color.h

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/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct hsvrgbacolor_t {
    char *name;
    unsigned char h, s, v;
    unsigned char r, g, b, a;
} hsvrgbacolor_t;
 
/* possible representations of color in gvcolor_t */
typedef enum { HSVA_DOUBLE, RGBA_BYTE, RGBA_WORD,
                RGBA_DOUBLE, COLOR_STRING, COLOR_INDEX } color_type_t;
 
/* gvcolor_t can hold a color spec in a choice or representations */
typedef struct color_s {
    union {
        double RGBA[4];
        double HSVA[4];
        unsigned char rgba[4];
        int rrggbbaa[4];
        char *string;
        int index;
    } u;
    color_type_t type;
} gvcolor_t;
 
#define COLOR_MALLOC_FAIL -1
#define COLOR_UNKNOWN 1
#define COLOR_OK 0
 
#ifdef __cplusplus
}
#endif