Organize barcode codes into modules.

xfa/src/fxbarcode/src/BC_GlobalHistogramBinarizer.cpp

-// 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 2009 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 "include/BC_Binarizer.h"
-#include "include/BC_LuminanceSource.h"
-#include "include/BC_CommonBitMatrix.h"
-#include "include/BC_CommonBitArray.h"
-#include "include/BC_GlobalHistogramBinarizer.h"
-const FX_INT32 LUMINANCE_BITS = 5;
-const FX_INT32 LUMINANCE_SHIFT = 8 - LUMINANCE_BITS;
-const FX_INT32 LUMINANCE_BUCKETS = 1 << LUMINANCE_BITS;
-CBC_GlobalHistogramBinarizer::CBC_GlobalHistogramBinarizer(CBC_LuminanceSource *source): CBC_Binarizer(source)
-{
-}
-CBC_GlobalHistogramBinarizer::~CBC_GlobalHistogramBinarizer()
-{
-}
-CBC_CommonBitArray *CBC_GlobalHistogramBinarizer::GetBlackRow(FX_INT32 y, CBC_CommonBitArray *row, FX_INT32 &e)
-{
-    CBC_LuminanceSource *source = GetLuminanceSource();
-    FX_INT32 width = source->GetWidth();
-    CBC_AutoPtr<CBC_CommonBitArray> result(FX_NEW CBC_CommonBitArray(width));
-    InitArrays(width);
-    CFX_ByteArray *localLuminances = source->GetRow(y, m_luminance, e);
-    if (e != BCExceptionNO) {
-        return result.release();
-    }
-    CFX_Int32Array localBuckets;
-    localBuckets.Copy(m_buckets);
-    FX_INT32 x;
-    for (x = 0; x < width; x++) {
-        FX_INT32 pixel = (*localLuminances)[x] & 0xff;
-        localBuckets[pixel >> LUMINANCE_SHIFT]++;
-    }
-    FX_INT32 blackPoint = EstimateBlackPoint(localBuckets, e);
-    if (e != BCExceptionNO) {
-        return result.release();
-    }
-    FX_INT32 left = (*localLuminances)[0] & 0xff;
-    FX_INT32 center = (*localLuminances)[1] & 0xff;
-    for (x = 1; x < width - 1; x++) {
-        FX_INT32 right = (*localLuminances)[x + 1] & 0xff;
-        FX_INT32 luminance = ((center << 2) - left - right) >> 1;
-        if (luminance < blackPoint) {
-            result->Set(x);
-        }
-        left = center;
-        center = right;
-    }
-    return  result.release();
-}
-CBC_CommonBitMatrix *CBC_GlobalHistogramBinarizer::GetBlackMatrix(FX_INT32 &e)
-{
-    CBC_LuminanceSource *source = GetLuminanceSource();
-    FX_INT32 width = source->GetWidth();
-    FX_INT32 height = source->GetHeight();
-    CBC_CommonBitMatrix *BitMatrixTemp = FX_NEW CBC_CommonBitMatrix();
-    BitMatrixTemp->Init(width, height);
-    CBC_AutoPtr<CBC_CommonBitMatrix> matrix(BitMatrixTemp);
-    InitArrays(width);
-    CFX_Int32Array localBuckets;
-    localBuckets.Copy(m_buckets);
-    FX_INT32 y;
-    for (y = 1; y < 5; y++) {
-        FX_INT32 row = height * y / 5;
-        CFX_ByteArray *localLuminances = source->GetRow(row, m_luminance, e);
-        BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
-        FX_INT32 right = (width << 2) / 5;
-        FX_INT32 x;
-        for (x = width / 5; x < right; x++) {
-            FX_INT32 pixel = (*localLuminances)[x] & 0xff;
-            localBuckets[pixel >> LUMINANCE_SHIFT]++;
-        }
-    }
-    FX_INT32 blackPoint = EstimateBlackPoint(localBuckets, e);
-    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
-    CBC_AutoPtr<CFX_ByteArray> localLuminances(source->GetMatrix());
-    for (y = 0; y < height; y++) {
-        FX_INT32 offset = y * width;
-        for (FX_INT32 x = 0; x < width; x++) {
-            FX_INT32 pixel = (*localLuminances)[offset + x] & 0xff;
-            if (pixel < blackPoint) {
-                matrix->Set(x, y);
-            }
-        }
-    }
-    return matrix.release();
-}
-void CBC_GlobalHistogramBinarizer::InitArrays(FX_INT32 luminanceSize)
-{
-    if(m_luminance.GetSize() < luminanceSize) {
-        m_luminance.SetSize(luminanceSize);
-    }
-    if(m_buckets.GetSize() <= 0) {
-        m_buckets.SetSize(LUMINANCE_BUCKETS);
-    } else {
-        FX_INT32 x;
-        for(x = 0; x < LUMINANCE_BUCKETS; x++) {
-            m_buckets[x] = 0;
-        }
-    }
-}
-FX_INT32 CBC_GlobalHistogramBinarizer::EstimateBlackPoint(CFX_Int32Array &buckets, FX_INT32 &e)
-{
-    FX_INT32 numBuckets = buckets.GetSize();
-    FX_INT32 maxBucketCount = 0;
-    FX_INT32 firstPeak = 0;
-    FX_INT32 firstPeakSize = 0;
-    FX_INT32 x;
-    for (x = 0; x < numBuckets; x++) {
-        if (buckets[x] > firstPeakSize) {
-            firstPeak = x;
-            firstPeakSize = buckets[x];
-        }
-        if (buckets[x] > maxBucketCount) {
-            maxBucketCount = buckets[x];
-        }
-    }
-    FX_INT32 secondPeak = 0;
-    FX_INT32 secondPeakScore = 0;
-    for (x = 0; x < numBuckets; x++) {
-        FX_INT32 distanceToBiggest = x - firstPeak;
-        FX_INT32 score = buckets[x] * distanceToBiggest * distanceToBiggest;
-        if (score > secondPeakScore) {
-            secondPeak = x;
-            secondPeakScore = score;
-        }
-    }
-    if (firstPeak > secondPeak) {
-        FX_INT32 temp = firstPeak;
-        firstPeak = secondPeak;
-        secondPeak = temp;
-    }
-    if (secondPeak - firstPeak <= numBuckets >> 4) {
-        e = BCExceptionRead;
-        return 0;
-    }
-    FX_INT32 bestValley = secondPeak - 1;
-    FX_INT32 bestValleyScore = -1;
-    for (x = secondPeak - 1; x > firstPeak; x--) {
-        FX_INT32 fromFirst = x - firstPeak;
-        FX_INT32 score = fromFirst * fromFirst * (secondPeak - x) * (maxBucketCount - buckets[x]);
-        if (score > bestValleyScore) {
-            bestValley = x;
-            bestValleyScore = score;
-        }
-    }
-    return bestValley << LUMINANCE_SHIFT;
-}