source: vbox/trunk/src/VBox/Additions/x11/x11include/xorg-server-1.8.0/mispans.h

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

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

#ifndef MISPANS_H
#define MISPANS_H

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 _X_EXPORT void miInitSpanGroup(
    SpanGroup * /*spanGroup*/
);

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

/* Paint a span group, insuring that each pixel is painted at most once */
extern _X_EXPORT 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 _X_EXPORT void miFreeSpanGroup(
    SpanGroup * /*spanGroup*/
);

extern _X_EXPORT 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))

#endif /* MISPANS_H */