| 1 | /************************************************************
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| 2 |
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| 3 | Copyright 1989, 1998 The Open Group
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| 4 |
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| 5 | Permission to use, copy, modify, distribute, and sell this software and its
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| 6 | documentation for any purpose is hereby granted without fee, provided that
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| 7 | the above copyright notice appear in all copies and that both that
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| 8 | copyright notice and this permission notice appear in supporting
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| 9 | documentation.
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| 10 |
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| 11 | The above copyright notice and this permission notice shall be included in
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| 12 | all copies or substantial portions of the Software.
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| 13 |
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| 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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| 17 | OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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| 18 | AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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| 19 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 20 |
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| 21 | Except as contained in this notice, the name of The Open Group shall not be
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| 22 | used in advertising or otherwise to promote the sale, use or other dealings
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| 23 | in this Software without prior written authorization from The Open Group.
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| 24 |
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| 25 | ********************************************************/
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| 26 |
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| 27 |
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| 28 | typedef struct {
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| 29 | int x;
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| 30 | int y;
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| 31 | int mask;
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| 32 | } miZeroArcPtRec;
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| 33 |
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| 34 | typedef struct {
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| 35 | int x, y, k1, k3, a, b, d, dx, dy;
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| 36 | int alpha, beta;
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| 37 | int xorg, yorg;
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| 38 | int xorgo, yorgo;
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| 39 | int w, h;
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| 40 | int initialMask;
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| 41 | miZeroArcPtRec start, altstart, end, altend;
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| 42 | int firstx, firsty;
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| 43 | int startAngle, endAngle;
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| 44 | } miZeroArcRec;
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| 45 |
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| 46 | #define miCanZeroArc(arc) (((arc)->width == (arc)->height) || \
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| 47 | (((arc)->width <= 800) && ((arc)->height <= 800)))
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| 48 |
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| 49 | #define MIARCSETUP() \
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| 50 | x = info.x; \
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| 51 | y = info.y; \
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| 52 | k1 = info.k1; \
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| 53 | k3 = info.k3; \
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| 54 | a = info.a; \
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| 55 | b = info.b; \
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| 56 | d = info.d; \
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| 57 | dx = info.dx; \
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| 58 | dy = info.dy
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| 59 |
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| 60 | #define MIARCOCTANTSHIFT(clause) \
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| 61 | if (a < 0) \
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| 62 | { \
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| 63 | if (y == info.h) \
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| 64 | { \
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| 65 | d = -1; \
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| 66 | a = b = k1 = 0; \
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| 67 | } \
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| 68 | else \
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| 69 | { \
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| 70 | dx = (k1 << 1) - k3; \
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| 71 | k1 = dx - k1; \
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| 72 | k3 = -k3; \
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| 73 | b = b + a - (k1 >> 1); \
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| 74 | d = b + ((-a) >> 1) - d + (k3 >> 3); \
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| 75 | if (dx < 0) \
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| 76 | a = -((-dx) >> 1) - a; \
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| 77 | else \
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| 78 | a = (dx >> 1) - a; \
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| 79 | dx = 0; \
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| 80 | dy = 1; \
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| 81 | clause \
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| 82 | } \
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| 83 | }
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| 84 |
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| 85 | #define MIARCSTEP(move1,move2) \
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| 86 | b -= k1; \
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| 87 | if (d < 0) \
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| 88 | { \
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| 89 | x += dx; \
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| 90 | y += dy; \
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| 91 | a += k1; \
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| 92 | d += b; \
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| 93 | move1 \
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| 94 | } \
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| 95 | else \
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| 96 | { \
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| 97 | x++; \
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| 98 | y++; \
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| 99 | a += k3; \
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| 100 | d -= a; \
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| 101 | move2 \
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| 102 | }
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| 103 |
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| 104 | #define MIARCCIRCLESTEP(clause) \
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| 105 | b -= k1; \
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| 106 | x++; \
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| 107 | if (d < 0) \
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| 108 | { \
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| 109 | a += k1; \
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| 110 | d += b; \
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| 111 | } \
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| 112 | else \
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| 113 | { \
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| 114 | y++; \
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| 115 | a += k3; \
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| 116 | d -= a; \
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| 117 | clause \
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| 118 | }
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| 119 |
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| 120 | /* mizerarc.c */
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| 121 |
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| 122 | extern Bool miZeroArcSetup(
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| 123 | xArc * /*arc*/,
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| 124 | miZeroArcRec * /*info*/,
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| 125 | Bool /*ok360*/
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| 126 | );
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| 127 |
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| 128 | extern DDXPointPtr miZeroArcPts(
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| 129 | xArc * /*arc*/,
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| 130 | DDXPointPtr /*pts*/
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| 131 | );
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| 132 |
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