xorg-server-1.4/afb/afbsetsp.c

   1 /* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
   2 /***********************************************************
   3
   4 Copyright (c) 1987  X Consortium
   5
   6 Permission is hereby granted, free of charge, to any person obtaining a copy
   7 of this software and associated documentation files (the "Software"), to deal
   8 in the Software without restriction, including without limitation the rights
   9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 copies of the Software, and to permit persons to whom the Software is
  11 furnished to do so, subject to the following conditions:
  12
  13 The above copyright notice and this permission notice shall be included in
  14 all copies or substantial portions of the Software.
  15
  16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  19 X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 Except as contained in this notice, the name of the X Consortium shall not be
  24 used in advertising or otherwise to promote the sale, use or other dealings
  25 in this Software without prior written authorization from the X Consortium.
  26
  27
  28 Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
  29
  30                         All Rights Reserved
  31
  32 Permission to use, copy, modify, and distribute this software and its
  33 documentation for any purpose and without fee is hereby granted,
  34 provided that the above copyright notice appear in all copies and that
  35 both that copyright notice and this permission notice appear in
  36 supporting documentation, and that the name of Digital not be
  37 used in advertising or publicity pertaining to distribution of the
  38 software without specific, written prior permission.
  39
  40 DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  41 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  42 DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  43 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  44 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  45 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  46 SOFTWARE.
  47
  48 ******************************************************************/
  49
  50 #ifdef HAVE_DIX_CONFIG_H
  51 #include <dix-config.h>
  52 #endif
  53
  54 #include <X11/X.h>
  55 #include <X11/Xmd.h>
  56
  57 #include "misc.h"
  58 #include "regionstr.h"
  59 #include "gcstruct.h"
  60 #include "windowstr.h"
  61 #include "pixmapstr.h"
  62 #include "scrnintstr.h"
  63
  64 #include "afb.h"
  65 #include "maskbits.h"
  66
  67 #include "servermd.h"
  68
  69
  70 /* afbSetScanline -- copies the bits from psrc to the drawable starting at
  71  * (xStart, y) and continuing to (xEnd, y).  xOrigin tells us where psrc
  72  * starts on the scanline. (I.e., if this scanline passes through multiple
  73  * boxes, we may not want to start grabbing bits at psrc but at some offset
  74  * further on.)
  75  */
  76 static void
  77 afbSetScanline(int y, int xOrigin, int xStart, int xEnd, PixelType *psrc,
  78                int alu, PixelType *pdstBase, int widthDst, int sizeDst,
  79                int depthDst, int sizeSrc)
  80 {
  81         int w;                                                  /* width of scanline in bits */
  82         register PixelType *pdst;       /* where to put the bits */
  83         register PixelType tmpSrc;      /* scratch buffer to collect bits in */
  84         int dstBit;                                             /* offset in bits from beginning of
  85                                                                                  * word */
  86         register int nstart;            /* number of bits from first partial */
  87         register int nend;                      /* " " last partial word */
  88         int offSrc;
  89         PixelType startmask, endmask;
  90         PixelType *savePsrc = psrc + ((xStart - xOrigin) >> PWSH);
  91         int nlMiddle, nl;
  92         int d;
  93
  94         for (d = 0; d < depthDst; d++) {
  95                 pdst = afbScanline(pdstBase, xStart, y, widthDst) + sizeDst * d;        /* @@@ NEXT PLANE @@@ */
  96                 psrc = savePsrc + sizeSrc * d;  /* @@@ NEXT PLANE @@@ */
  97                 offSrc = (xStart - xOrigin) & PIM;
  98                 w = xEnd - xStart;
  99                 dstBit = xStart & PIM;
 100
 101                 if (dstBit + w <= PPW) {
 102                         getandputrop(psrc, offSrc, dstBit, w, pdst, alu)
 103                 } else {
 104                         maskbits(xStart, w, startmask, endmask, nlMiddle);
 105                         if (startmask)
 106                                 nstart = PPW - dstBit;
 107                         else
 108                                 nstart = 0;
 109                         if (endmask)
 110                                 nend = xEnd & PIM;
 111                         else
 112                                 nend = 0;
 113                         if (startmask) {
 114                                 getandputrop(psrc, offSrc, dstBit, nstart, pdst, alu)
 115                                 pdst++;
 116                                 offSrc += nstart;
 117                                 if (offSrc > PLST) {
 118                                         psrc++;
 119                                         offSrc -= PPW;
 120                                 }
 121                         }
 122                         nl = nlMiddle;
 123                         while (nl--) {
 124                                 getbits(psrc, offSrc, PPW, tmpSrc);
 125                                 DoRop(*pdst, alu, tmpSrc, *pdst);
 126                                 pdst++;
 127                                 psrc++;
 128                         }
 129                         if (endmask) {
 130                                 getandputrop0(psrc, offSrc, nend, pdst, alu);
 131                         }
 132                 }
 133         }
 134 }
 135
 136 \f
 137
 138 /* SetSpans -- for each span copy pwidth[i] bits from psrc to pDrawable at
 139  * ppt[i] using the raster op from the GC.  If fSorted is TRUE, the scanlines
 140  * are in increasing Y order.
 141  * Source bit lines are server scanline padded so that they always begin
 142  * on a word boundary.
 143  */
 144 void
 145 afbSetSpans(pDrawable, pGC, pcharsrc, ppt, pwidth, nspans, fSorted)
 146         DrawablePtr pDrawable;
 147         GCPtr pGC;
 148         char *pcharsrc;
 149         register DDXPointPtr ppt;
 150         int *pwidth;
 151         int nspans;
 152         int fSorted;
 153 {
 154         PixelType *psrc = (PixelType *)pcharsrc;
 155         PixelType *pdstBase;                            /* start of dst bitmap */
 156         int widthDst;                                           /* width of bitmap in words */
 157         int sizeDst;
 158         int depthDst;
 159         int sizeSrc = 0;
 160         register BoxPtr pbox, pboxLast, pboxTest;
 161         register DDXPointPtr pptLast;
 162         int alu;
 163         RegionPtr prgnDst;
 164         int xStart, xEnd;
 165         int yMax;
 166
 167         alu = pGC->alu;
 168         prgnDst = pGC->pCompositeClip;
 169
 170         pptLast = ppt + nspans;
 171
 172         yMax = pDrawable->y + (int) pDrawable->height;
 173         afbGetPixelWidthSizeDepthAndPointer(pDrawable, widthDst, sizeDst, depthDst,
 174                                                                                                          pdstBase);
 175
 176         pbox =  REGION_RECTS(prgnDst);
 177         pboxLast = pbox + REGION_NUM_RECTS(prgnDst);
 178
 179         if(fSorted) {
 180         /* scan lines sorted in ascending order. Because they are sorted, we
 181          * don't have to check each scanline against each clip box.  We can be
 182          * sure that this scanline only has to be clipped to boxes at or after the
 183          * beginning of this y-band
 184          */
 185                 pboxTest = pbox;
 186                 while(ppt < pptLast) {
 187                         pbox = pboxTest;
 188                         if(ppt->y >= yMax)
 189                                 break;
 190                         while(pbox < pboxLast) {
 191                                 if(pbox->y1 > ppt->y) {
 192                                         /* scanline is before clip box */
 193                                         break;
 194                                 } else if(pbox->y2 <= ppt->y) {
 195                                         /* clip box is before scanline */
 196                                         pboxTest = ++pbox;
 197                                         continue;
 198                                 } else if(pbox->x1 > ppt->x + *pwidth)  {
 199                                         /* clip box is to right of scanline */
 200                                         break;
 201                                 } else if(pbox->x2 <= ppt->x) {
 202                                         /* scanline is to right of clip box */
 203                                         pbox++;
 204                                         continue;
 205                                 }
 206
 207                                 /* at least some of the scanline is in the current clip box */
 208                                 xStart = max(pbox->x1, ppt->x);
 209                                 xEnd = min(ppt->x + *pwidth, pbox->x2);
 210                                 sizeSrc = PixmapWidthInPadUnits(*pwidth, 1);
 211                                 afbSetScanline(ppt->y, ppt->x, xStart, xEnd, psrc, alu, pdstBase,
 212                                                                          widthDst, sizeDst, depthDst, sizeSrc);
 213                                 if(ppt->x + *pwidth <= pbox->x2) {
 214                                         /* End of the line, as it were */
 215                                         break;
 216                                 } else
 217                                         pbox++;
 218                         }
 219                         /* We've tried this line against every box; it must be outside them
 220                          * all.  move on to the next point */
 221                         ppt++;
 222                         psrc += sizeSrc * depthDst;
 223                         pwidth++;
 224                 }
 225         } else {
 226                 /* scan lines not sorted. We must clip each line against all the boxes */
 227                 while(ppt < pptLast) {
 228                         if(ppt->y >= 0 && ppt->y < yMax) {
 229                                 for(pbox = REGION_RECTS(prgnDst); pbox< pboxLast; pbox++) {
 230                                         if(pbox->y1 > ppt->y) {
 231                                                 /* rest of clip region is above this scanline,
 232                                                  * skip it */
 233                                                 break;
 234                                         }
 235                                         if(pbox->y2 <= ppt->y) {
 236                                                 /* clip box is below scanline */
 237                                                 pbox++;
 238                                                 break;
 239                                         }
 240                                         if(pbox->x1 <= ppt->x + *pwidth &&
 241                                            pbox->x2 > ppt->x) {
 242                                                 xStart = max(pbox->x1, ppt->x);
 243                                                 xEnd = min(pbox->x2, ppt->x + *pwidth);
 244                                                 sizeSrc = PixmapWidthInPadUnits(*pwidth, 1);
 245                                                 afbSetScanline(ppt->y, ppt->x, xStart, xEnd, psrc, alu,
 246                                                                                          pdstBase, widthDst, sizeDst, depthDst,
 247                                                                                          sizeSrc);
 248                                         }
 249
 250                                 }
 251                         }
 252                 psrc += sizeSrc * depthDst;
 253                 ppt++;
 254                 pwidth++;
 255                 }
 256         }
 257 }