[fix] Fixed several warnings and use QElapsedTimer (#150)

* [fix] Fixed several warnings and use QElapsedTimer

* [fix] Now using explicit type for c++98

src/QZXing.cpp

@@ -378,7 +378,7 @@ QRectF getTagRect(const ArrayRef<Ref<ResultPoint> > &resultPoints, const Ref<Bit
 
 QString QZXing::decodeImage(const QImage &image, int maxWidth, int maxHeight, bool smoothTransformation)
 {
-    QTime t;
+    QElapsedTimer t;
     t.start();
     processingTime = -1;
     Ref<Result> res;

src/QZXing.h

@@ -22,6 +22,7 @@
 #include <QObject>
 #include <QImage>
 #include <QVariantList>
+#include <QElapsedTimer>
 
 #include <set>
 

src/zxing/zxing/aztec/decoder/AztecDecoder.cpp

@@ -172,7 +172,7 @@ Ref<DecoderResult> Decoder::decode(Ref<zxing::aztec::AztecDetectorResult> detect
 
   // std::printf("constructing array\n");
   ArrayRef<zxing::byte> arrayOut(aCorrectedBits->getSize());
-  for (int i = 0; i < aCorrectedBits->count(); i++) {
+  for (size_t i = 0; i < aCorrectedBits->count(); i++) {
     arrayOut[i] = (zxing::byte)aCorrectedBits->get(i);
   }
 

src/zxing/zxing/common/GridSampler.cpp

@@ -34,7 +34,7 @@ GridSampler::GridSampler() {
 
 Ref<BitMatrix> GridSampler::sampleGrid(Ref<BitMatrix> image, int dimension, Ref<PerspectiveTransform> transform) {
   Ref<BitMatrix> bits(new BitMatrix(dimension));
-  vector<float> points(dimension << 1, (const float)0.0f);
+  vector<float> points(dimension << 1, 0.0f);
   for (int y = 0; y < dimension; y++) {
     int max = int(points.size());
     float yValue = (float)y + 0.5f;
@@ -55,7 +55,7 @@ Ref<BitMatrix> GridSampler::sampleGrid(Ref<BitMatrix> image, int dimension, Ref<
 
 Ref<BitMatrix> GridSampler::sampleGrid(Ref<BitMatrix> image, int dimensionX, int dimensionY, Ref<PerspectiveTransform> transform) {
   Ref<BitMatrix> bits(new BitMatrix(dimensionX, dimensionY));
-  vector<float> points(dimensionX << 1, (const float)0.0f);
+  vector<float> points(dimensionX << 1, 0.0f);
   for (int y = 0; y < dimensionY; y++) {
     int max = int(points.size());
     float yValue = (float)y + 0.5f;

src/zxing/zxing/common/reedsolomon/GenericGF.cpp

@@ -57,7 +57,7 @@ void GenericGF::initialize() {
   expTable = std::vector<int>(size);
   logTable = std::vector<int>(size);
 
-  int x = 1;
+  size_t x = 1;
 
   for (size_t i = 0; i < size; i++) {
     expTable[i] = x;

src/zxing/zxing/common/reedsolomon/ReedSolomonDecoder.cpp

@@ -138,7 +138,7 @@ ArrayRef<int> ReedSolomonDecoder::findErrorLocations(Ref<GenericGFPoly> errorLoc
   }
   ArrayRef<int> result(new Array<int>(numErrors));
   int e = 0;
-  for (int i = 1; i < field->getSize() && e < numErrors; i++) {
+  for (size_t i = 1; i < field->getSize() && e < numErrors; i++) {
     if (errorLocator->evaluateAt(i) == 0) {
       result[e] = field->inverse(i);
       e++;

src/zxing/zxing/common/reedsolomon/ReedSolomonEncoder.cpp

@@ -51,7 +51,7 @@ void ReedSolomonEncoder::encode(std::vector<zxing::byte> &toEncode, int ecBytes)
     ArrayRef<int> infoCoefficients(dataBytes);
 
     //to-do optimize the following loop
-    for(size_t i=0; i< dataBytes; i++)
+    for(int i=0; i< dataBytes; i++)
         infoCoefficients[i] = toEncode[size_t(i)];
 
     Ref<GenericGFPoly> info(new GenericGFPoly(field_, infoCoefficients));

src/zxing/zxing/qrcode/encoder/QREncoder.cpp

@@ -542,7 +542,7 @@ void Encoder::append8BitBytes(const std::wstring& content, BitArray& bits, const
     QString str = QString::fromStdWString(content);
     QByteArray array = str.toUtf8();
 
-    for (size_t i=0; i<array.size(); i++) {
+    for (int i=0; i<array.size(); i++) {
         bits.appendBits(array.at(i), 8);
     }
 }