> > > "...the filter adds up to 3 pixels to the left, and up to 3 pixels to > > the right." > > This is not a `padding' per se, but a necessity to make the color > filter work. The bytes are added around line 190 in file > `smooth/ftsmooth.c'.
Right. I see: width += 3 * extra; pitch = FT_PAD_CEIL( width, 4 ); where extra = 2 for FIR filters. So we add 3 *subpixels* on each side plus rounding. So on one hand, the docs say something different. On the other hand, the filter actually needs just 2 extra *subpixels* on each side.Brrrrr, something is not right.
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