xorg-server-1.4/hw/xfree86/xf4bpp/mfbzerarc.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 /* GJA -- Took mfb code and modified it. */
  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_XORG_CONFIG_H
  36 #include <xorg-config.h>
  37 #endif
  38
  39 #include "xf4bpp.h"
  40 #include "OScompiler.h"
  41 #include "mfbmap.h"
  42 #include "mfb.h"
  43 #include "maskbits.h"
  44 #include "mi.h"
  45 #include "mizerarc.h"
  46 #include "wm3.h"
  47
  48 #include "xf86str.h" /* for pScrn->vtSema */
  49 extern ScrnInfoPtr *xf86Screens;
  50
  51 /*
  52  * Note, LEFTMOST must be the bit leftmost in the actual screen
  53  * representation.  This depends on both BITMAP_BIT_ORDER and
  54  * IMAGE_BYTE_ORDER
  55  * DHD 10/92
  56  */
  57
  58 #if (BITMAP_BIT_ORDER == MSBFirst)
  59 #if (IMAGE_BYTE_ORDER == MSBFirst)
  60 #define LEFTMOST        ((unsigned int) 0x80000000)
  61 #else
  62 #define LEFTMOST        ((unsigned int) 0x80)
  63 #endif
  64 #else
  65 #if (IMAGE_BYTE_ORDER == LSBFirst)
  66 #define LEFTMOST        ((unsigned int) 1)
  67 #else
  68 #define LEFTMOST        ((unsigned int) 0x1000000)
  69 #endif
  70 #endif
  71
  72 #define PixelateWhite(addr,off) \
  73 { \
  74     register int *tmpaddr = &((addr)[(off)>>PWSH]); \
  75     UPDRW(tmpaddr,SCRRIGHT (LEFTMOST, ((off) & PIM))); \
  76 }
  77 #define PixelateBlack(addr,off) \
  78 { \
  79     register int *tmpaddr = &((addr)[(off)>>PWSH]); \
  80     UPDRW(tmpaddr,~(SCRRIGHT (LEFTMOST, ((off) & PIM)))); \
  81 }
  82
  83 #define Pixelate(base,off) \
  84 { \
  85     paddr = base + ((off)>>PWSH); \
  86     pmask = SCRRIGHT(LEFTMOST, (off) & PIM); \
  87     UPDRW(paddr,(pixel & pmask)); \
  88 }
  89
  90 #define DoPix(bit,base,off) if (msk & bit) Pixelate(base,off);
  91
  92 static void
  93 v16ZeroArcSS
  94 (
  95     DrawablePtr pDraw,
  96     GCPtr pGC,
  97     xArc *arc
  98 )
  99 {
 100     miZeroArcRec info;
 101     Bool do360;
 102     register int x, y, a, b, d, msk;
 103     register int k1, k3, dx, dy;
 104     int *addrl;
 105     int *yorgl, *yorgol;
 106     unsigned long pixel;
 107     int nlwidth, yoffset, dyoffset;
 108     int pmask;
 109     register int *paddr;
 110
 111     if (((mfbPrivGC *)(pGC->devPrivates[mfbGetGCPrivateIndex()].ptr))->rop ==
 112         RROP_BLACK)
 113         pixel = 0;
 114     else
 115         pixel = ~0UL;
 116
 117     if (pDraw->type == DRAWABLE_WINDOW)
 118     {
 119         addrl = (int *)
 120                 (((PixmapPtr)(pDraw->pScreen->devPrivate))->devPrivate.ptr);
 121         nlwidth = (int)
 122                 (((PixmapPtr)(pDraw->pScreen->devPrivate))->devKind) >> 2;
 123     }
 124     else
 125     {
 126         addrl = (int *)(((PixmapPtr)pDraw)->devPrivate.ptr);
 127         nlwidth = (int)(((PixmapPtr)pDraw)->devKind) >> 2;
 128     }
 129
 130     do360 = miZeroArcSetup(arc, &info, TRUE);
 131     yorgl = addrl + ((info.yorg + pDraw->y) * nlwidth);
 132     yorgol = addrl + ((info.yorgo + pDraw->y) * nlwidth);
 133     info.xorg += pDraw->x;
 134     info.xorgo += pDraw->x;
 135     MIARCSETUP();
 136     yoffset = y ? nlwidth : 0;
 137     dyoffset = 0;
 138     msk = info.initialMask;
 139     if (!(arc->width & 1))
 140     {
 141         DoPix(2, yorgl, info.xorgo);
 142         DoPix(8, yorgol, info.xorgo);
 143     }
 144     if (!info.end.x || !info.end.y)
 145     {
 146         msk = info.end.mask;
 147         info.end = info.altend;
 148     }
 149     if (do360 && (arc->width == arc->height) && !(arc->width & 1))
 150     {
 151         int xoffset = nlwidth;
 152         int *yorghl = yorgl + (info.h * nlwidth);
 153         int xorghp = info.xorg + info.h;
 154         int xorghn = info.xorg - info.h;
 155
 156         while (1)
 157         {
 158             PixelateWhite(yorgl + yoffset, info.xorg + x);
 159             PixelateWhite(yorgl + yoffset, info.xorg - x);
 160             PixelateWhite(yorgol- yoffset, info.xorg - x);
 161             PixelateWhite(yorgol - yoffset, info.xorg + x);
 162             if (a < 0)
 163                 break;
 164             PixelateWhite(yorghl - xoffset, xorghp - y);
 165             PixelateWhite(yorghl - xoffset, xorghn + y);
 166             PixelateWhite(yorghl + xoffset, xorghn + y);
 167             PixelateWhite(yorghl + xoffset, xorghp - y);
 168             xoffset += nlwidth;
 169             MIARCCIRCLESTEP(yoffset += nlwidth;);
 170         }
 171         x = info.w;
 172         yoffset = info.h * nlwidth;
 173     }
 174     else if (do360)
 175     {
 176         while (y < info.h || x < info.w)
 177         {
 178             MIARCOCTANTSHIFT(dyoffset = nlwidth;);
 179             Pixelate(yorgl + yoffset, info.xorg + x);
 180             Pixelate(yorgl + yoffset, info.xorgo - x);
 181             Pixelate(yorgol - yoffset, info.xorgo - x);
 182             Pixelate(yorgol - yoffset, info.xorg + x);
 183             MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
 184         }
 185     }
 186     else
 187     {
 188         while (y < info.h || x < info.w)
 189         {
 190             MIARCOCTANTSHIFT(dyoffset = nlwidth;);
 191             if ((x == info.start.x) || (y == info.start.y))
 192             {
 193                 msk = info.start.mask;
 194                 info.start = info.altstart;
 195             }
 196             DoPix(1, yorgl + yoffset, info.xorg + x);
 197             DoPix(2, yorgl + yoffset, info.xorgo - x);
 198             DoPix(4, yorgol - yoffset, info.xorgo - x);
 199             DoPix(8, yorgol - yoffset, info.xorg + x);
 200             if ((x == info.end.x) || (y == info.end.y))
 201             {
 202                 msk = info.end.mask;
 203                 info.end = info.altend;
 204             }
 205             MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
 206         }
 207     }
 208     if ((x == info.start.x) || (y == info.start.y))
 209         msk = info.start.mask;
 210     DoPix(1, yorgl + yoffset, info.xorg + x);
 211     DoPix(4, yorgol - yoffset, info.xorgo - x);
 212     if (arc->height & 1)
 213     {
 214         DoPix(2, yorgl + yoffset, info.xorgo - x);
 215         DoPix(8, yorgol - yoffset, info.xorg + x);
 216     }
 217 }
 218
 219 static void
 220 xf4bppZeroPolyArcSS
 221 (
 222     DrawablePtr pDraw,
 223     GCPtr       pGC,
 224     int         narcs,
 225     xArc        *parcs
 226 )
 227 {
 228     register xArc *arc;
 229     register int i;
 230     BoxRec box;
 231     RegionPtr cclip;
 232
 233     if (!pGC->planemask & 0x0F)
 234         return;
 235     cclip = pGC->pCompositeClip;
 236     for (arc = parcs, i = narcs; --i >= 0; arc++)
 237     {
 238         if (miCanZeroArc(arc))
 239         {
 240             box.x1 = arc->x + pDraw->x;
 241             box.y1 = arc->y + pDraw->y;
 242             box.x2 = box.x1 + (int)arc->width + 1;
 243             box.y2 = box.y1 + (int)arc->height + 1;
 244             if (RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN)
 245                 v16ZeroArcSS(pDraw, pGC, arc);
 246             else
 247                 miZeroPolyArc(pDraw, pGC, 1, arc);
 248         }
 249         else
 250             miPolyArc(pDraw, pGC, 1, arc);
 251     }
 252 }
 253
 254 void
 255 xf4bppZeroPolyArc(pDraw, pGC, narcs, parcs)
 256     DrawablePtr pDraw;
 257     GCPtr       pGC;
 258     int         narcs;
 259     xArc        *parcs;
 260 {
 261     if ( !xf86Screens[pDraw->pScreen->myNum]->vtSema ) {
 262         miZeroPolyArc(pDraw, pGC, narcs, parcs);
 263     } else {
 264         DO_WM3(pGC,xf4bppZeroPolyArcSS(pDraw, pGC, narcs, parcs));
 265     }
 266 }