blkImage.cpp

   1 /*
   2  *  blkImage.cpp
   3  *  openc2e
   4  *
   5  *  Created by Alyssa Milburn on Tue May 25 2004.
   6  *  Copyright (c) 2004 Alyssa Milburn. All rights reserved.
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Lesser General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2 of the License, or (at your option) any later version.
  12  *
  13  *  This library is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  Lesser General Public License for more details.
  17  *
  18  */
  19
  20 #include "openc2e.h"
  21 #include "blkImage.h"
  22 #include <iostream>
  23
  24 void blkImage::readHeader(std::istream &in) {
  25         uint32 flags; uint16 width, height, spritecount;
  26         in.read((char *)&flags, 4); flags = swapEndianLong(flags);
  27         is_565 = (flags & 0x01);
  28         in.read((char *)&width, 2); width = swapEndianShort(width);
  29         in.read((char *)&height, 2); height = swapEndianShort(height);
  30         totalwidth = width * 128; totalheight = height * 128;
  31         in.read((char *)&spritecount, 2); m_numframes = swapEndianShort(spritecount);
  32
  33         assert(m_numframes == (unsigned int) (width * height));
  34
  35         widths = new uint16[m_numframes];
  36         heights = new uint16[m_numframes];
  37         offsets = new uint32[m_numframes];
  38
  39         for (unsigned int i = 0; i < m_numframes; i++) {
  40                 in.read((char *)&offsets[i], 4); offsets[i] = swapEndianLong(offsets[i]) + 4;
  41                 in.read((char *)&widths[i], 2); widths[i] = swapEndianShort(widths[i]); assert(widths[i] == 128);
  42                 in.read((char *)&heights[i], 2); heights[i] = swapEndianShort(heights[i]); assert(heights[i] == 128);
  43         }
  44 }
  45
  46 void blkImage::writeHeader(std::ostream &s) {
  47         unsigned int dw; unsigned short w;
  48
  49         dw = (is_565 ? 1 : 0);
  50         dw = swapEndianLong(dw); s.write((char *)&dw, 4);
  51         w = totalwidth / 128; assert((unsigned int)(w * 128) == totalwidth);
  52         w = swapEndianShort(w); s.write((char *)&w, 2);
  53         w = totalheight / 128; assert((unsigned int)(w * 128) == totalheight);
  54         w = swapEndianShort(w); s.write((char *)&w, 2);
  55         w = m_numframes; assert(m_numframes == (unsigned int) ((totalwidth / 128) * (totalheight / 128)));
  56         w = swapEndianShort(w); s.write((char *)&w, 2);
  57
  58         for (unsigned int i = 0; i < m_numframes; i++) {
  59                 dw = offsets[i] - 4;
  60                 dw = swapEndianLong(dw); s.write((char *)&dw, 4);
  61                 w = widths[i]; assert(w == 128);
  62                 w = swapEndianShort(w); s.write((char *)&w, 2);
  63                 w = heights[i]; assert(w == 128);
  64                 w = swapEndianShort(w); s.write((char *)&w, 2);
  65         }
  66 }
  67
  68 blkImage::blkImage(mmapifstream *in) {
  69         stream = in;
  70
  71         readHeader(*in);
  72
  73         buffers = new void *[m_numframes];
  74
  75         for (unsigned int i = 0; i < m_numframes; i++)
  76                 buffers[i] = in->map + offsets[i];
  77 }
  78
  79 blkImage::~blkImage() {
  80         delete[] widths;
  81         delete[] heights;
  82         delete[] buffers;
  83         delete[] offsets;
  84 }
  85
  86 /* vim: set noet: */