/*
 * tk3d.h --
 *
 *	Declarations of types and functions shared by the 3d border
 *	module.
 *
 * Copyright (c) 1996-1997 by Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) Id
 */

#ifndef _TK3D
#define _TK3D

#include <tkInt.h>

#ifdef BUILD_tk
# undef TCL_STORAGE_CLASS
# define TCL_STORAGE_CLASS DLLEXPORT
#endif

/*
 * One of the following data structures is allocated for each 3-D border
 * currently in use.  Structures of this type are indexed by
 * borderTable, so that a single structure can be shared for several
 * uses.
 */

typedef struct TkBorder {
    Screen *screen;		/* Screen on which the border will be used. */
    Visual *visual;		/* Visual for all windows and pixmaps using
				 * the border. */
    int depth;			/* Number of bits per pixel of drawables where
				 * the border will be used. */
    Colormap colormap;		/* Colormap out of which pixels are
				 * allocated. */
    int resourceRefCount;	/* Number of active uses of this color (each
				 * active use corresponds to a call to
				 * Tk_Alloc3DBorderFromObj or Tk_Get3DBorder).
				 * If this count is 0, then this structure
				 * is no longer valid and it isn't present
				 * in borderTable: it is being kept around
				 * only because there are objects referring
				 * to it.  The structure is freed when
				 * resourceRefCount and objRefCount are
				 * both 0. */
    int objRefCount;		/* The number of Tcl objects that reference
				 * this structure. */
    XColor *bgColorPtr;		/* Background color (intensity
				 * between lightColorPtr and
				 * darkColorPtr). */
    XColor *darkColorPtr;	/* Color for darker areas (must free when
				 * deleting structure). NULL means shadows
				 * haven't been allocated yet.*/
    XColor *lightColorPtr;	/* Color used for lighter areas of border
				 * (must free this when deleting structure).
				 * NULL means shadows haven't been allocated
				 * yet. */
    Pixmap shadow;		/* Stipple pattern to use for drawing
				 * shadows areas.  Used for displays with
				 * <= 64 colors or where colormap has filled
				 * up. */
    GC bgGC;			/* Used (if necessary) to draw areas in
				 * the background color. */
    GC darkGC;			/* Used to draw darker parts of the
				 * border. None means the shadow colors
				 * haven't been allocated yet.*/
    GC lightGC;			/* Used to draw lighter parts of
				 * the border. None means the shadow colors
				 * haven't been allocated yet. */
    Tcl_HashEntry *hashPtr;	/* Entry in borderTable (needed in
				 * order to delete structure). */
    struct TkBorder *nextPtr;	/* Points to the next TkBorder structure with
				 * the same color name.  Borders with the
				 * same name but different screens or
				 * colormaps are chained together off a
				 * single entry in borderTable. */
} TkBorder;


/*
 * Maximum intensity for a color:
 */

#define MAX_INTENSITY 65535

/*
 * Declarations for platform specific interfaces used by this module.
 */

EXTERN TkBorder *	TkpGetBorder _ANSI_ARGS_((void));
EXTERN void		TkpGetShadows _ANSI_ARGS_((TkBorder *borderPtr,
			    Tk_Window tkwin));
EXTERN void		TkpFreeBorder _ANSI_ARGS_((TkBorder *borderPtr));

# undef TCL_STORAGE_CLASS
# define TCL_STORAGE_CLASS DLLIMPORT

#endif /* _TK3D */
