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Fix PieceAvailabilityBar::intToFloatVector(). Closes #3937.

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Vladimir Golovnev (Glassez) 2015-10-28 20:15:25 +03:00
parent c75725e2d8
commit be78188691
1 changed files with 5 additions and 11 deletions
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16
src/gui/properties/pieceavailabilitybar.cpp
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@ -67,23 +67,17 @@ QVector<float> PieceAvailabilityBar::intToFloatVector(const QVector<int> &vecin,
// image.x(1) = pieces.x(1.7 >= x < 3.4) // image.x(1) = pieces.x(1.7 >= x < 3.4)
for (int x = 0; x < reqSize; ++x) { for (int x = 0; x < reqSize; ++x) {
// don't use previously calculated value "ratio" here!!!
// float cannot save irrational number like 7/9, if this number will be rounded up by std::ceil
// give you x2 == pieces.size(), and index out of range: pieces[x2]
// this code is safe, so keep that in mind when you try optimize more.
// tested with size = 3000000ul
// R - real // R - real
const float fromR = (x * vecin.size()) / (float)reqSize; const float fromR = x * ratio;
const float toR = ((x + 1) * vecin.size()) / (float)reqSize; const float toR = (x + 1) * ratio;
// C - integer // C - integer
int fromC = fromR;// std::floor not needed int fromC = fromR;// std::floor not needed
int toC = std::ceil(toR); int toC = std::ceil(toR);
if (toC > vecin.size())
--toC;
// position in pieces table // position in pieces table
// libtorrent::bitfield::m_size is unsigned int(31 bits), so qlonglong is not needed
// tested with size = 3000000ul
int x2 = fromC; int x2 = fromC;
// little speed up for really big pieces table, 10K+ size // little speed up for really big pieces table, 10K+ size
@ -95,7 +89,7 @@ QVector<float> PieceAvailabilityBar::intToFloatVector(const QVector<int> &vecin,
// case when calculated range is (15.2 >= x < 15.7) // case when calculated range is (15.2 >= x < 15.7)
if (x2 == toCMinusOne) { if (x2 == toCMinusOne) {
if (vecin[x2]) if (vecin[x2])
value += (toR - fromR) * vecin[x2]; value += ratio * vecin[x2];
++x2; ++x2;
} }
// case when (15.2 >= x < 17.8) // case when (15.2 >= x < 17.8)