source: vbox/trunk/src/VBox/Additions/x11/x11include/xorg-server-1.16.0/mispans.h@ 99743

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Copyright 1989 by Digital Equipment Corporation, Maynard, Massachusetts.

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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 */
    );

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

#endif                          /* MISPANS_H */