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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 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;
}
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