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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
#include "barcode.h"
#include "include/BC_WhiteRectangleDetector.h"
#include "include/BC_CommonBitMatrix.h"
#include "include/BC_ResultPoint.h"
const FX_INT32 CBC_WhiteRectangleDetector::INIT_SIZE = 30;
const FX_INT32 CBC_WhiteRectangleDetector::CORR = 1;
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(FX_INT32 &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, FX_INT32 initSize, FX_INT32 x, FX_INT32 y)
{
m_image = image;
m_height = image->GetHeight();
m_width = image->GetWidth();
FX_INT32 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(FX_INT32 &e)
{
FX_INT32 left = m_leftInit;
FX_INT32 right = m_rightInit;
FX_INT32 up = m_upInit;
FX_INT32 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) {
FX_INT32 maxSize = right - left;
CBC_AutoPtr<CBC_ResultPoint> z(NULL);
for (FX_INT32 i = 1; i < maxSize; i++) {
z = CBC_AutoPtr<CBC_ResultPoint>(GetBlackPointOnSegment((FX_FLOAT)left, (FX_FLOAT)(down - i), (FX_FLOAT)(left + i), (FX_FLOAT)(down)) );
if (z.get() != NULL) {
break;
}
}
if (z.get() == NULL) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
CBC_AutoPtr<CBC_ResultPoint> t(NULL);
for (FX_INT32 j = 1; j < maxSize; j++) {
t = CBC_AutoPtr<CBC_ResultPoint>(GetBlackPointOnSegment((FX_FLOAT)left, (FX_FLOAT)(up + j), (FX_FLOAT)(left + j), (FX_FLOAT)up));
if (t.get() != NULL) {
break;
}
}
if (t.get() == NULL) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
CBC_AutoPtr<CBC_ResultPoint> x(NULL);
for (FX_INT32 k = 1; k < maxSize; k++) {
x = CBC_AutoPtr<CBC_ResultPoint>(GetBlackPointOnSegment((FX_FLOAT)right, (FX_FLOAT)(up + k), (FX_FLOAT)(right - k), (FX_FLOAT)up));
if (x.get() != NULL) {
break;
}
}
if (x.get() == NULL) {
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
CBC_AutoPtr<CBC_ResultPoint> y(NULL);
for (FX_INT32 m = 1; m < maxSize; m++) {
y = CBC_AutoPtr<CBC_ResultPoint>(GetBlackPointOnSegment((FX_FLOAT)right, (FX_FLOAT)(down - m), (FX_FLOAT)(right - m), (FX_FLOAT) down));
if (y.get() != NULL) {
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;
}
FX_INT32 CBC_WhiteRectangleDetector::Round(FX_FLOAT d)
{
return (FX_INT32) (d + 0.5f);
}
CBC_ResultPoint *CBC_WhiteRectangleDetector::GetBlackPointOnSegment(FX_FLOAT aX, FX_FLOAT aY, FX_FLOAT bX, FX_FLOAT bY)
{
FX_INT32 dist = DistanceL2(aX, aY, bX, bY);
float xStep = (bX - aX) / dist;
float yStep = (bY - aY) / dist;
for (FX_INT32 i = 0; i < dist; i++) {
FX_INT32 x = Round(aX + i * xStep);
FX_INT32 y = Round(aY + i * yStep);
if (m_image->Get(x, y)) {
return FX_NEW CBC_ResultPoint((FX_FLOAT)x, (FX_FLOAT) y);
}
}
return NULL;
}
FX_INT32 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 = FX_NEW CFX_PtrArray;
result->SetSize(4);
(*result)[0] = FX_NEW CBC_ResultPoint(ti - CORR, tj + CORR);
(*result)[1] = FX_NEW CBC_ResultPoint(zi + CORR, zj + CORR);
(*result)[2] = FX_NEW CBC_ResultPoint(xi - CORR, xj - CORR);
(*result)[3] = FX_NEW CBC_ResultPoint(yi + CORR, yj - CORR);
return result;
} else {
CFX_PtrArray *result = FX_NEW CFX_PtrArray;
result->SetSize(4);
(*result)[0] = FX_NEW CBC_ResultPoint(ti + CORR, tj + CORR);
(*result)[1] = FX_NEW CBC_ResultPoint(zi + CORR, zj - CORR);
(*result)[2] = FX_NEW CBC_ResultPoint(xi - CORR, xj + CORR);
(*result)[3] = FX_NEW CBC_ResultPoint(yi - CORR, yj - CORR);
return result;
}
}
FX_BOOL CBC_WhiteRectangleDetector::ContainsBlackPoint(FX_INT32 a, FX_INT32 b, FX_INT32 fixed, FX_BOOL horizontal)
{
if (horizontal) {
for (FX_INT32 x = a; x <= b; x++) {
if (m_image->Get(x, fixed)) {
return TRUE;
}
}
} else {
for (FX_INT32 y = a; y <= b; y++) {
if (m_image->Get(fixed, y)) {
return TRUE;
}
}
}
return FALSE;
}
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