source: vbox/trunk/src/VBox/Additions/x11/x11include/xorg-server-1.7.7/mifillarc.h

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

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
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Except as contained in this notice, the name of The Open Group shall not be
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in this Software without prior written authorization from The Open Group.

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


#ifndef __MIFILLARC_H__
#define __MIFILLARC_H__

#define FULLCIRCLE (360 * 64)

typedef struct _miFillArc {
    int xorg, yorg;
    int y;
    int dx, dy;
    int e;
    int ym, yk, xm, xk;
} miFillArcRec;

/* could use 64-bit integers */
typedef struct _miFillArcD {
    int xorg, yorg;
    int y;
    int dx, dy;
    double e;
    double ym, yk, xm, xk;
} miFillArcDRec;

#define miFillArcEmpty(arc) (!(arc)->angle2 || \
                             !(arc)->width || !(arc)->height || \
                             (((arc)->width == 1) && ((arc)->height & 1)))

#define miCanFillArc(arc) (((arc)->width == (arc)->height) || \
                           (((arc)->width <= 800) && ((arc)->height <= 800)))

#define MIFILLARCSETUP() \
    x = 0; \
    y = info.y; \
    e = info.e; \
    xk = info.xk; \
    xm = info.xm; \
    yk = info.yk; \
    ym = info.ym; \
    dx = info.dx; \
    dy = info.dy; \
    xorg = info.xorg; \
    yorg = info.yorg

#define MIFILLARCSTEP(slw) \
    e += yk; \
    while (e >= 0) \
    { \
        x++; \
        xk -= xm; \
        e += xk; \
    } \
    y--; \
    yk -= ym; \
    slw = (x << 1) + dx; \
    if ((e == xk) && (slw > 1)) \
        slw--

#define MIFILLCIRCSTEP(slw) MIFILLARCSTEP(slw)
#define MIFILLELLSTEP(slw) MIFILLARCSTEP(slw)

#define miFillArcLower(slw) (((y + dy) != 0) && ((slw > 1) || (e != xk)))

typedef struct _miSliceEdge {
    int     x;
    int     stepx;
    int     deltax;
    int     e;
    int     dy;
    int     dx;
} miSliceEdgeRec, *miSliceEdgePtr;

typedef struct _miArcSlice {
    miSliceEdgeRec edge1, edge2;
    int min_top_y, max_top_y;
    int min_bot_y, max_bot_y;
    Bool edge1_top, edge2_top;
    Bool flip_top, flip_bot;
} miArcSliceRec;

#define MIARCSLICESTEP(edge) \
    edge.x -= edge.stepx; \
    edge.e -= edge.dx; \
    if (edge.e <= 0) \
    { \
        edge.x -= edge.deltax; \
        edge.e += edge.dy; \
    }

#define miFillSliceUpper(slice) \
                ((y >= slice.min_top_y) && (y <= slice.max_top_y))

#define miFillSliceLower(slice) \
                ((y >= slice.min_bot_y) && (y <= slice.max_bot_y))

#define MIARCSLICEUPPER(xl,xr,slice,slw) \
    xl = xorg - x; \
    xr = xl + slw - 1; \
    if (slice.edge1_top && (slice.edge1.x < xr)) \
        xr = slice.edge1.x; \
    if (slice.edge2_top && (slice.edge2.x > xl)) \
        xl = slice.edge2.x;

#define MIARCSLICELOWER(xl,xr,slice,slw) \
    xl = xorg - x; \
    xr = xl + slw - 1; \
    if (!slice.edge1_top && (slice.edge1.x > xl)) \
        xl = slice.edge1.x; \
    if (!slice.edge2_top && (slice.edge2.x < xr)) \
        xr = slice.edge2.x;

#define MIWIDEARCSETUP(x,y,dy,slw,e,xk,xm,yk,ym) \
    x = 0; \
    y = slw >> 1; \
    yk = y << 3; \
    xm = 8; \
    ym = 8; \
    if (dy) \
    { \
        xk = 0; \
        if (slw & 1) \
            e = -1; \
        else \
            e = -(y << 2) - 2; \
    } \
    else \
    { \
        y++; \
        yk += 4; \
        xk = -4; \
        if (slw & 1) \
            e = -(y << 2) - 3; \
        else \
            e = - (y << 3); \
    }

#define MIFILLINARCSTEP(slw) \
    ine += inyk; \
    while (ine >= 0) \
    { \
        inx++; \
        inxk -= inxm; \
        ine += inxk; \
    } \
    iny--; \
    inyk -= inym; \
    slw = (inx << 1) + dx; \
    if ((ine == inxk) && (slw > 1)) \
        slw--

#define miFillInArcLower(slw) (((iny + dy) != 0) && \
                               ((slw > 1) || (ine != inxk)))

extern _X_EXPORT void miFillArcSetup(
    xArc * /*arc*/,
    miFillArcRec * /*info*/
);

extern _X_EXPORT void miFillArcSliceSetup(
    xArc * /*arc*/,
    miArcSliceRec * /*slice*/,
    GCPtr /*pGC*/
);

#endif /* __MIFILLARC_H__ */