counterPosition]++; |
| } else { |
| if (counterPosition == patternLength - 1) { |
| if (patternMatchVariance(counters, pattern, MAX_INDIVIDUAL_VARIANCE) < |
| MAX_AVG_VARIANCE) { |
| intarray->Add(patternStart); |
| intarray->Add(x); |
| return intarray; |
| } |
| patternStart += counters[0] + counters[1]; |
| for (int32_t l = 2, k = 0; l < patternLength; l++, k++) { |
| counters.SetAt(k, counters.GetAt(l)); |
| } |
| counters.SetAt(patternLength - 2, 0); |
| counters.SetAt(patternLength - 1, 0); |
| counterPosition--; |
| } else { |
| counterPosition++; |
| } |
| counters[counterPosition] = 1; |
| isWhite = !isWhite; |
| } |
| } |
| if (counterPosition == patternLength - 1) { |
| if (patternMatchVariance(counters, pattern, MAX_INDIVIDUAL_VARIANCE) < |
| MAX_AVG_VARIANCE) { |
| intarray->Add(patternStart); |
| intarray->Add(x - 1); |
| return intarray; |
| } |
| } |
| delete intarray; |
| return nullptr; |
| } |
| int32_t CBC_Detector::patternMatchVariance(CFX_Int32Array& counters, |
| int32_t* pattern, |
| int32_t maxIndividualVariance) { |
| int32_t numCounters = counters.GetSize(); |
| int32_t total = 0; |
| int32_t patternLength = 0; |
| for (int32_t i = 0; i < numCounters; i++) { |
| total += counters[i]; |
| patternLength += pattern[i]; |
| } |
| if (total < patternLength) { |
| return INTEGER_MAX; |
| } |
| int32_t unitBarWidth = (total << INTEGER_MATH_SHIFT) / patternLength; |
| maxIndividualVariance = |
| (maxIndividualVariance * unitBarWidth) >> INTEGER_MATH_SHIFT; |
| int32_t totalVariance = 0; |
| for (int32_t x = 0; x < numCounters; x++) { |
| int32_t counter = counters[x] << INTEGER_MATH_SHIFT; |
| int32_t scaledPattern = pattern[x] * unitBarWidth; |
| int32_t variance = counter > scaledPattern ? counter - scaledPattern |
| : scaledPattern - counter; |
| if (variance > maxIndividualVariance) { |
| return INTEGER_MAX; |
| } |
| totalVariance += variance; |
| } |
| return totalVariance / total; |
| } |
