source: vbox/trunk/src/VBox/Additions/x11/x11include/xorg-server-1.6.0/mispans.h@ 17448

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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
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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 int miClipSpans(
    RegionPtr /*prgnDst*/,
    DDXPointPtr /*ppt*/,
    int * /*pwidth*/,
    int /*nspans*/,
    DDXPointPtr /*pptNew*/,
    int * /*pwidthNew*/,
    int /*fSorted*/
);

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