diff options
Diffstat (limited to 'xfa/fxbarcode/oned/BC_OneDReader.cpp')
| -rw-r--r-- | xfa/fxbarcode/oned/BC_OneDReader.cpp | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/xfa/fxbarcode/oned/BC_OneDReader.cpp b/xfa/fxbarcode/oned/BC_OneDReader.cpp new file mode 100644 index 0000000000..c66ec0bebd --- /dev/null +++ b/xfa/fxbarcode/oned/BC_OneDReader.cpp @@ -0,0 +1,175 @@ +// 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 <memory> + +#include "xfa/fxbarcode/BC_BinaryBitmap.h" +#include "xfa/fxbarcode/BC_Reader.h" +#include "xfa/fxbarcode/common/BC_CommonBitArray.h" +#include "xfa/fxbarcode/oned/BC_OneDReader.h" +#include "xfa/fxbarcode/utils.h" + +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(); + 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; + const bool isAbove = (x & 0x01) == 0; + int32_t rowNumber = + middle + + rowStep * (isAbove ? rowStepsAboveOrBelow : -rowStepsAboveOrBelow); + if (rowNumber < 0 || rowNumber >= height) { + break; + } + std::unique_ptr<CBC_CommonBitArray> row( + image->GetBlackRow(rowNumber, nullptr, e)); + if (e != BCExceptionNO) { + e = BCExceptionNO; + continue; + } + for (int32_t attempt = 0; attempt < 2; attempt++) { + if (attempt == 1) { + row->Reverse(); + } + CFX_ByteString result = DecodeRow(rowNumber, row.get(), hints, e); + if (e != BCExceptionNO) { + e = BCExceptionNO; + continue; + } + return result; + } + } + 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; +} |