FreonLinux/system/tinyx/mi/mispans.h

/***********************************************************

Copyright 1989, 1998  The Open Group

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Copyright 1989 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

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******************************************************************/


typedef struct {
    int         count;		/* number of spans		    */
    DDXPointPtr points;		/* pointer to list of start points  */
    int         *widths;	/* pointer to list of widths	    */
} Spans;

typedef struct {
    int		size;		/* Total number of *Spans allocated	*/
    int		count;		/* Number of *Spans actually in group   */
    Spans       *group;		/* List of Spans			*/
    int		ymin, ymax;	/* Min, max y values encountered	*/
} SpanGroup;

/* Initialize SpanGroup.  MUST BE DONE before use. */
extern void miInitSpanGroup(
    SpanGroup * /*spanGroup*/
);

/* Add a Spans to a SpanGroup. The spans MUST BE in y-sorted order */
extern void miAppendSpans(
    SpanGroup * /*spanGroup*/,
    SpanGroup * /*otherGroup*/,
    Spans * /*spans*/
);

/* Paint a span group, insuring that each pixel is painted at most once */
extern void miFillUniqueSpanGroup(
    DrawablePtr /*pDraw*/,
    GCPtr /*pGC*/,
    SpanGroup * /*spanGroup*/
);

/* Free up data in a span group.  MUST BE DONE or you'll suffer memory leaks */
extern void miFreeSpanGroup(
    SpanGroup * /*spanGroup*/
);

extern void miSubtractSpans(
    SpanGroup * /*spanGroup*/,
    Spans * /*sub*/
);

extern void miDisposeSpanGroup(
    SpanGroup * /*spanGroup*/
);

/* Rops which must use span groups */
#define miSpansCarefulRop(rop)	(((rop) & 0xc) == 0x8 || ((rop) & 0x3) == 0x2)
#define miSpansEasyRop(rop)	(!miSpansCarefulRop(rop))