summaryrefslogtreecommitdiff
path: root/xfa/src/fxbarcode/src/BC_PDF417Detector.cpp
blob: c9f67b6d7e9c59875cb1f6144cf6181bcfdc939a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
// 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;
}