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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
// Original code is licensed as follows:
/*
* Copyright 2008 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 <algorithm>
#include "xfa/src/fxbarcode/barcode.h"
#include "xfa/src/fxbarcode/BC_Reader.h"
#include "xfa/src/fxbarcode/BC_BinaryBitmap.h"
#include "xfa/src/fxbarcode/common/BC_CommonBitArray.h"
#include "BC_OneDReader.h"
const int32_t CBC_OneDReader::INTEGER_MATH_SHIFT = 8;
const int32_t CBC_OneDReader::PATTERN_MATCH_RESULT_SCALE_FACTOR = 1 << 8;
CBC_OneDReader::CBC_OneDReader() {}
CBC_OneDReader::~CBC_OneDReader() {}
CFX_ByteString CBC_OneDReader::Decode(CBC_BinaryBitmap* image, int32_t& e) {
CFX_ByteString strtemp = Decode(image, 0, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
return strtemp;
}
CFX_ByteString CBC_OneDReader::Decode(CBC_BinaryBitmap* image,
int32_t hints,
int32_t& e) {
CFX_ByteString strtemp = DeDecode(image, hints, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
return strtemp;
}
CFX_ByteString CBC_OneDReader::DeDecode(CBC_BinaryBitmap* image,
int32_t hints,
int32_t& e) {
int32_t height = image->GetHeight();
CBC_CommonBitArray* row = NULL;
int32_t middle = height >> 1;
FX_BOOL tryHarder = FALSE;
int32_t rowStep = std::max(1, height >> (tryHarder ? 8 : 5));
int32_t maxLines;
if (tryHarder) {
maxLines = height;
} else {
maxLines = 15;
}
for (int32_t x = 0; x < maxLines; x++) {
int32_t rowStepsAboveOrBelow = (x + 1) >> 1;
FX_BOOL isAbove = (x & 0x01) == 0;
int32_t rowNumber =
middle +
rowStep * (isAbove ? rowStepsAboveOrBelow : -rowStepsAboveOrBelow);
if (rowNumber < 0 || rowNumber >= height) {
break;
}
row = image->GetBlackRow(rowNumber, NULL, e);
if (e != BCExceptionNO) {
e = BCExceptionNO;
if (row != NULL) {
delete row;
row = NULL;
}
continue;
}
for (int32_t attempt = 0; attempt < 2; attempt++) {
if (attempt == 1) {
row->Reverse();
}
CFX_ByteString result = DecodeRow(rowNumber, row, hints, e);
if (e != BCExceptionNO) {
e = BCExceptionNO;
continue;
}
if (row != NULL) {
delete row;
row = NULL;
}
return result;
}
if (row != NULL) {
delete row;
row = NULL;
}
}
e = BCExceptionNotFound;
return "";
}
void CBC_OneDReader::RecordPattern(CBC_CommonBitArray* row,
int32_t start,
CFX_Int32Array* counters,
int32_t& e) {
int32_t numCounters = counters->GetSize();
for (int32_t i = 0; i < numCounters; i++) {
(*counters)[i] = 0;
}
int32_t end = row->GetSize();
if (start >= end) {
e = BCExceptionNotFound;
return;
}
FX_BOOL isWhite = !row->Get(start);
int32_t counterPosition = 0;
int32_t j = start;
while (j < end) {
FX_BOOL pixel = row->Get(j);
if (pixel ^ isWhite) {
(*counters)[counterPosition]++;
} else {
counterPosition++;
if (counterPosition == numCounters) {
break;
} else {
(*counters)[counterPosition] = 1;
isWhite = !isWhite;
}
}
j++;
}
if (!(counterPosition == numCounters ||
(counterPosition == numCounters - 1 && j == end))) {
e = BCExceptionNotFound;
return;
}
}
void CBC_OneDReader::RecordPatternInReverse(CBC_CommonBitArray* row,
int32_t start,
CFX_Int32Array* counters,
int32_t& e) {
int32_t numTransitionsLeft = counters->GetSize();
FX_BOOL last = row->Get(start);
while (start > 0 && numTransitionsLeft >= 0) {
if (row->Get(--start) != last) {
numTransitionsLeft--;
last = !last;
}
}
if (numTransitionsLeft >= 0) {
e = BCExceptionNotFound;
return;
}
RecordPattern(row, start + 1, counters, e);
BC_EXCEPTION_CHECK_ReturnVoid(e);
}
int32_t CBC_OneDReader::PatternMatchVariance(CFX_Int32Array* counters,
const 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) {
#undef max
return FXSYS_IntMax;
}
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) {
#undef max
return FXSYS_IntMax;
}
totalVariance += variance;
}
return totalVariance / total;
}
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