| 13 |
|
|
| 14 |
|
RGBPRIMS stdprims = STDPRIMS; /* standard primary chromaticities */ |
| 15 |
|
|
| 16 |
+ |
COLOR cblack = BLKCOLOR; /* global black color */ |
| 17 |
+ |
COLOR cwhite = WHTCOLOR; /* global white color */ |
| 18 |
+ |
|
| 19 |
|
/* |
| 20 |
|
* The following table contains the CIE tristimulus integrals |
| 21 |
|
* for X, Y, and Z. The table is cumulative, so that |
| 112 |
|
} |
| 113 |
|
|
| 114 |
|
|
| 115 |
< |
colortrans(c2, mat, c1, noneg) /* convert c1 by mat and put into c2 */ |
| 115 |
> |
cie_rgb(rgb, xyz) /* convert CIE color to standard RGB */ |
| 116 |
> |
COLOR rgb, xyz; |
| 117 |
> |
{ |
| 118 |
> |
colortrans(rgb, xyz2rgbmat, xyz); |
| 119 |
> |
clipgamut(rgb, xyz[CIEY], CGAMUT_LOWER, cblack, cwhite); |
| 120 |
> |
} |
| 121 |
> |
|
| 122 |
> |
|
| 123 |
> |
int |
| 124 |
> |
clipgamut(col, brt, gamut, lower, upper) /* clip to gamut cube */ |
| 125 |
> |
COLOR col; |
| 126 |
> |
double brt; |
| 127 |
> |
int gamut; |
| 128 |
> |
COLOR lower, upper; |
| 129 |
> |
{ |
| 130 |
> |
int rflags = 0; |
| 131 |
> |
double brtmin, brtmax, v, vv; |
| 132 |
> |
COLOR cgry; |
| 133 |
> |
register int i; |
| 134 |
> |
/* check for no check */ |
| 135 |
> |
if (gamut == 0) return(0); |
| 136 |
> |
/* check brightness limits */ |
| 137 |
> |
brtmin = 1./3.*(lower[0]+lower[1]+lower[2]); |
| 138 |
> |
if (gamut & CGAMUT_LOWER && brt < brtmin) { |
| 139 |
> |
copycolor(col, lower); |
| 140 |
> |
return(CGAMUT_LOWER); |
| 141 |
> |
} |
| 142 |
> |
brtmax = 1./3.*(upper[0]+upper[1]+upper[2]); |
| 143 |
> |
if (gamut & CGAMUT_UPPER && brt > brtmax) { |
| 144 |
> |
copycolor(col, upper); |
| 145 |
> |
return(CGAMUT_UPPER); |
| 146 |
> |
} |
| 147 |
> |
/* compute equivalent grey */ |
| 148 |
> |
v = (brt - brtmin)/(brtmax - brtmin); |
| 149 |
> |
for (i = 0; i < 3; i++) |
| 150 |
> |
cgry[i] = v*upper[i] + (1.-v)*lower[i]; |
| 151 |
> |
vv = 1.; /* check each limit */ |
| 152 |
> |
for (i = 0; i < 3; i++) |
| 153 |
> |
if (gamut & CGAMUT_LOWER && col[i] < lower[i]) { |
| 154 |
> |
v = (lower[i] - cgry[i])/(col[i] - cgry[i]); |
| 155 |
> |
if (v < vv) vv = v; |
| 156 |
> |
rflags |= CGAMUT_LOWER; |
| 157 |
> |
} else if (gamut & CGAMUT_UPPER && col[i] > upper[i]) { |
| 158 |
> |
v = (upper[i] - cgry[i])/(col[i] - cgry[i]); |
| 159 |
> |
if (v < vv) vv = v; |
| 160 |
> |
rflags |= CGAMUT_UPPER; |
| 161 |
> |
} |
| 162 |
> |
if (rflags) /* desaturate to cube face */ |
| 163 |
> |
for (i = 0; i < 3; i++) |
| 164 |
> |
col[i] = vv*col[i] + (1.-vv)*cgry[i]; |
| 165 |
> |
return(rflags); |
| 166 |
> |
} |
| 167 |
> |
|
| 168 |
> |
|
| 169 |
> |
colortrans(c2, mat, c1) /* convert c1 by mat and put into c2 */ |
| 170 |
|
register COLORMAT mat; |
| 171 |
|
register COLOR c1, c2; |
| 115 |
– |
int noneg; |
| 172 |
|
{ |
| 173 |
< |
static float cout[3]; |
| 174 |
< |
|
| 175 |
< |
cout[0] = mat[0][0]*c1[0] + mat[0][1]*c1[1] + mat[0][2]*c1[2]; |
| 120 |
< |
cout[1] = mat[1][0]*c1[0] + mat[1][1]*c1[1] + mat[1][2]*c1[2]; |
| 121 |
< |
cout[2] = mat[2][0]*c1[0] + mat[2][1]*c1[1] + mat[2][2]*c1[2]; |
| 122 |
< |
if (!noneg) |
| 123 |
< |
return; |
| 124 |
< |
if ((c2[0] = cout[0]) < 0.) c2[0] = 0.; |
| 125 |
< |
if ((c2[1] = cout[1]) < 0.) c2[1] = 0.; |
| 126 |
< |
if ((c2[2] = cout[2]) < 0.) c2[2] = 0.; |
| 173 |
> |
c2[0] = mat[0][0]*c1[0] + mat[0][1]*c1[1] + mat[0][2]*c1[2]; |
| 174 |
> |
c2[1] = mat[1][0]*c1[0] + mat[1][1]*c1[1] + mat[1][2]*c1[2]; |
| 175 |
> |
c2[2] = mat[2][0]*c1[0] + mat[2][1]*c1[1] + mat[2][2]*c1[2]; |
| 176 |
|
} |
| 177 |
|
|
| 178 |
|
|
