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Viewing changes to libvips/colour/Lab2LabQ.c

  • Committer: Package Import Robot
  • Author(s): Jay Berkenbilt
  • Date: 2014-03-29 12:29:29 UTC
  • mfrom: (1.1.21) (30.1.16 sid)
  • Revision ID: package-import@ubuntu.com-20140329122929-fvxnaann32ex0gzk
Tags: 7.38.5-2
http://bugs.debian.org/742872
Enable dh-autoreconf. (Closes: #742872)

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libvips/colour/Lab2LabQ.c
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static void
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vips_Lab2LabQ_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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        float *p = (float *) in[0];
 
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        float * restrict p = (float *) in[0];
 
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        VipsPel * restrict q = out; 
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        float fval;
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        int lsbs;
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                intv = 10.23 * p[0] + 0.5;      /* scale L up to 10 bits */
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                intv = VIPS_CLIP( 0, intv, 1023 );
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                lsbs = (intv & 0x3) << 6;       /* 00000011 -> 11000000 */
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                out[0] = (intv >> 2);           /* drop bot 2 bits and store */
 
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                q[0] = (intv >> 2);             /* drop bot 2 bits and store */
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                fval = 8.0 * p[1];              /* do a */
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                intv = VIPS_RINT( fval );
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                intv = VIPS_CLIP( -1024, intv, 1023 );
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                lsbs |= (intv & 0x7) << 3;      /* 00000111 -> 00111000 */
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                out[1] = (intv >> 3);           /* drop bot 3 bits & store */
 
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                q[1] = (intv >> 3);             /* drop bot 3 bits & store */
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                fval = 8.0 * p[2];              /* do b */
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                intv = VIPS_RINT( fval );
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                intv = VIPS_CLIP( -1024, intv, 1023 );
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                lsbs |= (intv & 0x7);
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                out[2] = (intv >> 3);
 
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                q[2] = (intv >> 3);
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                out[3] = lsbs;                /* store lsb band */
 
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                q[3] = lsbs;                    /* store lsb band */
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                p += 3;
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                out += 4;
 
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                q += 4;
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        }
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}
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