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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 "../BC_ResultPoint.h"
#include "../common/BC_CommonBitMatrix.h"
#include "BC_QRAlignmentPattern.h"
#include "BC_QRAlignmentPatternFinder.h"
CBC_QRAlignmentPatternFinder::CBC_QRAlignmentPatternFinder(
CBC_CommonBitMatrix* image,
int32_t startX,
int32_t startY,
int32_t width,
int32_t height,
FX_FLOAT moduleSize)
: m_image(image),
m_startX(startX),
m_startY(startY),
m_width(width),
m_height(height),
m_moduleSize(moduleSize)
{
m_crossCheckStateCount.SetSize(3);
}
CBC_QRAlignmentPatternFinder::~CBC_QRAlignmentPatternFinder() {
for (int32_t i = 0; i < m_possibleCenters.GetSize(); i++) {
delete (CBC_QRAlignmentPattern*)m_possibleCenters[i];
}
m_possibleCenters.RemoveAll();
}
CBC_QRAlignmentPattern* CBC_QRAlignmentPatternFinder::Find(int32_t& e) {
int32_t startX = m_startX;
int32_t height = m_height;
int32_t maxJ = startX + m_width;
int32_t middleI = m_startY + (height >> 1);
CFX_Int32Array stateCount;
stateCount.SetSize(3);
for (int32_t iGen = 0; iGen < height; iGen++) {
int32_t i =
middleI + ((iGen & 0x01) == 0 ? ((iGen + 1) >> 1) : -((iGen + 1) >> 1));
stateCount[0] = 0;
stateCount[1] = 0;
stateCount[2] = 0;
int32_t j = startX;
while (j < maxJ && !m_image->Get(j, i)) {
j++;
}
int32_t currentState = 0;
while (j < maxJ) {
if (m_image->Get(j, i)) {
if (currentState == 1) {
stateCount[currentState]++;
} else {
if (currentState == 2) {
if (FoundPatternCross(stateCount)) {
CBC_QRAlignmentPattern* confirmed =
HandlePossibleCenter(stateCount, i, j);
if (confirmed != NULL) {
return confirmed;
}
}
stateCount[0] = stateCount[2];
stateCount[1] = 1;
stateCount[2] = 0;
currentState = 1;
} else {
stateCount[++currentState]++;
}
}
} else {
if (currentState == 1) {
currentState++;
}
stateCount[currentState]++;
}
j++;
}
if (FoundPatternCross(stateCount)) {
CBC_QRAlignmentPattern* confirmed =
HandlePossibleCenter(stateCount, i, maxJ);
if (confirmed != NULL) {
return confirmed;
}
}
}
if (m_possibleCenters.GetSize() != 0) {
return ((CBC_QRAlignmentPattern*)(m_possibleCenters[0]))->Clone();
}
e = BCExceptionRead;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return NULL;
}
FX_FLOAT CBC_QRAlignmentPatternFinder::CenterFromEnd(
const CFX_Int32Array& stateCount,
int32_t end) {
return (FX_FLOAT)(end - stateCount[2]) - stateCount[1] / 2.0f;
}
FX_BOOL CBC_QRAlignmentPatternFinder::FoundPatternCross(
const CFX_Int32Array& stateCount) {
FX_FLOAT moduleSize = m_moduleSize;
FX_FLOAT maxVariance = moduleSize / 2.0f;
for (int32_t i = 0; i < 3; i++) {
if (fabs(moduleSize - stateCount[i]) >= maxVariance) {
return false;
}
}
return TRUE;
}
FX_FLOAT CBC_QRAlignmentPatternFinder::CrossCheckVertical(
int32_t startI,
int32_t centerJ,
int32_t maxCount,
int32_t originalStateCountTotal) {
CBC_CommonBitMatrix* image = m_image;
int32_t maxI = m_image->GetHeight();
CFX_Int32Array stateCount;
stateCount.Copy(m_crossCheckStateCount);
stateCount[0] = 0;
stateCount[1] = 0;
stateCount[2] = 0;
int32_t i = startI;
while (i >= 0 && m_image->Get(centerJ, i) && stateCount[1] <= maxCount) {
stateCount[1]++;
i--;
}
if (i < 0 || stateCount[1] > maxCount) {
return FXSYS_nan();
}
while (i >= 0 && !m_image->Get(centerJ, i) && stateCount[0] <= maxCount) {
stateCount[0]++;
i--;
}
if (stateCount[0] > maxCount) {
return FXSYS_nan();
}
i = startI + 1;
while (i < maxI && m_image->Get(centerJ, i) && stateCount[1] <= maxCount) {
stateCount[1]++;
i++;
}
if (i == maxI || stateCount[1] > maxCount) {
return FXSYS_nan();
}
while (i < maxI && !m_image->Get(centerJ, i) && stateCount[2] <= maxCount) {
stateCount[2]++;
i++;
}
if (stateCount[2] > maxCount) {
return FXSYS_nan();
}
int32_t stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
if (5 * abs(stateCountTotal - originalStateCountTotal) >=
originalStateCountTotal) {
return FXSYS_nan();
}
return FoundPatternCross(stateCount) ? CenterFromEnd(stateCount, i)
: FXSYS_nan();
}
CBC_QRAlignmentPattern* CBC_QRAlignmentPatternFinder::HandlePossibleCenter(
const CFX_Int32Array& stateCount,
int32_t i,
int32_t j) {
int32_t stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
FX_FLOAT centerJ = CenterFromEnd(stateCount, j);
FX_FLOAT centerI = CrossCheckVertical(i, (int32_t)centerJ, 2 * stateCount[1],
stateCountTotal);
if (!FXSYS_isnan(centerI)) {
FX_FLOAT estimatedModuleSize =
(FX_FLOAT)(stateCount[0] + stateCount[1] + stateCount[2]) / 3.0f;
int32_t max = m_possibleCenters.GetSize();
for (int32_t index = 0; index < max; index++) {
CBC_QRAlignmentPattern* center =
(CBC_QRAlignmentPattern*)(m_possibleCenters[index]);
if (center->AboutEquals(estimatedModuleSize, centerI, centerJ)) {
return FX_NEW CBC_QRAlignmentPattern(centerJ, centerI,
estimatedModuleSize);
}
}
m_possibleCenters.Add(
FX_NEW CBC_QRAlignmentPattern(centerJ, centerI, estimatedModuleSize));
}
return NULL;
}
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