diff options
Diffstat (limited to 'libdimension/dimension/color.h')
| -rw-r--r-- | libdimension/dimension/color.h | 177 |
1 files changed, 13 insertions, 164 deletions
diff --git a/libdimension/dimension/color.h b/libdimension/dimension/color.h index adbd396..74bed59 100644 --- a/libdimension/dimension/color.h +++ b/libdimension/dimension/color.h @@ -1,5 +1,5 @@ /************************************************************************* - * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com> * + * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> * * * * This file is part of The Dimension Library. * * * @@ -20,174 +20,23 @@ /** * @file - * Colors. + * Color handling. */ -#include <stdbool.h> +#ifndef DMNSN_COLOR_H +#define DMNSN_COLOR_H -/** A color value. */ -typedef struct { - double R; /**< Red component. */ - double G; /**< Green component. */ - double B; /**< Blue component. */ -} dmnsn_color; +#ifdef __cplusplus +extern "C" { +#endif -/** A standard format string for colors. */ -#define DMNSN_COLOR_FORMAT "Color<%g, %g, %g>" -/** The appropriate arguements to printf() a color. */ -#define DMNSN_COLOR_PRINTF(c) (c).R, (c).G, (c).B +#include <dimension/math.h> -/** Construct a new color. */ -DMNSN_INLINE dmnsn_color -dmnsn_new_color(double R, double G, double B) -{ - dmnsn_color ret = { R, G, B }; - return ret; -} - -/** Apply sRGB gamma */ -DMNSN_INLINE double -dmnsn_sRGB_gamma(double Clinear) -{ - /* - * If C represents R, G, and B, then the sRGB values are now found as follows: - * - * { 12.92*Clinear, Clinear <= 0.0031308 - * Csrgb = { 1/2.4 - * { (1.055)*Clinear - 0.055, Clinear > 0.0031308 - */ - if (Clinear == 1.0) { - return 1.0; /* Map 1.0 to 1.0 instead of 0.9999999999999999 */ - } else if (Clinear > 0.0031308) { - return 1.055*pow(Clinear, 1.0/2.4) - 0.055; - } else { - return 12.92*Clinear; - } -} - -/** Convert to sRGB space. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_to_sRGB(dmnsn_color color) -{ - return dmnsn_new_color( - dmnsn_sRGB_gamma(color.R), - dmnsn_sRGB_gamma(color.G), - dmnsn_sRGB_gamma(color.B) - ); -} - -/** Remove sRGB gamma */ -DMNSN_INLINE double -dmnsn_sRGB_inverse_gamma(double CsRGB) -{ - /* - * If C represents R, G, and B, then the Clinear values are now found as - * follows: - * - * { Csrgb/12.92, Csrgb <= 0.04045 - * Clinear = { 2.4 - * { ((Csrgb + 0.055)/1.055) , Csrgb > 0.04045 - */ - if (CsRGB == 1.0) { - return 1.0; /* Map 1.0 to 1.0 instead of 0.9999999999999999 */ - } else if (CsRGB <= 0.040449936) { - return CsRGB/12.92; - } else { - return pow((CsRGB + 0.055)/1.055, 2.4); - } -} - -/** Convert from sRGB space. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_from_sRGB(dmnsn_color color) -{ - return dmnsn_new_color( - dmnsn_sRGB_inverse_gamma(color.R), - dmnsn_sRGB_inverse_gamma(color.G), - dmnsn_sRGB_inverse_gamma(color.B) - ); -} - -/** Greyscale color intensity. */ -DMNSN_INLINE double -dmnsn_color_intensity(dmnsn_color color) -{ - return 0.2126*color.R + 0.7152*color.G + 0.0722*color.B; -} - -/** Add two colors together. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_add(dmnsn_color lhs, dmnsn_color rhs) -{ - return dmnsn_new_color(lhs.R + rhs.R, lhs.G + rhs.G, lhs.B + rhs.B); -} - -/** Subtract two colors. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_sub(dmnsn_color lhs, dmnsn_color rhs) -{ - return dmnsn_new_color(lhs.R - rhs.R, lhs.G - rhs.G, lhs.B - rhs.B); -} - -/** Scale a color's intensity. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_mul(double n, dmnsn_color color) -{ - return dmnsn_new_color(n*color.R, n*color.G, n*color.B); -} - -/** Return the color at \p n on a gradient from \p c1 at 0 to \p c2 at 1. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_gradient(dmnsn_color c1, dmnsn_color c2, double n) -{ - return dmnsn_new_color( - n*(c2.R - c1.R) + c1.R, - n*(c2.G - c1.G) + c1.G, - n*(c2.B - c1.B) + c1.B - ); -} - -/** Illuminate \p color with \p light. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_illuminate(dmnsn_color light, dmnsn_color color) -{ - return dmnsn_new_color(light.R*color.R, light.G*color.G, light.B*color.B); -} +#include <dimension/color/color.h> +#include <dimension/color/tcolor.h> -/** Saturate the color components to [0.0, 1.0]. */ -DMNSN_INLINE dmnsn_color -dmnsn_color_clamp(dmnsn_color color) -{ - color.R = dmnsn_clamp(color.R, 0.0, 1.0); - color.G = dmnsn_clamp(color.G, 0.0, 1.0); - color.B = dmnsn_clamp(color.B, 0.0, 1.0); - return color; +#ifdef __cplusplus } +#endif -/** Return whether a color contains any NaN components. */ -DMNSN_INLINE bool -dmnsn_color_isnan(dmnsn_color color) -{ - return dmnsn_isnan(color.R) || dmnsn_isnan(color.G) || dmnsn_isnan(color.B); -} - -/* Standard colors */ - -/** Black. */ -#define dmnsn_black dmnsn_new_color(0.0, 0.0, 0.0) -/** White. */ -#define dmnsn_white dmnsn_new_color(1.0, 1.0, 1.0) -/** Red. */ -#define dmnsn_red dmnsn_new_color(1.0, 0.0, 0.0) -/** Green. */ -#define dmnsn_green dmnsn_new_color(0.0, 1.0, 0.0) -/** Blue. */ -#define dmnsn_blue dmnsn_new_color(0.0, 0.0, 1.0) -/** Magenta. */ -#define dmnsn_magenta dmnsn_new_color(1.0, 0.0, 1.0) -/** Orange. */ -#define dmnsn_orange dmnsn_new_color(1.0, 0.21404114048223255, 0.0) -/** Yellow. */ -#define dmnsn_yellow dmnsn_new_color(1.0, 1.0, 0.0) -/** Cyan. */ -#define dmnsn_cyan dmnsn_new_color(0.0, 1.0, 1.0) +#endif /* DMNSN_COLOR_H */ |