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/*************************************************************************
* Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Colors with transparency information.
*/
/** A transparent color. */
typedef struct dmnsn_tcolor {
dmnsn_color c; /**< Color. */
double T; /**< Transparency. */
double F; /**< Proportion of filtered transparency. */
} dmnsn_tcolor;
/** A standard format string for colors. */
#define DMNSN_TCOLOR_FORMAT "TColor<%g, %g, %g, %g, %g>"
/** The appropriate arguements to printf() a color. */
#define DMNSN_TCOLOR_PRINTF(tc) (tc).c.R, (tc).c.G, (tc).c.B, (tc).T, (tc).F
/** Create a tcolor. */
DMNSN_INLINE dmnsn_tcolor
dmnsn_new_tcolor(dmnsn_color c, double T, double F)
{
dmnsn_tcolor ret = { c, T, F };
return ret;
}
/** Convert a dmnsn_color into a dmnsn_tcolor. */
#define DMNSN_TCOLOR(c) dmnsn_new_tcolor(c, 0.0, 0.0)
/** Create a tcolor with individually-specified components. */
DMNSN_INLINE dmnsn_tcolor
dmnsn_new_tcolor5(double R, double G, double B, double T, double F)
{
dmnsn_tcolor ret = { dmnsn_new_color(R, G, B), T, F };
return ret;
}
/** Return the color at \p n on a gradient from \p c1 at 0 to \p c2 at 1. */
DMNSN_INLINE dmnsn_tcolor
dmnsn_tcolor_gradient(dmnsn_tcolor c1, dmnsn_tcolor c2, double n)
{
return dmnsn_new_tcolor(
dmnsn_color_gradient(c1.c, c2.c, n),
n*(c2.T - c1.T) + c1.T,
n*(c2.F - c1.F) + c1.F
);
}
/** Filter \p light through \p filter. */
DMNSN_INLINE dmnsn_color
dmnsn_tcolor_filter(dmnsn_color light, dmnsn_tcolor filter)
{
dmnsn_color filtered =
dmnsn_color_mul(filter.T*filter.F, dmnsn_color_illuminate(light, filter.c));
dmnsn_color transmitted = dmnsn_color_mul(filter.T*(1.0 - filter.F), light);
return dmnsn_color_add(filtered, transmitted);
}
/** Remove the filtered component of a tcolor. */
DMNSN_INLINE dmnsn_tcolor
dmnsn_tcolor_remove_filter(dmnsn_tcolor tcolor)
{
double intensity = dmnsn_color_intensity(tcolor.c);
double newtrans = (1.0 - (1.0 - intensity)*tcolor.F)*tcolor.T;
if (1.0 - newtrans >= dmnsn_epsilon) {
tcolor.c = dmnsn_color_mul((1.0 - tcolor.T)/(1.0 - newtrans), tcolor.c);
}
tcolor.T = newtrans;
tcolor.F = 0.0;
return tcolor;
}
/** Saturate the tcolor components to [0.0, 1.0]. */
DMNSN_INLINE dmnsn_tcolor
dmnsn_tcolor_clamp(dmnsn_tcolor tcolor)
{
tcolor.c = dmnsn_color_clamp(tcolor.c);
tcolor.T = dmnsn_clamp(tcolor.T, 0.0, 1.0);
tcolor.F = dmnsn_clamp(tcolor.F, 0.0, 1.0);
return tcolor;
}
/** Return whether a tcolor contains any NaN components. */
DMNSN_INLINE bool
dmnsn_tcolor_isnan(dmnsn_tcolor tcolor)
{
return dmnsn_color_isnan(tcolor.c) || dmnsn_isnan(tcolor.T) || dmnsn_isnan(tcolor.F);
}
/* Standard tcolors */
/** Clear. */
#define dmnsn_clear dmnsn_new_tcolor5(0.0, 0.0, 0.0, 1.0, 0.0)
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