xshades.h

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/*----------------------------------------------------------------------
  File    : xshades.h
  Contents: X11 functions for color and grey shades allocation
  Author  : Christian Borgelt
  History : 07.01.2000 file created
            09.01.2000 color offset saved in structure
            30.01.2000 definition of SHD_MAXCNT added
----------------------------------------------------------------------*/
#ifndef __XSHADES__
#define __XSHADES__
#include <X11/Xlib.h>

/*----------------------------------------------------------------------
  Preprocessor Definitions
----------------------------------------------------------------------*/
#define SHD_BLACK     0         /* shade from black */
#define SHD_WHITE     1         /* shade from white */

#define SHD_MAXCNT  256         /* maximum number of shades */

/*----------------------------------------------------------------------
  Type Definitions
----------------------------------------------------------------------*/
typedef unsigned long PIXEL;    /* --- pixel -- */

typedef struct {                /* --- shades --- */
  Display  *disp;               /* display */
  Colormap colmap;              /* colormap */
  double   coloff;              /* color offset (in degrees) */
  int      colcnt;              /* number of colors */
  int      shdbase;             /* shade base (SHD_BLACK/SHD_WHITE) */
  int      shdcnt;              /* number of shades per color */
  PIXEL    *pixels[1];          /* pixel values of color shades */
} SHADES;                       /* (shades) */

/*----------------------------------------------------------------------
  Functions
----------------------------------------------------------------------*/
extern SHADES* shd_create  (Display *disp, Colormap colmap,
                            double coloff, int colcnt,
                            int shdbase,   int shdcnt);
extern void    shd_delete  (SHADES *shds);
extern double  shd_coloff  (SHADES *shds);
extern int     shd_colcnt  (SHADES *shds);
extern int     shd_shdbase (SHADES *shds);
extern int     shd_shdcnt  (SHADES *shds);
extern PIXEL   shd_pixel   (SHADES *shds, int color, int shade);
#ifndef NDEBUG
extern void    shd_show    (SHADES *shds);
#endif

/*----------------------------------------------------------------------
  Preprocessor Definitions
----------------------------------------------------------------------*/
#define shd_coloff(s)     ((s)->coloff)
#define shd_colcnt(s)     ((s)->colcnt)
#define shd_shdbase(s)    ((s)->shdbase)
#define shd_shdcnt(s)     ((s)->shdcnt)
#define shd_pixel(t,c,s)  ((t)->pixels[c][s])

#endif