| // 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 "../barcode.h" | |
| #include "../BC_ResultPoint.h" | |
| #include "../BC_BinaryBitmap.h" | |
| #include "../common/BC_CommonBitMatrix.h" | |
| #include "../common/BC_CommonBitArray.h" | |
| #include "BC_PDF417DetectorResult.h" | |
| #include "BC_PDF417Detector.h" | |
| #define INTERGER_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, NULL); | |
| CFX_PtrArray* 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, NULL); | |
| } | |
| CBC_PDF417DetectorResult* detectorResult = | |
| new CBC_PDF417DetectorResult(bitMatrix, barcodeCoordinates); | |
| return detectorResult; | |
| } | |
| 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; | |
| } | |
| CFX_PtrArray* CBC_Detector::detect(FX_BOOL multiple, | |
| CBC_CommonBitMatrix* bitMatrix) { | |
| CFX_PtrArray* barcodeCoordinates = new CFX_PtrArray; | |
| int32_t row = 0; | |
| int32_t column = 0; | |
| FX_BOOL foundBarcodeInRow = FALSE; | |
| while (row < bitMatrix->GetHeight()) { | |
| CFX_PtrArray* vertices = findVertices(bitMatrix, row, column); | |
| if (vertices->GetAt(0) == NULL && vertices->GetAt(3) == NULL) { | |
| if (!foundBarcodeInRow) { | |
| if (vertices) { | |
| delete (vertices); | |
| } | |
| break; | |
| } | |
| foundBarcodeInRow = FALSE; | |
| column = 0; | |
| for (int32_t i = 0; i < barcodeCoordinates->GetSize(); i++) { | |
| CFX_PtrArray* barcodeCoordinate = | |
| (CFX_PtrArray*)barcodeCoordinates->GetAt(i); | |
| if (barcodeCoordinate->GetAt(1) != NULL) { | |
| row = row > ((CBC_ResultPoint*)barcodeCoordinate->GetAt(1))->GetY(); | |
| } | |
| if (barcodeCoordinate->GetAt(3) != NULL) { | |
| row = row > ((CBC_ResultPoint*)barcodeCoordinate->GetAt(3))->GetY(); | |
| } | |
| } | |
| row += ROW_STEP; | |
| if (vertices) { | |
| delete (vertices); | |
| } | |
| continue; | |
| } | |
| foundBarcodeInRow = TRUE; | |
| barcodeCoordinates->Add(vertices); | |
| if (!multiple) { | |
| break; | |
| } | |
| if (vertices->GetAt(2) != NULL) { | |
| column = (int32_t)((CBC_ResultPoint*)vertices->GetAt(2))->GetX(); | |
| row = (int32_t)((CBC_ResultPoint*)vertices->GetAt(2))->GetY(); | |
| } else { | |
| column = (int32_t)((CBC_ResultPoint*)vertices->GetAt(4))->GetX(); | |
| row = (int32_t)((CBC_ResultPoint*)vertices->GetAt(4))->GetY(); | |
| } | |
| } | |
| return barcodeCoordinates; | |
| } | |
| CFX_PtrArray* CBC_Detector::findVertices(CBC_CommonBitMatrix* matrix, | |
| int32_t startRow, | |
| int32_t startColumn) { | |
| int32_t height = matrix->GetHeight(); | |
| int32_t width = matrix->GetWidth(); | |
| CFX_PtrArray* result = new CFX_PtrArray; | |
| result->SetSize(8); | |
| CFX_PtrArray* startptr = findRowsWithPattern( | |
| matrix, height, width, startRow, startColumn, START_PATTERN, | |
| sizeof(START_PATTERN) / sizeof(START_PATTERN[0])); | |
| copyToResult( | |
| result, startptr, INDEXES_START_PATTERN, | |
| sizeof(INDEXES_START_PATTERN) / sizeof(INDEXES_START_PATTERN[0])); | |
| startptr->RemoveAll(); | |
| delete startptr; | |
| if (result->GetAt(4) != NULL) { | |
| startColumn = (int32_t)((CBC_ResultPoint*)result->GetAt(4))->GetX(); | |
| startRow = (int32_t)((CBC_ResultPoint*)result->GetAt(4))->GetY(); | |
| } | |
| CFX_PtrArray* stopptr = findRowsWithPattern( | |
| matrix, height, width, startRow, startColumn, STOP_PATTERN, | |
| sizeof(STOP_PATTERN) / sizeof(STOP_PATTERN[0])); | |
| copyToResult(result, stopptr, INDEXES_STOP_PATTERN, | |
| sizeof(INDEXES_STOP_PATTERN) / sizeof(INDEXES_STOP_PATTERN[0])); | |
| stopptr->RemoveAll(); | |
| delete stopptr; | |
| return result; | |
| } | |
| void CBC_Detector::copyToResult(CFX_PtrArray* result, | |
| CFX_PtrArray* tmpResult, | |
| int32_t* destinationIndexes, | |
| int32_t destinationLength) { | |
| for (int32_t i = 0; i < destinationLength; i++) { | |
| result->SetAt(destinationIndexes[i], tmpResult->GetAt(i)); | |
| } | |
| } | |
| CFX_PtrArray* CBC_Detector::findRowsWithPattern(CBC_CommonBitMatrix* matrix, | |
| int32_t height, | |
| int32_t width, | |
| int32_t startRow, | |
| int32_t startColumn, | |
| int32_t* pattern, | |
| int32_t patternLength) { | |
| CFX_PtrArray* result = new CFX_PtrArray; | |
| 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 != NULL) { | |
| while (startRow > 0) { | |
| CFX_Int32Array* previousRowLoc = | |
| findGuardPattern(matrix, startColumn, --startRow, width, FALSE, | |
| pattern, patternLength, counters); | |
| if (previousRowLoc != NULL) { | |
| 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)((CBC_ResultPoint*)result->GetAt(0))->GetX()); | |
| previousRowLoc.Add((int32_t)((CBC_ResultPoint*)result->GetAt(1))->GetX()); | |
| for (; stopRow < height; stopRow++) { | |
| CFX_Int32Array* loc = | |
| findGuardPattern(matrix, previousRowLoc[0], stopRow, width, FALSE, | |
| pattern, patternLength, counters); | |
| if (loc != NULL && | |
| 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, NULL); | |
| } | |
| } | |
| 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 NULL; | |
| } | |
| 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 INTERGER_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 INTERGER_MAX; | |
| } | |
| totalVariance += variance; | |
| } | |
| return totalVariance / total; | |
| } |