[ViewVC] Diff of: radiance/ray/src/common/ccolor.c

Comparing ray/src/common/ccolor.c (file contents):
Revision 3.6 by greg, Tue Jul 17 23:40:24 2012 UTC vs.
Revision 3.7 by greg, Thu Mar 26 15:57:19 2015 UTC

+#undef  C2
+#undef  bbsp
+#undef  bblm
-+
-+
+#define UV_NORMF        410.
-+
-+
+/* encode (x,y) chromaticity */
-+
+C_CHROMA
-+
+c_encodeChroma(C_COLOR *clr)
-+
+{
-+
+        double  df;
-+
+        int     ub, vb;
-+
-+
+        c_ccvt(clr, C_CSXY);
-+
+        df = UV_NORMF/(-2.*clr->cx + 12.*clr->cy + 3.);
-+
+        ub = 4.*clr->cx * df;
-+
+        if (ub < 0) ub = 0;
-+
+        else if (ub > 0xff) ub = 0xff;
-+
+        vb = 9.*clr->cy * df;
-+
+        if (vb < 0) vb = 0;
-+
+        else if (vb > 0xff) vb = 0xff;
-+
-+
+        return(vb<<8 | ub);
-+
+}
-+
-+
+/* decode (x,y) chromaticity */
-+
+void
-+
+c_decodeChroma(C_COLOR *cres, C_CHROMA ccode)
-+
+{
-+
+        double  up = ((ccode & 0xff) + .5)*(1./UV_NORMF);
-+
+        double  vp = ((ccode>>8 & 0xff) + .5)*(1./UV_NORMF);
-+
+        double  df = 1./(6.*up - 16.*vp + 12.);
-+
-+
+        cres->cx = 9.*up * df;
-+
+        cres->cy = 4.*vp * df;
-+
+        cres->flags = C_CDXY|C_CSXY;
-+
+}
-+
-+
+#undef  UV_NORMF

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