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Lines Matching refs:reciprocal

1668          png_uint_32 reciprocal = 0;

1673          /* Calculate a reciprocal.  The correct calculation is simply

1675           * allows correct rounding by adding .5 before the shift.  'reciprocal'

1679             reciprocal = ((0xffff<<15)+(alpha>>1))/alpha;

1697              * component*reciprocal is less than 2^31.

1701                png_uint_32 calc = component * reciprocal;

1726  * Calculate an alpha reciprocal to reverse pre-multiplication.  As above the

1734    png_uint_32 reciprocal/*from the above macro*/)

1750     * component*reciprocal is less than 2^31.

1757        * be exact!)  [Could also test reciprocal != 0]

1761          component *= reciprocal;

1818             png_uint_32 reciprocal = 0;

1825                reciprocal = UNP_RECIPROCAL(alpha);

1829                *out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal);

1935             png_uint_32 reciprocal = 0;

1937             /* Calculate a reciprocal, as in the png_write_image_8bit code above

1942                reciprocal = (((0xffff*0xff)<<7)+(alpha>>1))/alpha;

1951                   alpha, reciprocal);

1953                   reciprocal);

1955                   reciprocal);

1960                   png_unpremultiply(entry[afirst], alpha, reciprocal);