xorg-server-1.4/fb/fbfillrect.c

   1 /*
   2  * Copyright © 1998 Keith Packard
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of Keith Packard not be used in
   9  * advertising or publicity pertaining to distribution of the software without
  10  * specific, written prior permission.  Keith Packard makes no
  11  * representations about the suitability of this software for any purpose.  It
  12  * is provided "as is" without express or implied warranty.
  13  *
  14  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  20  * PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 #ifdef HAVE_DIX_CONFIG_H
  24 #include <dix-config.h>
  25 #endif
  26
  27 #include "fb.h"
  28
  29 void
  30 fbPolyFillRect(DrawablePtr  pDrawable,
  31                GCPtr        pGC,
  32                int          nrect,
  33                xRectangle   *prect)
  34 {
  35     RegionPtr       pClip = fbGetCompositeClip(pGC);
  36     register BoxPtr pbox;
  37     BoxPtr          pextent;
  38     int             extentX1, extentX2, extentY1, extentY2;
  39     int             fullX1, fullX2, fullY1, fullY2;
  40     int             partX1, partX2, partY1, partY2;
  41     int             xorg, yorg;
  42     int             n;
  43
  44     xorg = pDrawable->x;
  45     yorg = pDrawable->y;
  46
  47     pextent = REGION_EXTENTS(pGC->pScreen, pClip);
  48     extentX1 = pextent->x1;
  49     extentY1 = pextent->y1;
  50     extentX2 = pextent->x2;
  51     extentY2 = pextent->y2;
  52     while (nrect--)
  53     {
  54         fullX1 = prect->x + xorg;
  55         fullY1 = prect->y + yorg;
  56         fullX2 = fullX1 + (int) prect->width;
  57         fullY2 = fullY1 + (int) prect->height;
  58         prect++;
  59
  60         if (fullX1 < extentX1)
  61             fullX1 = extentX1;
  62
  63         if (fullY1 < extentY1)
  64             fullY1 = extentY1;
  65
  66         if (fullX2 > extentX2)
  67             fullX2 = extentX2;
  68
  69         if (fullY2 > extentY2)
  70             fullY2 = extentY2;
  71
  72         if ((fullX1 >= fullX2) || (fullY1 >= fullY2))
  73             continue;
  74         n = REGION_NUM_RECTS (pClip);
  75         if (n == 1)
  76         {
  77             fbFill (pDrawable,
  78                     pGC,
  79                     fullX1, fullY1, fullX2-fullX1, fullY2-fullY1);
  80         }
  81         else
  82         {
  83             pbox = REGION_RECTS(pClip);
  84             /*
  85              * clip the rectangle to each box in the clip region
  86              * this is logically equivalent to calling Intersect()
  87              */
  88             while(n--)
  89             {
  90                 partX1 = pbox->x1;
  91                 if (partX1 < fullX1)
  92                     partX1 = fullX1;
  93                 partY1 = pbox->y1;
  94                 if (partY1 < fullY1)
  95                     partY1 = fullY1;
  96                 partX2 = pbox->x2;
  97                 if (partX2 > fullX2)
  98                     partX2 = fullX2;
  99                 partY2 = pbox->y2;
 100                 if (partY2 > fullY2)
 101                     partY2 = fullY2;
 102
 103                 pbox++;
 104
 105                 if (partX1 < partX2 && partY1 < partY2)
 106                     fbFill (pDrawable, pGC,
 107                             partX1, partY1,
 108                             partX2 - partX1, partY2 - partY1);
 109             }
 110         }
 111     }
 112 }