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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 2008 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_CommonByteMatrix.h"
#include "BC_QRCoderErrorCorrectionLevel.h"
#include "BC_QRCoder.h"
#include "BC_QRCoderMaskUtil.h"
CBC_QRCoderMaskUtil::CBC_QRCoderMaskUtil()
{
}
CBC_QRCoderMaskUtil::~CBC_QRCoderMaskUtil()
{
}
FX_INT32 CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule1(CBC_CommonByteMatrix* matrix)
{
return ApplyMaskPenaltyRule1Internal(matrix, TRUE) +
ApplyMaskPenaltyRule1Internal(matrix, FALSE);
}
FX_INT32 CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule2(CBC_CommonByteMatrix* matrix)
{
FX_INT32 penalty = 0;
FX_BYTE* array = matrix->GetArray();
FX_INT32 width = matrix->GetWidth();
FX_INT32 height = matrix->GetHeight();
for(FX_INT32 y = 0; y < height - 1; y++) {
for(FX_INT32 x = 0; x < width - 1; x++) {
FX_INT32 value = array[y * width + x];
if(value == array[y * width + x + 1] &&
value == array[(y + 1) * width + x] &&
value == array[(y + 1) * width + x + 1]) {
penalty ++;
}
}
}
return 3 * penalty;
}
FX_INT32 CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule3(CBC_CommonByteMatrix* matrix)
{
FX_INT32 penalty = 0;
FX_BYTE* array = matrix->GetArray();
FX_INT32 width = matrix->GetWidth();
FX_INT32 height = matrix->GetHeight();
for (FX_INT32 y = 0; y < height; ++y) {
for (FX_INT32 x = 0; x < width; ++x) {
if (x == 0 && ((y >= 0 && y <= 6) || (y >= height - 7 && y <= height - 1))) {
continue;
}
if (x == width - 7 && (y >= 0 && y <= 6)) {
continue;
}
if (y == 0 && ((x >= 0 && x <= 6) || (x >= width - 7 && x <= width - 1))) {
continue;
}
if (y == height - 7 && (x >= 0 && x <= 6)) {
continue;
}
if (x + 6 < width &&
array[y * width + x] == 1 &&
array[y * width + x + 1] == 0 &&
array[y * width + x + 2] == 1 &&
array[y * width + x + 3] == 1 &&
array[y * width + x + 4] == 1 &&
array[y * width + x + 5] == 0 &&
array[y * width + x + 6] == 1 &&
((x + 10 < width &&
array[y * width + x + 7] == 0 &&
array[y * width + x + 8] == 0 &&
array[y * width + x + 9] == 0 &&
array[y * width + x + 10] == 0) ||
(x - 4 >= 0 &&
array[y * width + x - 1] == 0 &&
array[y * width + x - 2] == 0 &&
array[y * width + x - 3] == 0 &&
array[y * width + x - 4] == 0))) {
penalty += 40;
}
if (y + 6 < height &&
array[y * width + x] == 1 &&
array[(y + 1) * width + x] == 0 &&
array[(y + 2) * width + x] == 1 &&
array[(y + 3) * width + x] == 1 &&
array[(y + 4) * width + x] == 1 &&
array[(y + 5) * width + x] == 0 &&
array[(y + 6) * width + x] == 1 &&
((y + 10 < height &&
array[(y + 7) * width + x] == 0 &&
array[(y + 8) * width + x] == 0 &&
array[(y + 9) * width + x] == 0 &&
array[(y + 10) * width + x] == 0) ||
(y - 4 >= 0 &&
array[(y - 1) * width + x] == 0 &&
array[(y - 2) * width + x] == 0 &&
array[(y - 3) * width + x] == 0 &&
array[(y - 4) * width + x] == 0))) {
penalty += 40;
}
}
}
return penalty;
}
FX_INT32 CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule4(CBC_CommonByteMatrix* matrix)
{
FX_INT32 numDarkCells = 0;
FX_BYTE* array = matrix->GetArray();
FX_INT32 width = matrix->GetWidth();
FX_INT32 height = matrix->GetHeight();
for (FX_INT32 y = 0; y < height; ++y) {
for (FX_INT32 x = 0; x < width; ++x) {
if (array[y * width + x] == 1) {
numDarkCells += 1;
}
}
}
FX_INT32 numTotalCells = matrix->GetHeight() * matrix->GetWidth();
double darkRatio = (double) numDarkCells / numTotalCells;
return abs( (FX_INT32) (darkRatio * 100 - 50) / 5 ) * 5 * 10;
}
FX_BOOL CBC_QRCoderMaskUtil::GetDataMaskBit(FX_INT32 maskPattern, FX_INT32 x, FX_INT32 y, FX_INT32 &e)
{
if(!CBC_QRCoder::IsValidMaskPattern(maskPattern)) {
e = (BCExceptionInvalidateMaskPattern);
BC_EXCEPTION_CHECK_ReturnValue(e, FALSE);
}
FX_INT32 intermediate = 0, temp = 0;
switch(maskPattern) {
case 0:
intermediate = (y + x) & 0x1;
break;
case 1:
intermediate = y & 0x1;
break;
case 2:
intermediate = x % 3;
break;
case 3:
intermediate = (y + x) % 3;
break;
case 4:
intermediate = ((y >> 1) + (x / 3)) & 0x1;
break;
case 5:
temp = y * x;
intermediate = (temp & 0x1) + (temp % 3);
break;
case 6:
temp = y * x;
intermediate = (((temp & 0x1) + (temp % 3)) & 0x1);
break;
case 7:
temp = y * x;
intermediate = (((temp % 3) + ((y + x) & 0x1)) & 0x1);
break;
default: {
e = BCExceptionInvalidateMaskPattern;
BC_EXCEPTION_CHECK_ReturnValue(e, FALSE);
}
}
return intermediate == 0;
}
FX_INT32 CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule1Internal(CBC_CommonByteMatrix* matrix, FX_BOOL isHorizontal)
{
FX_INT32 penalty = 0;
FX_INT32 numSameBitCells = 0;
FX_INT32 prevBit = -1;
FX_INT32 width = matrix->GetWidth();
FX_INT32 height = matrix->GetHeight();
FX_INT32 iLimit = isHorizontal ? height : width;
FX_INT32 jLimit = isHorizontal ? width : height;
FX_BYTE* array = matrix->GetArray();
for (FX_INT32 i = 0; i < iLimit; ++i) {
for (FX_INT32 j = 0; j < jLimit; ++j) {
FX_INT32 bit = isHorizontal ? array[i * width + j] : array[j * width + i];
if (bit == prevBit) {
numSameBitCells += 1;
if (numSameBitCells == 5) {
penalty += 3;
} else if (numSameBitCells > 5) {
penalty += 1;
}
} else {
numSameBitCells = 1;
prevBit = bit;
}
}
numSameBitCells = 0;
}
return penalty;
}
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