| // 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 2007 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 "xfa/fxbarcode/qrcode/BC_QRDetector.h" |
| |
| #include <algorithm> |
| #include <memory> |
| |
| #include "xfa/fxbarcode/BC_ResultPoint.h" |
| #include "xfa/fxbarcode/common/BC_CommonBitMatrix.h" |
| #include "xfa/fxbarcode/qrcode/BC_FinderPatternInfo.h" |
| #include "xfa/fxbarcode/qrcode/BC_QRAlignmentPattern.h" |
| #include "xfa/fxbarcode/qrcode/BC_QRAlignmentPatternFinder.h" |
| #include "xfa/fxbarcode/qrcode/BC_QRCoderVersion.h" |
| #include "xfa/fxbarcode/qrcode/BC_QRDetectorResult.h" |
| #include "xfa/fxbarcode/qrcode/BC_QRFinderPattern.h" |
| #include "xfa/fxbarcode/qrcode/BC_QRFinderPatternFinder.h" |
| #include "xfa/fxbarcode/qrcode/BC_QRGridSampler.h" |
| |
| CBC_QRDetector::CBC_QRDetector(CBC_CommonBitMatrix* image) : m_image(image) {} |
| CBC_QRDetector::~CBC_QRDetector() {} |
| CBC_QRDetectorResult* CBC_QRDetector::Detect(int32_t hints, int32_t& e) { |
| CBC_QRFinderPatternFinder finder(m_image); |
| std::unique_ptr<CBC_QRFinderPatternInfo> info(finder.Find(hints, e)); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| CBC_QRDetectorResult* qdr = ProcessFinderPatternInfo(info.get(), e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| return qdr; |
| } |
| CBC_QRDetectorResult* CBC_QRDetector::ProcessFinderPatternInfo( |
| CBC_QRFinderPatternInfo* info, |
| int32_t& e) { |
| std::unique_ptr<CBC_QRFinderPattern> topLeft(info->GetTopLeft()); |
| std::unique_ptr<CBC_QRFinderPattern> topRight(info->GetTopRight()); |
| std::unique_ptr<CBC_QRFinderPattern> bottomLeft(info->GetBottomLeft()); |
| FX_FLOAT moduleSize = |
| CalculateModuleSize(topLeft.get(), topRight.get(), bottomLeft.get()); |
| if (moduleSize < 1.0f) { |
| e = BCExceptionRead; |
| return nullptr; |
| } |
| int32_t dimension = ComputeDimension(topLeft.get(), topRight.get(), |
| bottomLeft.get(), moduleSize, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| CBC_QRCoderVersion* provisionalVersion = |
| CBC_QRCoderVersion::GetProvisionalVersionForDimension(dimension, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| int32_t modulesBetweenFPCenters = |
| provisionalVersion->GetDimensionForVersion() - 7; |
| CBC_QRAlignmentPattern* alignmentPattern = nullptr; |
| if (provisionalVersion->GetAlignmentPatternCenters()->GetSize() > 0) { |
| FX_FLOAT bottomRightX = |
| topRight->GetX() - topLeft->GetX() + bottomLeft->GetX(); |
| FX_FLOAT bottomRightY = |
| topRight->GetY() - topLeft->GetY() + bottomLeft->GetY(); |
| FX_FLOAT correctionToTopLeft = |
| 1.0f - 3.0f / (FX_FLOAT)modulesBetweenFPCenters; |
| FX_FLOAT xtemp = (topLeft->GetX() + |
| correctionToTopLeft * (bottomRightX - topLeft->GetX())); |
| int32_t estAlignmentX = (int32_t)xtemp; |
| FX_FLOAT ytemp = (topLeft->GetY() + |
| correctionToTopLeft * (bottomRightY - topLeft->GetY())); |
| int32_t estAlignmentY = (int32_t)ytemp; |
| for (int32_t i = 4; i <= 16; i <<= 1) { |
| CBC_QRAlignmentPattern* temp = FindAlignmentInRegion( |
| moduleSize, estAlignmentX, estAlignmentY, (FX_FLOAT)i, e); |
| if (temp) { |
| alignmentPattern = temp; |
| break; |
| } |
| } |
| } |
| CBC_CommonBitMatrix* bits = |
| SampleGrid(m_image, topLeft.get(), topRight.get(), bottomLeft.get(), |
| (CBC_ResultPoint*)(alignmentPattern), dimension, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| |
| CFX_ArrayTemplate<CBC_ResultPoint*>* points = |
| new CFX_ArrayTemplate<CBC_ResultPoint*>(); |
| points->Add(bottomLeft.release()); |
| points->Add(topLeft.release()); |
| points->Add(topRight.release()); |
| if (alignmentPattern) |
| points->Add(alignmentPattern); |
| return new CBC_QRDetectorResult(bits, points); |
| } |
| CBC_CommonBitMatrix* CBC_QRDetector::SampleGrid( |
| CBC_CommonBitMatrix* image, |
| CBC_ResultPoint* topLeft, |
| CBC_ResultPoint* topRight, |
| CBC_ResultPoint* bottomLeft, |
| CBC_ResultPoint* alignmentPattern, |
| int32_t dimension, |
| int32_t& e) { |
| FX_FLOAT dimMinusThree = (FX_FLOAT)dimension - 3.5f; |
| FX_FLOAT bottomRightX; |
| FX_FLOAT bottomRightY; |
| FX_FLOAT sourceBottomRightX; |
| FX_FLOAT sourceBottomRightY; |
| if (alignmentPattern) { |
| bottomRightX = alignmentPattern->GetX(); |
| bottomRightY = alignmentPattern->GetY(); |
| sourceBottomRightX = sourceBottomRightY = dimMinusThree - 3.0f; |
| } else { |
| bottomRightX = (topRight->GetX() - topLeft->GetX()) + bottomLeft->GetX(); |
| bottomRightY = (topRight->GetY() - topLeft->GetY()) + bottomLeft->GetY(); |
| sourceBottomRightX = sourceBottomRightY = dimMinusThree; |
| } |
| CBC_QRGridSampler& sampler = CBC_QRGridSampler::GetInstance(); |
| CBC_CommonBitMatrix* cbm = sampler.SampleGrid( |
| image, dimension, dimension, 3.5f, 3.5f, dimMinusThree, 3.5f, |
| sourceBottomRightX, sourceBottomRightY, 3.5f, dimMinusThree, |
| topLeft->GetX(), topLeft->GetY(), topRight->GetX(), topRight->GetY(), |
| bottomRightX, bottomRightY, bottomLeft->GetX(), bottomLeft->GetY(), e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| return cbm; |
| } |
| int32_t CBC_QRDetector::ComputeDimension(CBC_ResultPoint* topLeft, |
| CBC_ResultPoint* topRight, |
| CBC_ResultPoint* bottomLeft, |
| FX_FLOAT moduleSize, |
| int32_t& e) { |
| int32_t tltrCentersDimension = Round( |
| CBC_QRFinderPatternFinder::Distance(topLeft, topRight) / moduleSize); |
| int32_t tlblCentersDimension = Round( |
| CBC_QRFinderPatternFinder::Distance(topLeft, bottomLeft) / moduleSize); |
| int32_t dimension = ((tltrCentersDimension + tlblCentersDimension) >> 1) + 7; |
| switch (dimension & 0x03) { |
| case 0: |
| dimension++; |
| break; |
| case 2: |
| dimension--; |
| break; |
| case 3: { |
| e = BCExceptionRead; |
| BC_EXCEPTION_CHECK_ReturnValue(e, 0); |
| } |
| } |
| return dimension; |
| } |
| FX_FLOAT CBC_QRDetector::CalculateModuleSize(CBC_ResultPoint* topLeft, |
| CBC_ResultPoint* topRight, |
| CBC_ResultPoint* bottomLeft) { |
| return (CalculateModuleSizeOneWay(topLeft, topRight) + |
| CalculateModuleSizeOneWay(topLeft, bottomLeft)) / |
| 2.0f; |
| } |
| FX_FLOAT CBC_QRDetector::CalculateModuleSizeOneWay( |
| CBC_ResultPoint* pattern, |
| CBC_ResultPoint* otherPattern) { |
| FX_FLOAT moduleSizeEst1 = SizeOfBlackWhiteBlackRunBothWays( |
| (int32_t)pattern->GetX(), (int32_t)pattern->GetY(), |
| (int32_t)otherPattern->GetX(), (int32_t)otherPattern->GetY()); |
| FX_FLOAT moduleSizeEst2 = SizeOfBlackWhiteBlackRunBothWays( |
| (int32_t)otherPattern->GetX(), (int32_t)otherPattern->GetY(), |
| (int32_t)pattern->GetX(), (int32_t)pattern->GetY()); |
| if (FXSYS_isnan(moduleSizeEst1)) { |
| return moduleSizeEst2; |
| } |
| if (FXSYS_isnan(moduleSizeEst2)) { |
| return moduleSizeEst1; |
| } |
| return (moduleSizeEst1 + moduleSizeEst2) / 14.0f; |
| } |
| int32_t CBC_QRDetector::Round(FX_FLOAT d) { |
| return (int32_t)(d + 0.5f); |
| } |
| FX_FLOAT CBC_QRDetector::SizeOfBlackWhiteBlackRunBothWays(int32_t fromX, |
| int32_t fromY, |
| int32_t toX, |
| int32_t toY) { |
| FX_FLOAT result = SizeOfBlackWhiteBlackRun(fromX, fromY, toX, toY); |
| int32_t otherToX = fromX - (toX - fromX); |
| if (otherToX < 0) { |
| otherToX = -1; |
| } else if (otherToX >= m_image->GetWidth()) { |
| otherToX = m_image->GetWidth(); |
| } |
| int32_t otherToY = fromY - (toY - fromY); |
| if (otherToY < 0) { |
| otherToY = -1; |
| } else if (otherToY >= m_image->GetHeight()) { |
| otherToY = m_image->GetHeight(); |
| } |
| result += SizeOfBlackWhiteBlackRun(fromX, fromY, otherToX, otherToY); |
| return result - 1.0f; |
| } |
| FX_FLOAT CBC_QRDetector::SizeOfBlackWhiteBlackRun(int32_t fromX, |
| int32_t fromY, |
| int32_t toX, |
| int32_t toY) { |
| FX_BOOL steep = FXSYS_abs(toY - fromY) > FXSYS_abs(toX - fromX); |
| if (steep) { |
| int32_t temp = fromX; |
| fromX = fromY; |
| fromY = temp; |
| temp = toX; |
| toX = toY; |
| toY = temp; |
| } |
| int32_t dx = FXSYS_abs(toX - fromX); |
| int32_t dy = FXSYS_abs(toY - fromY); |
| int32_t error = -dx >> 1; |
| int32_t ystep = fromY < toY ? 1 : -1; |
| int32_t xstep = fromX < toX ? 1 : -1; |
| int32_t state = 0; |
| for (int32_t x = fromX, y = fromY; x != toX; x += xstep) { |
| int32_t realX = steep ? y : x; |
| int32_t realY = steep ? x : y; |
| if (state == 1) { |
| if (m_image->Get(realX, realY)) { |
| state++; |
| } |
| } else { |
| if (!m_image->Get(realX, realY)) { |
| state++; |
| } |
| } |
| if (state == 3) { |
| int32_t diffX = x - fromX; |
| int32_t diffY = y - fromY; |
| return (FX_FLOAT)sqrt((double)(diffX * diffX + diffY * diffY)); |
| } |
| error += dy; |
| if (error > 0) { |
| y += ystep; |
| error -= dx; |
| } |
| } |
| int32_t diffX = toX - fromX; |
| int32_t diffY = toY - fromY; |
| return (FX_FLOAT)sqrt((double)(diffX * diffX + diffY * diffY)); |
| } |
| CBC_QRAlignmentPattern* CBC_QRDetector::FindAlignmentInRegion( |
| FX_FLOAT overallEstModuleSize, |
| int32_t estAlignmentX, |
| int32_t estAlignmentY, |
| FX_FLOAT allowanceFactor, |
| int32_t& e) { |
| int32_t allowance = (int32_t)(allowanceFactor * overallEstModuleSize); |
| int32_t alignmentAreaLeftX = std::max(0, estAlignmentX - allowance); |
| int32_t alignmentAreaRightX = |
| std::min(m_image->GetWidth() - 1, estAlignmentX + allowance); |
| if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize * 3) { |
| e = BCExceptionRead; |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| } |
| int32_t alignmentAreaTopY = std::max(0, estAlignmentY - allowance); |
| int32_t alignmentAreaBottomY = |
| std::min(m_image->GetHeight() - 1, estAlignmentY + allowance); |
| CBC_QRAlignmentPatternFinder alignmentFinder( |
| m_image, alignmentAreaLeftX, alignmentAreaTopY, |
| alignmentAreaRightX - alignmentAreaLeftX, |
| alignmentAreaBottomY - alignmentAreaTopY, overallEstModuleSize); |
| CBC_QRAlignmentPattern* qap = alignmentFinder.Find(e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, nullptr); |
| return qap; |
| } |
