diff options
Diffstat (limited to 'xfa/src/fxbarcode/pdf417/BC_PDF417Detector.cpp')
| -rw-r--r-- | xfa/src/fxbarcode/pdf417/BC_PDF417Detector.cpp | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/xfa/src/fxbarcode/pdf417/BC_PDF417Detector.cpp b/xfa/src/fxbarcode/pdf417/BC_PDF417Detector.cpp new file mode 100644 index 0000000000..8d1a86ec92 --- /dev/null +++ b/xfa/src/fxbarcode/pdf417/BC_PDF417Detector.cpp @@ -0,0 +1,311 @@ +// 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
+FX_INT32 CBC_Detector::INDEXES_START_PATTERN[] = {0, 4, 1, 5};
+FX_INT32 CBC_Detector::INDEXES_STOP_PATTERN[] = {6, 2, 7, 3};
+FX_INT32 CBC_Detector::INTEGER_MATH_SHIFT = 8;
+FX_INT32 CBC_Detector::PATTERN_MATCH_RESULT_SCALE_FACTOR = 1 << INTEGER_MATH_SHIFT;
+FX_INT32 CBC_Detector::MAX_AVG_VARIANCE = (FX_INT32) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.42f);
+FX_INT32 CBC_Detector::MAX_INDIVIDUAL_VARIANCE = (FX_INT32) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.8f);
+FX_INT32 CBC_Detector::START_PATTERN[] = {8, 1, 1, 1, 1, 1, 1, 3};
+FX_INT32 CBC_Detector::STOP_PATTERN[] = {7, 1, 1, 3, 1, 1, 1, 2, 1};
+FX_INT32 CBC_Detector::MAX_PIXEL_DRIFT = 3;
+FX_INT32 CBC_Detector::MAX_PATTERN_DRIFT = 5;
+FX_INT32 CBC_Detector::SKIPPED_ROW_COUNT_MAX = 25;
+FX_INT32 CBC_Detector::ROW_STEP = 5;
+FX_INT32 CBC_Detector::BARCODE_MIN_HEIGHT = 10;
+CBC_Detector::CBC_Detector()
+{
+}
+CBC_Detector::~CBC_Detector()
+{
+}
+CBC_PDF417DetectorResult* CBC_Detector::detect(CBC_BinaryBitmap* image, FX_INT32 hints, FX_BOOL multiple, FX_INT32 &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 = FX_NEW CBC_PDF417DetectorResult(bitMatrix, barcodeCoordinates);
+ return detectorResult;
+}
+void CBC_Detector::rotate180(CBC_CommonBitMatrix* bitMatrix)
+{
+ FX_INT32 width = bitMatrix->GetWidth();
+ FX_INT32 height = bitMatrix->GetHeight();
+ CBC_CommonBitArray* firstRowBitArray = FX_NEW CBC_CommonBitArray(width);
+ CBC_CommonBitArray* secondRowBitArray = FX_NEW CBC_CommonBitArray(width);
+ CBC_CommonBitArray* tmpBitArray = FX_NEW CBC_CommonBitArray(width);
+ for (FX_INT32 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 = FX_NEW CBC_CommonBitArray(result->GetSize());
+ array->Clear();
+ FX_INT32 size = input->GetSize();
+ for (FX_INT32 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 = FX_NEW CFX_PtrArray;
+ FX_INT32 row = 0;
+ FX_INT32 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 (FX_INT32 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 = (FX_INT32) ((CBC_ResultPoint*)vertices->GetAt(2))->GetX();
+ row = (FX_INT32) ((CBC_ResultPoint*)vertices->GetAt(2))->GetY();
+ } else {
+ column = (FX_INT32) ((CBC_ResultPoint*)vertices->GetAt(4))->GetX();
+ row = (FX_INT32) ((CBC_ResultPoint*)vertices->GetAt(4))->GetY();
+ }
+ }
+ return barcodeCoordinates;
+}
+CFX_PtrArray* CBC_Detector::findVertices(CBC_CommonBitMatrix* matrix, FX_INT32 startRow, FX_INT32 startColumn)
+{
+ FX_INT32 height = matrix->GetHeight();
+ FX_INT32 width = matrix->GetWidth();
+ CFX_PtrArray* result = FX_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 = (FX_INT32) ((CBC_ResultPoint*)result->GetAt(4))->GetX();
+ startRow = (FX_INT32) ((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, FX_INT32* destinationIndexes, FX_INT32 destinationLength)
+{
+ for (FX_INT32 i = 0; i < destinationLength; i++) {
+ result->SetAt(destinationIndexes[i], tmpResult->GetAt(i));
+ }
+}
+CFX_PtrArray* CBC_Detector::findRowsWithPattern(CBC_CommonBitMatrix* matrix, FX_INT32 height, FX_INT32 width, FX_INT32 startRow, FX_INT32 startColumn, FX_INT32* pattern, FX_INT32 patternLength)
+{
+ CFX_PtrArray* result = FX_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, FX_NEW CBC_ResultPoint((FX_FLOAT)loc->GetAt(0), (FX_FLOAT)startRow));
+ result->SetAt(1, FX_NEW CBC_ResultPoint((FX_FLOAT)loc->GetAt(1), (FX_FLOAT)startRow));
+ found = TRUE;
+ delete loc;
+ break;
+ }
+ }
+ FX_INT32 stopRow = startRow + 1;
+ if (found) {
+ FX_INT32 skippedRowCount = 0;
+ CFX_Int32Array previousRowLoc;
+ previousRowLoc.Add((FX_INT32)((CBC_ResultPoint*)result->GetAt(0))->GetX());
+ previousRowLoc.Add((FX_INT32)((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, FX_NEW CBC_ResultPoint((FX_FLOAT)previousRowLoc.GetAt(0), (FX_FLOAT)stopRow));
+ result->SetAt(3, FX_NEW CBC_ResultPoint((FX_FLOAT)previousRowLoc.GetAt(1), (FX_FLOAT)stopRow));
+ }
+ if (stopRow - startRow < BARCODE_MIN_HEIGHT) {
+ for (FX_INT32 i = 0; i < result->GetSize(); i++) {
+ result->SetAt(i, NULL);
+ }
+ }
+ return result;
+}
+CFX_Int32Array* CBC_Detector::findGuardPattern(CBC_CommonBitMatrix* matrix, FX_INT32 column, FX_INT32 row, FX_INT32 width, FX_BOOL whiteFirst, FX_INT32* pattern, FX_INT32 patternLength, CFX_Int32Array &counters)
+{
+ for (FX_INT32 i = 0; i < counters.GetSize(); i++) {
+ counters.SetAt(i, 0);
+ }
+ FX_BOOL isWhite = whiteFirst;
+ FX_INT32 patternStart = column;
+ FX_INT32 pixelDrift = 0;
+ CFX_Int32Array* intarray = FX_NEW CFX_Int32Array;
+ while (matrix->Get(patternStart, row) && patternStart > 0 && pixelDrift++ < MAX_PIXEL_DRIFT) {
+ patternStart--;
+ }
+ FX_INT32 x = patternStart;
+ FX_INT32 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 (FX_INT32 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;
+}
+FX_INT32 CBC_Detector::patternMatchVariance(CFX_Int32Array &counters, FX_INT32* pattern, FX_INT32 maxIndividualVariance)
+{
+ FX_INT32 numCounters = counters.GetSize();
+ FX_INT32 total = 0;
+ FX_INT32 patternLength = 0;
+ for (FX_INT32 i = 0; i < numCounters; i++) {
+ total += counters[i];
+ patternLength += pattern[i];
+ }
+ if (total < patternLength) {
+ return INTERGER_MAX;
+ }
+ FX_INT32 unitBarWidth = (total << INTEGER_MATH_SHIFT) / patternLength;
+ maxIndividualVariance = (maxIndividualVariance * unitBarWidth) >> INTEGER_MATH_SHIFT;
+ FX_INT32 totalVariance = 0;
+ for (FX_INT32 x = 0; x < numCounters; x++) {
+ FX_INT32 counter = counters[x] << INTEGER_MATH_SHIFT;
+ FX_INT32 scaledPattern = pattern[x] * unitBarWidth;
+ FX_INT32 variance = counter > scaledPattern ? counter - scaledPattern : scaledPattern - counter;
+ if (variance > maxIndividualVariance) {
+ return INTERGER_MAX;
+ }
+ totalVariance += variance;
+ }
+ return totalVariance / total;
+}
+
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