src/simple2x.c

   1 // VisualBoyAdvance - Nintendo Gameboy/GameboyAdvance (TM) emulator.
   2 // Copyright (C) 1999-2003 Forgotten
   3 // Copyright (C) 2004 Forgotten and the VBA development team
   4
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 2, or(at your option)
   8 // any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // 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 Foundation,
  17 // Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19 #include "System.h"
  20
  21 void Simple2x(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
  22               u8 *dstPtr, u32 dstPitch, int width, int height)
  23 {
  24   u8 *nextLine, *finish;
  25
  26   nextLine = dstPtr + dstPitch;
  27
  28   do {
  29     u32 *bP = (u32 *) srcPtr;
  30     u32 *dP = (u32 *) dstPtr;
  31     u32 *nL = (u32 *) nextLine;
  32     u32 currentPixel;
  33
  34     finish = (u8 *) bP + ((width+2) << 1);
  35     currentPixel = *bP++;
  36
  37     do {
  38 #ifdef WORDS_BIGENDIAN
  39       u32 color = currentPixel >> 16;
  40 #else
  41       u32 color = currentPixel & 0xffff;
  42 #endif
  43
  44       color = color | (color << 16);
  45
  46       *(dP) = color;
  47       *(nL) = color;
  48
  49 #ifdef WORDS_BIGENDIAN
  50       color = currentPixel & 0xffff;
  51 #else
  52       color = currentPixel >> 16;
  53 #endif
  54       color = color| (color << 16);
  55       *(dP + 1) = color;
  56       *(nL + 1) = color;
  57
  58       currentPixel = *bP++;
  59
  60       dP += 2;
  61       nL += 2;
  62     } while ((u8 *) bP < finish);
  63
  64     srcPtr += srcPitch;
  65     dstPtr += dstPitch << 1;
  66     nextLine += dstPitch << 1;
  67   }
  68   while (--height);
  69 }
  70
  71 void Simple2x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
  72                 u8 *dstPtr, u32 dstPitch, int width, int height)
  73 {
  74   u8 *nextLine, *finish;
  75
  76   nextLine = dstPtr + dstPitch;
  77
  78   do {
  79     u32 *bP = (u32 *) srcPtr;
  80     u32 *dP = (u32 *) dstPtr;
  81     u32 *nL = (u32 *) nextLine;
  82     u32 currentPixel;
  83
  84     finish = (u8 *) bP + ((width+1) << 2);
  85     currentPixel = *bP++;
  86
  87     do {
  88       u32 color = currentPixel;
  89
  90       *(dP) = color;
  91       *(dP+1) = color;
  92       *(nL) = color;
  93       *(nL + 1) = color;
  94
  95       currentPixel = *bP++;
  96
  97       dP += 2;
  98       nL += 2;
  99     } while ((u8 *) bP < finish);
 100
 101     srcPtr += srcPitch;
 102     dstPtr += dstPitch << 1;
 103     nextLine += dstPitch << 1;
 104   }
 105   while (--height);
 106 }