xorg-server-1.4/afb/afbzerarc.c

   1 /************************************************************
   2
   3 Copyright (c) 1989  X Consortium
   4
   5 Permission is hereby granted, free of charge, to any person obtaining a copy
   6 of this software and associated documentation files (the "Software"), to deal
   7 in the Software without restriction, including without limitation the rights
   8 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 copies of the Software, and to permit persons to whom the Software is
  10 furnished to do so, subject to the following conditions:
  11
  12 The above copyright notice and this permission notice shall be included in
  13 all copies or substantial portions of the Software.
  14
  15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  18 X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  19 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  20 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21
  22 Except as contained in this notice, the name of the X Consortium shall not be
  23 used in advertising or otherwise to promote the sale, use or other dealings
  24 in this Software without prior written authorization from the X Consortium.
  25
  26 ********************************************************/
  27
  28
  29 /* Derived from:
  30  * "Algorithm for drawing ellipses or hyperbolae with a digital plotter"
  31  * by M. L. V. Pitteway
  32  * The Computer Journal, November 1967, Volume 10, Number 3, pp. 282-289
  33  */
  34
  35 #ifdef HAVE_DIX_CONFIG_H
  36 #include <dix-config.h>
  37 #endif
  38
  39 #include <X11/X.h>
  40 #include <X11/Xprotostr.h>
  41 #include "regionstr.h"
  42 #include "gcstruct.h"
  43 #include "pixmapstr.h"
  44 #include "scrnintstr.h"
  45 #include "afb.h"
  46 #include "maskbits.h"
  47 #include "mizerarc.h"
  48 #include "mi.h"
  49
  50 /*
  51  * Note: LEFTMOST must be the bit leftmost in the actual screen
  52  * representation.  This depends also on the IMAGE_BYTE_ORDER.
  53  * LONG2CHARS() takes care of the re-ordering as required. (DHD)
  54  */
  55 #if (BITMAP_BIT_ORDER == MSBFirst)
  56 #define LEFTMOST                ((PixelType) LONG2CHARS((1 << PLST)))
  57 #else
  58 #define LEFTMOST                ((PixelType) LONG2CHARS(1))
  59 #endif
  60
  61 #define Pixelate(base,yoff,xoff) \
  62 { \
  63         paddr = afbScanlineOffset(base, (yoff) + ((xoff)>>PWSH)); \
  64         pmask = SCRRIGHT(LEFTMOST, (xoff) & PIM); \
  65         for (de = 0; de < depthDst; de++, paddr += sizeDst) /* @@@ NEXT PLANE @@@ */ \
  66                 switch (rrops[de]) { \
  67                         case RROP_BLACK: \
  68                                 *paddr &= ~pmask; \
  69                                 break; \
  70                         case RROP_WHITE: \
  71                                 *paddr |= pmask; \
  72                                 break; \
  73                         case RROP_INVERT: \
  74                                 *paddr ^= pmask; \
  75                                 break; \
  76                         case RROP_NOP: \
  77                                 break; \
  78                 } \
  79 }
  80
  81 #define DoPix(bit,base,yoff,xoff) if (mask & bit) Pixelate(base,yoff,xoff);
  82
  83 static void
  84 afbZeroArcSS(DrawablePtr pDraw, GCPtr pGC, xArc *arc)
  85 {
  86         miZeroArcRec info;
  87         Bool do360;
  88         register int de;
  89         register int x, y, a, b, d, mask;
  90         register int k1, k3, dx, dy;
  91         PixelType *addrl;
  92         PixelType *yorgl, *yorgol;
  93         int nlwidth, yoffset, dyoffset;
  94         int sizeDst, depthDst;
  95         PixelType pmask;
  96         register PixelType *paddr;
  97         register unsigned char *rrops;
  98
  99         rrops = ((afbPrivGC *)(pGC->devPrivates[afbGCPrivateIndex].ptr))->rrops;
 100
 101         afbGetPixelWidthSizeDepthAndPointer(pDraw, nlwidth, sizeDst, depthDst,
 102                                                                                                          addrl);
 103         do360 = miZeroArcSetup(arc, &info, TRUE);
 104         yorgl = addrl + ((info.yorg + pDraw->y) * nlwidth);
 105         yorgol = addrl + ((info.yorgo + pDraw->y) * nlwidth);
 106         info.xorg += pDraw->x;
 107         info.xorgo += pDraw->x;
 108         MIARCSETUP();
 109         yoffset = y ? nlwidth : 0;
 110         dyoffset = 0;
 111         mask = info.initialMask;
 112         if (!(arc->width & 1)) {
 113                 DoPix(2, yorgl, 0, info.xorgo);
 114                 DoPix(8, yorgol, 0, info.xorgo);
 115         }
 116         if (!info.end.x || !info.end.y) {
 117                 mask = info.end.mask;
 118                 info.end = info.altend;
 119         }
 120         if (do360 && (arc->width == arc->height) && !(arc->width & 1)) {
 121                 int xoffset = nlwidth;
 122                 PixelType *yorghl = afbScanlineDeltaNoBankSwitch(yorgl, info.h, nlwidth);
 123                 int xorghp = info.xorg + info.h;
 124                 int xorghn = info.xorg - info.h;
 125
 126                 while (1) {
 127                         Pixelate(yorgl, yoffset, info.xorg + x);
 128                         Pixelate(yorgl, yoffset, info.xorg - x);
 129                         Pixelate(yorgol, -yoffset, info.xorg - x);
 130                         Pixelate(yorgol, -yoffset, info.xorg + x);
 131                         if (a < 0)
 132                                 break;
 133                         Pixelate(yorghl, -xoffset, xorghp - y);
 134                         Pixelate(yorghl, -xoffset, xorghn + y);
 135                         Pixelate(yorghl, xoffset, xorghn + y);
 136                         Pixelate(yorghl, xoffset, xorghp - y);
 137                         xoffset += nlwidth;
 138                         MIARCCIRCLESTEP(yoffset += nlwidth;);
 139                 }
 140                 x = info.w;
 141                 yoffset = info.h * nlwidth;
 142         } else if (do360) {
 143                 while (y < info.h || x < info.w) {
 144                         MIARCOCTANTSHIFT(dyoffset = nlwidth;);
 145                         Pixelate(yorgl, yoffset, info.xorg + x);
 146                         Pixelate(yorgl, yoffset, info.xorgo - x);
 147                         Pixelate(yorgol, -yoffset, info.xorgo - x);
 148                         Pixelate(yorgol, -yoffset, info.xorg + x);
 149                         MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
 150                 }
 151         } else {
 152                 while (y < info.h || x < info.w) {
 153                         MIARCOCTANTSHIFT(dyoffset = nlwidth;);
 154                         if ((x == info.start.x) || (y == info.start.y)) {
 155                                 mask = info.start.mask;
 156                                 info.start = info.altstart;
 157                         }
 158                         DoPix(1, yorgl, yoffset, info.xorg + x);
 159                         DoPix(2, yorgl, yoffset, info.xorgo - x);
 160                         DoPix(4, yorgol, -yoffset, info.xorgo - x);
 161                         DoPix(8, yorgol, -yoffset, info.xorg + x);
 162                         if ((x == info.end.x) || (y == info.end.y)) {
 163                                 mask = info.end.mask;
 164                                 info.end = info.altend;
 165                         }
 166                         MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
 167                 }
 168         }
 169         if ((x == info.start.x) || (y == info.start.y))
 170                 mask = info.start.mask;
 171         DoPix(1, yorgl, yoffset, info.xorg + x);
 172         DoPix(4, yorgol, -yoffset, info.xorgo - x);
 173         if (arc->height & 1) {
 174                 DoPix(2, yorgl, yoffset, info.xorgo - x);
 175                 DoPix(8, yorgol, -yoffset, info.xorg + x);
 176         }
 177 }
 178
 179 void
 180 afbZeroPolyArcSS(DrawablePtr pDraw, GCPtr pGC, int narcs, xArc *parcs)
 181 {
 182         register xArc *arc;
 183         register int i;
 184         BoxRec box;
 185         RegionPtr cclip;
 186
 187         cclip = pGC->pCompositeClip;
 188         for (arc = parcs, i = narcs; --i >= 0; arc++) {
 189                 if (miCanZeroArc(arc)) {
 190                         box.x1 = arc->x + pDraw->x;
 191                         box.y1 = arc->y + pDraw->y;
 192                         box.x2 = box.x1 + (int)arc->width + 1;
 193                         box.y2 = box.y1 + (int)arc->height + 1;
 194                         if (RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN)
 195                                 afbZeroArcSS(pDraw, pGC, arc);
 196                         else
 197                                 miZeroPolyArc(pDraw, pGC, 1, arc);
 198                 } else
 199                         miPolyArc(pDraw, pGC, 1, arc);
 200         }
 201 }