mizerarc.h revision 05b261ec 
1/************************************************************
2
3Copyright 1989, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25********************************************************/
26
27
28typedef struct {
29    int x;
30    int y;
31    int mask;
32} miZeroArcPtRec;
33
34typedef struct {
35    int x, y, k1, k3, a, b, d, dx, dy;
36    int alpha, beta;
37    int xorg, yorg;
38    int xorgo, yorgo;
39    int w, h;
40    int initialMask;
41    miZeroArcPtRec start, altstart, end, altend;
42    int firstx, firsty;
43    int startAngle, endAngle;
44} miZeroArcRec;
45
46#define miCanZeroArc(arc) (((arc)->width == (arc)->height) || \
47			   (((arc)->width <= 800) && ((arc)->height <= 800)))
48
49#define MIARCSETUP() \
50    x = info.x; \
51    y = info.y; \
52    k1 = info.k1; \
53    k3 = info.k3; \
54    a = info.a; \
55    b = info.b; \
56    d = info.d; \
57    dx = info.dx; \
58    dy = info.dy
59
60#define MIARCOCTANTSHIFT(clause) \
61    if (a < 0) \
62    { \
63	if (y == info.h) \
64	{ \
65	    d = -1; \
66	    a = b = k1 = 0; \
67	} \
68	else \
69	{ \
70	    dx = (k1 << 1) - k3; \
71	    k1 = dx - k1; \
72	    k3 = -k3; \
73	    b = b + a - (k1 >> 1); \
74	    d = b + ((-a) >> 1) - d + (k3 >> 3); \
75	    if (dx < 0) \
76		a = -((-dx) >> 1) - a; \
77	    else \
78		a = (dx >> 1) - a; \
79	    dx = 0; \
80	    dy = 1; \
81	    clause \
82	} \
83    }
84
85#define MIARCSTEP(move1,move2) \
86    b -= k1; \
87    if (d < 0) \
88    { \
89	x += dx; \
90	y += dy; \
91	a += k1; \
92	d += b; \
93	move1 \
94    } \
95    else \
96    { \
97	x++; \
98	y++; \
99	a += k3; \
100	d -= a; \
101	move2 \
102    }
103
104#define MIARCCIRCLESTEP(clause) \
105    b -= k1; \
106    x++; \
107    if (d < 0) \
108    { \
109	a += k1; \
110	d += b; \
111    } \
112    else \
113    { \
114	y++; \
115	a += k3; \
116	d -= a; \
117	clause \
118    }
119
120/* mizerarc.c */
121
122extern Bool miZeroArcSetup(
123    xArc * /*arc*/,
124    miZeroArcRec * /*info*/,
125    Bool /*ok360*/
126);
127