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  1. /*
  2. Copyright (C) 1996-1997 Id Software, Inc.
  3.  
  4. This program is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU General Public License
  6. as published by the Free Software Foundation; either version 2
  7. of the License, or (at your option) any later version.
  8.  
  9. This program is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
  12.  
  13. See the GNU General Public License for more details.
  14.  
  15. You should have received a copy of the GNU General Public License
  16. along with this program; if not, write to the Free Software
  17. Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18.  
  19. */
  20. // d_clear: clears a specified rectangle to the specified color
  21.  
  22. #include "quakedef.h"
  23.  
  24.  
  25. /*
  26. ================
  27. D_FillRect
  28. ================
  29. */
  30. void D_FillRect (vrect_t *rect, int color)
  31. {
  32.         int                             rx, ry, rwidth, rheight;
  33.         unsigned char   *dest;
  34.         unsigned                *ldest;
  35.  
  36.         rx = rect->x;
  37.         ry = rect->y;
  38.         rwidth = rect->width;
  39.         rheight = rect->height;
  40.  
  41.         if (rx < 0)
  42.         {
  43.                 rwidth += rx;
  44.                 rx = 0;
  45.         }
  46.         if (ry < 0)
  47.         {
  48.                 rheight += ry;
  49.                 ry = 0;
  50.         }
  51.         if (rx+rwidth > vid.width)
  52.                 rwidth = vid.width - rx;
  53.         if (ry+rheight > vid.height)
  54.                 rheight = vid.height - rx;
  55.                
  56.         if (rwidth < 1 || rheight < 1)
  57.                 return;
  58.  
  59.         dest = ((byte *)vid.buffer + ry*vid.rowbytes + rx);
  60.  
  61.         if (((rwidth & 0x03) == 0) && (((long)dest & 0x03) == 0))
  62.         {
  63.         // faster aligned dword clear
  64.                 ldest = (unsigned *)dest;
  65.                 color += color << 16;
  66.  
  67.                 rwidth >>= 2;
  68.                 color += color << 8;
  69.  
  70.                 for (ry=0 ; ry<rheight ; ry++)
  71.                 {
  72.                         for (rx=0 ; rx<rwidth ; rx++)
  73.                                 ldest[rx] = color;
  74.                         ldest = (unsigned *)((byte*)ldest + vid.rowbytes);
  75.                 }
  76.         }
  77.         else
  78.         {
  79.         // slower byte-by-byte clear for unaligned cases
  80.                 for (ry=0 ; ry<rheight ; ry++)
  81.                 {
  82.                         for (rx=0 ; rx<rwidth ; rx++)
  83.                                 dest[rx] = color;
  84.                         dest += vid.rowbytes;
  85.                 }
  86.         }
  87. }
  88.  
  89.