xorg-server-1.4/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
  28 #ifndef __MIFILLARC_H__
  29 #define __MIFILLARC_H__
  30
  31 #define FULLCIRCLE (360 * 64)
  32
  33 typedef struct _miFillArc {
  34     int xorg, yorg;
  35     int y;
  36     int dx, dy;
  37     int e;
  38     int ym, yk, xm, xk;
  39 } miFillArcRec;
  40
  41 /* could use 64-bit integers */
  42 typedef struct _miFillArcD {
  43     int xorg, yorg;
  44     int y;
  45     int dx, dy;
  46     double e;
  47     double ym, yk, xm, xk;
  48 } miFillArcDRec;
  49
  50 #define miFillArcEmpty(arc) (!(arc)->angle2 || \
  51                              !(arc)->width || !(arc)->height || \
  52                              (((arc)->width == 1) && ((arc)->height & 1)))
  53
  54 #define miCanFillArc(arc) (((arc)->width == (arc)->height) || \
  55                            (((arc)->width <= 800) && ((arc)->height <= 800)))
  56
  57 #define MIFILLARCSETUP() \
  58     x = 0; \
  59     y = info.y; \
  60     e = info.e; \
  61     xk = info.xk; \
  62     xm = info.xm; \
  63     yk = info.yk; \
  64     ym = info.ym; \
  65     dx = info.dx; \
  66     dy = info.dy; \
  67     xorg = info.xorg; \
  68     yorg = info.yorg
  69
  70 #define MIFILLARCSTEP(slw) \
  71     e += yk; \
  72     while (e >= 0) \
  73     { \
  74         x++; \
  75         xk -= xm; \
  76         e += xk; \
  77     } \
  78     y--; \
  79     yk -= ym; \
  80     slw = (x << 1) + dx; \
  81     if ((e == xk) && (slw > 1)) \
  82         slw--
  83
  84 #define MIFILLCIRCSTEP(slw) MIFILLARCSTEP(slw)
  85 #define MIFILLELLSTEP(slw) MIFILLARCSTEP(slw)
  86
  87 #define miFillArcLower(slw) (((y + dy) != 0) && ((slw > 1) || (e != xk)))
  88
  89 typedef struct _miSliceEdge {
  90     int     x;
  91     int     stepx;
  92     int     deltax;
  93     int     e;
  94     int     dy;
  95     int     dx;
  96 } miSliceEdgeRec, *miSliceEdgePtr;
  97
  98 typedef struct _miArcSlice {
  99     miSliceEdgeRec edge1, edge2;
 100     int min_top_y, max_top_y;
 101     int min_bot_y, max_bot_y;
 102     Bool edge1_top, edge2_top;
 103     Bool flip_top, flip_bot;
 104 } miArcSliceRec;
 105
 106 #define MIARCSLICESTEP(edge) \
 107     edge.x -= edge.stepx; \
 108     edge.e -= edge.dx; \
 109     if (edge.e <= 0) \
 110     { \
 111         edge.x -= edge.deltax; \
 112         edge.e += edge.dy; \
 113     }
 114
 115 #define miFillSliceUpper(slice) \
 116                 ((y >= slice.min_top_y) && (y <= slice.max_top_y))
 117
 118 #define miFillSliceLower(slice) \
 119                 ((y >= slice.min_bot_y) && (y <= slice.max_bot_y))
 120
 121 #define MIARCSLICEUPPER(xl,xr,slice,slw) \
 122     xl = xorg - x; \
 123     xr = xl + slw - 1; \
 124     if (slice.edge1_top && (slice.edge1.x < xr)) \
 125         xr = slice.edge1.x; \
 126     if (slice.edge2_top && (slice.edge2.x > xl)) \
 127         xl = slice.edge2.x;
 128
 129 #define MIARCSLICELOWER(xl,xr,slice,slw) \
 130     xl = xorg - x; \
 131     xr = xl + slw - 1; \
 132     if (!slice.edge1_top && (slice.edge1.x > xl)) \
 133         xl = slice.edge1.x; \
 134     if (!slice.edge2_top && (slice.edge2.x < xr)) \
 135         xr = slice.edge2.x;
 136
 137 #define MIWIDEARCSETUP(x,y,dy,slw,e,xk,xm,yk,ym) \
 138     x = 0; \
 139     y = slw >> 1; \
 140     yk = y << 3; \
 141     xm = 8; \
 142     ym = 8; \
 143     if (dy) \
 144     { \
 145         xk = 0; \
 146         if (slw & 1) \
 147             e = -1; \
 148         else \
 149             e = -(y << 2) - 2; \
 150     } \
 151     else \
 152     { \
 153         y++; \
 154         yk += 4; \
 155         xk = -4; \
 156         if (slw & 1) \
 157             e = -(y << 2) - 3; \
 158         else \
 159             e = - (y << 3); \
 160     }
 161
 162 #define MIFILLINARCSTEP(slw) \
 163     ine += inyk; \
 164     while (ine >= 0) \
 165     { \
 166         inx++; \
 167         inxk -= inxm; \
 168         ine += inxk; \
 169     } \
 170     iny--; \
 171     inyk -= inym; \
 172     slw = (inx << 1) + dx; \
 173     if ((ine == inxk) && (slw > 1)) \
 174         slw--
 175
 176 #define miFillInArcLower(slw) (((iny + dy) != 0) && \
 177                                ((slw > 1) || (ine != inxk)))
 178
 179 extern void miFillArcSetup(
 180     xArc * /*arc*/,
 181     miFillArcRec * /*info*/
 182 );
 183
 184 extern void miFillArcSliceSetup(
 185     xArc * /*arc*/,
 186     miArcSliceRec * /*slice*/,
 187     GCPtr /*pGC*/
 188 );
 189
 190 #endif /* __MIFILLARC_H__ */