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// Copyright 2014 The PDFium Authors
// 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 "fxbarcode/qrcode/BC_QRCoderMaskUtil.h"
#include "core/fxcrt/check.h"
#include "core/fxcrt/notreached.h"
#include "fxbarcode/common/BC_CommonByteMatrix.h"
#include "fxbarcode/qrcode/BC_QRCoder.h"
#include "fxbarcode/qrcode/BC_QRCoderErrorCorrectionLevel.h"
namespace {
int32_t ApplyMaskPenaltyRule1Internal(CBC_CommonByteMatrix* matrix,
bool isHorizontal) {
int32_t penalty = 0;
int32_t numSameBitCells = 0;
int32_t prevBit = -1;
size_t width = matrix->GetWidth();
size_t height = matrix->GetHeight();
size_t iLimit = isHorizontal ? height : width;
size_t jLimit = isHorizontal ? width : height;
pdfium::span<const uint8_t> array = matrix->GetArray();
for (size_t i = 0; i < iLimit; ++i) {
for (size_t j = 0; j < jLimit; ++j) {
int32_t 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;
}
} // namespace
// static
int32_t CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule1(
CBC_CommonByteMatrix* matrix) {
return ApplyMaskPenaltyRule1Internal(matrix, true) +
ApplyMaskPenaltyRule1Internal(matrix, false);
}
// static
int32_t CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule2(
CBC_CommonByteMatrix* matrix) {
int32_t penalty = 0;
pdfium::span<const uint8_t> array = matrix->GetArray();
size_t width = matrix->GetWidth();
size_t height = matrix->GetHeight();
for (size_t y = 0; y + 1 < height; y++) {
for (size_t x = 0; x + 1 < width; x++) {
int32_t 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;
}
// static
int32_t CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule3(
CBC_CommonByteMatrix* matrix) {
int32_t penalty = 0;
pdfium::span<const uint8_t> array = matrix->GetArray();
size_t width = matrix->GetWidth();
size_t height = matrix->GetHeight();
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; ++x) {
if (x == 0 && (y <= 6 || (y + 7 >= height && y + 1 <= height))) {
continue;
}
if (x + 7 == width && y <= 6) {
continue;
}
if (y == 0 && (x <= 6 || (x + 7 >= width && x + 1 <= width))) {
continue;
}
if (y + 7 == height && 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 && 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 && 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;
}
// static
int32_t CBC_QRCoderMaskUtil::ApplyMaskPenaltyRule4(
CBC_CommonByteMatrix* matrix) {
int32_t numDarkCells = 0;
pdfium::span<const uint8_t> array = matrix->GetArray();
size_t width = matrix->GetWidth();
size_t height = matrix->GetHeight();
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; ++x) {
if (array[y * width + x] == 1)
numDarkCells += 1;
}
}
size_t numTotalCells = matrix->GetHeight() * matrix->GetWidth();
double darkRatio = static_cast<double>(numDarkCells) / numTotalCells;
return abs(static_cast<int32_t>(darkRatio * 100 - 50) / 5) * 5 * 10;
}
// static
bool CBC_QRCoderMaskUtil::GetDataMaskBit(int32_t maskPattern,
int32_t x,
int32_t y) {
DCHECK(CBC_QRCoder::IsValidMaskPattern(maskPattern));
int32_t intermediate = 0;
int32_t 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:
NOTREACHED_NORETURN();
}
return intermediate == 0;
}