mi/mifillarc.h

   1 /************************************************************
   2
   3 Copyright 1989, 1998  The Open Group
   4
   5 Permission to use, copy, modify, distribute, and sell this software and its
   6 documentation for any purpose is hereby granted without fee, provided that
   7 the above copyright notice appear in all copies and that both that
   8 copyright notice and this permission notice appear in supporting
   9 documentation.
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  17 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20
  21 Except as contained in this notice, the name of The Open Group shall not be
  22 used in advertising or otherwise to promote the sale, use or other dealings
  23 in this Software without prior written authorization from The Open Group.
  24
  25 ********************************************************/
  26
  27 #ifndef __MIFILLARC_H__
  28 #define __MIFILLARC_H__
  29
  30 #define FULLCIRCLE (360 * 64)
  31
  32 typedef struct _miFillArc {
  33     int xorg, yorg;
  34     int y;
  35     int dx, dy;
  36     int e;
  37     int ym, yk, xm, xk;
  38 } miFillArcRec;
  39
  40 /* could use 64-bit integers */
  41 typedef struct _miFillArcD {
  42     int xorg, yorg;
  43     int y;
  44     int dx, dy;
  45     double e;
  46     double ym, yk, xm, xk;
  47 } miFillArcDRec;
  48
  49 #define miFillArcEmpty(arc) (!(arc)->angle2 || \
  50                              !(arc)->width || !(arc)->height || \
  51                              (((arc)->width == 1) && ((arc)->height & 1)))
  52
  53 #define miCanFillArc(arc) (((arc)->width == (arc)->height) || \
  54                            (((arc)->width <= 800) && ((arc)->height <= 800)))
  55
  56 #define MIFILLARCSETUP() \
  57     x = 0; \
  58     y = info.y; \
  59     e = info.e; \
  60     xk = info.xk; \
  61     xm = info.xm; \
  62     yk = info.yk; \
  63     ym = info.ym; \
  64     dx = info.dx; \
  65     dy = info.dy; \
  66     xorg = info.xorg; \
  67     yorg = info.yorg
  68
  69 #define MIFILLARCSTEP(slw) \
  70     e += yk; \
  71     while (e >= 0) \
  72     { \
  73         x++; \
  74         xk -= xm; \
  75         e += xk; \
  76     } \
  77     y--; \
  78     yk -= ym; \
  79     slw = (x << 1) + dx; \
  80     if ((e == xk) && (slw > 1)) \
  81         slw--
  82
  83 #define MIFILLCIRCSTEP(slw) MIFILLARCSTEP(slw)
  84 #define MIFILLELLSTEP(slw) MIFILLARCSTEP(slw)
  85
  86 #define miFillArcLower(slw) (((y + dy) != 0) && ((slw > 1) || (e != xk)))
  87
  88 typedef struct _miSliceEdge {
  89     int x;
  90     int stepx;
  91     int deltax;
  92     int e;
  93     int dy;
  94     int dx;
  95 } miSliceEdgeRec, *miSliceEdgePtr;
  96
  97 typedef struct _miArcSlice {
  98     miSliceEdgeRec edge1, edge2;
  99     int min_top_y, max_top_y;
 100     int min_bot_y, max_bot_y;
 101     Bool edge1_top, edge2_top;
 102     Bool flip_top, flip_bot;
 103 } miArcSliceRec;
 104
 105 #define MIARCSLICESTEP(edge) \
 106     edge.x -= edge.stepx; \
 107     edge.e -= edge.dx; \
 108     if (edge.e <= 0) \
 109     { \
 110         edge.x -= edge.deltax; \
 111         edge.e += edge.dy; \
 112     }
 113
 114 #define miFillSliceUpper(slice) \
 115                 ((y >= slice.min_top_y) && (y <= slice.max_top_y))
 116
 117 #define miFillSliceLower(slice) \
 118                 ((y >= slice.min_bot_y) && (y <= slice.max_bot_y))
 119
 120 #define MIARCSLICEUPPER(xl,xr,slice,slw) \
 121     xl = xorg - x; \
 122     xr = xl + slw - 1; \
 123     if (slice.edge1_top && (slice.edge1.x < xr)) \
 124         xr = slice.edge1.x; \
 125     if (slice.edge2_top && (slice.edge2.x > xl)) \
 126         xl = slice.edge2.x;
 127
 128 #define MIARCSLICELOWER(xl,xr,slice,slw) \
 129     xl = xorg - x; \
 130     xr = xl + slw - 1; \
 131     if (!slice.edge1_top && (slice.edge1.x > xl)) \
 132         xl = slice.edge1.x; \
 133     if (!slice.edge2_top && (slice.edge2.x < xr)) \
 134         xr = slice.edge2.x;
 135
 136 #define MIWIDEARCSETUP(x,y,dy,slw,e,xk,xm,yk,ym) \
 137     x = 0; \
 138     y = slw >> 1; \
 139     yk = y << 3; \
 140     xm = 8; \
 141     ym = 8; \
 142     if (dy) \
 143     { \
 144         xk = 0; \
 145         if (slw & 1) \
 146             e = -1; \
 147         else \
 148             e = -(y << 2) - 2; \
 149     } \
 150     else \
 151     { \
 152         y++; \
 153         yk += 4; \
 154         xk = -4; \
 155         if (slw & 1) \
 156             e = -(y << 2) - 3; \
 157         else \
 158             e = - (y << 3); \
 159     }
 160
 161 #define MIFILLINARCSTEP(slw) \
 162     ine += inyk; \
 163     while (ine >= 0) \
 164     { \
 165         inx++; \
 166         inxk -= inxm; \
 167         ine += inxk; \
 168     } \
 169     iny--; \
 170     inyk -= inym; \
 171     slw = (inx << 1) + dx; \
 172     if ((ine == inxk) && (slw > 1)) \
 173         slw--
 174
 175 #define miFillInArcLower(slw) (((iny + dy) != 0) && \
 176                                ((slw > 1) || (ine != inxk)))
 177
 178 #endif                          /* __MIFILLARC_H__ */