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color.h

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#ifndef __SP_COLOR_H__
#define __SP_COLOR_H__

/** \file
 * Colors.
 *
 * Author:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   bulia byak <buliabyak@users.sf.net>
 *   Jon A. Cruz <jon@joncruz.org>
 *
 * Copyright (C) 2001-2002 Lauris Kaplinski
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include <gdk/gdk.h>
#include <string>

/* Useful composition macros */

#define SP_RGBA32_R_U(v) (((v) >> 24) & 0xff)
#define SP_RGBA32_G_U(v) (((v) >> 16) & 0xff)
#define SP_RGBA32_B_U(v) (((v) >> 8) & 0xff)
#define SP_RGBA32_A_U(v) ((v) & 0xff)
#define SP_COLOR_U_TO_F(v) ((v) / 255.0)
#define SP_COLOR_F_TO_U(v) ((unsigned int) ((v) * 255. + .5))
#define SP_RGBA32_R_F(v) SP_COLOR_U_TO_F (SP_RGBA32_R_U (v))
#define SP_RGBA32_G_F(v) SP_COLOR_U_TO_F (SP_RGBA32_G_U (v))
#define SP_RGBA32_B_F(v) SP_COLOR_U_TO_F (SP_RGBA32_B_U (v))
#define SP_RGBA32_A_F(v) SP_COLOR_U_TO_F (SP_RGBA32_A_U (v))
#define SP_RGBA32_U_COMPOSE(r,g,b,a) ((((r) & 0xff) << 24) | (((g) & 0xff) << 16) | (((b) & 0xff) << 8) | ((a) & 0xff))
#define SP_RGBA32_F_COMPOSE(r,g,b,a) SP_RGBA32_U_COMPOSE (SP_COLOR_F_TO_U (r), SP_COLOR_F_TO_U (g), SP_COLOR_F_TO_U (b), SP_COLOR_F_TO_U (a))

struct SVGICCColor;

/**
 * An RGB color with optional icc-color part
 */
00041 struct SPColor {
    SPColor();
    SPColor( SPColor const& other );
    SPColor( float r, float g, float b );
    SPColor( guint32 value );
    virtual ~SPColor();

    SPColor& operator= (SPColor const& other);

    bool operator == ( SPColor const& other ) const;
    bool isClose( SPColor const& other, float epsilon ) const;

    void set( float r, float g, float b );
    void set( guint32 value );

    guint32 toRGBA32( gint alpha ) const;
    guint32 toRGBA32( gdouble alpha ) const;

    std::string toString() const;

    SVGICCColor* icc;
    union {
        float c[3];
    } v;
};

guint32 sp_color_get_rgba32_ualpha (const SPColor *color, guint32 alpha);
guint32 sp_color_get_rgba32_falpha (const SPColor *color, float alpha);

void sp_color_get_rgb_floatv (const SPColor *color, float *rgb);
void sp_color_get_cmyk_floatv (const SPColor *color, float *cmyk);

/* Plain mode helpers */

void sp_color_rgb_to_hsv_floatv (float *hsv, float r, float g, float b);
void sp_color_hsv_to_rgb_floatv (float *rgb, float h, float s, float v);

void sp_color_rgb_to_hsl_floatv (float *hsl, float r, float g, float b);
void sp_color_hsl_to_rgb_floatv (float *rgb, float h, float s, float l);

void sp_color_rgb_to_cmyk_floatv (float *cmyk, float r, float g, float b);
void sp_color_cmyk_to_rgb_floatv (float *rgb, float c, float m, float y, float k);


#endif


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