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 v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.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