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Also forgot to sum errors during propagation
This commit is contained in:
Kovid Goyal 2016-05-09 09:04:49 +05:30
parent 2ba5bc419f
commit 54fb85855d
1 changed files with 4 additions and 4 deletions
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8
src/calibre/utils/imageops/quantize.cpp
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@ -213,9 +213,9 @@ public:
};
static inline void propagate_error(QVector<DoublePixel> &error_line, int c, unsigned char mult, DoublePixel &error) {
error_line[c].red = error.red * mult;
error_line[c].green = error.green * mult;
error_line[c].blue = error.blue * mult;
error_line[c].red += error.red * mult;
error_line[c].green += error.green * mult;
error_line[c].blue += error.blue * mult;
}
static inline QRgb apply_error(QRgb pixel, DoublePixel &error) {
@ -250,7 +250,7 @@ static void dither_image(const QImage &img, QImage &ans, QVector<QRgb> &color_ta
line1 = is_odd ? &err2 : &err1;
line2 = is_odd ? &err1 : &err2;
line2->fill(zero);
for (c = start; 0 < (is_odd ? c : iwidth - c); c += delta) {
for (c = start; 0 < (is_odd ? c + 1 : iwidth - c); c += delta) {
pixel = *(line + c);
new_pixel = apply_error(pixel, (*line1)[c]);
index = root.index_for_nearest_color(qRed(new_pixel), qGreen(new_pixel), qBlue(new_pixel), 0);