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Fix DownloadedPiecesBar::bitfieldToFloatVector().

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This commit is contained in:
Vladimir Golovnev (Glassez) 2015-10-29 14:45:51 +03:00
parent be78188691
commit f7150edd44
1 changed files with 5 additions and 12 deletions
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17
src/gui/properties/downloadedpiecesbar.cpp
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@ -57,24 +57,17 @@ QVector<float> DownloadedPiecesBar::bitfieldToFloatVector(const QBitArray &vecin
// image.x(1) = pieces.x(1.7 >= x < 3.4)
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
const float fromR = (x * vecin.size()) / (float)reqSize;
const float toR = ((x + 1) * vecin.size()) / (float)reqSize;
const float fromR = x * ratio;
const float toR = (x + 1) * ratio;
// C - integer
int fromC = fromR;// std::floor not needed
int toC = std::ceil(toR);
if (toC > vecin.size())
--toC;
// 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;
// little speed up for really big pieces table, 10K+ size
@ -86,7 +79,7 @@ QVector<float> DownloadedPiecesBar::bitfieldToFloatVector(const QBitArray &vecin
// case when calculated range is (15.2 >= x < 15.7)
if (x2 == toCMinusOne) {
if (vecin[x2]) {
value += toR - fromR;
value += ratio;
}
++x2;
}