// 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 "../barcode.h" #include "../common/BC_CommonBitMatrix.h" #include "../BC_ResultPoint.h" #include "BC_QRFinderPattern.h" #include "BC_QRCoderVersion.h" #include "BC_FinderPatternInfo.h" #include "BC_QRGridSampler.h" #include "BC_QRAlignmentPatternFinder.h" #include "BC_QRFinderPatternFinder.h" #include "BC_QRDetectorResult.h" #include "BC_QRDetector.h" CBC_QRDetector::CBC_QRDetector(CBC_CommonBitMatrix *image): m_image(image) { } CBC_QRDetector::~CBC_QRDetector() { } CBC_QRDetectorResult *CBC_QRDetector::Detect(FX_INT32 hints, FX_INT32 &e) { CBC_QRFinderPatternFinder finder(m_image); CBC_QRFinderPatternInfo* qpi = finder.Find(hints, e); BC_EXCEPTION_CHECK_ReturnValue(e, NULL); CBC_AutoPtr<CBC_QRFinderPatternInfo> info(qpi); CBC_QRDetectorResult* qdr = ProcessFinderPatternInfo(info.get(), e); BC_EXCEPTION_CHECK_ReturnValue(e, NULL); return qdr; } CBC_QRDetectorResult* CBC_QRDetector::ProcessFinderPatternInfo(CBC_QRFinderPatternInfo *info, FX_INT32 &e) { CBC_AutoPtr<CBC_QRFinderPattern> topLeft(info->GetTopLeft()); CBC_AutoPtr<CBC_QRFinderPattern> topRight(info->GetTopRight()); CBC_AutoPtr<CBC_QRFinderPattern> bottomLeft(info->GetBottomLeft()); FX_FLOAT moduleSize = CalculateModuleSize(topLeft.get(), topRight.get(), bottomLeft.get()); if(moduleSize < 1.0f) { e = BCExceptionRead; BC_EXCEPTION_CHECK_ReturnValue(e, NULL); } FX_INT32 dimension = ComputeDimension(topLeft.get(), topRight.get(), bottomLeft.get(), moduleSize, e); BC_EXCEPTION_CHECK_ReturnValue(e, NULL); CBC_QRCoderVersion *provisionalVersion = CBC_QRCoderVersion::GetProvisionalVersionForDimension(dimension, e); BC_EXCEPTION_CHECK_ReturnValue(e, NULL); FX_INT32 modulesBetweenFPCenters = provisionalVersion->GetDimensionForVersion() - 7; CBC_QRAlignmentPattern * alignmentPattern = NULL; 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())); FX_INT32 estAlignmentX = (FX_INT32)xtemp ; FX_FLOAT ytemp = (topLeft->GetY() + correctionToTopLeft * (bottomRightY - topLeft->GetY())); FX_INT32 estAlignmentY = (FX_INT32)ytemp; for(FX_INT32 i = 4; i <= 16; i <<= 1) { CBC_QRAlignmentPattern *temp = FindAlignmentInRegion(moduleSize, estAlignmentX, estAlignmentY, (FX_FLOAT) i, e); 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, NULL); CFX_PtrArray *points = FX_NEW CFX_PtrArray; if(alignmentPattern == NULL) { points->Add(bottomLeft.release()); points->Add(topLeft.release()); points->Add(topRight.release()); } else { points->Add(bottomLeft.release()); points->Add(topLeft.release()); points->Add(topRight.release()); points->Add(alignmentPattern); } return FX_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, FX_INT32 dimension, FX_INT32 &e) { FX_FLOAT dimMinusThree = (FX_FLOAT) dimension - 3.5f; FX_FLOAT bottomRightX; FX_FLOAT bottomRightY; FX_FLOAT sourceBottomRightX; FX_FLOAT sourceBottomRightY; if (alignmentPattern != NULL) { 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, NULL); return cbm; } FX_INT32 CBC_QRDetector::ComputeDimension(CBC_ResultPoint *topLeft, CBC_ResultPoint *topRight, CBC_ResultPoint *bottomLeft, FX_FLOAT moduleSize, FX_INT32 &e) { FX_INT32 tltrCentersDimension = Round(CBC_QRFinderPatternFinder::Distance(topLeft, topRight) / moduleSize); FX_INT32 tlblCentersDimension = Round(CBC_QRFinderPatternFinder::Distance(topLeft, bottomLeft) / moduleSize); FX_INT32 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((FX_INT32) pattern->GetX(), (FX_INT32) pattern->GetY(), (FX_INT32) otherPattern->GetX(), (FX_INT32) otherPattern->GetY()); FX_FLOAT moduleSizeEst2 = SizeOfBlackWhiteBlackRunBothWays((FX_INT32) otherPattern->GetX(), (FX_INT32) otherPattern->GetY(), (FX_INT32) pattern->GetX(), (FX_INT32) pattern->GetY()); if (FXSYS_isnan(moduleSizeEst1)) { return moduleSizeEst2; } if (FXSYS_isnan(moduleSizeEst2)) { return moduleSizeEst1; } return (moduleSizeEst1 + moduleSizeEst2) / 14.0f; } FX_INT32 CBC_QRDetector::Round(FX_FLOAT d) { return (FX_INT32)(d + 0.5f); } FX_FLOAT CBC_QRDetector::SizeOfBlackWhiteBlackRunBothWays(FX_INT32 fromX, FX_INT32 fromY, FX_INT32 toX, FX_INT32 toY) { FX_FLOAT result = SizeOfBlackWhiteBlackRun(fromX, fromY, toX, toY); FX_INT32 otherToX = fromX - (toX - fromX); if (otherToX < 0) { otherToX = -1; } else if (otherToX >= m_image->GetWidth()) { otherToX = m_image->GetWidth(); } FX_INT32 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(FX_INT32 fromX, FX_INT32 fromY, FX_INT32 toX, FX_INT32 toY) { FX_BOOL steep = FXSYS_abs(toY - fromY) > FXSYS_abs(toX - fromX); if (steep) { FX_INT32 temp = fromX; fromX = fromY; fromY = temp; temp = toX; toX = toY; toY = temp; } FX_INT32 dx = FXSYS_abs(toX - fromX); FX_INT32 dy = FXSYS_abs(toY - fromY); FX_INT32 error = -dx >> 1; FX_INT32 ystep = fromY < toY ? 1 : -1; FX_INT32 xstep = fromX < toX ? 1 : -1; FX_INT32 state = 0; for (FX_INT32 x = fromX, y = fromY; x != toX; x += xstep) { FX_INT32 realX = steep ? y : x; FX_INT32 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) { FX_INT32 diffX = x - fromX; FX_INT32 diffY = y - fromY; return (FX_FLOAT) sqrt((double) (diffX * diffX + diffY * diffY)); } error += dy; if (error > 0) { y += ystep; error -= dx; } } FX_INT32 diffX = toX - fromX; FX_INT32 diffY = toY - fromY; return (FX_FLOAT) sqrt((double) (diffX * diffX + diffY * diffY)); } CBC_QRAlignmentPattern *CBC_QRDetector::FindAlignmentInRegion(FX_FLOAT overallEstModuleSize, FX_INT32 estAlignmentX, FX_INT32 estAlignmentY, FX_FLOAT allowanceFactor, FX_INT32 &e) { FX_INT32 allowance = (FX_INT32) (allowanceFactor * overallEstModuleSize); FX_INT32 alignmentAreaLeftX = FX_MAX(0, estAlignmentX - allowance); FX_INT32 alignmentAreaRightX = FX_MIN(m_image->GetWidth() - 1, estAlignmentX + allowance); if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize * 3) { e = BCExceptionRead; BC_EXCEPTION_CHECK_ReturnValue(e, NULL); } FX_INT32 alignmentAreaTopY = FX_MAX(0, estAlignmentY - allowance); FX_INT32 alignmentAreaBottomY = FX_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, NULL); return qap; }