gtk/gdk/linux-fb/mispans.h

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/* $TOG: mispans.h /main/5 1998/02/09 14:48:48 kaleb $ */

typedef struct {
    int         count;		/* number of spans		    */
    GdkSpan* points;		/* pointer to list of start points  */
} 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, possibly with some overlap */
extern void miFillSpanGroup(GdkDrawable* pDraw, GdkGC* pGC,
                            SpanGroup *spanGroup);

/* Paint a span group, insuring that each pixel is painted at most once */
extern void miFillUniqueSpanGroup(GdkDrawable* pDraw, GdkGC* 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);

extern int miClipSpans(GdkRegion* prgnDst, GdkPoint* ppt,
                       int *pwidth, int nspans, GdkPoint* 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))