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

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
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

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


#ifndef __DRVFILLARC_H__
#define __DRVFILLARC_H__

#define FULLCIRCLE (360 * 64)

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

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

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

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

#define DRVFILLARCSETUP() \
    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 DRVFILLARCSTEP(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 DRVFILLCIRCSTEP(slw) DRVFILLARCSTEP(slw)
#define DRVFILLELLSTEP(slw) DRVFILLARCSTEP(slw)

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

typedef struct _drvSliceEdge {
    int	    x;
    int     stepx;
    int	    deltax;
    int	    e;
    int	    dy;
    int	    dx;
} drvSliceEdgeRec, *drvSliceEdgePtr;

typedef struct _drvArcSlice {
    drvSliceEdgeRec 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;
} drvArcSliceRec;

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

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

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

#define DRVARCSLICEUPPER(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 DRVARCSLICELOWER(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 DRVWIDEARCSETUP(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 DRVFILLINARCSTEP(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 drvFillInArcLower(slw) (((iny + dy) != 0) && \
			       ((slw > 1) || (ine != inxk)))

extern _X_EXPORT void drvFillArcSetup(
    xArc * /*arc*/,
    drvFillArcRec * /*info*/
);

extern _X_EXPORT void drvFillArcSliceSetup(
    xArc * /*arc*/,
    drvArcSliceRec * /*slice*/,
    DrvGCPtr /*pGC*/
);

#endif /* __DRVFILLARC_H__ */