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This commit is contained in:
Kovid Goyal 2016-05-09 09:08:38 +05:30
parent 54fb85855d
commit 1081b16a6c
1 changed files with 2 additions and 4 deletions
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6
src/calibre/utils/imageops/quantize.cpp
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@ -245,10 +245,8 @@ static void dither_image(const QImage &img, QImage &ans, QVector<QRgb> &color_ta
line = reinterpret_cast<const QRgb*>(img.constScanLine(r));
bits = ans.scanLine(r);
is_odd = r & 1;
start = is_odd ? iwidth - 1 : 0;
delta = is_odd ? -1 : 1;
line1 = is_odd ? &err2 : &err1;
line2 = is_odd ? &err1 : &err2;
if (is_odd) { start = iwidth - 1; delta = -1; line1 = &err2; line2 = &err1; }
else { start = 0; delta = 1; line1 = &err1; line2 = &err2; }
line2->fill(zero);
for (c = start; 0 < (is_odd ? c + 1 : iwidth - c); c += delta) {
pixel = *(line + c);