diff options
Diffstat (limited to 'xfa/src/fxbarcode/qrcode/BC_QRAlignmentPatternFinder.cpp')
| -rw-r--r-- | xfa/src/fxbarcode/qrcode/BC_QRAlignmentPatternFinder.cpp | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/xfa/src/fxbarcode/qrcode/BC_QRAlignmentPatternFinder.cpp b/xfa/src/fxbarcode/qrcode/BC_QRAlignmentPatternFinder.cpp new file mode 100644 index 0000000000..669a0fbf7e --- /dev/null +++ b/xfa/src/fxbarcode/qrcode/BC_QRAlignmentPatternFinder.cpp @@ -0,0 +1,187 @@ +// 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,
+ FX_INT32 startX,
+ FX_INT32 startY,
+ FX_INT32 width,
+ FX_INT32 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 (FX_INT32 i = 0; i < m_possibleCenters.GetSize(); i++) {
+ delete (CBC_QRAlignmentPattern*)m_possibleCenters[i];
+ }
+ m_possibleCenters.RemoveAll();
+}
+CBC_QRAlignmentPattern *CBC_QRAlignmentPatternFinder::Find(FX_INT32 &e)
+{
+ FX_INT32 startX = m_startX;
+ FX_INT32 height = m_height;
+ FX_INT32 maxJ = startX + m_width;
+ FX_INT32 middleI = m_startY + (height >> 1);
+ CFX_Int32Array stateCount;
+ stateCount.SetSize(3);
+ for (FX_INT32 iGen = 0; iGen < height; iGen++) {
+ FX_INT32 i = middleI + ((iGen & 0x01) == 0 ? ((iGen + 1) >> 1) : -((iGen + 1) >> 1));
+ stateCount[0] = 0;
+ stateCount[1] = 0;
+ stateCount[2] = 0;
+ FX_INT32 j = startX;
+ while (j < maxJ && !m_image->Get(j, i)) {
+ j++;
+ }
+ FX_INT32 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, FX_INT32 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 (FX_INT32 i = 0; i < 3; i++) {
+ if (fabs(moduleSize - stateCount[i]) >= maxVariance) {
+ return false;
+ }
+ }
+ return TRUE;
+}
+FX_FLOAT CBC_QRAlignmentPatternFinder::CrossCheckVertical(FX_INT32 startI, FX_INT32 centerJ, FX_INT32 maxCount, FX_INT32 originalStateCountTotal)
+{
+ CBC_CommonBitMatrix *image = m_image;
+ FX_INT32 maxI = m_image->GetHeight();
+ CFX_Int32Array stateCount;
+ stateCount.Copy(m_crossCheckStateCount);
+ stateCount[0] = 0;
+ stateCount[1] = 0;
+ stateCount[2] = 0;
+ FX_INT32 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();
+ }
+ FX_INT32 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, FX_INT32 i, FX_INT32 j)
+{
+ FX_INT32 stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
+ FX_FLOAT centerJ = CenterFromEnd(stateCount, j);
+ FX_FLOAT centerI = CrossCheckVertical(i, (FX_INT32) centerJ, 2 * stateCount[1], stateCountTotal);
+ if (!FXSYS_isnan(centerI)) {
+ FX_FLOAT estimatedModuleSize = (FX_FLOAT) (stateCount[0] + stateCount[1] + stateCount[2]) / 3.0f;
+ FX_INT32 max = m_possibleCenters.GetSize();
+ for (FX_INT32 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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