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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_Reader.h"
#include "include/BC_OneDReader.h"
#include "include/BC_BinaryBitmap.h"
#include "include/BC_CommonBitArray.h"
const FX_INT32 CBC_OneDReader::INTEGER_MATH_SHIFT = 8;
const FX_INT32 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, FX_INT32 &e)
{
CFX_ByteString strtemp = Decode(image, 0, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
return strtemp;
}
CFX_ByteString CBC_OneDReader::Decode(CBC_BinaryBitmap *image, FX_INT32 hints, FX_INT32 &e)
{
CFX_ByteString strtemp = DeDecode(image, hints, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
return strtemp;
}
CFX_ByteString CBC_OneDReader::DeDecode(CBC_BinaryBitmap *image, FX_INT32 hints, FX_INT32 &e)
{
FX_INT32 width = image->GetWidth();
FX_INT32 height = image->GetHeight();
CBC_CommonBitArray *row = NULL;
FX_INT32 middle = height >> 1;
FX_BOOL tryHarder = FALSE;
FX_INT32 rowStep = FX_MAX(1, height >> (tryHarder ? 8 : 5));
FX_INT32 maxLines;
if (tryHarder) {
maxLines = height;
} else {
maxLines = 15;
}
for (FX_INT32 x = 0; x < maxLines; x++) {
FX_INT32 rowStepsAboveOrBelow = (x + 1) >> 1;
FX_BOOL isAbove = (x & 0x01) == 0;
FX_INT32 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 (FX_INT32 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, FX_INT32 start, CFX_Int32Array *counters, FX_INT32 &e)
{
FX_INT32 numCounters = counters->GetSize();
for (FX_INT32 i = 0; i < numCounters; i++) {
(*counters)[i] = 0;
}
FX_INT32 end = row->GetSize();
if (start >= end) {
e = BCExceptionNotFound;
return;
}
FX_BOOL isWhite = !row->Get(start);
FX_INT32 counterPosition = 0;
FX_INT32 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, FX_INT32 start, CFX_Int32Array *counters, FX_INT32 &e)
{
FX_INT32 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);
}
FX_INT32 CBC_OneDReader::PatternMatchVariance(CFX_Int32Array *counters, const 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) {
#undef max
return FXSYS_IntMax;
}
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) {
#undef max
return FXSYS_IntMax;
}
totalVariance += variance;
}
return totalVariance / total;
}
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