2013/7/16 Luiz Henrique de Figueiredo <l...@impa.br> > At two places in FT_Outline_Decompose there is a division by 2 that > loses one bit of precision. A client walking manually through the > contours of a glyph and mapping the control points to floats by > dividing by 64 and then doing any required midpoint calculation for > conics will get different results than one calling > FT_Outline_Decompose. > > That is not very surprising, fixed-point and floating-point algorithms do not generate the exact same results in the general case :-)
> I was doing some tests generating outlines of fonts and come upon this > because the .eps I generated were slightly different but gave > apparently the same image. > > Is this loss of precision a problem or will it never be seen in an image? > > It's a slight loss of precision for the sake of performance. As pointed out by Werner, the actual outline coordinates are scaled by either 64 or 1024, depending on context, to ensure this is not noticeable. > _______________________________________________ > Freetype-devel mailing list > Freetype-devel@nongnu.org > https://lists.nongnu.org/mailman/listinfo/freetype-devel >
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