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// 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
#include "barcode.h"
#include "include/BC_ResultPoint.h"
#include "include/BC_PDF417DetectorResult.h"
#include "include/BC_BinaryBitmap.h"
#include "include/BC_CommonBitMatrix.h"
#include "include/BC_CommonBitArray.h"
#include "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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