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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 2010 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/common/BC_WhiteRectangleDetector.h"
#include <memory>
#include "xfa/fxbarcode/BC_ResultPoint.h"
#include "xfa/fxbarcode/common/BC_CommonBitMatrix.h"
#include "xfa/fxbarcode/utils.h"
CBC_WhiteRectangleDetector::CBC_WhiteRectangleDetector(
CBC_CommonBitMatrix* image) {
m_image = image;
m_height = image->GetHeight();
m_width = image->GetWidth();
m_leftInit = (m_width - INIT_SIZE) >> 1;
m_rightInit = (m_width + INIT_SIZE) >> 1;
m_upInit = (m_height - INIT_SIZE) >> 1;
m_downInit = (m_height + INIT_SIZE) >> 1;
}
void CBC_WhiteRectangleDetector::Init(int32_t& e) {
if (m_upInit < 0 || m_leftInit < 0 || m_downInit >= m_height ||
m_rightInit >= m_width) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnVoid(e);
}
}
CBC_WhiteRectangleDetector::CBC_WhiteRectangleDetector(
CBC_CommonBitMatrix* image,
int32_t initSize,
int32_t x,
int32_t y) {
m_image = image;
m_height = image->GetHeight();
m_width = image->GetWidth();
int32_t halfsize = initSize >> 1;
m_leftInit = x - halfsize;
m_rightInit = x + halfsize;
m_upInit = y - halfsize;
m_downInit = y + halfsize;
}
CBC_WhiteRectangleDetector::~CBC_WhiteRectangleDetector() {}
CFX_PtrArray* CBC_WhiteRectangleDetector::Detect(int32_t& e) {
int32_t left = m_leftInit;
int32_t right = m_rightInit;
int32_t up = m_upInit;
int32_t down = m_downInit;
FX_BOOL sizeExceeded = FALSE;
FX_BOOL aBlackPointFoundOnBorder = TRUE;
FX_BOOL atLeastOneBlackPointFoundOnBorder = FALSE;
while (aBlackPointFoundOnBorder) {
aBlackPointFoundOnBorder = FALSE;
FX_BOOL rightBorderNotWhite = TRUE;
while (rightBorderNotWhite && right < m_width) {
rightBorderNotWhite = ContainsBlackPoint(up, down, right, FALSE);
if (rightBorderNotWhite) {
right++;
aBlackPointFoundOnBorder = TRUE;
}
}
if (right >= m_width) {
sizeExceeded = TRUE;
break;
}
FX_BOOL bottomBorderNotWhite = TRUE;
while (bottomBorderNotWhite && down < m_height) {
bottomBorderNotWhite = ContainsBlackPoint(left, right, down, TRUE);
if (bottomBorderNotWhite) {
down++;
aBlackPointFoundOnBorder = TRUE;
}
}
if (down >= m_height) {
sizeExceeded = TRUE;
break;
}
FX_BOOL leftBorderNotWhite = TRUE;
while (leftBorderNotWhite && left >= 0) {
leftBorderNotWhite = ContainsBlackPoint(up, down, left, FALSE);
if (leftBorderNotWhite) {
left--;
aBlackPointFoundOnBorder = TRUE;
}
}
if (left < 0) {
sizeExceeded = TRUE;
break;
}
FX_BOOL topBorderNotWhite = TRUE;
while (topBorderNotWhite && up >= 0) {
topBorderNotWhite = ContainsBlackPoint(left, right, up, TRUE);
if (topBorderNotWhite) {
up--;
aBlackPointFoundOnBorder = TRUE;
}
}
if (up < 0) {
sizeExceeded = TRUE;
break;
}
if (aBlackPointFoundOnBorder) {
atLeastOneBlackPointFoundOnBorder = TRUE;
}
}
if (!sizeExceeded && atLeastOneBlackPointFoundOnBorder) {
int32_t maxSize = right - left;
std::unique_ptr<CBC_ResultPoint> z;
for (int32_t i = 1; i < maxSize; i++) {
z.reset(GetBlackPointOnSegment((FX_FLOAT)left, (FX_FLOAT)(down - i),
(FX_FLOAT)(left + i), (FX_FLOAT)(down)));
if (z)
break;
}
if (z.get() == NULL) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
std::unique_ptr<CBC_ResultPoint> t;
for (int32_t j = 1; j < maxSize; j++) {
t.reset(GetBlackPointOnSegment((FX_FLOAT)left, (FX_FLOAT)(up + j),
(FX_FLOAT)(left + j), (FX_FLOAT)up));
if (t)
break;
}
if (t.get() == NULL) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
std::unique_ptr<CBC_ResultPoint> x;
for (int32_t k = 1; k < maxSize; k++) {
x.reset(GetBlackPointOnSegment((FX_FLOAT)right, (FX_FLOAT)(up + k),
(FX_FLOAT)(right - k), (FX_FLOAT)up));
if (x)
break;
}
if (x.get() == NULL) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
std::unique_ptr<CBC_ResultPoint> y;
for (int32_t m = 1; m < maxSize; m++) {
y.reset(GetBlackPointOnSegment((FX_FLOAT)right, (FX_FLOAT)(down - m),
(FX_FLOAT)(right - m), (FX_FLOAT)down));
if (y)
break;
}
if (y.get() == NULL) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
return CenterEdges(y.get(), z.get(), x.get(), t.get());
} else {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
return NULL;
}
int32_t CBC_WhiteRectangleDetector::Round(FX_FLOAT d) {
return (int32_t)(d + 0.5f);
}
CBC_ResultPoint* CBC_WhiteRectangleDetector::GetBlackPointOnSegment(
FX_FLOAT aX,
FX_FLOAT aY,
FX_FLOAT bX,
FX_FLOAT bY) {
int32_t dist = DistanceL2(aX, aY, bX, bY);
float xStep = (bX - aX) / dist;
float yStep = (bY - aY) / dist;
for (int32_t i = 0; i < dist; i++) {
int32_t x = Round(aX + i * xStep);
int32_t y = Round(aY + i * yStep);
if (m_image->Get(x, y)) {
return new CBC_ResultPoint((FX_FLOAT)x, (FX_FLOAT)y);
}
}
return NULL;
}
int32_t CBC_WhiteRectangleDetector::DistanceL2(FX_FLOAT aX,
FX_FLOAT aY,
FX_FLOAT bX,
FX_FLOAT bY) {
float xDiff = aX - bX;
float yDiff = aY - bY;
return Round((float)sqrt(xDiff * xDiff + yDiff * yDiff));
}
CFX_PtrArray* CBC_WhiteRectangleDetector::CenterEdges(CBC_ResultPoint* y,
CBC_ResultPoint* z,
CBC_ResultPoint* x,
CBC_ResultPoint* t) {
float yi = y->GetX();
float yj = y->GetY();
float zi = z->GetX();
float zj = z->GetY();
float xi = x->GetX();
float xj = x->GetY();
float ti = t->GetX();
float tj = t->GetY();
if (yi < m_width / 2) {
CFX_PtrArray* result = new CFX_PtrArray;
result->SetSize(4);
(*result)[0] = new CBC_ResultPoint(ti - CORR, tj + CORR);
(*result)[1] = new CBC_ResultPoint(zi + CORR, zj + CORR);
(*result)[2] = new CBC_ResultPoint(xi - CORR, xj - CORR);
(*result)[3] = new CBC_ResultPoint(yi + CORR, yj - CORR);
return result;
} else {
CFX_PtrArray* result = new CFX_PtrArray;
result->SetSize(4);
(*result)[0] = new CBC_ResultPoint(ti + CORR, tj + CORR);
(*result)[1] = new CBC_ResultPoint(zi + CORR, zj - CORR);
(*result)[2] = new CBC_ResultPoint(xi - CORR, xj + CORR);
(*result)[3] = new CBC_ResultPoint(yi - CORR, yj - CORR);
return result;
}
}
FX_BOOL CBC_WhiteRectangleDetector::ContainsBlackPoint(int32_t a,
int32_t b,
int32_t fixed,
FX_BOOL horizontal) {
if (horizontal) {
for (int32_t x = a; x <= b; x++) {
if (m_image->Get(x, fixed)) {
return TRUE;
}
}
} else {
for (int32_t y = a; y <= b; y++) {
if (m_image->Get(fixed, y)) {
return TRUE;
}
}
}
return FALSE;
}
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