home *** CD-ROM | disk | FTP | other *** search
- /************************************************************
- Copyright 1989 by The Massachusetts Institute of Technology
-
- 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 MIT not be used in
- advertising or publicity pertaining to distribution of the
- software without specific prior written permission.
- M.I.T. makes no representation about the suitability of
- this software for any purpose. It is provided "as is"
- without any express or implied warranty.
-
- ********************************************************/
-
- /* $XConsortium: mifillarc.h,v 5.2 89/11/05 15:16:21 rws Exp $ */
-
- #define FULLCIRCLE (360 * 64)
-
- typedef struct _miFillArc {
- int xorg, yorg;
- int y;
- int dx, dy;
- int e, ex;
- int ym, yk, xm, xk;
- } miFillArcRec;
-
- #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)))
-
- extern void miFillArcSetup(), miFillArcSliceSetup();
-
- #define MIFILLARCSETUP() \
- x = 0; \
- y = info.y; \
- e = info.e; \
- ex = info.ex; \
- 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 MIFILLCIRCSTEP(slw) \
- e += (y << 3) - xk; \
- while (e >= 0) \
- { \
- x++; \
- e += (ex = -((x << 3) + xk)); \
- } \
- y--; \
- slw = (x << 1) + dx; \
- if ((e == ex) && (slw > 1)) \
- slw--
-
- #define MIFILLELLSTEP(slw) \
- e += (y * ym) - yk; \
- while (e >= 0) \
- { \
- x++; \
- e += (ex = -((x * xm) + xk)); \
- } \
- y--; \
- slw = (x << 1) + dx; \
- if ((e == ex) && (slw > 1)) \
- slw--
-
- #define miFillArcLower(slw) (((y + dy) != 0) && ((slw > 1) || (e != ex)))
-
- 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;
-