d_fill.c

   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